The Acronyms Guide edited by Erin Malone Chris Janson 1st edition
Publisher Acknowledgement: This is the first edition of this book. Please notify us of any acronyms we may have missed by submitting them via the form at www.ciena.com/acronymsguide. We will be happy to include them in further editions of “The Acronyms Guide”. For additional information on Ciena’s Carrier Ethernet or Optical Communications Certification programs please contact
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Table of Contents Numerics........................... 1 A........................................ 1 B........................................ 2 C........................................ 3 D........................................ 5 E........................................ 7 F........................................ 9 G...................................... 10 H...................................... 11 I........................................ 12 J....................................... 14 K...................................... 14 L....................................... 14 M..................................... 15 N...................................... 17 O..................................... 18 P...................................... 20 Q..................................... 22 R...................................... 22 S...................................... 23 T...................................... 26 U...................................... 28 V...................................... 29 W..................................... 29 X...................................... 30 Z...................................... 30
Acronym Guide
ADI
Numerics
ADM
Add/Drop Multiplexer
2F
Two-Fiber
ADP
10 GbE
10 Gigabit Ethernet
Actual Departure Potential; Automatic Data Processing
10 GFC
10 Gigabit Fibre Channel (Same as FC1200)
ADSL
Asymmetric Digital Subscriber Line
ADT
100G
100 Gigabits
Actual Departure Time; Automatic Data Transmission
16-QAM
16 (points) Quadrature Amplitude Modulation
AE
Automation Engine; Automation Environment
3D
Three Dimensional
AES
Advanced Encryption Standard; Application Environment Specific
AESA
ATM End System Address; ATM End Station Address
AFI
Authority and Format Identifier
AFM
APS Mode Mismatch Failure
AGC
Automatic Gain Control; Access Group Controller
AGGR
Aggregate
AID
Access Identifier; Application Identifier
AIM
Auto Image Management; Active Inventory Map
3G
3rd Generation
40G
40 Gigabits
4C
Consortium of Intel, IBM, Matsushita, and Toshiba
4F
Four-Fiber
5C
Consortium of Intel, Sony, Matsushita, Toshiba, and Hitachi
A
Asset Distribution Interface
A/D
Analog-to-Digital
AAL
ATM Adaptation Layer
AAL0
ATM Adaptation Layer Type 0
AIN
AAL1
Advanced Intelligent Network
ATM Adaptation Layer Type 1
AINI
AAL2
ATM Inter-Network Interface
ATM Adaptation Layer 2 Transport
AINS
AAL3/4
Automatic in Service State
ATM Adaptation Layer Type 3 and 4
AIR
AAL5
Additive Increase Rate
ATM Adaptation Layer 5
AIS
ABR
Alarm Indication Signal
Available Bit Rate
AISDP
ABT
Alarm Indication Signal Decay Period
Advanced BiCMOS Technology
AISIP
AC
Alternating Current; Administrative Complex; Atomic Clock
Alarm Indication Signal Integration Period
AIS-L
AC-3
Alarm Indication Signal - Line
Audio Coding Revision 3
AIS-P
ACAC
Alarm Indication Signal - Path
Actual Call Admission Control
AIS-S
ACEG
Alarm Indication Signal - Section
Alternating Current Equipment Ground
AIS-V
ACK
VT Alarm Indication Signal
Acknowledge
ALS
ACL
Active Control List; Access Control List
Automatic Laser Shutdown; Application Layer Service
ACO
Alarm Cutoff
AM
ACQ
Acquire
Amplitude Modulation; Application Manager
ACR
Allowed Cell Rate
AMF
APS Mode Mismatch Failure
ACS
Automatic Channel Shutdown; Alarm Correlation and Suppression
AMI
Access Method Interface; Alternate Mark Inversion
ACSE
Association Control Service Element
AMP
Amplifier; Amperes
ACSS
Automatic Channel Shutdown Suppression; Automatic Channel Shutdown State
AMS
Asset Management System; Agent Management System
ANSI
American National Standards Institute
ACT
Active
AO
Autonomous Output
ADC
Analog-to-Digital Converter; Add/Drop Coupler
AOD
Advertising on Demand
APC
Angled Physical Contact
1
APD
Avalanche PhotoDiode
AU-n
API
Application Program Interface
AUX
Auxiliary
APS
Automatic Protection Switching
AVC
Attribute Value Change
APSBF
Automatic Protection Switching Byte Failure
AWG
American Wire Gauge
AWGN
Additive White Gaussian Noise
APSCM
Automatic Protection Switching Channel Mismatch
APSMM
Automatic Protection Switching Mode Mismatch
ARC
Alarm Reporting Control
ARP
Address Resolution Protocol
ARPU
Average Revenue per Unit (or User)
AS
Autonomous System
ASAP
Administrative Unit n
B B/P
Backplane
B3ZS
Bipolar With 3-Zero Substitution
B6ZS
Bipolar With 6-Zero Substitution
B8ZS
Bipolar With 8-Zero Substitution
BA
Booster Amplifier
Alarm Severity Assignment Profile
BB
Broadband
ASCII
American Standard Code for Information Interchange
BBE
Background Block Error
BBER
Background Block Error Ratio
ASD
Access Security Device
BBE-RS
ASE
Amplified Spontaneous Emission; Application Service Element
Background Block Error Regenerator Section (an SDH regenerator section error)
ASI
Asynchronous Serial Interface; Asynchronous SCSI Interface
BC
Business Continuity; Broadcast
BCD
Binary-Coded Decimal
ASIC
Application-Specific Integrated Circuit
BCST
Broadcast
ASN.1
Abstract Syntax Notation One
B-DCS
ASP
Applications Service Provider; Average Selling Price
Broadband Digital Cross-connect System
BDFB
Battery Distribution Fuse Bay; Battery Distribution Fuse Board
ASYNC
Asynchronous
AT
Advanced Technology
AT&T
American Telephone and Telegraph Company
ATA
Advanced Technology Attachment
ATAF
ATM Test Access Function
ATAG
Autonomous Tag
BE
Block Error; Best Effort
BECN
Backward Explicit Congestion Notification
BELLCORE BELL Communications Research, Inc. BER
Bit Error Rate
BE-RS
Block Errors-Regenerative Section
BER-SD-P Path Signal Degrade BER
ATAGSEQ Autonomous Tag Sequence ATC
Alarm Traffic Controller
BER-SF-P Path Signal Failure BER
ATDMA
Asynchronous Time Division Multiple Access
BERT
Bit Error Rate Test
BFP
Back Facet Power; Basic Format Packet
A-TDMA
Advanced Time Division Multiple Access
BGP
Border Gateway Protocol
BGP4
Border Gateway Protocol, version 4
Asynchronous Transfer Mode
BICI
Broadband Inter-Carrier Interfaces; B-ISDN Inter-carrier Interface
BICSI
Building Industry Consulting Services International
BIOS
Basic Input/Output System
BIP
Bit Interleaved Parity; Breaker Interface Panel
B-ISDN
Broadband ISDN
ATM
ATM SAM ATM Service Access Multiplexer ATMVCL
ATM Virtual Channel Link
ATMVPL
ATM Virtual Path Link
ATTN
Attenuator
AU/AU-x
Administrative Unit
AUG
Administrative Unit Group
AUI
Autonomous Unit Interface
2
BIT
Built-In Test; Binary Digit
CA
Content Archived; Carrier Access
BITS
Building Integrated Timing System
CAB
Conformity Assessment Body
bits/sym
Bits per Symbol
CAC
BLSR
Bidirectional Line Switched Ring
Connection Admission Control; Call Admission Control
BML
Business Management Layer
CAD
Computer Aided Design
BNC
Bayonet Neill-Concelman British National Connector
CALA
Central America and Latin America
CAM
Content Addressable Memory
BOC
Bell Operating Company
BOD
Bandwidth on Demand
CANARIE Canadian Network for Advancement of Research
BOL
Beginning of Life
BOM
Bill of Materials
BONDING Bandwidth ON Demand Interoperability Group BOOTP
Bootstrap Protocol
BP
Backplane
BPI
Baseline Privacy Interface
BPI+
Baseline Privacy Interface Plus
B-PON
Broadband Passive Optical Network
BPP
Backplane Protocol
bps
bits per second
BPSR
Bidirectional Path Switched Ring
BPT
Band Pass-Through
BPV
BiPolar Violations
B-RAS
Broadband Remote Access Server
CAP
Competitive Access Provider
CAPEX
Capital Expenditure
CAS
Channel Associated Signaling
CATV
Community Antenna Television; Cable Television
CB, C/B
Circuit Breaker
CBDS
Connectionless Broadband Data Service
CBN
Common Bonding Network
CBR
Constant Bit Rate
CC
Cross Connection; Clear Channel; Calling Centers
CCAF
Call Control Agent Function, IN block
CCB
Configuration Control Board
CCC
Cross Connect Controller
CCC768
Cross Connect Fabric with 768x768 STS-1 capacity
BRI
Basic Rate Interface
BRM
Backward RM
CCCG
Cross Connection and Control Group
BSC
Board SC Connector
CCC-PC
CCC Processor Card
BSP
Board Support Package
CCDF
BSS
Business Support System
Complementary Cumulative Distribution Function
BT
British Telecom; Burst Tolerance
CCI
Content Control Information
Btag
Beginning Tag
CCITT
BTM
Bits Termination Circuit Pack
Consultative Committee on International Telegraphy and Telephony
BTO
Build Transfer Operate
BTS
Business Telecom Services
BTU/hr
British Thermal Unit per hour
BW
Bandwidth
BWDM
Band Wavelength Division Multiplexer
BYT
Total Byte Count
C C
Celsius; Critical
C/I
Carrier-to-Interface Ratio
C/N
Carrier-to-Noise Ratio
C2O
Cable to Optic
3
CCK
Complimentary Code Keying
CCW
Counterclockwise
CDE
Common Desktop Environment (UNIX)
CDMA
Code Division Multiple Access
CDP
Contracted Deadline Potential
CDR
Call Detail Recording; Clock and Data Recovery
CD-ROM
Compact Disc Read Only Memory
CDT
Connection Dropping Threshold
CDTS
Chromatic Dispersion Test Set
CDV
Cell Delay Variation
CDVT
Cell Delay Variation Tolerance
CD-WO
Compact Disc - Write One
CE
Consumer Electronics
CME
Compressed Multiplication Equipment
CEA
Consumer Electronics Association
CMF
CELP
Code Excited Linear Predictive
Channel Mismatch Failure; Client Management Frame
CER
Cell Error Ratio; Codeword Error Ration
CMIP
CES
Circuit Emulation Service
Common Management Information Protocol
CEV
Controlled Environmental Vault
CMIS
CFDM
Command Frequency Division Multiplexer
Common Management Information Services
CMISE
CFG
Configuration
Common Management Information Service Element
CFM
Cubic Feet per Minute
CMR
Cell Misinsertion Rate
CFU
Cooling Fan Unit
CMS
Call Management Server
CH
Channel
CMTS
Cable Modem Termination System
CHASEH
Environmentally Hardened Chassis
CHASYNC Chassis with Sync
CMU
Clock Multiplier Unit
C-n
Container C-11=1,544 Mb/s; C-12=2,048 Mb/s; C-2=6,312 Mb/s; C-3=34,368 Mb/s and 44,736 Mb/s; C-4=139,264 Mb/s
CI
Compact Intelligence; Craft Interface; Customer Interface; Certified Integrator
CID
Circuit Identification; Craft Interface Device
CNIPS
Core Network Integrated Planning System
CIF
Client Interface
CNIR
Carrier-to-Noise/Ingress Ratio
Common Internet File System
CNMP
Customer Network Management Portal
Client Interface Module
CNR
Carrier-to-Noise Ratio
Ciena Optical Transport System
CO
Central Office
CIT
Craft Interface Terminal; Craft Interface Tool
COAX
Coaxial Cable
COBRA
CL
Coupling Loss; Cleared
Copper and Optical Broadband Remote Access
CLASS
Custom Local Area Signalling Services
CODEC
Coder/Decoder
CLEC
Competitive Local Exchange Carrier
COE
Central Office Equipment
CLEI
Common Language Equipment Identifier
COFA
Change of Frame Alignment
COLD
Central Office Layout Design
Common Language Equipment Identifier
COLL
Collision Count
CLFI
Common Language Facility Identifier
CLI
Command Line Interface
CONS
CLIP
Calling Line Identification Presentation
CLIR
Calling Line Identification Restriction
CLLI
Common Language Location Identifier
CLNP
Connectionless Network Layer Protocol
CLNS
Connectionless Network Service
CLP
CIFS CIM CINOT
CLEITM
CLR CLTP cm
CONDTYPE Condition Type Connection Oriented Network Service
COO
Chief Operating Officer
COPS
Common Open Policy Services
CORBA
Common Object Request Broker Architecture
COS
Class of Service; Common Object Services; CORBA Object Services
Cell Loss Priority
CoS
Class of Service
Cell Loss Ratio
COT
Central Office Terminal
Connectionless Transport Protocol
COTS
Commercial off the Shelf
centimeter
CP
Circuit Pack; Control Processor; Connection Provisioner; Call Processing; Customer Premise
CPCI
Compact Peripheral Component Interconnect
CM
Control Module; Cable Modem
CM-CLI
Control Module Command Line Interface
4
CPD
Common Path Distortion
CTG
Cradle-To-Grave
CPE
Customer Premises Equipment; Customer Provided Equipment
CTN
Core Transmission Network
C-Plane
Control Plane
CTP
Connection Termination Point
CPLD
Complex Programmable Logic Device
CTS
Clear To Send
CPM
Cross-Phase Modulation
CTx Line
Client Transmit Line
CPRM
Content Protection for Recordable Media
CUG
Closed User Group
CV
Code Violation
CV-FE
Code violation - Far End
CPT
Channel Pass-Through
CPTTAG
Connection Termination Point Tag
CPU
Central Processing Unit
CR
Circuit Reliability; Carriage Return; Critical Alarm
CRC
Cyclic Redundancy Check
CRG
Circuit Restoration Group
CR-LDP
Constraint-based Routing Label Distribution Protocol
CRS
Cross Connect
CRT
Cathode Ray Tube
CRx Line
Client Receive Line
CS
Control Sub-span; Convergence Sublayer; CoreStream
CSA
Canadian Standards Association
CSC
Command Signal and Control
CSD
Core Switching Division
CSES
Consecutive Severely Errored Seconds
Csh
C Shell
CSH
Common Signal Header
CSI
Convergence Sublayer Indicator
CV-L
Code Violation - Line
CV-P
Code Violation - Path
CV-PFE
Code Violation - Path Far End
CV-S, CVS Code Violation - Section; Code Violation -- Seconds CW
Clockwise; Continuous Wave
D D&C
Drop and Continue
D/A
Digital-to-Analog
D/I
Drop and Insert
DAC
Digital to Analog Converter; Digital Addressable Controller
DACS
Digital Access and Cross-Connect System
DAD
Direct Access Device
DADM
Data Add/Drop Multiplexer
DARPA
Defense Advanced Research Projects Agency (US)
DAS
Direct Attached Storage
DATE
Duly Authorised Telecommunications Entity decibel
CSM
Core Switching Manager
C-SMF
Conventional Single Mode Fiber
dB
CSO
Composite Second Order
DB
Database
CSP
Customer Service Profile
DB-9
Data Bus 9 Pin Connector
CSR
Customer Service Representative
DBA
Database Administrator
CS-RZ
Carrier-Suppressed Return-to-Zero
dBc
Decibel referenced to the carrier
CST
Central Standard Time
dBm
Decibel reference to milliwatts
CSU
Channel Service Unit; Customer Service Unit
DBMS
Database Management System
CSV
Comma-Separated Value
DBPSK
Differential Binary Phase Shift Keying
CT
Critical
DBS
Direct Broadcast Satellite
CTAM
Cable & Telecommunications Association for Marketing
dBW
Decibels referenced to Watts
DC
Direct Current; Data Connection
CTB
Composite Triple Beat
CTC
Common Transmit Clock
CTD
Cell Transfer Delay
5
DCC
Data Communications Channel
DCE
Data Communications Equipment; Data Circuit Terminating Equipment
DCF
Dispersion-Compensating Fiber
DCG
Dispersion Compensation Grating
DCM
Dispersion Compensation Module
DCME
Digital Compressed Multiplication Equipment
DCMS
Digital Circuit Multiplication System
DCN
Data Communication Network
DMACS
Distributed Monitoring and Control System
DMB
Digital Multipoint Bridge; Document Maintenance Bulletin
DMC
Dual Modem Cards
DMH
Degraded Modem Hours Digital Multi-Meter Detailed Method of Procedure
DCOM
Distributed Component Object Model
DMM
DCP
Digital Communications Protocol; Device Control Protocol
DMOP DMS
Dispersion-managed Solution
DCS
Digital Cross-connect System; Digital Connection System
DMUX
[Optical] Demultiplexer
DCS 1800 Digital Cellular System, GSM variant at 1800 MHz DCU
Dial up Data Channel Unit
DNCS
Digital Network Control System
DNR
Do Not Revert
DNS
Domain Name Server; Domain Name System
DDI
Direct Dialing Inward
DOCSIS
DDS
Digital Data Storage; Digital Data Service; Digital Data System; Digital Data Stream
Data-Over-Cable Service Interface Specifications
DOD
Department of Defense
DE
Discard Eligible
DEC
Digital Electrical Carrier
DECT
Digital European Cordless Telephone/ Telecommunication
DEG
Degraded Signal
DEMUX
DOS
Disk Operating System
DoS
Denial of Service
DP
Distribution Point; Data Processing
DPDT
Double-Pole, Double-Throw
DPFI
Data Plane Fault Isolation
Demultiplexer
DPI
Digital Program Insertion; Dots Per Inch
DENI
Digital Entertainment Networking Initiative
DPR
Dedicated Protection Ring
DPRAM
Dual Port Random Access Memory
DENY
Transaction Denier
DPT
Dynamic Packet Transport
DFB
Distributed Feedback
DQ
Degraded Quality Level
DG
Disc Group
DQDB
Distributed Queue Dual Bus
DGD
Differential Group Delay
DQoS
Direct Memory Access
DHCP
Dynamic Host Configuration Protocol
DQPSK
DHWG
Digital Home Working Group
Differential Quadrature Phase Shift Keying
DID
Direct Inward Dialer
DiffServ
Differentiated Services
DIO
Digital Input/Output
DIP
Dual In-line Package (switch)
DIR
Direction
Div
Division
DLC
Digital Loop Carrier
DLCI
Data Link Connection Identifier
DLL
Dynamic Link Library; Data Lind Layer (driver); Downline Load
DLT
DR
Disaster Recovery
DRAM
Dynamic Random Access Memory
DRM
Digital Rights Management
DS
Digital Signal; Downstream
DS0
Digital Service, Level 0, 64kbps
DS1
Digital Service, Level 1, 1.544 Mb/s ;Digital Signal Level
DS3
Digital Signal Level 3 (T3 equivalent)
DSCP
Differentiated Service Code Point
DSCRDS
Discard Count
Digital Linear Tape Drives
DSF
Dispersion Shifted Fiber
DM
Degraded Minute; Dispersion Mitigation
DSI
Digital Speech Interpolation
DSL
DMA
Direct Memory Access
Digital Subscriber Line; Digital Subscriber Loop
6
DSLAM
Digital Subscriber Line Access Multiplexer
E1
European Equivalent of T1 (2.048 Mb/s signal speed)
DS-n
Digital Signal, level n
E2E
End To End
DSP
Digital Signal Processor
E2PROM
DSS
Direct Satellite Services
Electrically Erasable Programmable Read Only Memory
DSS2
Digital Subscriber Signaling 2
E3
DSTB
Digital Set-top Box
European data signal at a rate of 34.368 Mb/s
DSX
Digital Side Interface
EAI
Enterprise Application Integration
DS-x
Digital Signal where N denotes multiple of 51.84 Mb/s
DSX-1
Digital Signal Level 1 Cross Connect
EAL
Events, Alarms, and Logging
EAP
Extensible Authentication Protocol
EAS
Emergency Alert System
Digital Signal Level 3 Cross Connect
EB
Error Block; Eastbound
DT
Decision Technology; Direct Termination
Eb/No
Energy per Bit to Noise ratio
EC
DTCP
Digital Transmission Content Protection
Enhanced Capacity ; European Commission
DTE
Data Terminal Equipment
EC-1
DTH
Direct-to-Home, usually satellite television broadcasting
Electrical Carrier Level 1 (STS1 Equivalent)
ECC
Edge Card Control; Embedded Communications Channel
DSX-3
DTL
Designated Transit List
DTMF
Dual Tone Multiple Frequency
DTS
Dynamic Transport System
DTV
Digital Television
DUART
Dual Universal Asynchronous Receiver Transmitter
DUP
Data User Part
DUS
Don’t Use Synchronization
DV
Digital Video
DVB-ASI
Digital Video Broadcast Asynchronous Serial Interface
DVC
Dynamic Virtual Concatenation
DVD
Digital Versatile Disc
DVD+R
Recordable Digital Versatile Disc
Equipment Catalog Item
ECLR
Egress Cell Loss Ratio
ECn
Electrical Carrier, level n; 0=64 kb/s, 2=6,312 Mb/s, 3=44,736 Mb/s
ECN
Engineering Change Notice
ECO
Engineering Change Order
ECTRA
European Committee for Telecommunications Regulatory Affairs
ED
Equipment Degrade
EDF
Erbium-Doped Fiber
EDFA
Erbium-Doped Fiber Amplifier
EDI
Electronic Data Interchange
eDOCSIS Embedded Data-Over-Cable Service Interface Specifications
DVD+RW Rewritable Digital Versatile Disc DVI
ECI
Display Visual Interface
EEE
Electronic Equipment Enclosure
EEPROM
Electrically Erasable Programmable Read Only Memory
DVM
Digital Voltmeter
DVOW
Digital Voice Orderwire
EF
Equipment Failure
DVR
Digital Video Recorder
EF&I
Engineer, Furnish and Install
DW
Datawire
EFCI
Explicit Forward Congestion Indication
DWDM
Dense Wavelength Division Multiplexing
EFD
Event Forwarding Discriminator
DXC
Digital Cross-Connect
EFP
Equipment Fault Protection
DXI
Data Exchange Interface
EH
Environmentally Hardened
EIA
Electronic Industries Alliance; Electronic Industries Association
EID
Equipment Identifier
EIDE
Enhanced Integrated Drive Electronics
E E&M
Ear & Mouth
7
EII
European Information Infrastructure
EQPT
EIR
Excess Information Rate
ER
Extended Reach
EIRP
Effective Isotropic Radiated Power; Equivalent Isotropic Radiated Power
ERDI
Enhanced Remote Defect Indicator
EREI-P
EJB
Enterprise Java Beans
Enhanced Path Remote Error Indication
Errcde
ELAN
Emulated Local Area Network
Error Code
ES
ELR
Extra Long Reach
Errored Second
ESA
EDFA Saturation Algorithm; End System Address
Equipment
EM
Element Manager
EMBS
Egress Maximum Burst Size
ESCBND
ESCON Bundle
EMC
ElectroMagnetic Compatibility
ESCON
Enterprise Systems Connection
EMD
Extended Management Domain
ESCR
Egress Sustainable Cell Rate
EMEA
Europe, Middle East and Asia
ESD
Electrostatic Discharge
EMG
Extended Management Gateway
ESDS
Electrostatic Discharge Sensitive
EMI
Electromagnetic Interference
ESF
EML
Element Management Layer; Electro-Absorptive Modulated Laser
Extended Super Frame; Extended Superframe Format
ES-FE
Errored Seconds - Far End
EMP
Expiring Maintenance Process
ESI
End System Identifier
EMS
Element Management System
ES-IS
End System to Intermediate System
EMT
Expiring Maintenance Tool
ES-L
Errored Seconds - Line
eMTA
Embedded Multimedia Terminal Adapter
ES-LFE
Errored Second-Line Far End
ESMOP
EMX
ESCON MUX
Electronic Service Method of Procedure
ES-MS
END
Extended Management Domain
Errored Seconds at the Mulitplexor Section
ENE
End Network Element
ESN
Extended Subnetwork
ENUT
Enhanced Non-preemptable Unprotected Traffic
ES-P
Errored Seconds - Path
ES-PFE
EO
Equipment Order
Errored Seconds - Path Far End
ESR
EOC
Embedded Operations Channel
Errored Second Ratio
ES-RS
EoD
Everything on Demand
Errored Second Regenerator Section
ES-S
EOF
End of Frame
Errored Seconds - Section
EST
EOL
End of Life
Eastern Standard Time
ES-V
EOM
End of Message
Errored Second-Virtual Tributary (VT) Path; Errored Second-VT Path Far End
EoS
Ethernet over SONET/SDH
ESx
Errored Second Count
EOW
Engineered Orderwire; Express Orderwire
ET
End Terminal
Etag
EPA
Environmental Protection Agency
Ending Tag
ETH
EPCR
Egress Peak Cell Rate
10/100 Ethernet
ETHBND
EPD
Early Packet Discard
Ethernet Bundle
ETLMI
EPG
Equipment Protection Group
ESCON Trib Laser Manager Interface
ETR
EPL
Ethernet Private Line
External Timing Reference
ETSI
EPLD
Erasable Programmable Logic Device
European Telecommunications Standards Institute
E-PON
Ethernet Passive Optical Network
EU
European Union
EPR
Engineering Progress Report
EVC
Ethernet Virtual Circuit
EPROM
Erasable Programmable Read Only Memory
EVM
Error Vector Magnitude
EVPL
Ethernet Virtual Private Line
8
EVPLAN
Ethernet Virtual Private Local Area Network
EWO
Engineering Work Order
EXER-R
Exercise - Ring
EXER-S
Exercise - Span (SONET)
EXP EXZ
Experimental Excessive Zone
F F
Fahrenheit
F&I
Furnish and Install
FA, F/A
Fuse Alarm; Fault Alarm
FAB
Field Alert Bulletin
FAD
Functional Access Domain
FAF
Facility Failure
FAT
Factory Acceptance Test
FC
Failure Code; Failure Count; Fiber Channel; Fibre Channel
FC Switch Fibre Channel Switch
FDL
Facilities Data Link
FDM
Frequency Division Multiplexing; Fast Ethernet ; Frequency Division Modulation
FDMA
Frequency Division Multiple Access
FDP
Fiber Distribution Panel
FDRP
Frame Drop
FE
Far End; Fast Ethernet; Forward Error Correction
FEAC
Far End Alarm Channel
FEACT
Far-End Terminal Alarm Condition
FEALM
Far-End Alarm
FEB
Fast Ethernet Bridging
FEBE
Far End Block Error
FEC
Forward Error Correction; Forwarding Equivalence Class
FECN
Forward Explicit Congestion Notification
FECS
Forward Error Correction Seconds
FEDS
FICON Extended Storage over Distance
FC100
Fibre Channel 1 Gb/s
FC10000
Fibre Channel 10 Gb/s (same as 10GFC)
FEP
Front End Processor; Far End Protection
FC200
Fibre Channel 2 Gb/s
FEPLF
Far End Protection Line Failure
FC400
Fibre Channel 4 Gb/s
FEPM
Far End Performance Monitor
FCAPS
Fault, Configuration, Accounting, Performance (or Provisioning), Security management
FERF
Far End Receive Failure
FET
Field-Effect Transistor
FF
Fast Forward
FCC
Federal Communications Commission
FC-FE
Failure Count - Far End
FCIP
Fibre Channel over Internet Protocol
FC-L
Failure Count - Line
FC-LFE
Failure Count - Line Far End
FCM
Fan Control Module
FCP
Fibre Channel Protocol
FFA
First Field Application
FFP
Facility Fault Protection
FFT
Fast Fourier Transform
FIB
Forwarding Information Base
FIC
Frame Identification Code
FICON
Fiber Connection
FIL
Fiber in the Loop
FIT
Failure in Time
FC-P
Failure Count - Path
FC-PFE
Failure Count - Path Far End
FITB
Fiber in the Building
FCS
Frame Check Sequence; Fibre Channel Standard
FITL
Fiber in the Loop
FITR
Fiber in the Riser
Count of FCS-32 Error
FLAG
Fiber Link Around the Globe
FC-V
Failure Count - VT
FM
FC-VFE
Failure Count - VT Far End
FDD
Frequency Division Duplexed
Fan Module; Fault Management; Forwarding Module; Frequency Modulation
FDDI
Fiber Distributed Data Interface
FDF
Fiber Distributing Frame
FCS32
9
FMA
Failure Modes Analysis
FMECA
Failure Mode and Effects and Criticality Analyses
FMS
Fault Management System
FSB
FNCS
Foreign National Control System
FSO
Free Space Optical
FO
Fiber Optics
FS-P
Forced Switch - Protection
FOADM
Fixed Optical Add/Drop Multiplexer; Flexible Optical Add/Drop Multiplexer
FS-R
Forced Switch - Ring
FSS
FOB
Free On Board
Fixed Satellite Service
FS-S
FOC
Final Operating Configuration
Forced Switch - Span
FS-W
FOD
Free on Demand
Forced Switch - Working
FT
FOS
Follow on Satellite, Intelsat designation
France Telecom
FT1
FOSC
Fiber Optic Splice Course
Fractional T1
GT
FOTS
Fiber Optic Transmission System
Gain Transfer; Grating Temperature
FTA
FOW
Forward OrderWire
Fault Tree Analysis
FTAM
FP
Fabry-Perot (type of laser); Frame Pulse (NEC)
File Transfer and Access Management
FTC
Fabric and Timing Card
FTM
Fabric Timing Module
FPG
Facility Protection Group
FPGA
Field Programmable Gate Array
FPLMTS
Future Public Land Mobile Telecommunications Systems
FPM
Fan Power Module
FPP FPS
Field Service Bulletin
FTP
File Transfer Protocol
FTTB
Fiber to the Building; Fiber to the Business
FTTC
Fast Pattern Processor
Fibre to the Curb (Kerb), linked to VDSL in deployment
FTTD
Frames per Second
Fiber to the Desk
FTTH
FR
Frame Relay
Fiber to the Home
FTTP
FRAD
Frame Relay Access Device
Fiber to the Premise; Maintenance Channel Transparent Termination Point
FRC
Force
FTTx
Fiber to the [endpoint]
FRD
Functional Requirements Document; Feature Requirements Definition
FUNI
Frame-based User-Network Interface
FW
FREQ
Frequency
Firmware; Firewall
FWHM
FRF
Frame Relay Forum
Full Width at Half Maximum
FWM
FRF.12
Frame Relay Forum Implementation Agreement 12
Four-Wave Mixing
FXO
Foreign Exchange Office
FXS
Foreign Exchange Service
FRF.13
Frame Relay Forum Implementation Agreement 13
FRF.5
Frame Relay Forum Implementation Agreement 5
FRF.8.1
Frame Relay Forum Implementation Agreement 8.1
GA
General Availability
FRG
Fragment Count
Gb
Gigabit
FRM
Forward Resource Management; Frame Count
GB
Gigabyte
GbE
Gigabit Ethernet
FRMS
Dropped Frames
FRS
Frame Relay Service
GbE VFTP Gigabit Ethernet Virtual Facility Termination Point
FRU
Field Replacement Unit
GbE WAN Gigabit Ethernet Wide Area Network
FS
File System
GbE WIF
FSA
Field Service Application
FSAN
Full Services Access Network (consortium)
G G/T
Gain to System Noise Temperature Ratio
Gigabit Ethernet Wide Area Network Interface
GBIC
Gigabit Interface Converter
Gbit
Gigabit
10
Gbps, Gbits Gigabits per second Gbytes/s
Gigabytes per second
GC
Gateway Controller
GCAC
Generic Connection Admission Control
GCC0
General Communications Channel 0 (similar to SDH/SONET DCC)
GCIT
Graphical Craft Interface Terminal
GCM
General Control Module
GCRA
Generic Cell Rate Algorithm
GDMO
Guidelines for the Definition of Managed Objects
GE
Gigabit Ethernet; Greater than or equal to ; General Electric Corporation
GRTES
General Requirements for Transmission Equipment Specification
GSM
Global System for Mobile communications, originally: Groupe Spéciale Mobile
GSO
Geostationary Earth Orbit
GT
Gain Transfer; Grating Temperature
GTF
Global Traffic Forecast (Intelsat)
GTM
Global Traffic Meeting (Intelsat)
GTP
Group Termination Point
GTS
General TeleSystems Group
GUI
Graphical User Interface
GW
Gateway
GWC
Gateway Controller
GEB
Gigabit Ethernet Bridge
GEO
Geostationary Earth Orbit
GESS
General Electric Satellite Services
GET
Gigabit Ethernet Tunneling
GFA
Gain Flattened Amplifier
GFC
Generic Flow Control
HD
High Definition
GFF
Gain Flattening Filter (used in EDFA)
HDB3
High Density Bipolar 3
GFP
Generic Framing Procedure
HDCP
GFR
Guaranteed Frame Rate
High-bandwidth Digital Content Protection
GHz
Gigahertz (Billion hertz)
HDLC
High-speed/level Data Link Control
GigE
H
Gigabit Ethernet
HA
High Availability
HCSFI
High-speed Central Switch Fabric Interface
HDMI
High Definition Multimedia Interface High Definition Serial Digital Interface
GII
Global Information Infrastructure
HD-SDI
GMDSS
Global Maritime Distress and Safety System
HDSF
High-speed Distributed Switch Fabric
HDSL
High-speed Digital Subscriber Line
Generalized Multi-Protocol Label Switching
HDT
Host Digital Terminal
HDTV
Greenwich Mean Time; Grasshoppers Made for Telecommunications (GMT fuses)
High Definition Television
HE
Headend
HEC
Header Error Control; Headend Controller
HEM
Headend Modem
HEPA
High Efficiency Particulate Arrester
HFC
Hybrid Fiber Coax
HFM
High-speed Forwarding Module
HGW
Home Gateway
HHP
Households Passed
HI
Hardware/Software Interface; Hardware-Software Integration; High Speed Internet High Speed Serial Application Specific Integrated Circuit (ASIC)
GMPLS GMT
GN
Gateway Network Element
GND
Ground
GNE
Gateway Network Element
GOS
Grade of Service
GP
Gateway Platform
GPI
General Purpose Input
GPIN
General Purpose Input
GPO
General Purpose Output
G-PON
Gigabit Passive Optical Network
GPS
Global Positioning System; Global Positioning Satellite
HISSA
GR
Generic Requirement; Geographic Redundancy
HMS
Hybrid Management Sub-layer
HNv1
Home Networking Version 1
GRDM
Gigabit Rate Data Multiplexer
11
HO
Higher Order
ICB
Independent Customer Builds
HOD
HBO on Demand
ICD
International Code Designator
HO-DSP
High Order-Domain Specific Part
ICLR
Ingress Cell Loss Ratio
HO-DXC
Higher Order Digital Cross Connect
ICMP
Internet Control Message Protocol
HOM
High-Order Modulation
ICNV
Input- Command Not Valid
HomePNA Home Phoneline Networking Alliance
ICP
IMA Control Protocol
HOP
High Order Path
ICPT
Installed Circuit Pack Type
HO-POH
Higher Order - Path Overhead
ICR
Initial Cell Rate
HOVC
Higher Order Virtual Concatenation
ID
Identifier; Identification
HP
Hairpin; Higher Order Path; Homes Passed
IDB
International Development Bank
IDE
HPA
High Power Amplifier
Integrated Device Electronics
IDF
HPF
High Pass Filter
Intermediate Distribution Frame; Invalid Data Flag
HPNA
Home Phoneline Networking Alliance
IDH
Identification High byte
HPOV
Hewlett Packard Open View
IDI
Initial Domain Identifier
HPPI
High Performance Parallel Interface
IDL
HP-UX
Hewlett Packard’s UNIX-based OS that runs on HP’s enterprise servers
Interactive Distance Learning; Interface Definition Language
IDNV
Input, Data Not Valid
HRD
Hardware Release Document; Hardware Requirements Document
IDP
Initial Domain Part
IDR
HS
High Speed
Intermediate Data Rate
IDS
HSB
High Speed Bus
Intrusion Detection System
IDT
HSD
High Speed Data
Inter-DXC Trunk
IDU
HSSI
High Speed Serial Interface
Indoor Unit
IE
HT
High Threshold
Information Element
IEC
HTML
Hyper Text Markup Language
Incoming Error Count; InterExchange Carrier
HTTP
Hypertext Transfer Protocol
IEEE
HVAC
Heating, Ventilation, and Air-Conditioning
Institute for Electrical and Electronics Engineers
IETF
Internet Engineering Task Force
HVS
Hospitality Voice Services
IF
Intermediate Frequency
HW
Hardware
IFC
Initial First Cost
Hz
Hertz
IG
Information Group
IGMP
Internet Group Multicast Protocol
IIAC
Input - Invalid Access Identifier
I I/B
Inbound/Outroute (also known as the return link), from remote terminal to hub
IIOP
CORBA Internet Inter-ORB Protocol
IISP
Interim Interface Signaling Protocol
ILA
Intermediate Light Amplification; Integrated Line Amplifier; In-Line Amplifier
I/O
Input/Output
IAD
Integrated Access Device; Interface Access Device
ILEC
IAS
Internet Access Service; Internet Authentication Service
Incumbent Local Exchange Carrier
ILM
IBCC
In-Band Communication Channel
Integrated Laser Module; Integrated Laser Modulator
ILMI
IBS
Intelsat Business Service
Interim Link Management Interface; Interim Local Management Interface
ILOG
Information Log; Incoming Log
IBT
International Business Traveller
IC
Integrated Circuit
12
ILR
Issues List Report
IR
IM
Instant Messaging
IRD
Integrated Receiver/Decoder
IMA
Inverse Multiplexing over ATM
IRT
Integrated Receiver/Transcoder
IMBS
Ingress Maximum Burst Size
IS
In Service; Intermediate System
IMD
Intermodulation Distortion
ISA
Industry Standard Architecture
IME
Interface Management Entity
IS-ANR
In Service - Abnormal
IMT
Inter Machine Trunk
IN
Intelligent Network
IS-ANRST In Service - Abnormal and Restricted
INAP
Intelligent Network Application Part Protocol
I-NET
Institutional Network
INM
Integrated Network Manager
Inroute
see I/B
INT
Internal; Internal Clock
INTAP
Interoperability Technology Association for information Processing
INTP
Internodal Tunneling Protocol
IntServ
Integrated Services
INVW
Invalid Word Count
IOA
Input/Output Adapter
IOC
Initial Operating Configuration
IOF
Inter-office Fiber
IOR
Interoperable Object Reference ;Indian Ocean Region
IP
Intelligent Peripheral, IN block; Internet Protocol
IPC
Inter-process Communications; InterProcess or InterProcesser Control
IPCR IPCU
ISCC
Ingress Peak Cell Rate DAMA IP Channel Unit
Intermediate Reach
InterSwitch Communications Channel
ISCR
Ingress Sustainable Cell Rate
iSCSI
Internet Small Computer System Interface; SCSI Protocol over TCP/IP
ISD
Idle Signal Detection
ISDN
Integrated Services Digital Network
IS-IS
Intermediate System to Intermediate System
ISM
Industrial Scientific Medical
IS-NR
In Service - Normal
ISO
International Standards Organization
ISOC
the Internet Society
ISP
Internet Service Provider; Inside Plant
IS-RST
In Service - Restricted
ISTP
Internet Signaling Transport Protocol
ISV
Independent Software Vendor
IT
Information Technology
ITA
Installation, Test, and Acceptance
ITC
Independent Transmit Clock
ITE
Information Technology Equipment
IPG
Inter-Packet Gap
IPM
Interested Party Multicast
ITL
IPMI
Internet Protocol Multicasting Initiative
International Telecommunications Union
ITS
Intelligent Transportation System; Institute for Telecommunications Sciences
IPMS
Interested Party Multicast Service
IPOA
Internet Protocol over ATM
IPPV
Impulse Pay per View
ITT
International Telephone and Telegraph
ITU
International Telecommunication Union
ITU-T
ITU Telecommunications standards body
IPR
Intellectual Property Rights
IPsec
Internet Protocol Security
IPSL
Integrated IP Software License
IUC
Interval Usage Code
IPTA
Internet Protocol Transport Agreement
IVPN
International VPN
IPTV
IP Television
IWF
Interworking Function
IPX
Internet Package Exchange
IXC
Inter-exchange Carrier
13
J
LAC
Local Access Concentrator
J0
J Zero
LADM
Linear Add/Drop Multiplexer
J2EE
Java 2 Enterprise Edition
LAN
Local Area Network
JBR
Jabber Count
LANE
Local Area Network Emulation
JDBC
Java Database Connectivity
LAP
Link Access Procedure; Link Access Protocol
JDK
Java Development Kit
JDMK
Java Dynamic Management Kit
JDS-HR
Japan Digital Services - Half Rate
JEM
JAVA™ Element Manager
JMS
JAVA™ Messaging System
JNDI
Java Naming and Directory Interface
LAPS
Link Access Procedure
JPEG
Joint Photographic Experts Group
LASER
Light Amplification by Stimulated Emission of Radiation
LAPB
Link Access Procedure Balanced
LAPD
Link Access Procedure-D Channel (X 25)
LAPF
Link Access Procedure for Frame-Mode Bearer Services
JRE
Java Runtime Environment
JTAG
Joint Test Action Group
LATA
Local Access and Transport Area
JVM
Java Virtual Machine
LATM
Local ATM
LBC
Laser Bias Current
LBCL
Laser Bias Current Level
k
kilo (thousand)
LBCN
Normalized Laser Bias Current
K1
SONET or SDH overhead byte of MSP/ MS-SPRing (see K2)
LBO
Line Build Out
K2
LC
Used with K1-SONET or SDH overhead byte for MSP/MS-SPRing
Lucent Connector; Line Card
LCAP
Local Craft Access Panel
Kb
Kilobit
LCAS
Link Capacity Adjustment Scheme
KB
Kilobyte
LCC
Life-Cycle cost; Link Control Channel
Kb/s
Kilobits per second
LCD
Liquid Crystal Display
KB/s
Kilobytes per second
LCL
Lower Confidence Limit
Kbit/s
Kilobits per second
LCN
Kbps
Kilobits per second
Local Computer Network; Logical Channel Number; Local Communications Network
KBps
Kilobytes per second
LCR
Least Cost Routing
kBPS
kilo Bits Per Second
LCT
Large Capacity Terminal
kft
Kilofeet (USA cable length measurement)
LD
Laser Diode
kHz
LDAP
kilohertz (thousand hertz)
Lightweight Directory Access Protocol
Km
LDCC
Kilometer
Line Data Communications Channel
Ksh
LDCELP
Korn Shell
Low Delay CELP
ksym/s
LDP
Kilosymbols per Second
Label Distribution Protocol
LDS
Local Digital Switch
LEAF
Large Effective Area Fiber Local Exchange Carrier
K
ksym/sec Kilosymbols per Second kVA
1000 Volt Amperes
kW
LEC
Kilowatt
LECS
LAN Emulation Configuration Server
LED
Light Emitting Diode
L L2TP
LEO Layer 2 Tunneling Protocol
Low Earth Orbit
L3
LER
Layer 3
Label Edge Router
LA
LES
Line Adapter; Latin America
LAN Emulation Server
LF
Line Fail
14
LFE
Line Far End
LRDC
Long Reach Daughter Card
LGN
Logical Group Node
LSA
Low Speed ADM
LGX
Light-Guide Crossconnects
LSB
Least Significant Bit
LH
Logical Host
LSF
LIC
Line Interface Card
Loss of Signal or Frame indication signal
LIF
Line Interface
LIM
Line Interface Module
LIP
Local Information Packet
LIU
Line Interface Unit
LLC
Logical Link Control
LLSDCC
Lower-Layer Section DCC
LSL
Lower Specification Limit
LSM
Loss of Sync Message
LSN
Logical Subnetwork
LSP
Label Switched Path; Local Service Provider
LSR
Label Switch Router
LSSGR
LATA Switching System Generic Requirements
LT
Low Threshold; Laser Temperature
LTE
Line Terminating Equipment; Long Terminal Evolution
LM
Line Module
LMDS
Local Multipoint Distribution Service
LMI
Local Management Interface
LMP
Link Management Protocol
LNA
Low Noise Amplifier
LTN
Local Transport Network (fiber ring)
LNB
Low Noise Block
LTP
LO
Low Order
Link Termination Point; Logical Termination Point
LOADM
Lightweight Optical Add/Drop Multiplexer
LTS
Loop Testing System; Long Term Storage
LOC
Loss of Clock
LU
Line Unit
Locn
Location
LVD
Low-Voltage Distribution
LO-DXC
Low Order Digital Cross Connect
LWP
Low Water Peak
LOF
Loss of Frame
LZS
Lempel Ziv Stac
LOF-P
Path Loss of Frame
LOH
Line Overhead
M
LOM
Loss of Multiframe; List of Materials
M&C
Monitor and Control
LOP
Loss of Pointer
M12
MUX DS-1 into DS2
Loss of Pointer Decay Period
M13
MUX DS-1 into DS3
Loss of Pointer Inhibit
M23
MUX DS-2 into DS3
LOPIP
Loss of Pointer Integration Period
MAC
LOP-P
Loss of Pointer - Path
Media Access Control; Medium Access Control
LOP-V
VT Loss of Pointer
LOS
Loss of Signal
LOSS
Loss of Signal Seconds
LOVC
Low-Order VC
LOW
Local Orderwire
LP
Line Processor; Lockout of Protection; Low Order Path
Lport
Logical port
LP-S
Lockout of Protection - Span
LOPDP LOPI
LP-S/SF-P Lockout of Protection - Span/Signal Fail - Protection LR
Long Reach (fiber); Line Regeneration Equipment
15
MAN
Metropolitan Area Network
MAP
Main Audio Program; Mobile Application Part Protocol
MAU
Media Access Unit
Mb
Megabit
MB
Megabyte
Mb/s
Megabits per second
MB/s
Megabytes per second
Mbaud
Megabaud
Mbits/s
Megabits per second
Mb/s
Megabits per second
Mb/s
Megabytes per second
Mb/s
Million Bits Per Second
MBS
Maximum Burst Size
MO
Managed Object
MCC
Master Control Center / Computer
MOD
Module; Movies on Demand
MCP
Management Control Processor
MODEM
Modulator-Demodulator
MCPC
Multiple Channels Per Carrier
Modem
Modulator/Demodulator
MCR
Minimum Cell Rate; Minimum Cost Routing
MOF
Managed Object Framework
MOP
MCS
Master Control Station
Method of Procedure
MOR
MCT
Maintenance Channel Transparency
Multi-wavelength Optical Repeater
MOS
MCTF
Motion Compensated Temporal Filtering
Mean Opinion Score
MP
Management Portal
MP3
MPEG-2 Layer 3
MPCKTS
Multicast Packet Count
MPEG
Moving Pictures Expert Group
MPI
Multi-Path Interface; Multi-Path Interference
MDF
Main Distribution Frame
MDU
Multiple Dwelling Unit
mDVR
Multi-TV Digital Video Recorder
ME
Middle East
MEA
Mismatch of Equipment and Attributes
M-Plane
MEGACO Media Gateway Control Protocol
Management Plane
MPLmS
MEO
Medium Earth Orbit
Multi-Protocol Lambda Switching
MPLS
MER
Modulation Error Ratio
Multi Protocol Label Switching
MFR
Multilink Frame Relay
MPLS-CP MPLS Control Plane
MG
Media Gateway
MGC
Media Gateway Controller
MGCP MGN
MPN
Mode Partition Noise
MPOA
Multi Protocol over Asynchronous Transfer Mode
Media Gateway Control Protocol
MPS
Multiple Priority System
Management Gateway Node
MPT
Multiplex Pass-Through
MHz
Megahertz (million hertz)
MPT
MIB
Management Information Base
Ministry of Posts and Telecommunications
MID
Message Identifier
MPTS
Multiple Program Transport Stream
MR
Modification Request; Material Request; Medium Reach
MRRB
Maintenance Requirements Review Board; Material Release Review Board
ms
Milliseconds
MIPS
Millions of Instructions per Second
MIT
Management Information Tree
MiTTs
of Telecommunications Traffic
MJ
Major
ML
Mediation Layer
MLMD
Multiplexer/Demultiplexer
MLPPP
Multi-Link Point-to-Point Protocol
mm
millimeter
MS
Multiplex Section
MSA
Mediation Services Administrator
MS-AIS
Multiplex Section - Alarm Indication Signal
MM
Multimode; Multimedia
MSB
Most Significant Bit
MMCS
Meridian Multi Media Center Switch
MSC
MME
Multiwave Management Element
Metro Shelf Controller; Microsoft Cluster Server
MMF
Multi-Mode Fiber
MSF
Multiservice Switching Forum
Man Machine Language
MSN
Multi-Subnetwork
Main Material Order
MSNM
Metro Switching Network Manager
Multiwave Management Element
MSNM ML Metro Switching Network Manager Mediation Layer
MML MMO MMP MN
Minor
MNO
Mobile Network Operator
MNC
Multi-National Company
MSO
Multiple System Operator
MSOH
Multiplexer Section Overhead
16
MSP
Multiplex Section Protection; Multiservice Switching Path
NASA
National Aeronautical and Space Agency (US)
MS-P
Manual Switch - Protection
NAT
Network Address Translation
MSPP
Multiservice Provisioning Platform
NBI
Northbound Interface
MSPVC
Management Soft Permanent Virtual Circuit
NBK
No Backup
NC
MS-R
Manual Switch - Ring
Nodal Controller; Normally Closed (contacts)
MS-RDI
Multiplex Section - Remote Defect Indication
NCB
National Computer Board
NCC
MS-REI
Multiplex Section Remote Error Indication
Network Control Center/Computer
NCCC
Network Control Coordination Channel
MSS
Mobile Satellite Service
MS-S
Manual Switch - Span
MS-Spring/MSPR Multiplex Section Shared Protection Ring MST
Mountain Standard Time; Multiplex Section Termination
MSTE
Multiplex Section Terminating Equipment
MS-W
Manual Switch - Working
MTA
Multimedia Terminal Adapter
MTBF
Mean Time between Failure
MTIE
Maximum Time Interval Error
MTP
Message Transfer Part
MTTP
Transparent Connection Termination Point
MTTR
Mean Time to Repair
MTTU
Mean Time to Understand
MTU
Maximum Transmission Unit
MUX
Multiplexer
MUXCVR Muxceiver mV
Millivolt
MVOA
Miniature Variable Optical Attenuator
MZ
Mach-Zehnder
N NA
NAD
No Alarm; Not Alarmed; Not Applicable; Not Available; Numerical Aperture Network Access Domain
NCCI
Network Call Correlation Identification
NCP
Nodal Control Point; Nodal Control Processor
NCP&D
Network Capacity Planning and Delivery
NCR
Non-Conformance Report
NCS
Network Computing System; Network Control System; Network Call Signaling
NCT
Network Control Terminal
NCTA
National Cable & Telecommunications Association
NDC
National Destination Code
NDF
New Data Flag
NDIS
Network Design and Inventory System
NDMH
Non-Degraded Modem Hours
NDP
Network Discovery Protocol; Neighbor Discovery Protocol
NDSF
Non-Dispersion Shifted Fiber
NDVR
Network Digital Video Recording
NE
Network Element
NE/FE
Near End/Far End
NEBS
Network Equipment Building Standards; Network Equipment Building Systems
NEC
National Electric Code
NEF
Network Element Function
NEG
Negative Terminal
NEID
Network Element Identification
NEIR
Network Element Information Request
NEMA
National Electrical Manufacturers Association Networked File System
NAP
Network Access Point
NFS
NAPT
Network Address and Protocol |Translation
NGDLC
Next Generation Digital Loop Carrier
Network Access Server; Network Attached Storage
NG-L1
Next Generation Layer 1
NGNA
Next Generation Network Architecture
NAS
17
NGSO
Non-Geostationary Earth Orbit, used as a general descriptive for LEO and MEO systems.
NGW
National Gateway
NI
Network Interface
NIC
Network Interface Card
NSAP
Network Service Access Point
NSF
National Science Foundation (US)
NSI
Network Side Interface
NSN
Nationally Significant Number
NSP
Node Switch Provider; Node Switch Processor
NID
Network Interface Device
NT
NIDU
Network Interface Data Unit
Window New Technology
NTE
NII
National Information Infrastructure (for the USA, see also GII and EII)
Network Terminating Equipment
NTF
No Trouble Found
NIS
Network Infrastructure Solutions
NISC
National Information Services Council
NIU
Network Interface Unit
NLA
Network Layer Address; Network Layer Agent
NLC
Node Line Card
NLD
NTFCNCDE Notification Codes (TL1) NTFS
New Technology File System
NTP
Network Time Protocol
NTS
Near Term Storage; Network Time Synchronization
NTSC
Neighbor Link Discovery
National Television Standards Committee
NUT
NLPI
Network Layer Protocol Identifier
Non-preemptive Unprotected Traffic
NVM
nm
nanometer
Non-Volatile Memory
NVRAM
NM
Network Management; Network Manager; Network Management; Node Manager
Nonvolatile Random Access Memory
NZDSF
Non-Zero Dispersion Shifted Fiber
NMA
Network Monitoring and Analysis
NME
Network Management Ethernet
NMF
Node-level Management Function
NML
Network Management Layer
NMS
Network Management System
NN
N key on keyboard for a no response
NNI
Network to Network Interface; Network Node Interface
NNIF
Network to Network Interface
NNM
Network Node Manager
NNTP
Network News Transfer Protocol
NO
O O&M
Operations and Management
OA
Optical Amplifier
OA&M
Operations Administration and Management
OADM
Optical Add/Drop Multiplexer
OAM
Operations, Administration and Maintenance
OAMCell Operations, Administration and Maintenance Cell OAMP
Operation, Administration, Maintenance and Provisioning
Network Object; Normally Open (contacts)
O-BLSR
Optical-Bidirectional Line Switched Ring
NOC
Network Operations Center
OC
Optical Carrier
NOCC
Network Operations Control Center
OC-1
NPC
Network Parameter Control
Optical Carrier level 1, SONET bit rate = 51.84 Mb/s
NPR
Noise Power Ratio
NR
No Reply
NRT
Non-Real Time
NRTL
Nationally Recognized Test Laboratory
NRTVBR
Non Real-Time Variable Bit Rate
NRZ
Non-Return to Zero
ns
Nanosecond
NSA
Non Service Affecting
OC1
Optical Carrier level 1 (51.84 Mb/s)
OC-12
Optical Carrier level 12, SONET bit rate = 622.08 Mb/s
OC-192
Optical Carrier level 192, SONET bit rate = 9.953 Gb/s
OC-3
Optical Carrier level 3, SONET bit rate = 155.52 Mb/s
18
OC-48
Optical Carrier level 48, SONET bit rate = 2.488 Gb/s
OMG
Object Management Group
OMT
OCAP
OpenCable Application Platform
Orthogonal Mode Transducer
ON
OCH
Optical Channel
Optical Network
ONE
OCI
Open Connection Indication
Optical Network Element
ONP
OC-n
Optical Carrier-number; Optical Carrier where N denotes a multiple of 51.84 Mb/s
Open Network Provision
ONT
Optical Network Terminal
ONU
Optical Network Unit
OO
Optical-to-Optical
OOB
Out of Band
OOF
Out of Frame
OOK
On-Off Keying
OOM1
Out of Multi Frame Stage 1
OOM2
Out of Multi Frame Stage 2
OOO
Optical - Optical - Optical Out of Range
OCT
Octet Count
OCTU
Optical Channel Transport Unit
OCXO
Oven-Controlled Crystal Oscillator
ODA
Outlet Digital Adapter
ODBMS
Object Database Management System
ODF
Optical Distribution Frame
ODPR
Optically Dedicated Protection Ring
ODU
Outdoor Unit
OOR
ODUk
Optical channel Data Unit where k is 1 or 2
OOS
Out of Service
OOS-MA
Out of Service-Management
OEM
Original Equipment Manufacturer
OEO
Optical-to-Electronic-to-Optical
OOS-MAANR Out of Service-Management and Abnormal
OEPL
Optical Ethernet Private Line
OEPLAN
Optical Ethernet Private Local Area Network
OEVPL
Optical Ethernet Virtual Private Line
OEVPLAN Optical Ethernet Virtual Private Local Area Network OFC OFDM
OpEx
Operations Expenditure
OPM
Optical Performance Monitoring; Optical Power Meter
OPR
Optical Power Received
OPS/INE
Operations Provisioning System/ Intelligent Network Element
Open Fiber Control; Optical Fiber Communication
OPT
Optical Power Transmit
Orthogonal Frequency Division Multiplexing
OPTORL
Optical Return Loss
OpUk
Optical channel payload Unit where k is 1 or 2
OFS
Out of Frame Second
OFTEL
Office of Telecommunications (UK Regulator)
OQPSK
Offset Quaternary Phase-shift Keying
ORB
Object Request Broker
OID
Object Identifier
OIU
Operator Interface Unit; Optical Interface Unit; Office Interface Unit
Oribital Slot longitude position above the equator at which a satellite is located
OLA
Optical Line Amplifier; Optical Link Analysis
ORIG
Original; Originating
ORL
Optical Return Loss
OLB
Optical Link Budget
ORP
Optical Routing Protocol
OLM
Optical Link Module
OS
Operating System
OLMP
Optical Link Management Protocol
OSA
Optical Spectrum Analyzer
OLS
Optical Line System
OSC
OLT
Optical Line Termination; Optical Line Terminal
Optical Supervisory Channel; Optical Service Channel
OSDS
Operations Systems Data Server
OLTP
OSRP Link Termination Point
OSGI
Open Services Gateway Initiative
OM
Optical Module
OSHA
Occupational Safety and Health Act
OMC
Operation and Maintenance Center
OSI
Open Systems Interconnection
19
OSM
OSC Splitter Module
PAD
OSMINE
Operations Systems Modifications for the Integration of Network Elements
PAMA
Permanent Assignment Multiple Access
PAN
Optical Signal-to-Noise Ratio; Open Signal-to-Noise Ratio
Personal Area Networking
PARP
Proxy ARP
Optical Signaling Protocol; Outside Plant
PAS
PanAmSat
PAT
Program Association Table
OSNR OSP
Power Attenuation Device
PAX
Path Adaptation and X-Connect Petabyte
OSPF
Open Shortest Path First
OSPR
Optically Shared Protection Ring
PB
OSRP
Optical Signaling and Routing Protocols
PBOR
Primary-Backup Object Replication
PPB-TE
Provider Backbone Bridging Traffic Engineering
OSS
Operations Support System
OSSAN
Operations Support System Access Nodes
PBT
Provider Backbone Transport
PBX
Private Branch Exchange
OSS-AU
Out of Service-Autonomous
PC
Personal Computer; Physical Contact; Processor Card
OSS-AUMA Out of Service-Autonomous and Management
PC
Personal Computer
OSS-AURST Out of Service-Autonomous and Restricted
PCA
Protection Channel Access
PCB
Printed Circuit Board
OSWF
On-site Work Force
PCC
Processor Communication Channel
OTC
Operations Technical Center; Optical Transport Card
PCCA
Pacific Century Corporate Access
OTDR
Optical Time Domain Reflectometer
PCG
Pacific Century Group
OTGR
Operations Technology Generic Requirements
PCI
Peripheral Component Interconnect
OTN
Optical Transport Network
OTS
Optical Transport System
OTS RPTR OTS Repeater OTU
Optical Transport Unit
PCM
Pulse Code Modulation
PCMCIA
Personal Computer Memory Card Interface Adaptor
PCMM
PacketCable Multimedia
PCN
Program Change Notice; Product Change Notice ;Personal Communications Network
OUI
Organizationally Unique Identifier
OUNI
Optical User Network Interface
PCO
Pre-Conditioned Order
O-UPSR
Optical-Unidirectional Path Switched Ring
P-Code
Product Code
PCP
OUSM
Optical Utility Services Manager
Primary Cross-connection Point, street cabinet/flexibility point
OUSP
Optical Utility Services Platform
PCR
Peak Cell Rate
Outbound see O/B
PCS
Personal Communication System
Outroute see O/B
PDA
Personal Digital Assistant
OW
Order Wire
PDAP
Power Distribution and Alarm Panel
OXC
Optical Cross Connect
PDC
Passive Dispersion Compensator
PDF
Portable Document Format
PDH
Pleisiochronous Digital Hierarchy
P P2P
Peer to Peer
PDH
Plesiochronous Digital Hierarchy
P6
Pentium 6
PDI
Payload Defect Indication
PA
Port Adapter; Pre-Amplifier
PDL
Polarization Dependent Loss
PA
Power Amplifier
PDP
Policy Decision Point
PABX
Private Automatic Branch Exchange
PDU
Power Distribution Unit; Protocol Data Unit
20
PEG
Public, Education, Government
PN
Pseudo Noise; physical node
PEM
Processor Enhancement Module; Processor Element Module
PNC
Physical Node Controller
PNNI
PEP
Policy Enforcement Point
Private Network-to-Network Interface; Private Network Node Interface
PESQ
Perceptual Evaluation of Speech Quality
PO
Purchase Order
POC
PFE
Path Far End
Point Of Contact
POH
PFM
Packet Forwarding Module
Path Overhead
POM
PFO
Premium Feature Open
Project Office Manager
PON
PG
Peer Group; Protection Group
Passive Optical Network
PGID
Peer Group Identifier
POP/PoP Point of Presence, usually referring to an Internet service provider/access point
PGL
Peer Group Leader
PHY
Physical Layer Device; Physical
PIC
Programmable Interrupt Controller
POS
Packet over SONET; Positive Terminal
Personally Identifiable Data; Protocol Identifier; Packet Identifier; Personal Identification
POST
Power on Self Test
POTS
Plain Old Telephone Service
PPC
PIF
Packet Interface FPGA
Power PC
PPD
PIN
Photo Intrinsic; Positive-Intrinsic Negative; Personal Identification Number
Partial Packet Discard
PPJC
Positive Pointer Justification Count
PID
PING
Packet Internet Groper
PIP
Plug-In Provisioning
PJ
Pointer Justification
PL
Packet Loss
POR
Power on Reset
PPL
Point-to-Point Link
PPM
Parts per Minute; Parts per Million; Pulses per Million
Pport
Physical port
PPP
Point-to-Point Protocol
PPS
Path Protection Switched; Pulses per Second
PLC
Packet Loss Concealment
PLCN
Pilot Line Change Notification
PPT
PLCP
Physical Layer Convergence Protocol
Power Passing Tap
PRB
PLD
Programmable Logic Device
Project Review Board
PRBS
PLDT
Philippines Long Distance Telephone Company
Pseudo Random Bit Sequence
PRC
Primary Reference Clock
PLL
Phase Locked Loop
PLM
Payload Label Mismatch
PLM-P
Payload Label Mismatch - Path
PLM-V
Payload Label Mismatch - VT
PLN
PNNI Logical Node
PLO
Path Layer Overhead
PM
Performance Management; Performance Monitoring; Program Manager; Project Manager
PMA
Power Management Algorithm
PMBB
Performance Monitoring Building Block
PMD
Polarization Mode Dispersion
PMDC
PMD Compensator
PMM
Power Management Module
PMO
Program Management Office
PRI
Primary Rate Interface
PRNG
Pseudo Random Number Generators
PROM
Programmable Read Only Memory
PROT
Protocol; Protection
PRS
Primary Reference Source
PS
Power Supply; Policy Server
ps/nm-km Pico-second PSA
21
PacketCable Service Agreement
PSBF
Protection Switching Byte Failure
PSC
Protection Switching Count; Project Steering Committee
PSD
Protection Switching Duration
PSEL
Presentation Suite
PSI
Program Specific Information
PSL
Path Signal Label
PSM
Persistent Stored Module
R/W
Read/Write
PSN
Packet Switch Node; Packet Switched Network
RADIUS
Remote Authentication Dial-In User Service
P-SNC
Permanent SNC
RAI
Remote Alarm Indication
PSQM
Perceptual Speech Quality Measurement
RAID
Redundant Array of Inexpensive Disk; Redundant Array of Independent Disk
PSR
Protection Side Regeneration; Path Switched Ring
RAIG
Resource Availability Information Group
RAITN
Regional Arab Information Technology Network
PST
Primary State; Pacific Standard Time
PSTN
Public Switched Telephone Network
RAM
Random Access Memory
PSU
Power Supply Unit; Packet Switch Unit
RAN
Regional Area Network; Radio Access Network
PT
Pass-Through; Payload Type
PTE
Path Terminating Equipment
PTI
Payload Type Indicator
PTO
Private Telecommunications Operator
PTP
Physical Termination Point; Point-To-Point; Path Termination Point
PTS PTSE
Per Trunk Signaling PNNI Topology State Element
RASCOM Regional African Satellite Communications Organisation RBF
Reconfigurable Blocking Filter
RBM
Regional Business Manager
RBOC
Regional Bell Operating Company
RBW
Resolution Bandwidth
RCC
Routing Control Channel Receiver
PTSP
PNNI Topology State Packet
RCV
PTT
Posts, Telegraph and Telephone company (usually a government monopoly operator)
RCVR
Receiver
RDF
Rate Decrease Factor
RDI
PV
Protocol Violation
Remote Defect Indication
RDI-L
PVC
Permanent Virtual Circuit; Poly Vinyl Chloride; Private Virtual Circuit
Remote Defect Indication - Line
RDI-P
Remote Defect Indication - Path
RED
Random Early Detection; Random Early Discard Reference
PVR
Personal Video Recorder
PWB
Printed Wire Board
REF
PWM
Pulse Width Modulation
REI
PWR
Power
Remote Error Indication
REI-L
Remote Error Indication - Line
Q Q3
Telecommunications Management Network (TMN) Interface
QAM
Quadrature Amplitude Modulation
QL
Quality Level
QMC
QUICC Multichannel Controller
QoS
Quality of Service
QPM
Quarterly Progress Meeting
QPR
Quarterly Progress Report
QPSK QUICC
REI-P
Remote Error Indication - Path
Rev.
Revision
RF
Radio Frequency
RFC
Request for Comment
RFFP
Request For Final Proposals
RFI
Radio Frequency Interference; Remote Failure Indication; Request for Information
RFI-L
Remote Failure Indication (detected at the line-layer)
Quadrature Phase Shift Keying
RFI-P
Quad Integrated Communications Controller
Remote Failure Indication (detected at the path-layer)
RFP
Request for Proposal
RFT
Radio Frequency Transmitter used to describe large antennas with associated receive/transmit equipment
RG
Residential Gateway
R R&D
Research and Development; Research and Design
R.H.
Relative Humidity
22
RHC
Regional Holding Company
RIB
Routing Information Base
RIN
Relative Intensity Noise
RIP
Routing Information Protocol
RJ
Registered Jack
RJ-11
Registered Jack –11
RKS
Record Keeping Server
RMA
RTP
Routing Table Protocol; Real-Time Transport Protocol; Routine Task Procedure
RTPS
Real Time Streaming Protocol
RTRV
Retrieve
RTS
Ready to Send; Request to Send; Real Time Operation System
Return Material Authorization; Replace Material Authorization
RTSP
Real Time Streaming Protocol
RMAN
Recovery Manager
RTT
Round-trip Time
RMI
Remote Method Invocation
RTU
Right to Use
RMS
Root Mean Square
RTVBR
Real-Time Variable Bit Rate Traffic
RNR
Not Ready to Receive; Remote Failure Indication
RU
Rack Unit
RW
Rewind
ROADM
Re-configurable Optical Add/Drop Multiplexer
ROC
Regional Operations Center
ROI
Return on Investment
ROM
Read Only Memory
ROW
Return OrderWire
RPM
Revolutions per Minute
RPR
Resilient Packet Ring
RR
Ready to Receive; Reverse Request
RRB
Reliability Review Board
RRO
Record Route Object
RR-R
Reverse Request - Ring
RR-S
Reverse Request - Span
RS
Regenerator Section; Reed-Solomon
RS232
Recommended Standard –232
RS-E
Ring Switch - East
RSOH
Regenerator Section Overhead
RSP
Route Switch Processor
RSTP
Resilient Spanning Tree Protocol
RST
Regenerator Section Terminating
RSVP
Resource Reservation Protocol
RSVP-TE
Resource Reservation Protocol with Traffic Engineering
R/W
Read/Write
RWA
Routing and Wavelength Assignment
RX
Receive
Rx Line
Receive Line
RZ
Return to Zero
RZ-DPSK
Return to Zero Differential Phase Shift Keying
S s
Second
s.f.
Square Foot
S/IMP
Signal to Impulse Ratio
S/N
Signal to Noise Ratio
SA
Service-Affecting
SAAL
Signaling ATM Adaptation Layer
SABLIME Product Administration System (AT&T) SAN
Storage Area Network
SAP
Secondary Audio Program
SAR
Segmentation and Reassembly
SARP
Switching Address Resolution Protocol
SAS
Severely Errored Frame and AIS Seconds
SAAS
Software As A Service
SASE
Standalone Synchronization
SATA
Serial AT Attachment
SATCOM
Satellite Communications Satellite Capacity
SATT
Synchronization, Alarms, and Telemetry Termination
RS-W
Ring Switch - West
RT
Remote Terminal; Real Time
RTC
Real-Time Clock
SAW
Surface Acoustic Wave
RTI
Real-Time Ingest
S-band
frequency band
RTN
Return (voltage return)
SBLK
Errored Superblocks
RTO
Recovery Time Objective
SBS
Stimulated Brillouin Scattering
RTOS
Real-Time Operating System
23
SBV
Switched Broadcast Video
SDTV
Standard Definition Television
SBW
Signal Bandwidth
SDU
Service Data Unit
SC
Service Channel; Square Connector; Shelf Controller
SE
Systems Engineer
SEAL
SCADA
Supervisory Control and Data Acquisition
Simple and Efficient Adaptation Layer
SEC
Secondary
SCC
Serial Communications Controller; Serial Communications Channels
SEF
Severely Errored Framing
SEFS
Severely Errored Frame Seconds
SCCI
Small Computer System Interface
SEFS-S
SCCP
Signalling Connection Control Part, part of SS7
Severely Errored Framing Seconds Section
SEM
Service Entitlement Manager
S-CDMA
Synchronous Code Division Multiple Access
SEMS
Severely Errored Multi-frame Seconds
SerDes
Serializer/DeSerializer
SCE
Service Creation Environment, IN block
SES
Severely Errored Seconds
SCEP
Service Creation Environment Point, IN block
SES-L
Severely Errored Seconds - Line
SES-LFE
SCF
Service Control Function, IN block
Severely Errored Seconds Line Far End
SCM
Service Channel Modem; Sub-carrier Multiplexing
SES-P
Severely Errored Seconds - Path
SES-PFE
Severely Errored Seconds Path Far End
SCN
Service Channel Network; Shared Content Network
SESR
Severely Errored Second Ratio
SCP
Service Control Point, IN block
SES-RS
Severely Errored Seconds Regenerator Section Severely Errored Seconds - Section
SCPC
Single Channel per Carrier
SCR
Sustainable Cell Rate; Silicon Controlled Rectifier
SES-S SES-V
Severely Errored Seconds - VT
SCSI
Small Computer System Interface
SES-VFE
Severely Errored Seconds - VT Far End
SCTE
Society of Cable Telecommunications Engineers
SETS
Synchronous Equipment Timing Source
SD
Signal Degrade; Signal Detect; Standard Definition
SF
Signal Failure; Super Frame
SFD
Start of Frame Delimiter
SDA
System Design Authority
SFF
Small Form Factor (connector)
SDCC
Section Data Communications Channel
SFO
Sync Frequency Offset
SDF
Service Data Function, IN block
SDH
Synchronous Digital Hierarchy
SDI
Secure Digital Interface; Serial Digital Interface
SFP
Small Form-factor Pluggable
SF-R
Signal Failure - Ring
SF-S
Signal Failure - Span
SG
Signaling Gateway
Synchronous Data Link; Synchronous Delay Line
SGC
Signaling Gateway Controller
sh
Bourne Shell
SDLC
Synchronous Data Link Control
SHx
Shelf Number
SDMA
Space Domain Multiple Access
SI
SDMH
Severely Degraded Modem Hours
Serial Interface; Service Independent ; System Integrator
SDP
Service Data Point, IN block
SIB
Service Independent Building Block, IN block
SIC
System Integrity Control; Standard Industrial Classification
SID
System Identification number; Source Identifier
SDL
SD-P
Signal Degrade - Path
SD-R
Signal Degrade - Ring
SDRAM
Synchronized Dynamic Random Access Memory
SD-S
Signal Degrade-Span
24
SIF
SONET Interoperability Forum; Switch Interface FPGA
SNCP/N
Subnetwork Connection Protection/ Non-intrusive monitoring
SIM
Service Interface Module
SNG
Satellite News Gathering
SIP
Session Initiation Protocol
SNM
Switching Network Manager
SITA
Société Internationale de Télécommunications Aéronautique
SNMP
Simple Network Management Protocol
SNP
SLA
Service Level Agreement
Sequence Number Protection
SNR
SLIP
Serial Line Internet Protocol
Signal-to-Noise Ratio
SNTP
SLM
Service Layer Manager
Simple Network Time Protocol
SOA
SLOSS
Synchronization Loss
Semiconductor Optical Amplifier
SOF
SLR
Service Level Report
Start of Frame
SOH
SM
Single Mode; Switching Module; Shelf Manager
Section Overhead; State of Health
SOHO
Small Office/Home Office
SONET
Synchronous Optical Network, US equivalent to SDH
SOP
Standard Operating Procedure; Service Provider
SMAP
Service Management Access Point, IN block
SMB
Small and Medium Business
SMC
Serial Management Controllers; Standard Management Committee
SP
SMCS
Short Message Service Center
Shelf Processor; Shelf Pump; Service Provider
SPC
SMDS
Switched Multimegabit Data Service
SONET Permanent Circuit
SPCN
SME
Small and Medium Enterprise; Short Message Entity
Satellite Personal Communications Network
SPE
SMF
Single Mode Fiber
Synchronous Payload Envelope
SPF
SMIR
Single Mode Intermediate Reach
Shortest Path First
SPI
SML
Service Management Layer
Serial Peripheral Interface; Service Provider Interface
SMLR
Single Mode Long Reach
SPM
Self-Phase Modulation
SMM
Service Mediation Module
SPR/SPRing Shared Protection Ring
SMON
Switch Monitor
SPTP
Service Path Termination Point
SMOP
Service Method of Procedure
SPVC
SMP
Service Management Point, IN block
Soft Permanent Virtual Connection; Soft Permanent Virtual Circuit
SMS
Service Management System, IN block; Service Management Suite; Short Message Service
SQL
Structured Query Language
SR
Short Reach (fiber)
SRAM
Short Message Service Centre, part of GSM messaging system
Static Random Access Memory
SRC/DST
Source/Destination
SMT
Surface Mount Technology; Self-Monitoring Task
SRD
Software Release Document
SRF
S-MTA
Standalone Multimedia Terminal Adaptor
Specialised Resource Function, IN block
SRN
Software Release Notice
SMSC
SN
Service Node, IN block
SNA
Systems Network Architecture
SNC
Subnetwork Connection; Subnetwork Controller
SRS
Stimulated Raman Scattering
SRTS
Synchronous Residual Time Stamp
SRVEFF
Service Affecting (TL1)
SNCP
Subnetwork Connection Protection
SS/TDMA Satellite Switched Time Division Multiple Access, Intelsat service
SNCP/I
Subnetwork Connection Protection/ Inherent monitoring
SS5
Signaling System 5
SS7
Signalling System 7, supported by the ITU-T, also known as CCITT 7
25
SSB
Single Sideband
STS-3
Synchronous Transport Signal Level 3
SSCOP
Service Specific Connection Oriented Protocol
STS-3c
Synchronous Transport Signal Level 3, concatenated
SSCS
Service-Specific Convergence Sublayer
STS-n
Synchronous Transport Signal n
SSEL
Session Selector
STS-Nc
SSF
Server Signal Failure ; Service Switching Function
Contiguous Concatenation of N STS-1 SPEs
STS-N-Xv Virtual Concatenation of X STS-N SPEs
SSL
Secure Sockets Layer
STU
Secure Telephone Unit; Synchronized, Traceability Unknown; Stratum Traceability Unknown
STU-P
Stratum Traceability UnknownProvisioned
SVC
Switched Virtual Circuit
SSM
Synchronization-Status Messages
SSMF
Standard Single Mode Fiber
SSP
Service Switching Point, IN block
SSPA
Solid State Power Amplifier
SST
Secondary Service State
SSTUR
Site-Specific Turn-Up Report
SSU
Synchronization Supply Unit ; Subscriber Terminals
ST
Straight Terminus; Straight Tip
ST1
Stratum 1; Switched T1
ST2
Stratum 2
ST3
Stratum 3
ST3E
Stratum 3 Enhanced
ST4
Stratum 4 (Asynchronous)
STB
Set-Top Box
STC
Stacking and Timing Card
STE
Section Terminating Equipment; Section Terminating Element
STII (2)
Type of optical connector
STM
Synchronous Transfer Mode, or Module
STM-0
SVCC
Switched Virtual Channel Connection
SVOD
Subscription Video on Demand
SVP
Secure Video Processor
SVPC
Switched Virtual Path Connection
SW
Software
SWCA
Split Working Channel Access
SWID
Software Identifier
SWOD
Software ODACS
SX
Short Reach as in 1000Base-SX
SYNC
Synchronization
SYNCIO
Synchronized Input/Output
SYSLOG
System Log
T T1
Service or line operation at the DS-1 rate
Synchronous Transfer Mode level 0, SDH bit rate = 51.84 Mb/s
T1
1.544 Mb/s (US orientated)
T3
Digital Carrier System for DS3 Signals
STM-1
Synchronous Transfer Mode level 1, SDH bit rate = 155.52 Mb/s
TAC
Transport Aggregated Circuit; Technical Assistance Center
STM-16
Synchronous Transfer Mode level 16, SDH bit rate = 2488.32 Mb/s
TACACS
Terminal Access Controller Access Control Systems
STM-4
Synchronous Transfer Mode level 4, SDH bit rate = 622.08 Mb/s
TACS
Total Access Communications Systems (Analogue)
STM-64
Synchronous Transfer Mode level 64, SDH bit rate = 9953.28 Mb/s
TADR
Target Address
STM-n
Synchronous Transport Module n
TAM
STM-nC
Synchronous Transport Module of level n concatenated
Total Available Market
TAP
STMX
SONET/SDH Thin Multiplexer
Test Access Port; Technician Access Port
TARP
STP
Spanning Tree Protocol; Shielded Twisted Pair
Target Identifier Address Resolution Protocol
TAS
STS
Synchronous Transport Signal
Telecommunications Authority of Singapore
STS-1
Synchronous Transport Signal Level 1
TB
Terabyte
TADRMAP Target Address Map
26
TBD
To Be Determined
TBOS
Telemetry Byte Oriented Serial Protocol
TIRKS
Trunk Integrated Record Keeping System
TBUS
Timing Bus
TISSA
Transmission Convergence; Transport Complex; Transport Channel
Time Space Switch Application-Specific Integrated Circuit
TC
Hz
Hertz
TCA
Threshold Crossing Alert; Timing Control and Access
TKIP
Temporal Key Integrity Protocol
TL-1
Transaction Language 1
TCBE
Total Corrected Bit Error
TL-1 CLI
TCM
Trellis Coded Modulation; Transport Channel Members
Transaction Language One, Command Line Interface
TLC
Transport Logical Connection
TCMO
Transport Complex Managed Object
TLI
TCP
Transmission Control Protocol; Trouble Cleaning Procedure
Transaction Language Command Line Interface
TLS
Transparent LAN Services
TCP/IP
Transmission Control Protocol/Internet Protocol
TLSR
Transoceanic Line Switched Ring
TLV
TCTP
Transparent Connection Termination Point
Type-Length-Value
TM
Timing Module; Transaction Manager
IN
Intelligent Network
TD
Traffic Director
TDEV
Time Deviation
TDM
Time Division Multiplexing
TDMA
Time Division Multiple Access
TMC
Terminal Monitor and Control
TML
Telephony Markup Language
TMN
Telecommunications Management Network
TE
Terminal Equipment
TMO
TEC
Thermo-Electric Cooler
Trans Metro Optical (platform)
tmout
TED
Traffic Engineering Database
Time Out
tmper
TEI
Terminal Endpoint Identifier; Terminal Equipment Identifier
Time Period
TMUX
Terminal Multiplexer
Telco
Telephone Company
TELR
Talker Echo Loudness Rating
TEO
Telephone Equipment Order
TERM
Termination
TFT
Thin Film Transistor
TFTP
Trivial File Transfer Protocol
TNL
Ethernet Tunneling
TNM
Transport Network Management
TOD
Television on Demand
ToD
Time of Day
TOH
Transport Overhead
TOP
Task Oriented Practice; Task Oriented Procedure Type of Service
TG
Timing Generator
TOS
TGCP
Trunking Gateway Control Protocol
TP
TGS
Time Generation System
Termination Point
TPFI
THEC
Corrected Type Header Error Correction Code
Timing Plane Fault Isolation
TQM
Total Quality Management
TR
Technical Reference
THz
TeraHertz (1012 hertz)
TI
Terrestrial Interference
TIA
Telecommunications Industry Association
TRIB
Tributary
TRM
Technical Review Meeting
tRTO
TCP Retransmit Timeout
TrTOH
Transparent Transport Overhead
TS
Time Slot; Time Stamp; Time Synchronization
TID
Target Identification; Terminal Identification
TIE
Time Interval Error
TIM
Trace Identifier Mismatch; Transmit Intermediate Multiplexer
TSA
Time Slot Assignment
TSD
Transport System Division
TIM-S
Trace Identifier Mismatch - Section
TSE
Topology State Element
27
TSEL
Transport Selector
UCD
TSF
Transport Signal Failure
UD
Unconditional Disconnect
TSG
Timing Signal Generator
UDLR
Unidirectional Link Routing
TSI
Time Slot Interchange; Time Switch Interchange
UDP
User Datagram Protocol
UDR
TSR
Technical Service Representative
Unconditional Disconnect Response
UEM
TSX
Time-Space Switch ASIC
Universal Equipment Modules
UEQ
TTE
Transparent Terminal Equipment
Unequipped
UGC
TTL
Transistor Transistor Logic; Time to Live
Universal Gateway Carrier
UGS
TTP
Trail Termination Point
Unsolicited Grant Service
UHD
TTTP
Transparent Trail Termination Point
Ultra High Density
UHF
TU
Tributary Unit; Transmission Unit
Ultra High Frequency
UI
TUG
Tributary Unit Group
User Interface
UIC
TUG-n
Tributary Unit Group, level n
User Interface Client
UID
TU-n
Tributary Unit, level n
User Identifier
UITS
TV
Television
Unacknowledged Information Transfer Service
TVRO
Television Receive Only earth station
UL
Underwriters Laboratories
TW
TrueWave – fiber brand
ULH
Ultra Long Haul
TWC
TrueWave Classic – fiber brand
ULSDCC
TX
Transmit
Upper Layer Section Data Communications Channel
Tx Line
Transmit Line
UMTS
Universal Mobile Telecommunications System
U UAE
United Arab Emirates
UART
Universal Asynchronous Receiver/Transmitter
UAS
Unavailable Seconds
UASL
Unavailable Second Count-Line
UAS-L
Unavailable Seconds - Line
UAS-LFE
Unavailable Seconds - Line Far End
UASP
Unavailable Second Count-Path
UAS-P
Unavailable Seconds - Path
UAS-PFE
Unavailable Seconds - Path Far End
UAS-RS
Unavailable Seconds - Regenerator Section
UAS-S
Unavailable Seconds - Section
UAS-V
Unavailable Seconds - VT
UAS-VFE
Unavailable Seconds - VT Far End
UAT
Unavailable Time
UB
Uncorrected Block
UBR
Undefined Bit Rate; Unspecified Bit Rate
UBRVBR
Unspecified Bit Rate Variable Bit Rate
UC
User Channel
UCBE
Uncorrectable Block Error
Upstream Channel Descriptor
UNEQ
Unequipped Path; Unequipped
UNEQ-P
Unequipped Path
UNEQ-V
Unequipped VT
UNEs
Unbundled Network Elements
UNI
User Network Interface
UNI/UNIF User Network Interface UNII
Unlicensed National Information Infrastructure
UOG
Universal OSS Gateway
UPC
Ultra Physical Contact; Universal Packet Carrier; Usage Parameter Control
UPN
Universal Personal Number
UPnP
Universal Plug and Play
UPS
Uninterrupted Power Supply
UPSR
Unidirectional Path Switched Ring
UPT
Universal Personal Telecommunications
URI
Universal Resource Identifier
URL
Universal Resource Locator
US
Upstream
USB
Universal Serial Bus
USEPA
United States Environmental Protection Agency
UTC
Universal Time Coordinated; Universal Transport Carrier
28
UTOPIA UTP
Universal Test and Operations Physical Interface for ATM
VG
Virtual Group
VGA
Unprotected Termination Point; Unshielded Twisted Pair
Variable Gain Amplifier
VHF
Very High Frequency
VLAN
Virtual Local Area Network
VLR
Very Long Reach
VM
Voice Mail; Virtual Memory; Virtual Machine
VME
Versa Module Eurocard
UV
Ultraviolet
PRI
Primary Rate Interface
UVC
Universal Voice Carrier; Universal Video Carrier
V V
Voltage
PSTN
Public Switched Telephone Network
V/A
Video/Audio
VAC
Voltage Alternating Current
VAD
Voice Activity Detection
VADSL or Very high speed (Asymmetric) VDSL Digital Subscriber Line VAP
Virtual Access Partitioning
V-band
50/40 GHz
VBI
Vertical Blanking Interval
VBR
Variable Bit Rate
VC
Virtual Circuit; Virtual Channel; Virtual Container; Virtual Concatenation
VCAT
Virtual Concatenation
VCC
Virtual Channel Connection
VCG
Virtual Concatenation Group
VCI
Virtual Channel Identifier
VCL
Virtual Channel Link
VMM
Voice/Modem Module
VOA
Variable Optical Attenuator
VOD
Video on Demand
VoIP
Voice over Internet Protocol
VOM
Volt-Ohm Meter
VOQ
Virtual Output Queuing
VOW
Voice Order Wire
VP
Virtual Path
VPC
Virtual Path Connection
VPCI
Virtual Path Connection Identifier
VPG
Virtual Path Group
VPI
Virtual Path Identifier
VPI/VCI
Combined, VPI and VCI identify a connection on an ATM Network
VPL
Virtual Path Link
VPLS
Virtual Private LAN Service
VPN
Virtual Private Network
V-pole
Vertical-pole
VPS
Voice Processing System
VPSP
Virtual Path Switch Protection
VRRP
Virtual Router Redundancy Protocol
VSA
Virtual-Scheduling Algorithm; Vector Signal Analyzer
VCM
Virtual Concatenation-group Member
VC-N
Virtual Container Level N (N=11, 12, 2, 3, 4)
VC-N-Xc
Contiguous Concatenation of X Virtual Containers at Level N
VSAT
Very Small Aperture Terminal
VC-N-Xv
Virtual Concatenation of X Virtual containers at Level N
VSI
Vendor-Specific Information
VSR
Very Short Reach
Voltage Controlled Oscillator
VSSP
Virtual Service Switching Point
VCR
Video Cassette Recorder
VT
Virtual Tributary
VCSEL
Vertical Cavity Surface-Emitting Laser
VT-100
Terminal Emulation System
VCXO
Voltage Controlled Crystal Oscillator
VTG
Virtual Tributary Group
VDC
Volts Direct Current
V-UNI
Virtual User Network Interface
VDSL
Very-high-bit-rate Digital Subscriber Line
VEC
Voice Equivalent Circuit
VF
Virtual Fiber; Virtual Facility
VFCU
Voice/FAX Channel Unit
VFTP
Virtual Facility Termination Point
VCO
W
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W
Watt; Working
WAD
Wavelength Add and Drop
WAN
Wide Area Network
WB
Working Band; Westbound
Z
WBS
Work Breakdown Structure
ZAC
Zero Administration Client
WC
Watts per channel
ZWP
Zero Water Peak
WCA
Working Channel Access
WCSS
WDM Capable Switching System
W-DCS
Wideband Digital Cross-Connect System
WDM
Wavelength Division Multiplexing
WDT
Watchdog timer
WE
Western Europe
WECA
Wireless Ethernet Compatibility Alliance
WEP
Wired Equivalency Privacy
WFA
Workforce Automation
WFM
Workforce Management
WFQ
Weighted Fair Queuing
WIF
Wide Area Network Interface
WiFi
Wireless Fidelity
WiMedia
An alliance for Wireless Multimedia
WLAN
Wireless Local Area Network
WLL/WiLL Wireless Local Loop, WiLL is also Motorola’s WLL product line name WM9
Windows Media Player Version 9
WPA
Wireless (WiFi) Protected Access
WPS
Working/Protect Splitter
WRED
Weighted Random Early Discard; Weighted Random Early Detection
WSS
Wavelength Selective Switch
WTO
World Trade Organisation
VPN
Virtual Private Network
WTR
Wait to Restore
WWN
World Wide Name
WWW
World Wide Web
X X.25
Packet Switched Communications Interface
XC
Cross Connect
XCVR
Transceiver
XDSL
See DSL (Digital Subscriber Line)
XFP
10 Gb/s small form-factor pluggable transceiver
XML
Extensible Markup Language
XMTR
Transmitter
XPM
Cross-Phase Modulation
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Notes
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Notes
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Headquarters 1201 Winterson Road Linthicum, Maryland 21090 Toll Free (800) 921-1144 Phone (410) 694-5700 Fax (410) 694-5750 www.ciena.com
