Anurag BSNL Report

2011 BSNL TRAINING REPORT

ANURAG SINGH ELECTRONICS & INSTRUMENTATION FINAL YEAR BBS COLLEGE OF ENGGINEERING & TECHNOLOGY, ALLAHABAD 12/9/2011

Acknowledgement I acknowledge my gratitude and thank to all the well knowledge persons for giving me opportunity to avail all the best facilities available at this telecom centre through which I have gained knowledge thinking so as too just in the environment suitable for harmonic adjustment. I am grateful to the following persons for various help rendered by them during the training period. Mr. Vikash Mishra (JTO) finally, a deep thanks to Mr. Rajaram Yadav (General Manager)

Last but not the least; I thank my teacher, friends and my family members for their constant encouragement.

SUBMITTED BY: ANURAG SINGH B.TECH EIE-FINAL YEAR BBS COLLEGE OF ENGINEERING & TECHNOLOGY, ALLAHABAD

PREFACE B.TECH program is one of the most reputed professional courses in the Industry. There is an Industrial Training as an integral part of B.TECH. As a complementary to that everyone has to submit a report on the work conducted in the industry. This report is thus prepared for the training done at Bharat Sanchar Nigam Limited (B.S.N.L). The organization shall make all possible efforts to have a secure and safe domain. The data/information is very important and most critical to the business requirements; therefore proper measures should be adopted so that the information is well secured and protected.

SUBMITTED BY: ANURAG SINGH B.TECH EIE-FINAL YEAR BBS COLLEGE OF ENGINEERING & TECHNOLOGY, ALLAHABAD

INTRODUCTION Today, BSNL is the No. 1 telecommunication company and the largest public sector undertaking of India and its responsibilities includes improvement of the already impeccable quality of telecom services, expansion of telecom services in all villages and instilling confidence among its customers. Apart from vast network expansions, especial emphasis has given for introducing latest technologies and new services like I-NET, INTERNET, ISDN (INTEGRATED SERVICES DIGITAL NETWORK), IN (INTELLIGENT NETWORK), CDMA, GSM and WLL (WIRELESS IN LOCAL LOOP), BROADBAND, 3G services etc. Now BSNL has also entered in mobile communication. BSNL has all the new services send technological advantages, which are available with any well, developed Telecom network anywhere else in the country. Full credit for all above achievement goes to the officers and staff of the BSNL. The administration is fully aware of the challenges lying ahead and quite committed to provide the latest and best telecom services by their continued support and active co-operation.

COMPANY PROFILE

BHARAT SANCHAR NIGAM LIMITED Bharat Sanchar Nigam Limited (BSNL) is India's leading telecommunications provider and the country's largest public-sector firm. BSNL provides local-exchange access and domestic long-distance services through a network of more than 45 million access lines covering most of India. It also offers wireless communications, data and Internet services, as well as business voice and data services. The company is still controlled by the government, as is one of India's other large phone companies, Mahanagar Telephone Nigam Limited (MTNL). Plans to merge the two companies have been discussed but seem to be on hold.

HIGHLIGHTS  Bharat Sanchar Nigam Limited has a vast reservoir of highly skilled and Experienced work force of about 3,57,000 personnel.  We believe that our staff, which is one of the best trained manpower in the telecom sector, is our biggest asset.  To meet the technological challenges, employees are trained for technology up-gradation, modernization, computerization etc in BSNL's training Centers spread across Country.  To apex training centers of BSNL i.e. Advance level Telecom Training Center (ALTTC) at Ghaziabad and Bharat Ratna Bhimrao Telecom Training Center At Jabalpur are comparable to any world class Telecom Training Center.  Moreover, 43 zonal training centers and a National Academy of Telecom Finance and Management have been running for several years now.

 Different curriculums run in these centers to impart technology based training, Training for Attitudinal change, basic educational and skill development Program etc.

DOT: Till 31st December, 1984, the postal, telegraph and telephone services were managed by the Posts and Telegraphs Department. In January 1985, two separate Departments for the Posts and the Telecommunications were created. The accounts of the department, initially, were maintained by the Accountant General of the P&T. However, by April 1972, the telecommunications accounts were separated. Simultaneously the department also started preparing the balance sheet annually. With the takeover of the accounts from the audit and delegation of larger financial powers to the field units, internal Financial Advisers were posted to all the circles and units. The Telecommunication Board consisted of the Secretary Telecommunications, who was the Chairman with Member (Finance), Member (Operations), Member (Development), Member (Personnel) and Member (Technology). The Telecom Commission was constituted in 1989. The Commission has the DoT Secretary as its Chairman with Member (Services), Member (Technology) and Member (Finance) as its full time members. The Secretary (Finance), Secretary (DoE), Secretary (Industries) and Secretary (Planning Commission) are part time members of the Commission. The Department in 1986 reorganised the Telecommunication Circles with the Secondary Switching Areas as basic units. This was implemented in a phased manner. Bombay and Delhi Telephones were separated to create the new entity called Mahanagar Telephone Nigam Ltd. (MTNL). On 1st October 2000, Department created BSNL, a new entity to operate services in different parts of the country as a public sector unit.

SERVICES BSNL provides almost every telecom service in India. Following are the main telecom services provided by BSNL:



Universal Telecom Services : Fixed wireline services & Wireless in

Local loop (WLL) using CDMA Technology called bfone and Tarang respectively. As of December 31, 2007, BSNL has 81% market share of fixed lines.



Cellular Mobile Telephone Services: BSNL is major provider of

Cellular Mobile Telephone services using GSM platform under the brand name BSNL Mobile[2]. As of March 31, 2007 BSNL has 17% share of mobile telephony in the country.



Internet: BSNL provides internet services through dial-up

connection (Sancharnet) as Prepaid, (NetOne) as Postpaid and ADSL broadband (BSNL Broadband). BSNL has around 50% market share in broadband in India. BSNL has planned aggressive rollout in broadband for current financial year. Intelligent Network (IN): BSNL provides IN services like televoting, toll free calling, premium calling etc.

SECTIONS The BSNL is divided into following sections: I.

MOBILE SECTION

II.

E-10B SWITCHING

III.

OCB SWITCHING

IV.

MDF

V.

TRANSMISSION SECTION

VI.

MICROWAVE

VII.

POWER STATION

VIII.

BROAD BAND

IX.

COSTUMER CARE

Mobile Section

In this section we learnt how mobile communication takes place. There are two ways by which mobile communication takes place,

GSM CDM A

The Basic Transmission Procedure:

1. BSC: Base Station Controller 2. BTS: Base Station TRANSCEIVER 3. MSC: Mobile Switching Center 4. HLR: Home Location Register 5. VLR: Visitor Location Register 6. AUC: Authentication Center 7. EIR: Equipment Identity Register 8. SC: Short Message Center 9. OMC: Operation and Maintenance Center

E-10B (ELECTRONICS - 10 BINARY) Here we came to know about function of:--

OMC: -- Operation maintenance centre. OC:--Monitoring unit. ETA:--Frequency sender and receiver. URM:--Multiplex connection unit.(5 unit) CSE:--Subscriber connection unit. DSF:--Stand by charge unit. MR:--Multiresistor (5 unit) MQ:--Marker (2 unit) TR:--Translator (2 unit) TX:--Tax (charging unit) (2 unit) RLM:--Remote lining unit. COM:--Switching module. CX: -- Switching unit.

TAX (Trunk auto exchange) This section deals when a caller picks up the receiver, gets the dial tone and how the call is made and processed.

Transmission The call is transmitted from telephone to:

Caller

D.P

Receiver

Pillar

D.P

MDF

Pillar

Exchange

Tax

MDF

Exchange

There are two types of media:  Guided Media (OFC)  Un-Guided Media.

BROADBAND A trend of changes in telecommunication technology is very fast. The need of hour is large bandwidth and its optimum utilization at reasonable cost. Any data access rate more than 2Mbps is considered as broadband access. As per the recent broadband policy of govt. of India, access rate over 256kbps will come under category of broadband access.

Equipment's required in customer premises are

•

Filter:-The filter separates out the signal for telephone. (Called as Splitter)

• Modem:-The modem directs the signal to PC and TV. • Set Top Box (STB)-The STB converts the digital IP based signal to a form compatible with the TV set. • PC and TV

What is DSL ? •

A high speed digital communication line

•

Have several advantages over other high speed communication solutions.

•

DSL runs on existing copper

•

DSL helps carriers reduce congestion on their voice-switching systems

•

Very high speed.

Data Card There are two type of data card: 1. IX data card (speed -144kbps (max)) 2. E-VDO data card (speed - 2Mbps)

OCB EXCHANGE SYSTEM

Salient Features:  OCB stands for organ control bhersion.  Digital switching system developed by CIT ALCATEL of France.  OMC & S/N duplicated.  Varieties of service provided are: basic telephony, ISDN, Mobile, Videotext etc.  Supports different types of signaling system.  Max. no. of junctions may be 60000 and 35 types of cards can be used.  Less space requirement.  Automatic fault recovery and remote monitoring.

 Environmental requirement is not very stringent.

MAJOR UNITS OF OCB SYSTEM: Subscriber Connection Unit (CSN) A CSN basically consists of 1 basic rack and 3 extension racks capacity of CSN is 5000.Subs may be analog and digital.

TRUNK & JUNCTION CONNECTION UNIT (SMT) It is the interface between switching network and junctions from other exchanges (or remote connection unit).

SWITCHING MATRIX The Switching matrix is a single stage ‘t’ made up of host switching matrix and branch selection & amplification function, SMX is duplicated.

AUXILLIARY EQUIPMENT CONTROL STATION (SMA) It consists of frequency receiver/generator conference call CCTS, tone generators etc.

CONTROL UNIT (SMC) The six control units are as under:    

Multi register (MR) for connecting and disconnecting calls. Translator (TR) for storing exchange database. Charging unit (TX) for carrying out charging jobs. Marker (MQ) for performing connection & disconnection of subscribers.  Ccs-7 controller (PC) for carrying out routing & traffic management functions.  Matrix system handler (GX) for monitoring connection in S/N.

OPERATION & MAINTENANCE UNIT (SMM) It is OMC for supervising functions of different units and for taking suitable actions at the event of faults. Magnetic disks each of capability 1.2 GB for various stages.

In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central office is the physical building used to house inside plant equipment including telephone switches, which make phone calls "work" in the sense of making connections and relaying the speech information.

MOBILE COMMUNICATION Mobile phones send and receive radio signals with any number of cell site base stations fitted with microwave antennas. These sites are usually mounted on a tower, pole or building, located throughout populated areas, then connected to a cabled communication network and switching system. The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, normally not more than 8 to 13 km (approximately 5 to 8 miles) away. When the mobile phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its unique identifiers, and can then be alerted by the mobile switch when there is an incoming telephone call. The handset constantly listens for the strongest signal being received from the surrounding base stations, and is able to switch seamlessly between sites. As the user moves around the network, the "handoffs" are performed to allow the device to switch sites without interrupting the call. Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. Many of these sites are camouflaged to blend with existing environments, particularly in scenic areas.

The dialogue between the handset and the cell site is a stream of digital data that includes digitized audio (except for the first generation analog networks). The technology that achieves this depends on the system which the mobile phone operator has adopted. The technologies are grouped by generation. The first-generation systems started in 1979 with Japan, are all analog and include AMPS and NMT. Second-generation systems, started in 1991 in Finland, are all digital and include GSM, CDMA and TDMA. The nature of cellular technology renders many phones vulnerable to 'cloning': anytime a cell phone moves out of coverage (for example, in a road tunnel), when the signal is re-established, the phone sends out a 're-connect' signal to the nearest cell-tower, identifying itself and signaling that it is again ready to transmit. With the proper equipment, it's possible to intercept the reconnect signal and encode the data it contains into a 'blank' phone -- in all respects, the 'blank' is then an exact duplicate of the real phone and any calls made on the 'clone' will be charged to the original account. Third-generation (3G) networks, which are still being deployed, began in 2001. They are all digital, and offer high-speed data access in addition to voice services and include W-CDMA (known also as UMTS), and CDMA2000 EV-DO. China will launch a third generation technology on the TD-SCDMA standard. Operators use a mix of predesignated frequency bands determined by the network requirements and local regulations. In an effort to limit the potential harm from having a transmitter close to the user's body, the first fixed/mobile cellular phones that had a separate transmitter, vehicle-mounted antenna, and handset (known as car phones and bag phones) were limited to a maximum 3 watts Effective Radiated Power. Modern handheld cell phones which must have the transmission antenna held inches from the user's skull are limited to a maximum transmission power of 0.6 watts ERP. Regardless of the potential biological effects, the reduced transmission range of modern handheld phones limits their usefulness in rural locations as compared to car/bag phones, and handhelds require that cell towers be spaced much closer together to compensate for their lack of transmission power.

Some handhelds include an optional auxiliary antenna port on the back of the phone, which allows it to be connected to a large external antenna and a 3 watt cellular booster. Alternately in fringe-reception areas, a cellular repeater may be used, which uses a long distance high-gain dish antenna or yagi antenna to communicate with a cell tower far outside of normal range, and a repeater to rebroadcast on a small short-range local antenna that allows any cell phone within a few meters to function properly.

GSM Global System for Mobile communications (GSM: originally from Groupe Special Mobile) is the most popular standard for mobile phones in the world. Its promoter, the GSM Association, estimates that 82% of the global mobile market uses the standard. GSM is used by over 3 billion people across more than 212 countries and territories. Its ubiquity makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs from its predecessors in that both signaling and speech channels are digital, and thus is considered a second generation (2G) mobile phone system. This has also meant that data communication was easy to build into the system. The ubiquity of the GSM standard has been an advantage to both consumers (who benefit from the ability to roam and switch carriers without switching phones) and also to network operators (who can choose equipment from any of the many vendors implementing GSM). GSM also pioneered a lowcost, to the network carrier, alternative to voice calls, the Short message service (SMS, also called "text messaging"), which is now supported on other mobile standards as well. Another advantage is that the standard includes one worldwide Emergency telephone number, 112. This makes it easier for international travellers to connect to emergency services without knowing the local emergency number. Newer versions of the standard were backwardcompatible with the original GSM phones. For example, Release '97 of the standard added packet data capabilities, by means of General Packet Radio

Service (GPRS). Release '99 introduced higher speed data transmission using Enhanced Data Rates for GSM Evolution (EDGE). GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity. GSM networks operate in four different frequency ranges. Most GSM networks operate in the 900 MHz or 1800 MHz bands. Some countries in the Americas (including Canada and the United States) use the 850 MHz and 1900 MHz bands because the 900 and 1800 MHz frequency bands were already allocated. The rarer 400 and 450 MHz frequency bands are assigned in some countries, notably Scandinavia, where these frequencies were previously used for first-generation systems. GSM-900 uses 890–915 MHz to send information from the mobile station to the base station (uplink) and 935–960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. In some countries the GSM-900 band has been extended to cover a larger frequency range. This 'extended GSM', E-GSM, uses 880–915 MHz (uplink) and 925–960 MHz (downlink), adding 50 channels (channel numbers 975 to 1023 and 0) to the original GSM900 band. Time division multiplexing is used to allow eight full-rate or sixteen half-rate speech channels per radio frequency channel. There are eight radio timeslots (giving eight burst periods) grouped into what is called a TDMA frame. Half rate channels use alternate frames in the same timeslot. The channel data rate is 270.833 kbit/s, and the frame duration is 4.615 ms. The transmission power in the handset is limited to a maximum of 2 watts in GSM850/900 and 1 watt in GSM1800/1900. GSM has used a variety of voice codecs to squeeze 3.1 kHz audio into between 5.6 and 13 kbit/s. Originally, two codecs, named after the types of data channel they were allocated, were used, called Half Rate (5.6 kbit/s) and Full Rate (13 kbit/s). These used a system based upon linear predictive coding (LPC). In addition to being efficient with bit rates, these codecs also made it easier to identify more important parts of the audio, allowing the air interface layer to prioritize and better protect these parts of the signal.

GSM was further enhanced in 1997 with the Enhanced Full Rate (EFR) codec, a 12.2 kbit/s codec that uses a full rate channel. Finally, with the development of UMTS, EFR was refactored into a variable-rate codec called AMR-Narrowband, which is high quality and robust against interference when used on full rate channels, and less robust but still relatively high quality when used in good radio conditions on half-rate channels.

There are five different cell sizes in a GSM network—macro, micro, pico, femto and umbrella cells. The coverage area of each cell varies according to the implementation environment. Macro cells can be regarded as cells where the base station antenna is installed on a mast or a building above average roof top level. Micro cells are cells whose antenna height is under average roof top level; they are typically used in urban areas. Picocells are small cells whose coverage diameter is a few dozen meters; they are mainly used indoors. Femtocells are cells designed for use in residential or small business environments and connect to the service provider’s network via a broadband internet connection. Umbrella cells are used to cover shadowed regions of smaller cells and fill in gaps in coverage between those cells. Cell horizontal radius varies depending on antenna height, antenna gain and propagation conditions from a couple of hundred meters to several tens of kilometers. The longest distance the GSM specification supports in practical use is 35 kilometers (22 mi). There are also several implementations of the concept of an extended cell, where the cell radius could be double or even more, depending on the antenna system, the type of terrain and the timing advance. Indoor coverage is also supported by GSM and may be achieved by using an indoor picocell base station, or an indoor repeater with distributed indoor antennas fed through power splitters, to deliver the radio signals from an antenna outdoors to the separate indoor distributed antenna system. These are typically deployed when a lot of call capacity is needed indoors, for example in shopping centers or airports. However, this is not a prerequisite,

since indoor coverage is also provided by in-building penetration of the radio signals from nearby cells. The modulation used in GSM is Gaussian minimum-shift keying (GMSK), a kind of continuous-phase frequency shift keying. In GMSK, the signal to be modulated onto the carrier is first smoothed with a Gaussian low-pass filter prior to being fed to a frequency modulator, which greatly reduces the interference to neighboring channels (adjacent channel interference).

Network structure The network behind the GSM system seen by the customer is large and complicated in order to provide all of the services which are required. It is divided into a number of sections and these are each covered in separate articles.  





The Base Station Subsystem (the base stations and their controllers). The Network and Switching Subsystem (the part of the network most similar to a fixed network). This is sometimes also just called the core network. The GPRS Core Network (the optional part which allows packet based Internet connections). All of the elements in the system combine to produce many GSM services such as voice calls and SMS

The structure of a GSM network.

Subscriber Identity Module One of the key features of GSM is the Subscriber Identity Module (SIM), commonly known as a SIM card. The SIM is a detachable smart card containing the user's subscription information and phone book. This allows the user to retain his or her information after switching handsets. Alternatively, the user can also change operators while retaining the handset simply by changing the SIM. Some operators will block this by allowing the phone to use only a single SIM, or only a SIM issued by them; this practice is known as SIM locking, and is illegal in some countries. Many operators lock the mobiles they sell. This is done because the price of the mobile phone is typically subsidized with revenue from subscriptions, and operators want to try to avoid subsidizing competitor's mobiles. The locking applies to the handset, identified by its International Mobile Equipment

Identity (IMEI) number, not to the account (which is identified by the SIM card). In some countries such as India, all phones are sold unlocked.

GSM security GSM was designed with a moderate level of security. The system was designed to authenticate the subscriber using a pre-shared key and challengeresponse. Communications between the subscriber and the base station can be encrypted. The development of UMTS introduces an optional USIM, that uses a longer authentication key to give greater security, as well as mutually authenticating the network and the user - whereas GSM only authenticated the user to the network (and not vice versa). The security model therefore offers confidentiality and authentication, but limited authorization capabilities, and no non-repudiation. GSM uses several cryptographic algorithms for security. The A5/1 and A5/2 stream ciphers are used for ensuring over-the-air voice privacy. A5/1 was developed first and is a stronger algorithm used within Europe and the United States; A5/2 is weaker and used in other countries. Serious weaknesses have been found in both algorithms: it is possible to break A5/2 in real-time with a cipher text-only attack, and in February 2008, Pico Computing, Inc revealed its ability and plans to commercialize FPGAs that allow

A5/1 to be broken with a rainbow table attack. The system supports multiple algorithms so operators may replace that cipher with a stronger one.

Base Transceiver Station (BTS) Base Transceiver Station (BTS) is the equipment which facilitates the wireless communication between user equipments (UE) and the network. UEs are devices like mobile phones (handsets), WLL phones, computers with wireless internet connectivity, WiFi and WiMAX gadgets etc. The network can be that of any of the wireless communication technologies like GSM, CDMA, WLL , WAN, WiFi, WiMAX etc. BTS is also referred to as RBS (Radio Base Station), Node B (in 3G Networks) or simply BS (Base Station).

Though the term BTS can be applicable to any of the wireless communication standards, it is generally and commonly associated with mobile communication technologies like GSM and CDMA. In this regard, a BTS forms part of the Base Station Subsystem (BSS) developments for system management. It may also have equipments for encrypting and decrypting communications, spectrum filtering tools (band pass filters) etc. Antennas may also be considered as components of BTS in general sense as they facilitate the functioning of BTS. Typically a BTS will have several transceivers (TRXs) which allow it to serve several different frequencies and different sectors of the cell (in the case of sectorised base stations). A BTS is controlled by a parent Base Station Controller via the Base station Control Function (BCF). The BCF is implemented as a discrete unit or even incorporated in a TRX in compact base stations. The BCF provides an Operations and Maintenance (O&M) connection to the Network management system (NMS), and manages operational states of each TRX, as well as software handling and alarm collection. The basic structure and functions of the BTS remains the same regardless of the wireless technologies.

BROADBAND Broadband in telecommunications refers to a signaling method that includes or handles a relatively wide range of frequencies, which may be divided into channels or frequency bins. Broadband is always a relative term, understood according to its context. The wider the bandwidth, the greater the information-carrying capacity. In radio, for example, a very narrow-band signal will carry Morse code; a broader band will carry speech; a still broader band is required to carry music without losing the high audio frequencies required for realistic sound reproduction. A television antenna described as "normal" may be capable of receiving a certain range of channels; one described as "broadband" will receive more channels. In data communications a modem will transmit a bandwidth of 56 kilobits per seconds (kbit/s) over a telephone line; over the same telephone line a bandwidth of several megabits per second can be handled by ADSL, which is described as broadband (relative to a modem

over a telephone line, although much less than can be achieved over a fiber optic circuit, for example).

In data communications Broadband in data communications can refer to broadband networks or broadband Internet and may have the same meaning as above, so that data transmission over a fiber optic cable would be referred to as broadband as compared to a telephone modem operating at 56,000 bits per second. However, broadband in data communications is frequently used in a more technical sense to refer to data transmission where multiple pieces of data are sent simultaneously to increase the effective rate of transmission, regardless of actual data rate. In network engineering this term is used for methods where two or more signals share a medium.

In video Broadband in analog video distribution is traditionally used to refer to systems such as cable television, where the individual channels are modulated on carriers at fixed frequencies. In this context, baseband is the term's antonym, referring to a single channel of analog video, typically in composite form with an audio subcarrier. The act of demodulating converts broadband video to baseband video. However, broadband video in the context of streaming Internet video has come to mean video files that have bitrates high enough to require broadband Internet access in order to view them. Broadband video is also sometimes used to describe IPTV Video on demand.

In DSL The various forms of Digital Subscriber Line (DSL) services are broadband in the sense that digital information is sent over a high-bandwidth channel above the baseband voice channel on a single pair of wires.

In Ethernet A baseband transmission sends one type of signal using a medium's full bandwidth, as in 100BASE-T Ethernet. Ethernet, however, is the common interface to broadband modems such as DSL data links, and has a high data rate itself, so is sometimes referred to as broadband. Ethernet provisioned over cable modem is a common alternative to DSL

BSNL is in the process of commissioning of a world class, multi-gigabit, multi-protocol, convergent IP infrastructure through National Internet Backbone-II (NIB-II), that will provide convergent services through the same backbone and broadband access network. The Broadband service will be available on DSL technology (on the same copper cable that is used for connecting telephone), on a countrywide basis spanning 198 cities. In terms of infrastructure for broadband services NIB-II would put India at par with more advanced nations. The services that would be supported includes always-on broadband access to the Internet for residential and business customers, Content based services, Video multicasting, Video-ondemand and Interactive gaming, Audio and Video conferencing, IP Telephony, Distance learning, Messaging: plain and feature rich, Multi-site MPLS VPNs with Quality of Service (QoS) guarantees. The subscribe will be able to access the above services through Subscriber Service Selection System (SSSS)portal.

OBJECTIVES 

To provide high speed Internet connectivity (upto 8 Mbps)



To provide Virtual Private Network (VPN) service to the broadband customers



To provide dial VPN service to MPLS VPN customers.



To provide multicast video services, video-on-demand, etc. through the Broadband Remote Access Server (BRAS).



To provide a means to bill for the aforesaid services by either time-based or volume-based billing. It shall provide the customer with the option to select the services through web server



To provide both pre-paid and post paid broadband services.

TECHNICAL CAPABILITY The Broadband Service will be given through the state of the art Multi Protocol Label Switching (MPLS) based IP Infrastructure, which is designed to provide reliable routes to cover all possible destinations within and outside the country. Layer 1 of the network will consist of a high speed Backbone comprising of 24 powerful Core Routers connected with high speed 2.5 Gbps (STM-16) links. The routers are located on the national DWDM network interfacing at STM-16 optical level to provide for high transmission speeds.

Advantage of MPLS over other Technologies

MPLS VPN is a technology that allows a service provider like BSNL to have complete control over parameters that are critical to offering its customers service guarantees with regard to bandwidth throughputs, latencies and availability.

Services available through Broadband 

High speed Internet Access: This is the always-on Internet access service with speed ranging from 256 kbps to 8 Mbps.



Bandwidth on Demand: This will facilitate customer to change bandwidth as per his / her requirement. For example a customer with 256 kbps can change to 1 Mbps during the video Conferencing session.



Multicasting: This is to provide video multicast services for application in distance education, telemedicine etc



Dial VPN Service: This service allows remote users to access their private network securely over the NIB-II infrastructure.



Video and Audio Conferencing:



Content based Services: Like Video on Demand, Interactive Gaming, Live and time shifted TV

BIBLIOGRAPHY  Wikipedia  BSNL

CONCLUSION Training at BSNL helped me to attain knowledge about the various processes involved. It was very informative. I learnt quite a lot about electronic exchange, Internet, WLL, Mobile GSM & 3G, and the basics of processing Exchange. I also got firsthand knowledge of how a Telephone Exchange works. It’s an unforgettable experience for me as it made me get accustomed to the professional environment. It helped me to develop an individual personality and boosted my confidence.