The Flexi Multiradio GSM

1. System Module The Flexi Multiradio GSM/EDGE System Module provides baseband capacity for 18 or 36 GSM/EDGE TRXs depending on the version (ESMB or ESMC respectively). Each radio module branch supports up to 6 GSM/EDGE TRXs. Flexi Multiradio BTS are Flexi Mul-tiradio System Module (ESMB/C), RF Module (FXxx)

The main functions of the ESMB/C are: • GSM/EDGE BTS Operation and Maintenance • Abis interfacing • Open Base Station Architecture Initiative (OBSAI) connectivity • Power distribution to other modules • GSM/EDGE baseband • BTS synchronization

External and internal interfaces in ESMB/C are: • 48V DC distribution, 4 outputs and 1 Auxiliary output (5 PWR) • Abis interface (Transmision) • External Alarm and Control Interface • 4 optical interfaces (OBSAI RP3-1)  Kết nối với khối RF (4 Optical RP3 port): mỗi RF module cần 1 Optical RP3 để kết nối. • Auxiliary equipment interfaces • Q1

• Flexi Power Alarms (FPA) • Local Management Port (LMP)

2. RF Module  3-branch radio transceiver, One transmitter and receiver (one branch) can create one sector  It is possible to chain up to 3 radio modules with OBSAI RP3-1  90 W RF Module variants have fixed full band filters

 External and internal interfaces in FXxx are:  48V DC input  External Alarm interface compatible with FPA  3 optical interfaces (OBSAI RP3-1)  6 Antenna interfaces - 3 duplexed and 3 RX diversity  3 cặp  Integrated DC line OVP, Class II rated to 5kA pulse (FXFB, 90 W RF Module variants)  Remote Electrical Tilt (RET) support (FXFB, 90 W RF Module variants)? FXDB và FXEB không có à?

The RF Module (FXxx) includes the following functional blocks: • RF Baseband (RF BB) – RF control • Provides three optical interfaces with the System Module or other RF modules (OBSAI RP3_01) • Provides the external alarm interface • Most of the module internal connections are made through this block • Processes signals and module control functionalities – Transmitter • Direct conversion from TX interface to TX RF • Digital power control • TX Double Power and IDD support – Predistortion transmitter – Receiver

• Dual down conversion from RX RF to RX baseband signal • Diversity reception • Power Amplifier (PA) – Amplifies signal coming from RF BB TX output and feeds it to TX input of the filters • RF Front end – Includes three duplexers and three diversity RX filters with LNAs and RF test loops – Processes air interface RF signals for selected channels – Provides connection for Flexi Antenna Line to Flexi Multiradio Base Station – Supports usage of NSN Masthead Amplifier (MHA) units – Provides the supply voltage to the Flexi Antenna Line units via main antenna branch – Provides the supply voltage for dual MHA unit via diversity antenna branches or two single MHAs via both antenna lines – Contains integrated bias-Ts with over-current and undercurrent alarm detection/protection • Power supply unit (PSU) – Contains power input and distribution of internal supply voltages • Fan assembly • Consists of three separate fans and a fan plate which mechanically mounts to the fan shroud