Huawei 3900 Bts COMPLETE HUAWEI BTS PARTS AND COMMUNICATION ALARMS WILL BE PUBLISHED VERY SOON........ (ADMIN)Features and Functions It shares the BBU, which is the central processing unit, with the BTS3900 to minimize the number of spare parts and reduce the cost. It can be flexibly installed in a small footprint and can be easily maintained It supports multiple frequency bands, such as PGSM900, EGSM900, and DCS1800 It supports the GPRS It supports multiple network topologies, such as star, tree, chain, ring, and hybrid topologies It supports the cell broadcast SMS and point-to-point SMS. A single cabinet supports up to 12 carriers in the maximum cell configuration of S4/4/4.Common Subsystem (1) BBU Control subsystem whose functions are implemented by the BBU(2) DRFU RF subsystem whose functions are implemented by the DRFU(3) DCDU Power subsystem (4) Fan BoxBTS3900 Cabinet and BoardsBSBC(BBU)Universal BBU Subrack Backplane type C (2U)UEIU Universal Environment Interface UnitGTMU GSM Transmission and Management Unit for the BBUUELP Universal E1/T1 Lightning Protection UnitUBFA Universal BBU Fan unit type A (2U)UPEU Universal Power and Environment interface UnitDRFU Double Radio Filter UnitDCDU Direct Current Distribution UnitGATM GSM Antenna and TMA Control ModuleFan box Fan boxFunctions of BBUProvides physical ports between the BTS and the BSC for interaction Provides the CPRI ports for communication with the DRFU Provides the USB port for downloading the BTS software Provides OM channels for connection to the LMT (or M2000) Processes UL and DL data Provides centralized management on the entire BTS system, such as OM and signaling processing Provides the reference clock for the entire system Functions of BSBC BoardClock signal: The BSBC sends the precise clock signals provided by the GTMU to each service processing module as reference clock. Power input: The BSBC distributes the +12 V DC power input provided by the power module to the boards and modules. Low-speed signal management: The BSBC provides the interface for the GTMU to monitor and manage the service board, power, backplane, and fan. High-speed signal management: The BSBC distributes and converges information about data, control, and management of all boards in the baseband unit system Service signal: The BSBC transfers the UL and DL baseband data of the GTMU. Functions of UBFA ModuleFan control board (1) Processes the two-channel 12 V power input by the backplane to provide power for the fan (2) Communicates with the GTMU to control and monitor the fan (3) Detects and adjusts the fan speed (4) Detects the board temperature by the built-in temperature sensor (5)Provides the automatic reset function Fan: performs forced heat dissipation for the entire BBU Functions of UPEU ModuleSupplies power to the boards, modules, and fansIntroduces environment monitoring signals to the BBUReports fault signals, in-position signals, and version information associated with the boards and modulesFunction of GTMU BoardControls, maintains, and operates the BTSSupports fault management, configuration management, performance management, and security managementSupports the monitoring of the fan module and power supply moduleProvides port for terminal maintenanceSupports four E1 inputsProvides CPRI ports for communication with the RF modules Functions of DRFUIt implements the direct frequency conversion technique in the transmit channel, modulates the baseband signals to GSM RF signals. After filtering, amplifying, and combining the RF signals, the DRFU sends the signals to the antenna for transmission. The combining can be performed as required.It receives RF signals from the antenna and performs down-conversion, amplification, analog-to-digital conversion, matched filtering, and Automatic Gain Control (AGC). Then, the DRFU transmits the signals to the BBU for further processing.It controls power and detects the Voltage Standing Wave Ration (VSWR).