dTRU Unit Description DESCRIPTION 8/1551-LZA 701 0001 Uen PC1
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dTRU Unit Description Contents 1 dTRU Unit Description 1 1.1 Product Overview 1 1.2 Dimensions 2 1.3 Power Consumption and Heat Generation 2 1.4 Function Description 3 1.
dTRU Unit Description 8/1551-LZA 701 0001 Uen PC1 2010-09-26
dTRU Unit Description 1 dTRU Unit Description The double Transceiver Unit (dTRU) is a 2-TRX replaceable unit. A TRX is a transmitter/receiver and signal-processing unit, which transmits and receives one carrier. Figure 1 1.1 dTRU and dTRU EDGE Product Overview The dTRU is a 2-TRX replaceable unit. A TRX is a transmitter/receiver and signal-processing unit, which transmits and receives one carrier.
dTRU Unit Description Two of the RX antenna terminals are used for 2-branch diversity reception. The dTRU is hardware prepared for 4-branch diversity reception through the remaining two antenna terminals. 1.1.1 Main Functions The dTRU is a distributed main CPU DMCN and its main functions are: 1.1.2 • Transmits and receives radio frequency signals - GMSK, 8-PSK, 16-QAM or 32-QAM modulation • Processes signals Variants There are two dTRU variants available: 1.
dTRU Unit Description 1.
dTRU Unit Description Figure 3 Block diagram of the dTRU with switching relay The TRU consists of the following main blocks: 1.4.1 • CPU system • DSP system • RC system • Radio system CPU System The CPU system is a control unit in the RBS. It consists of a CPU, support logic, memory and logic for handling the interfaces.
dTRU Unit Description 1.4.2 DSP System The DSP system performs all baseband signal processing necessary for one TRX. For downlink, this includes Terrestrial Protocol Handling (TPH), encoding, ciphering and burst generation. For uplink it includes equalization, combining, decoding and TPH. 1.4.
dTRU Unit Description 1.5.1 Signal and Power Interfaces The Y link, CDU TX control bus and connectors are located on the back of the dTRU. 1.5.
