User's Guide

Nortel Networks Confidential
109
About the iBTS
The receive channelizer receives thesix A/Dconverter signals. It processes the data and transmits them
to the CCM.
Other functions
The TRM also performs the clock generation and recovery operation. The clock is recovered from the
link with the CCM and sent to the rTRM board. This board generates the clock signals for the A/D
converters of the receiver branch and the A/D converters of the transmitter branch.
dTRM board functional description
The functions of the dTRM board are the following:
It receives the data samples from the CCM, performs data shaping processing on them, then drives
the three transmit chains with the resulting data samples.
It receives the data samples from the six TRM receive chains, performs data shaping processing on
them, then sends the resulting data samples to the CCM.
It performs OAM operations on the TRM, the MCPAs and the DDMs.
It supplies the rTRM board.
Figure 63
Block diagram of the dTRM board
Note: This figure describes the complete configuration (available for future versions).