User's Guide

Nortel Networks Confidential
107
About the iBTS
TRM function al d escription
Generalities
The TRM contains the transmit/receive circuitry for three transmit chains and six receive chains. It
performs:
modulation and demodulation
clock recovery and synchronization
digital--analog and analog--digital conversion
up and down frequency conversion
These functions are performed with the digital and radio boards.
The functional block diagram of the TRM is shown in the following figure:
Figure 62
Functional block diagram of the TRM
Note: This figure describes the complete configuration (available for future versions).