User's Guide

Nortel Networks Confidential
58
UMT/DCL/DD/0002
411--8111--905
Preliminary 01.06/EN october 2001
UMTS01
Figure 31
DDM block diagram
The DDM includes two dc/dc converters dedicated to the main and diversity branches:
one converter supplies TMA and DDM main
the other converter supplies TMA and DDM diversity
T wo VSWR monitors are also included in the DDM: they are able to monitor RF matching between the
antenna and the iBTS.