User's Manual

Nortel Networks Confidential
23
About the iBTS
Description of the RF block of the iBTS
The RF block contains the MCPA and the DDM modules. The RF block is common to the iBTS indoor and the
iBTS outdoor. The number of modules depends on the iBTS configuration.
Physical description
The RF block contains the RF modules:
One MCPA shelf that contains six slots. In the three MCPAs configuration, these MCPAs are housed
in slots 1, 3, and 5. There is no electrical backplane in the MCPA shelf: all the interconnection cables
are mounted at the front of the MCPAs.
One DDM shelf that contains three DDMs.
All the cables providing interconnection between the modules are mounted at the front of them.
Figure 13
Front view of the MCPA shelf