Nortel Networks DCT1900 manual Modular Cabinet Connection Board Mccb Roanb 101, Board Description

Technical Product Manual - DCT1900

Installation Instructions, Modular Cabinet Connection Board (MCCB) - ROANB 101 28

CHAPTER 17

Modular Cabinet Connection Board (MCCB) - ROANB 101 28

17.1Board Description

The MCCB (see Fig. 17–3) is installed on the bottom of the Modular Cabinet above the bottom plate. The MCCB is used to make the following interconnections:

zBetween the backplane power and a maximum of 3 CLUs/SLUs for powering Base Stations.

zBetween the external power input and a maximum of 7 CLUs/SLUs for powering Base Stations.

zBetween the PBX signalling ground to a maximum of 7 LTUs when earth signalling is used (instead of timed break signalling).

zBetween the CPU, a PC, and a printer or TAP 1.8 compliant device.

zBetween the general alarm output of the CPU and an alarm device.

A maximum of 3 CLUs/SLUs can be provided with Base Station power via the backplane. In that case the 48V from the backplane is connected to the PW–BP input of the MCCB (see Fig. 17–1). When more CLUs have to be powered, an external -48V power supply can be connected to the PW–EXT input of the MCCB. In this way a maximum of 7 CLUs can be powered.

Install-DCT1900/R8/mw	17-1
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