Maintenance and administration cabinet modules 129particulate filtration. The fans normally run at low speed to minimize noiselevels; however, if a condition of thermal stress occurs, the fans switch tohigh speed.Power Distribution PanelThe PDP provides power for up to 11 cabinets (including the MCAM3),depending on the configuration. The circuit breaker module comprises tworows of 20 center trip circuit breakers, of which, half are connected to theA-feed and half to the B-feed. Each row has 16 30-amp circuit breakersand 4 10-amp circuit breakers. An LED assembly is provided to indicate ifany breakers fail.External power supplyThe MCAM3 cabinet requires one -48 V A-feed, one -48 V B-feed, one 48 VABS feed and one ground feed from the power plant. The external batterysupply is connected through filtered connections to the PDP.Cabinetized Integrated Services ModuleThe CISM cabinet houses shelves for Integrated Services Modules (ISMs),in addition to performing the functions of the Trunk Module (TM) and theMaintenance Trunk Module (MTM).Figure 60CISM componentsCommunication Server 2100Meridian SL-100 Product Guide555-4001-103 20.01 StandardSE09 20 October 2006Copyright © 2006, Nortel Networks Nortel Networks Confidential.
