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Hardware Description and Reference for Avaya ... - Avaya Support

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Figure 91: DC power-distribution unit (J58890CF-2) (front view))<br />

Ground isolation<br />

DC power<br />

distribution<br />

unit<br />

Circuit<br />

breakers<br />

Terminal<br />

block<br />

Ring<br />

generator<br />

psdfdpdu RPY 053097<br />

Each peripheral device that is connected to a system by the asynchronous (EIA) RS-232<br />

interface requires either a 105C, a 105D, or a 116A isolator interface. The interface isolates<br />

ground between the system <strong>and</strong> external adjuncts.<br />

The isolator interface sits behind a processor port network (PPN) control carrier or behind an<br />

expansion port network (EPN) expansion control carrier. The isolator interface is installed at the<br />

RS-232 interface between the peripheral equipment <strong>and</strong> the interface connector.<br />

The following figure shows the power distribution in some MCC1s with small battery, short term<br />

battery holdover. Switch node (SN) carriers require two 649A DC power converters <strong>and</strong> two<br />

cables.<br />

Issue 6 February 2007 411

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