44 V6100 and V7122 User GuideModule DescriptionFan tray module with six fans and an air filterPower supply moduleV6100 Lifeline Phone LinkThe V6100 Digital with either one or two modules, each with 1 or 2 pairs of spans canprovide a “Lifeline” telephone link. In the event of power failure, a link is provided by theclosing of a metallic switch in the module so that the trunk from the PBX is routed out of themodule to the PSTN.
