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 04-09-2008, 09:31 PM | #1 (permalink) | ||||||||
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Rep Power: 0  Country:  | AT&T 278A Paging Adaptor Question I have 9 zones of paging on an R11 G3si. All of the zones are on TN763D Auxiliary Trunk Cards, with 278A paging adaptors. Here's the issue: Most of the zones are Valcom self amplified speakers. Works great except for a really low level hum 60Hz. Valcom recomends that you short the input leads to kill the hum. Anyone know which jumper swaps the control lead (C1/C2) logic from NC to NO? I can wire up an external relay, but if the on-board contacts can do it, why add the parts? | ||||||||
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