Avaya Definity TN775B Maintenance Card

Refurbished Definity TN775B Maintenance Card

The TN775B/C boards are used in maintenance and monitor power failure signals
in an EPN cabinet in R7si/r or later. These circuit packs also monitor the
clock, monitor and control the power supplies and battery charger, and
monitor air flow and high temperature sensors. These circuit packs provide
2 serial links to communicate with Expansion Interface (EI) circuit packs,
and provide an RS-232 interface for connection to an administration terminal.
Each circuit pack contains a 3-position switch to control emergency power
transfer.