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Request a Quote TN775D Avaya TN775D EPN Maintenance Board The TN775D is used in maintenance and monitors power failure signals in an EPN cabinet in R7si/r or later. It monitors the clock, monitors and controls the power supplies and battery charger, and monitors air flow and high temperature sensors. It also provides two serial links to communicate with Expansion Interface (EI) circuit packs and provides an RS-232 interface for connection to an administration terminal. The TN775D contains a three-position switch to control emergency power transfer. The TN775D contains a new DC to DC power converter and is used in maintenance to monitor the R7 or later processor in a Survivable Remote Expansion Port Network configuration. Avaya TN775D EPN Maintenance Board