Avaya Definity TN775D
Maintenance Board Circuit Pack

Avaya Definity TN775D Maintenance BoardThe Avaya TN775D circuit pack is used in maintenance to monitor power failure signals in an EPN cabinet in R7si/r or later. The TN775D also monitors the clock, monitors and controls the power supplies and battery charger, and monitors air flow and high-temperature sensors.

The TN775D circuit pack provides two serial links to communicate with Expansion Interface (EI) circuit packs, and provides an RS-232 interface for connection to an administrative terminal.

Each circuit pack contains a three-position switch to control emergency power transfer.

The TN775D contains a 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.

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Product Description
Avaya TN775D Maintenance Board
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