The Avaya Definity TN775D EPN Maintenance Board will provide users the ability to monitor multiple features for the EPN cabinet in R7si/r or later.

Features:

   - Monitors power failure signals in EPN cabinets

   - Monitors clock

   - Monitors and controls battery charger and power supplies

   - Monitors air flow and temperature sensors

   - Two serial links for communication for the Expansion Interface (EI) circuit packs, also provides an RS-232 interface for connection with an administration terminal

   - 3-position switch to control emergency power transfer

   - Equipped with a new DC to DC power converter

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