Dual DID Interface Card

The DID interface card is available in two variations:

  • The Quad card isolates up to four lines using a single fiber link.
  • The Dual card can isolate up to two lines using a single fiber link.

The CO side used an FXS interface card. It is powered from an express pair, or from a power source at the CO side (a jumper setting is required for this option). The card interfaces with the CO and provides an off-hook circuit, line polarity detection, ring detection, and battery disconnect detection.

The Station side uses an FXO interface card. This card is powered from the backplane supply of -48 Vdc. It provides battery feed with polarity reversal, ringing, and battery disconnect to the station side equipment.

Product Number CLEI Number Description Download Documents
720740MST, SSC   Quad card isolates up to four lines Specifications Installation Guide
720750MST, SSC   Dual card can isolate up to two lines Specifications Installation Guide

Applications:

Direct Inward Dialing (DID).

Will reproduce on-hook battery reversal for line maintenance.

NOTE: 720750MST, 720750SSC Not compatible with POTS (no ringing detection/generation)

Features

  • Local powered
  • Available as a multi-mode or single-mode card
  • Available with SC or ST connectors

 

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