Quad 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.

Applications:

Direct Inward Dialing (DID).

Will reproduce on-hook battery reversal for line maintenance.

Quad DID Interface Card (FXO Station side)

Features

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