Common Features; Card Interfaces - Avaya Nortel Communication Server 1000 Reference

Common features

The following features are common to all circuits on the NT8D15 E and M Trunk card:
• Analog-to-digital and digital-to-analog conversion of transmission signals.
• Interfaces each of the four PCM signals to one DS30X timeslot in A10 format.
• Transmit and receive SSD signaling messages over a DS30X signaling channel in A10
format.
• Ability to enable and disable individual ports or the entire card under software control.
• Provides outpulsing on the card. Make break ratios are defined in software and down
loaded at power up and by software commands.
• Provides indication of card status from self-test diagnostics on faceplate Light Emitting
Diode (LED).
• Supports loopback of PCM signals to DS30X for diagnostic purposes.
• Card ID provided for auto configuration and determining serial number and firmware level
of card.
• Software controlled terminating impedance (600, 900, or 1200 ohm) two and four-wire
modes.
• Allows trunk type to be configured on a per port basis in software.
• Software controlled 600 ohm balance impedance is provided.
• Isolation of foreign potentials from transmission and signaling circuit.
• Software control of A/µ-Law mode.
• Software control of digit collection.

Card interfaces

The E and M Trunk card passes voice and signaling data over DS-30X loops and maintenance
data over the card LAN link.
The E and M Trunk card contains four identical and independently configurable trunk interface
units (also referred to as circuits). Each unit provides impedance matching and a balance
network in a signal transformer/analog hybrid circuit. Also provided are relays for placing
outgoing call signaling onto the trunk. Signal detection circuits monitor incoming call signaling.
A CODEC performs A/D and D/A conversion of trunk analog voiceband signals to digital PCM
signals.
The four units on the card can operate in the A-Law or the µ-Law companding mode. The mode
is selected by making service change entries. Each unit can be independently configured for
2-wire E and M, 4-wire E and M, and paging trunk types. The trunk type is selected by service
Circuit Card Reference
Functional description
July 2011 435