Nortel Networks 1000 - Manual (Page 646)

646 NT8D15 E and M Trunk card
•
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/mu 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 change entries and jumper strap settings. All units on the card can
perform the following features:
•
convert transmission signals from analog-to-digital and digital-to-analog
• provide outpulsing on the card: make/break ratios are defined in
software and downloaded at power-up and by software command
• provide 600-ohms balance and termination impedance (2-wire
configuration)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.