Nortel Networks 311 Manual Do Utilizador
724
NT8D15 E and M Trunk card
shows a block
diagram of the major functions contained on the E and M Trunk card. Each
of these functions is discussed on the following pages.
of these functions is discussed on the following pages.
The NT8D15 E and M Trunk Card serves various transmission requirements.
The trunk circuits on the card can operate in either A or µ-Law companding
modes. The mode of operation is set by service change entries.
The trunk circuits on the card can operate in either A or µ-Law companding
modes. The mode of operation is set by service change entries.
shows a block
diagram of the major functions contained on the E and M Trunk card. Each
of these functions is discussed on the following pages.
of these functions is discussed on the following pages.
shows a block
diagram of the major functions contained on the E and M Trunk card. Each
of these functions is discussed on the following pages.
of these functions is discussed on the following pages.
Common features
The following features are common to all circuits on the NT8D15 E and M
Trunk card:
Trunk card:
•
Analog-to-digital and digital-to-analog conversion of transmission
signals.
signals.
•
Interfaces each of the four PCM signals to one DS30X timeslot in A10
format.
format.
•
Transmit and receive SSD signaling messages over a DS30X signaling
channel in A10 format.
channel in A10 format.
•
Ability to enable and disable individual ports or the entire card under
software control.
software control.
•
Provides outpulsing on the card. Make break ratios are defined in
software and down loaded at power up and by software commands.
software and down loaded at power up and by software commands.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.