Nortel Networks 1000 - Manual (Page 642)

642 NT8D15 E and M Trunk card
Figure 209 "E and M Trunk card - block diagram" (page 643) 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.
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.
Figure 210 "E and M Trunk card - block diagram" (page 644) 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.
Figure 210 "E and M Trunk card - block diagram" (page 644) 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.
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.