724 NT8D15 E and M Trunkcard
Figure 225 "E and M Trunkcard - block diagram" (page 725) 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 TrunkCard 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 226 "E and M Trunkcard - block diagram" (page 726) 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 226 "E and M Trunkcard - block diagram" (page 726) 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 featuresare common to all circuits on the NT8D15 E and M
Trunkcard:
•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.
•Transmitand 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 upand by software commands.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.