Owner's manual

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