Operation - Nortel Circuit Card Installation Manual

Maintenance features

Operation

Signaling and call control
• monitor signals from the trunk interface and generate a message when
required for each state change
• control disabling and enabling of unit or card
• control A-Law and µ-Law operation modes
• control transmission pad settings
The following features are provided for maintenance of the E&M trunk:
• indication of card status from self-test
• software enable and disable capability for individual units or entire card
• loopback of PCM signals to DS-30X for diagnostic purposes
• card ID for autoconfiguration and determination of serial number and
firmware level
The optional applications, features, and signaling arrangements for each unit
on the E&M trunk card are assigned through the Trunk Administration LD 14
and Trunk Route LD 16 programs.
The information in this section describes the signaling and call control of
E&M Type I and II trunks. The call is terminated and the trunk released by a
disconnect message sent to the associated unit.
Figure 148 on page 642
connection between E&M and CO trunks.
E&M Type I signaling
Figure 149 on page 643
and outgoing calls. Figure 150 on
on a tandem connection where the originating end is senderized and the route
is over a CO trunk (not applicable to CCSA).
NT8D15 E&M Trunk card
shows the trunk signaling orientation for a tandem
shows E&M Type I signaling patterns for incoming
page 644 shows Type I signaling patterns
Circuit Card
Page 641 of 906
Description and Installation