Nortel Networks 553-3001-211 Maintenance features, Signaling and call control, Type I signaling

NT8D15 E&M Trunk card Page 629 of 894

•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

Maintenance features

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

Operation

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.

Signaling and call control

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 145 on page 630 shows the trunk signaling orientation for a tandem connection between E&M and CO trunks.

E&M Type I signaling

Figure 146 on page 631 shows E&M Type I signaling patterns for incoming and outgoing calls. Figure 147 on page 632 shows Type I signaling patterns on a tandem connection where the originating end is senderized and the route is over a CO trunk (not applicable to CCSA).

Circuit Card Description and Installation