Opac Signaling; Signaling For Opac; Opac Signaling Links - Nortel DMS-100 Series Maintenance Manual

OPAC signaling

Signaling for OPAC

This section describes the signaling that OPAC uses to communicate with
the DMS-100 switch and provide subscriber services. The following
subsections discuss OPAC signaling protocols and the types of subscriber
services that the OPAC signaling protocols support.

OPAC signaling links

The DS-1 interface cards (NT6X50AA, AB) are in the host interface
equipment shelf. The DS-1 interface cards are the signaling interface
between the OPAC and the host XMS-based peripheral module (XPM). The
XPM can be a line group controller (LGC), a line trunk controller (LTC), or
the remote cluster controller (RCC) of a Remote Switching Center (RSC).
Each DS-1 interface card can accept a maximum of two DS-1 links from the
host XPM. A minimum of two and a maximum of six DS-1 links can
connect OPAC equipment to the DMS-100 switch. Six provisionable DS-1
links can connect operating company-configured systems to DMS-100.
The OPAC and the host XPM exchange information over the DS-1 links
through dedicated message channels. The exchange of information, or
signaling information, allows the OPAC and the host XPM to communicate
the states of subscriber lines. The exchange of signaling information allows
the host XPM to execute call processing, arrange test configurations and
pass test results.
The OPAC is subordinate to the DMS-100 switch. The host office handles
all intersystem signaling between the host and other systems, and operator
host to subscriber signaling.
Message channels
The OPAC requires a minimum of two DS-1 links to the host. These links
are the primary links. The LCM section of the OPAC requires two message
channels to the host XPM.
The LCM message channels occupy channel 1 on each of the primary DS-1
links to the host. The remote maintenance module (RMM) requires two
DMS-100 Family OPAC Maintenance Manual XPM12 and up
4-1