Signaling For Rlcm-Edc; Signaling And Communications Protocols; Rlcm-Edc Signaling Links - Nortel DMS-100 Series Maintenance Manual

Signaling for RLCM-EDC

Signaling for RLCM-EDC
This section describes the signaling protocols that the Remote Line
Concentrating Module with Extended Distance Capability (RLCM-EDC)
uses. The RLCM-EDC uses the protocols to communicate with the
DMS-100 switch and to provide subscriber services. The following
subsections describe RLCM-EDC signaling and the types of subscriber
services the signaling protocols provide.

Signaling and communications protocols

The RLCM-EDC uses the following protocols for communications and
subscriber services:

RLCM-EDC signaling links

The DS-1 interface cards (NT6X50AB) are in the host interface equipment
shelf. The DS-1 interface cards are the signaling interfaces between the
RLCM-EDC and the host XMS-based peripheral module (XPM). The XPM
is a line trunk controller PLUS (LTC+).
Q.921 CCITT link access procedure on the D-channel (LAPD)
The Q.921 LAPD protocol establishes data link communications
between a service access point identifier (SAPI) and a terminal end point
identifier (TEI). The data link transmits information from a higher layer
protocol, or receives information for delivery to a higher layer protocol.
Q.921 protocol transmits common signal channel (CSC) messages and
embedded operations channel (EOC) messages.
DMS-X
The DMS-X is a half-duplex byte-oriented protocol. The DMS-X is
implemented through a full duplex message channel like the DS-1 or
DS-30A links. The RLCM-EDC processor handles the DMS-X message
protocol on the processor message channels. The DMS-X handles
protocol to the host, remote, or collocated equipment.
DMS-100 Family Maintenance Manual ABSK007
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