Maintenance Overview; Introduction; Functional Overview - Nortel DMS-100 Series Maintenance Manual

Maintenance overview

Introduction

The Remote Line Concentrating Module with Extended Distance Capability
(RLCM-EDC) is a remote peripheral that provides extended geographic
coverage for the Digital Multiplex System-100 (DMS-100) switch. The
RLCM-EDC is configured to operate at a distance of 1,500 to 2,000 miles
from the host office with a maximum engineered one-way path delay of up
to 20 milliseconds.
The RLCM-EDC contains hardware and software maintenance components
that perform routine audits and identify malfunctions in the following:

Functional overview

The RLCM-EDC provides an interface for two to six DS-1 links from a Line
Trunk Controller PLUS (peripheral life upgrade strategy, LTC+) and, in a
non-blocking configuration, up to 140 electronic business sets (EBS)
connected locally. Refer to PLN-8991-104 for NT6X21 EBS provisioning
information.
The host LTC+ is modified with an NTMX76BA card replacing the
NT6X69 messaging card. The NTMX76BA is a new messaging card that
supports High-level Data Link Control (HDLC), International
Telecommunication Union-T Link Access Protocol on D channel ( ITU-T
Q.921 LAPD) to the RLCM-EDC, which is provisioned with the new
NT6X51BA LCM processor card. The LTC+ and RLCM-EDC are
provisioned with NT6X50AB DS-1 interface cards to support the extended
super frame (ESF) transmission format. The DS-1 channels are configured
for clear channel 64 kilobits per second (64 kbit/s) service using the bipolar
8-bit zero substitution (B8ZS) channel coding method. Refer to figure
"RLCM-EDC to LTC+ hardware configuration" for a view of the modified
peripherals.
RLCM-EDC
DS-1 links that connect the RLCM-EDC to the host controller
subscriber lines
DMS-100 Family Maintenance Manual ABSK007
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