Nortel DMS-100 Series Maintenance Manual page 86

2-2 Signaling for RLCM-EDC
Each DS-1 interface card can accept a maximum of two DS-1 links from the
host LTC+. The RLCM-EDC and the host LTC+ exchange information
over the DS-1 links through dedicated message channels. This signaling
information allows the RLCM-EDC and the host LTC+ to perform the
following tasks:
The DMS-100 switch precedes the RLCM-EDC. The host office handles
signaling between the host and other systems. This process is called
intersystem signaling. The host office handles host to subscriber signaling,
known as operator signaling.
C-side links
The RLCM-EDC requires a minimum of two DS-1 links to the host. These
links are the primary links. The LCM part of the RLCM-EDC requires two
message channels to the host LTC+. The RLCM-EDC uses link access
protocol for D channel (LAPD) messaging on the C-side links to the C-side
LTC+. The links use the extended super frame bipolar 8 bit zero
suppression (ESF8BZS) template required for LAPD messaging.
297-8381-550 Standard 02.02 April 1999
communicate the states of subscriber lines
perform call processing
set up test configurations
pass test results