Sms Module - Nortel DMS-100 Series Maintenance Manual

SMS module

The SMS module resides in a subscriber carrier equipment (SCE) frame or a
cabinetized version of the frame and is comprised of two units. Unit 0
occupies the lower shelf; unit 1 occupies the upper shelf. The SCE frame
and its cabinetized version can house up to two SMS modules each. SMS
module 0 refers to the lower two units; SMS module 1 refers to the upper
two units. The SCE frame is shown in the following figure. A comparison
between the SCE frame and the cabinet version is shown in the figure
SMS–RSC configuration.
The SMS is a redundant PM; that is, each unit is able to support call
processing and system control. The units operate in hot standby
configuration; one unit is active while the other unit, called the mate unit, is
on standby. When a fault occurs in the active unit, standby control on the
mate unit takes over. This unit then maintains full control of the links until
the failure is corrected.
The units consist of LGC cards, the pad/ring card, and two unique SMS
cards: the A/B DDL message card and the SLC-96 DS-1 interface card. A
custom local area signaling services (CLASS) modem resource (CMR) card
is also provisioned when CLASS features are provided.
A Universal Tone Receiver (UTR) circuit pack (NT6X92BB) may also be
provisioned. The UTR card provides a dedicated channel for digit collection
during call setup, thereby unloading the network for a portion of call setup
responsibility.
Limitations and restrictions
The following limitations apply to the SMS-RCS subsystem:
The SMS is not supported by the Remote Switching Center.
Intraswitching currently is unsupported.
Emergency stand-alone (ESA) currently is not supported.
DMS-100 Family SMS Maintenance Manual XPM10 and up
SMS hardware 2-3