Sms Signaling; Signaling For Sms; Sms-Rcs Signaling Links - Nortel DMS-100 Series Maintenance Manual

SMS signaling

Signaling for SMS

This section describes the signaling protocols that the subscriber module
SLC-96/remote concentrator SLC-96 (SMS-RCS) subsystem uses. The
following sections discuss SMS-RCS signaling format, signaling protocols
and the features the format and protocols support.

SMS-RCS signaling links

The SMS and the RCS exchange information over DS-1 lines that use an
extended super frame format. The DS-1 lines operate at a rate of 1.544
Mbps with a sampling frequency of 8000 frames every second.
The DS-1 link consists of 24 channels. Each channel contains eight bits of
pulse code modulation (PCM) data. A framing bit, also referred to as a
S-bit, appears at the front of the sequence. This framing bit makes sure that
the SMS and the RCS recognize the beginning of each 24-channel sequence.
The system sends 192 bits of information during each 24-channel sequence,
plus a framing bit. This action is referred to as a channel frame.
These channel frames carry speech, signaling or operations information.
The following figure is the format of a DS-1 frame.
DMS-100 Family SMS Maintenance Manual XPM10 and up
3-1