Nortel DMS-100 Series Maintenance Manual page 26

1-10 Maintenance overview
The UP formulates the SMS messages intended for the CM. The UP directs
the messages. The UP sends the messages through the DS30 cards from the
message and tone card (NT6X69). The CM messages are placed on
channel 0 of DS30 links 0 and 2. The message and tone card extract
messages from the CM and the DS30 interface card. The UP scans the
message and tone card, accesses the messages, and interprets the messages.
The 6X69 and the DS30 card exchange C-side messages over a wired link.
These C-side messages to the network use DS30 protocol. The message and
tone card allows message exchange between the active and inactive SMS
units. The system uses intermodule communication (IMC) protocol to send
messages over a wired link. The section XPM intermodule communication
describes this procedure.
The DS30 cards and the time switch exchange control messages over a
wired link.
The system uses a message channel through the time switch to send control
and state messages to and from the DS-1 cards. The time switch exchanges
one message channel for each DS-1 link with each DS-1 card. Each DS-1
card handles two links, so that each card has two message channels.
The NT6X92 card identifies and processes tones for channels on the parallel
speech bus. Another name for the NT6X92 is the universal tone reciever
(UTE).
The NT6X78 custom local area signaling service (CLASS) modem resource
(CMR) card supports Calling Number Delivery (CND) and other CLASS
services. The CMR card provides the Analog Display Services Interface
(ADSI) protocol to transmit CLASS data between the CM and customer
premises equipment (CPE). The CPE complies with the ADSI protocol.
For more information on CLASS and the CMR card refer to XPM
Translations Reference Manual.
The system processes speech from the RCS to the network the same way as
speech from the network to the RCS. The only difference is that the speech
from the RCS does not pass through the pad/ring cards. A DS-1 card
receives the incoming speech. The time switch removes messages and
signaling bits. The incoming speech switches to the correct C-side channel.
The CSM card adds CSM and parity bits. The formatter card demultiplexes
the incoming speech. The DS30 cards transmit the speech to the network.
297-8231-550 Standard 09.01 August 1998