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Dataset card Data Studio Files
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Remote Line Concentrating Module (RLCM) - Ability to handle up to 640 lines.
It uses host Line Concentrator Module (LCM) that can be used by the RSC or
directly by the host DMS-100.
Outside Plant Module (OPM) - Ability to handle up to 640 lines. This also can
be used by the RSC or directly by the host DMS-100.
Subscriber Carrier Module (SCM-100) - There are three basic types of
SCM-100's:
1- Subscriber Carrier Module Rural (SCM-100R) - This eliminates the central
office Central Control Terminal (CCT) by integrating directly into the
DMS-100 through the DMS-1 span lines.
2- Subscriber Carrier Module SLC-96 (SCM-100S) - This gives a direct
interface between DMS-100 and AT&T's SLC-96 digital loop carrier
systems.
3- Subscriber Carrier Module Urban (SCM-100U) - It's used as an interface
to the DMS-1 Urban. The DMS-1 urban is a digital subscriber carrier
system modified for use in Urban areas. It gives Plan Ordinary
Telephone Service (POTS) and special services between a central office
and residential and business communities. It has the ability to handle
576 lines of POTS and special services.
DMS-200 - Has the ability to handle from a few hundred to 60,000 trunks. This
switch can also serve a Access Tandem (AT) function. The Traffic Operator
Position System (TOPS) puts operator services into the DMS-200. Operator
Centralization (OC) allows a single operator location by using the TOPS
positions to transfer operator services from other DMS-200 toll centers. The
Auxiliary Operator Services System (AOSS) let operator services on calls that
need outside information (Such as Directory assistance).
DMS-100/200 - Allows local and toll features described above but also includes
a Equal Access End Office (EAEO)/Access Tandem (AT) combination. It has the
ability to handle up to 100,000 lines or 60,000 trunks.
DMS-250 - This is a high capacity toll system for specialized common carriers
needing tandem switching operations.
DMS-300 - This is a toll system designed for international use. To my
knowledge there are only two DMS-300 switches in use at this time.
DMS switches are divided into four "Functional" areas designed to do certain
operations. These areas are:
1- Central Control Complex (CCC)
2- Network (NET)
3- Peripheral Modules (PM)
4- Maintenance and Administration (MAP)
Here's a description of those areas.
Central Control Complex
Within the Central Control Complex (CCC), the main program in the switch
controls the processing of calls, maintenance and administrative routines, and
changes the activity for these routines to other areas of the switch. The CCC
sends messages to the network, the maintenance and administrative areas trough
message links and directs the functions to be run in those areas.
Network
The Network Modules (NMs) handle the routing of speech paths between the
Peripheral Modules (PMs) and keep these speech connections for the rest of the
call. The network handles message and speech links between the PMs and the
CCC.
Maintenance and Administration
Within the Maintenance and Administration includes Input/Output Controllers
(IOCs) - IOCs interface local or remote input/output devices. The I/O devices
are used to do testing, maintenance, or administrative functions for the
system.
Peripheral Modules
Peripheral Modules (PMs) are used as interfaces between digital carrier spans
(DS-1), analog trunks, and subscriber lines. The PMs are used for scanning
lines for changes of circuit state, doing timing functions used for call
processing, creating dial tones, sending, receiving signaling, and controlling
information to and from the CCC, and checking the network.
Before 1984 only four types of PMs gave trunk interfaces to the DMS system;
these include Trunk Modules (TMs), Digital Carrier Modules (DCMs), Line
Modules (LMs), and Remote Line Modules (RLMs). Since then ten more have been
added, these include Digital Trunk Controller (DTC), Line Group Controller
(LGC), Line Trunk Controller (LTC), Line Concentrating Module (LCM), Remote
Switching Center (RSC), Remote Line Concentrating Module (RLCM), Outside Plant
Module (OPM), Subscriber Carrier Module Rural (SCM-100R), Subscriber Carrier
Module SLC-96 (SCM-100S), and Subscriber Carrier Module Urban (SCM-100U).
Here's and explanation of those modules:
Trunk Module
The Trunk Module (TM) changes incoming speech into digital format, it has the
ability to handle 30 analog trunks. The Pulse Code Modulation (PCM)
information is combined with the trunks supervisory and control signals then
transmitted at 2.56 Mb/s over speech links to the network.