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The TM also uses service circuits such as Multifrequency (MF) receivers,
announcement trunks, and test circuits. Each TM has the ability to interface
30 analog trunks or service circuits to the network over one 32-channel speech
link. The TM is not traffic sensitive so each trunk can carry 36 CCS.
Digital Carrier Module
The Digital Carrier Module (DCM) gives a digital interface between the DMS
switch and the DS-1 digital carrier. The DS-1 signal consists of 24 voice
channels. The DCM takes out and puts in signaling and control information on
the DS-1 bit streams which then makes them DS-30 32-channel speech links. The
DCM can interface five DS-1 lines; 5*24=120 voice channels; into four 32-
channel speech links. The DCM can carry a maximum of 36 CCS of traffic on
each trunk.
Line Module
The Line Module (LM) gives an interface for a maximum of 640 analog lines and
condenses the voice and signaling into two, three, or four DS-30, 32-channel
speech links. Four speech links have the ability to handle 3,700 Average Busy
Season Busy Hour (ABSBH) CCS per LM.
Remote Line Module
The Remote Line Module (RLM) is a LM operating in a remote location from the
DMS host. The RLMs can be located up to 150 miles from the host office,
depending on the transmission facilities.
Digital Trunk Controller
The Digital Trunk Controller (DTC) has the ability to interface 20 DS-1 lines.
Then the DS-1 lines are linked to the network by a maximum of 16 DS-30 speech
links; each trunk is able to handle 36 CCS.
Line Group Controller
The Line Group Controller (LGC) dose medium level processing tasks, with the
ability to use host and remote subscriber line interfaces. The LGC has the
ability to use Line Concentrating Modules (LCMs), Remote Switching Centers
(RSCs), Remote Line Concentrating Modules (RLCMs), and Outside Plant Modules
(OPMs).
The LGC can interface up to 20 DS-30 speech links from the LCMs or up to 20
DS-1 links with the ability to serve RSCs, RLCMs, or OPMs.
Line Trunk Controller
The Line Trunk Controller (LTC) combines the DTC and LGC functions and gives a
way to use all the equipment inside the office. The LTC has the ability to
handle the LCM, RSC, RLCM, OPM, and digital trunk interfaces.
The LTC has the ability to give interfaces to a maximum of 20 outside ports
from DS-30A speech links or DS-1 links to 16 network side DS-30 speech links.
Line Concentrating Module
The Line Concentration Module (LCM) when used with the LGC or LTC is just an
expanded version of the line Module. It can serve up to 640 subscriber lines
interfaced with two to six DS-30A speech links. Using six speech links 5,390
CCS can be handled per LCM.
Remote Switching Center
The Remote Switching Center (RSC) interfaces subscriber lines at a remote
location to a DMS-100 host. It has the ability to handle interface for 5,760
lines and is used a replacements for dial offices or Private Branch Exchanges
(PBXs). It can handle 16,200 CCS with the use of 16 DS-1 links.
The RSC consists of the following:
Line Concentrator Module (LCM) - These modules do line interface function.
They are the same as the LCMs that are used in the DMS-100 host.
Remote Cluster Controller (RCC) - This controller gives DS-1/LCM interface,
Local switching inside the remote, and Local intelligence and signaling when
in ESA.
Remote Trunking - Handles the use of RSC originating or terminating traffic
for digital trunking off the RSC. It can give trunking to a CDO co-located
with the RSC or within the service range of the RSC, Private Automatic Branch
Exchanges (PABXs), or Direct Inward Dialing (DID) trunks.
Remote-off-Remote - Lets the RLCMs and OPMs connect to the RCC through DS-1
interfaces. It lets RLCM and OPM subscribers to use the same lines to the host
as the RSC subscribers.
Emergency Stand-Alone (ESA) - If communication with the DMS-100 is lost this
will allow you to call internal to the RSC. It will give station-to-station
and station-to-trunk calls for POTS, IBN, and electronic business sets.
Remote Line Concentrating Module
The Remote Line Concentrating Module (RLCM) is just a LCM used is a remote
location from the DMS-100 host. The RLCM can handle 640 lines; this can is
sometimes used as a replacement for CDOs or PBXs.
Outside Plant Module
The Outside Plant Module (OPM) is an outside plant remote unit. The OPM can
handle 640 lines over six DS-1 links.