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              Outbreak Magazine Issue #10 - Article 12 of 18
           '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'

Digital Multiplexing System 

By Adeamis

Dms was made by the northern telecom in 1979 
and can be interfaced with the listed switches
1.ESS 1-4
2.Xbar
3.TSPS
4.EAX

The dms was made to be small to have room for other installations
LCM line concentrating module
MDF main distribution frame

DMS are in the Class5 Switching
DMS 100 integrates voice and data in a total business communications system and up to 30,000 lines
DMS-10 for up to 10,800 lines mostly connected with big brother dms 100 or 200 switch
DMS 200 access's 60,000 trunks also serve a AT access tandem function can also control controls Operater-assisted calls
DMS 250 not often used

The Phukin Functions

Call Waiting Lamp

Loop Keys - There are 6 loop keys, each with its associated source and
            destination lamp to indicate the calling and called party states.
Alphanumeric Display
Multiple Directory Numbers
Feature Keys - Up to a total of 42.  Some of them could be used for Speed
               Calling and Paging System.
Incoming Call Identifier
Exclude Source/Exclude Destination - privacy keys
Signal Source/Signal Destination:  Release Source/Release Destination

Console 

Access to paging
Call hold
Call detail entry                      Remote console
Call Selection                         Console display
Camp-on                                Automatic recall
Conference - 6 port                    Two-way splitting
Non-delayed operation                  Attendant transfer
Locked loop operation                  Busy verification of lines
Manual and automatic hold              Multiple console operation
Busy verification of trunks            Switched loop operation
Trunk g
roup busy indication                   Uniform call distribution form queue
Multiple listed directory numbers      Control of trunk group access
Secrecy                                Night service
Serial call                            Speed calling
Lockout                                Delayed operation
Position busy                          Interposition calling
Through dialing


Dms allows BUSINESS's to have 

LCD
Indicators
Call Forwarding
Automatic Line
Call Pick-up
Ring Again - automatically redials busy numbers until they are free
Multiple Directory Numbers
Intercom
Speed Call
Call Transfer/Conference
On-Hook Dialing

Programmable Functions

Automatic Hold
Listen-on Hold
Multiple Appearance Directory Numbers (MADN)
Single Call Arrangement
Multiple Call Arrangement
Privacy Release
Tone Ringing with Volume Control
End-to-End Signaling
Call Park
Make Set Busy
Malicious
Call Trace
Busy Override
Attendant Recall
Call Waiting
Stored Number Redial
Private Business Line
32 Character Alphanumeric Display

wich as you can see most of that shit they use everywhere so dms are very popuLAR

DMS is remote switching with a bunch of remote modules in a bunch of
sizes and capabilities including SXS replacement or growth and Office feature's.  
The use of remote modules give the CO more floor space that would usually be used by the Line Concentrating Modules

Trunk Module

(TM) The Trunk Module - 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 not just with landlines.

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) is 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.

Operator Features

With the use of DMS-200 or DMS 100/200 switch, operator features are available
by the following:

Traffic Operator Position System (TOPS)
Operator Centralization (OC)
Auxiliary Operator Service System (AOSS)

Traffic Operator Position System (TOPS) gives many operator function on inward
and outward calls.  The TOPS integrates the operator system with the DMS-200
or DMS-100/200 toll switch.

One voice and one data circuit are needed for each operator position.  The
voice circuit is connected to a port of a three-port conference circuit.  The
other two ports are connected to the calling and called parties.  The data
circuit is used for a digital modem and is used to transmit data punched in by
the operator to the CCC for processing.

Operator Centralization

Operator Centralization (OC) lets the operator use the services given by the
DMS-200 or DMS-100/200 with TOPS.  With OC operator traffic from surrounding
DMS sites can be routed to a central host site.

                       Operator Centralization Diagram



          Routing                   - - -
         <-----\     DMS-200       | AMA |
                \   Remote TC     / - - -
                 = = = = = = =   /
                | \  ----- ___|_/
                |  \: DMS :   |
                |   : 200 :   |                    Host TC           -----
                |   :     :   |                = = = = = = = =     /| POS |
                |   :  (OC:___|               |   ---------   |   / |- - -|
                |   :     :   |\              |  : DMS-200 :  |  /  |Oper.|
                |    -----\   | \             |  :  (TOPS) :__|_/    -----
                 = = = = = = =   \____________|__:         :  |
          Trib Ope Traffic->\     ____________|__:OC)      :  |
                             \   /            |  :         :  |
          Non-DMS Remote TC     /             |   ---------   |
          = = = = = = = = = = =                = = = = = = = =
         |   --------   -----  |
         |  :  TDM   : :  (OC: |
         |  : Switch : :     : |      -----
         |  :        : : DMS :_|_____: AMA :
         |  :        : : 200 : |      -----
         |  /--------   -----\ |
          = = = = = = = = = = =
          /Routing             \ <-Trib Opr Traffic
          \------->             \

Equal Access

Equal Access (EA) is accessible through DMS switches with the addition of
software packages.  Both Equal Access End Office (EAEO) for the DMS-100 and
Access Tandem (AT) for the DMS-200 provide equal access features.




                Equal Access Network Application




                --------- __________________________________
(Phone)--------| DMS-100 |___________                       |
                ---------            |                      |
           NON-EAEO                  |                      |IC/INC
           --------               --------             /---------\   TO
(Phone)---|        |------------| DMS-200 |------------           ---- IC/INC
           --------              ---------             \---------/   /----->
                                     |                      |
                --------- ___________|                      |
(Phone)--------| DMS-100 |__________________________________|
                ---------



DMS-100 EAEO

The DMS-100 EAEO gives direct access to interLATA (Local Access and Transport
Area) carriers Point of Presence (POP) inside the LATA.  The DMS-200 AT gives
a traffic concentration and distribution function for interLATA traffic
originating  or terminating inside a LATA. It allows the following:

10XXX and 950-1XXX dialing
presubscription dialing
equal access and normal network control signaling
Automatic Number Identification (ANI) on all calls
custom calling services

Common Channel Interoffice Signaling No. 6
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The basis for the CCIS system is the International Consultative Committee on
Telephone and Telegraph (CCITT) No. 6 international standard, which is brought
to its fullest capacity for use in the Stored Program Control (SPC) network of
AT&T.

The CCIS6 network contains a bunch of signaling regions, each having a pair of
interconnected Signal Transfer Points (STP).  The switching systems put into
CCIS6 that connect to STPs are called Serving Offices (SO).

Band Signaling (CCIS-BS) is used on trunk signaling for intertoll-type trunks
using the CCIS network.

Direct Signaling (CCIS-DS) is used for signaling between SPC switching
machines and a Network Control Point (NCP).  At the present time, CCIS6 can
handle Enhanced INWATS Originating Screening Office (OSO), Calling Card
Validation (CCV), Mechanized Calling Card Service (MCCS), and Billed Number
Screening (BNS).  CCIS6 is available with DMS-100/200, DMS-200, and
DMS-100/200 or DMS-200 with TOPS.


CCIS6 Diagram:
                                            NSB        ST
                      ------------         - - - - - - - - - - -
          DTC        |            |      |            -------    |
         - - -  DS30 |    IPML    | DS30 |  - - -    | ||    |   |
--------|     |------|- - - - - - |------|-|     |---| ||    |   |
Digital  - - -       |            |      |  - - -    | ||    |   |
Trunks               |            |      |           | ||    |   |
                     |            |      |            -------    |
                     |            |        - - - - - - -|- - - -
          DTC        |            |          TM         |
  DIG    - - -  DS30 |    NUC     |  DS30   - - -      -----
--------|     |------|- - - - - - |--------|     |----|     |
^        - - -       |Network     |         - - -      -----
CCIS         \        ------------                     Modem
Signaling     \            |
           - - -         -----
AN Links--|     |       | CCC |
           - - -         -----
          Channel
           Bank



Acronyms:

        DIG - Digital
        AN - Analog
        DTC - Digital Trunk Controller
        MSB - Message Switch Buffer
        ST - Signaling Terminal
        TM - Trunk Module
        NUC - Nailed-Up Connection
        IPML - Inter-Peripheral Message Link

Common Channel Signaling (CCS) No. 7 or CCIS7 is a CCS system based on CCITT
No. 7.  CCIS7/CCS7 on the DMS switch consists of two parts:  the Message
Transfer Part (MTP) and the Interim Telephone user Part.  They are compatible
with DMS-100, DMS-200, DMS-100/200, and DMS-100/DMS-100/200 with TOPS.

CCIS7 can't tell the difference between banded and direct signaling.  CCIS7
uses Destination/Origination Point Codes (DPC/OPC) to route back to the
switch.

CCIS7 can handle Automatic Calling Card Service (ACCS), Enhanced INWATS, Local
Area Signaling Services, and Direct Service Dialing Capabilities.

A DMS-100 IBN or SL-100 can remotely serve many locations from the host site.
This is done by a connection through digital transmission facilities which are
set up at remote modules at the subscriber's premises.

Here are some diagrams showing the differences between normal private
telecommunications networks and ESN networks.

                      Normal telecommunications network
                      

           -----               ------
  [Fone]--| SnS |             | SL-1 |-[Fone]
          | PBX |             | PBX  |
           -----               ------
           |  |DOD/DID   DOD/DID|  |
           |   -------   -------   |
           |Tie       | |       Tie|
           |Trunk  ---------  Trunk|
            ------| Class-5 |------
              ----| Centrex |----
             |     ---------     |
             |                   |
             |                   |
             |                   |
           -----  Tie Trunk  ---------
          | SnS | ----------| Class-5 |
          | PBX |           | Centrex |
           -----             ---------
             |                   |
             |                   |
             |                   |
             |                   |
          -------             ------
  [Fone]-| Small |           | SL-1 |-[Fone]
         |  PBX  |           |      |
          -------             ------


                                  ESN Network
                                  ===========
          --------                               ----------
 [Fone]--| Remote |                             | SL-1 PBX |--[Fone]
         | Module |                             | ESN Main |
          --------                               ----------
              |                                       |
              |  DS-1 Facility                        |  DS-1 Facility
              |            --------------             |
               -------->  | Local Class 5|  <---------
           [Fone]---------|    DMS-100   |
                      ----|    IBN/ESN   |-------------
        2W Loop MFIDP |    --------------             | ESN Trunk Group
           or DS-1    |           |                   |     or DS-1
                      |         -----         ---------------
                      |        | CSC |       | Local Class 5 |
                   --------     -----        |    DMS-100    |
                  | SL-100 | <--- DS-1 ----> |    IBN/ESN    |
                   --------     Facility      ---------------
                      |                              |
                      |                              |
                      | DS-1 Facility                | DS-1 Facility
                      |                              |
                   --------                      ----------
          [Fone]--| Remote |                    | SL-1 PBX |--[Fone]
                  | Module |                    | ESN Main |
                   --------                      ----------





Thanks To All The People That Helped To Contribute Any Info You Have On Dms
