This is a versatile switch which is cost-effective for the duties that it was created for. It is a digital switch that services suburban and rural areas. It is in service internationally as well as in the US (rural and suburban areas). It allows access to local and long-distance service. It can handle up to 12,000 subscribers. It is the smallest of the DMS family.


The purpose of the DMS-100 Switch is to provide coverage and connections to the public network. It is designed to deliver services over subscribers lines and trunks. It provides POTS (Plain Old Telephone Service), along with very sophisticated business services such as ACD (Automatic Call Distribution), ISDN (Integrated Service Digital Network), and MDC (Meridian Digital Centrex).


The DMS-200 switch has toll capabilities, it is used for toll-center applications. It provides TOPS (Telephone Operator Position System) which is the world's premier operator service, from Northern Telcom.


Simply, this combines the DMS-200 Toll capabilities and applications, with the DMS-100 public networking, which makes it possible for this switch to service subscriber lines, long distance circuits with toll applications.


This is the long distance tandem switch that connects long distance calls. It is used by the interexchange carriers. It is powerful, and they are used to connect most of the U.S. population.


This is the international exchange, which gates calls internationally. It provides the most advanced range of international services. This international digital switch can interface with almost *any* country in the world. Talk about power. It is known as the International Gateway System.


This is faster, and can handle more throughput that the DMS-100.

DMS-Supernode SE

This is a reduced size Supernode system, it has a DMS-Core processing engine, DMS-Bus high-speed messaging component, the Link Peripheral Processor (LPP), and the Enhanced Network non-blocking switching network (ENET), which makes it a cost effective system, combined all into one compact unit.

DMS-MTX Cellular Switch

Northern Telecom's Cellular Switch. The DMS-MTX was the first cellular switch in Northern American offered to subscribers.

DMS Architecture & Functionality

  • Messaging - "DMS-Bus" is the high speed data bus connecting most components of the switch. This makes the DMS-Supernode system a true step up communications platform.
  • Switching - The switching matrix calls to their destination. Currently in planning is future switching fabrics that will allow for broader data applications, including (ATM) Asynchronous Transfer Mode.
  • Maintenance & Billing - The DMS Systems provide full feature testing, and other transaction and maintenance procedures.
  • Multicomputing platform - The DMS systems enables a high capacity, and other "information" age applications and functions. Such as Videoconferencing, transmission of imaging, and dialable ds-1 backup.

    DMS Family Setup

    Below will be a simple, common setup of dms systems to form a wide range communications system.

     DMS-100 -----------------  DMS-200   ----------------- DMS-250
    (end office)            /(Tandem office)             (ld services)
                          /                                   |
                        /                                     |
                      /                                       |
                    /                                         |
                  /                                        DMS-300
           DMS-Supernode ---------- DMS-100             (int services)
          (maint,billing)            / | \                    |
                               (subscriber lines)             |
                                                              +--- International

           DMS Applications and Markets
    Switch    Application                 Class      Market
    -------   --------------------------- ---------  -------------------------
    DMS-100   End Office                   5         Local Exchange Carriers
    DMS-200   Toll Office                  4         Local Exchange Carriers
    100/200   End Office/Toll Office       5         Local Exchange Carriers
    DMS-250   Tandem Toll Center          4,3,2,1    Interchange Carriers
    DMS-300   International Gateway      CTI-3,CTX   Int. LD Carriers
    DMS-MTX   Mobile Telephone Center                Cellular Servers
    ACD Srvr  Adjunct ACD Switch                     Local Exchange Carriers