GLOSSARY

  • Trunk Telecommunication Network

    The essential nature of an area trunk communication system is a network switching centre or Trunk Nodes interconnected by multi-channel radio relay links to form a mesh covering the operational area.

    Connected to these Trunk Nodes by multi-channel radio links are local exchanges or Access Nodes and Mobile Subscriber Centrals. The Access Nodes serve groups of static subscribers and the Mobile Subscriber Centrals serve mobile subscribers within their radio coverage.

    All subscribers have the equivalent of the Post Office subscriber trunk dialling service and can be equipped to send data, telegraph or fax messages as well as speech. As distinct from a civil system, each subscriber has a unique constant number which he retains even when moving within an area. In addition, the Access Nodes and the Mobile Subscriber Centrals attach themselves to the nearest Trunk Mode after a move. The Trunk Nodes may also be moved as the situation demands. The switching and routing processes at the Trunk Nodes and the major Access Nodes is computer controlled so that calls between subscribers can be effected quickly and automatically without each user having to maintain knowledge of the network.

    Calls can be automatically routed by alternative paths when a Trunk Node is damaged or is being moved. Present civil networks are not designed for this type of mobility and they have a very limited degree of survivability in the face of major damage.



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