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Telecoms terms and abbreviations can be a little confusing, even for the most experienced engineers. Here’s a short glossary of some of the terms we use.


Mobility Application Part
The SS7 Protocol layer MAP provides a GSM Network with a mechanism to communicate between its component parts and other networks. It allows MSCs to communicate with VLR,HLR's and BSC's.It provides the underlying signalling for SMS and Location Based services.
Mobile Identification Number
Mobile Switching Center
The switching node of a GSM network is the Mobile Switching Centre. The MSC performs all the switching functions of a fixed-network switching node, e.g. routing path search,signal routing and service feature processing. In addition it has to control allocation of radio resources and subscriber mobility.
Mobile Station ISDN Number
The real telephone number of a GSM subscriber. A mobile subscriber can have many MSISDN numbers - for different services - voice,fax,data
Mobile Station Roaming Number
A temporary location-dependent ISDN number on GSM Networks. It is assigned to the locally responsible VLR to each mobile station in its area.
Message Signalling Unit
Message Transfer Part
Provides physical, data link, and network layer functions. MTP transports information from the upper layers (including the user parts and SS7 applications) across the SS7 network and includes the network management procedures to reconfigure message routing in response to network failures. Refers to level 1 through 3 in the SS7 protocol stack (MTP1-MTP3).
A device used to allow a single communication circuit to take the place of several parallel ones. At the other end of the link a demultiplexer separates the channels.