ynchronous Time Division Multiplexing. provides the interface to the network, usually from a STDMX Statistical Time Division Multiplexing central office switch, for digital voice transmission.) Signalling Terminal Equipment. SL-LME Software Load Layer Managment Entity. (Specific Synchronous Transport Module. (Basic carrier mo- type of LME.) dule used within SDH, e.g. STM-1, STM-4 and Service Module. STM-16.) System Management Application Entity. Sidetone Masking Rating. (Measure of talker effects System Management Application Service. of sidetone.) SMASE System Management Applications Service Element. Shielded Twisted Pair. (Cable.) SMATV Satellite Master Television. Signal Transfer Point. Switched Multimegabit Data Service. (High speed Space-Time-Space. (Digital switching method.) packet based standard proposed by Bellcore.) Synchronous Transport Signal. (SONET standard System Management Function. for electrical signals, e.g. STS-1 at 51.84Mbit/s.) System Management Functional Area. Synchronous Transmission crossconnect. (Cross- Structure of Management Information. connect used within SHD.) Short Messaging Service. (GSM feature which allo- Start of Text. (Control character used to indicate the cates channels for voice or data only when needed.) start of data transmission. It is completed by a End Systeme Multiservice par Satellite. (Multi-service of Text character, or ETX.) satellite system. A category of service offered by Switched Virtual Circuit. (Method for establishing EUTELSAT.) any to any virtual circuit link. See also PVC.) Synchronous Multiplexer. Subnetwork Access Protocol. (IEEE protocol which allows non-OSI protocols to be carried within OSI Terminal Adaptor. (Used within ISDN to convert protocols.) between non-ISDN and ISDN references.) Subscriber Network Interface. Telecommunication Authority. Simple Network Management Protocol. (Network TA 84 Telecommunications Act of 1984. (UK.) management system within TCP/IP.) Total Access Communication Systems. (Adaption of Signal to Noise Ratio. AMPS by the U