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Satellite communication systems, 169
Satellite radio, 37
SCO, 591
SDH, 190
SDMA, 93
SDP, 601
Service discovery protocol, 601
Serving GPRS support node, 511
Session layer, 228
SGSN, 511
Shannon's theorems, 21
Shared radio system, 154
Short messaging service, 576, 630
Signaling, 143
Signaling in ISDN, 418
Signaling System No. 7, 393
SIM, 468
Simple Mail Transfer Protocol, 282, 341
Simple Network Management Protocol, 283, 289, 353
Simplex communication, 8
Single-mode optical fiber communication system, 187
Sliding window protocol, 287
SMS, 576, 630
SMS bomb, 629
SMTP, 282, 341
SNMP, 283, 289, 353
SNR, 21
SONET, 190
SONET/SDH, 190
Source coding theorem, 7, 22
Source routing, 208
Space division multiple access, 93
Space segment, 171
Speech recognition, 564
Speech synthesis, 554
SS7, 394
SSRC, 535
Statistical time division multiplexing, 86
Steganography, 625, 634
STDM, 86
Stop-and-wait protocol, 286
Subscriber identity module, 468
Surveillance equipment, 627
Surveillance of voice/fax communication, 627
SVC, 207, 423
SWAP, 606
Switch, 136
Switched virtual connection, 207, 423
Synchronous connection-oriented link, 591
Synchronous digital hierarchy, 190
Synchronous optical network, 190
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