munications Industry Association bandwidth and, 144-46 (TIA), 13 bit rate and, 146-48 Telecommunications management network unit of, 147 (TMN), 61, 62-65 Symmetric DSL (SDSL), 275-77 actions, 63-64 defined, 275 defined, 62 RADSL, 276 FCAPS functions, 63 VDSL, 276 physical architecture, 63 See also DSL recommendations, 63 Synchronous digital hierarchy (SDH), specifications, 62 166-70 See also Network management data rates, 167 Telecommunications network(s), 47-58 defined, 167 basic, 19-22 of ETSI, 168 complication, 2 multiplexing scheme, 169 illustrated, 21 synchronous transport modules INs, 53-56 (STMs), 169 overview, 19-75 synchronous transport signal level 1 private, 51-52 (STS-1), 169-70 public, 47-51 Synchronous optical network (SONET), signaling, 21-22 169-70 switching, 20-21 data rates, 167, 169-70 transmission, 20 defined, 167 virtual private, 52-53 Synchronous transmission, 239-42 Telegraphy, 4 bit timing information, 241 Telemanagement Forum (TMF), 15 defined, 240 Telephone numbering, 30-33 illustrated, 240 country code, 31-32 See also Asynchronous transmission; hierarchy, 30, 31 Transmission international prefix, 31 operator numbers, 32-33 TCP/IP plane, 38 addressing and multiplexing, 320 subscriber number, 32 defined, 303 trunk code, 32 protocols, 303-4 Telephone operation, 22-24 protocol stack, 260 earphone, 23 Telecommunications illustrated, 23 business development, 15-17 microphone, 22-23 community dependency on, 3 signaling functions, 23-24 defined, 1 Telephone services, 358 future developments, 357-60 Telephony, 4 historical perspective, 3-7 Television, 5 illustrated, 2 Telex network, 48 introduction to, 1-17 Telnet, 328 Introduction to Telecommunications Network Engineering Temporary mobile subscriber identity Transmission channel (TMSI), 227 defined, 126 Terminal multiplexers (TMs), 177 maximum capacity, 148-51 Terrestrial trunked radio (TETRA), 201-2 maximum data rate, 144-51 defined, 201 Transmission Control Protocol (TCP), features, 201-2 319-26 specifications, 202 acknowledgement segments, 3