ined, 47-48 Physical channels, 217-18 Internet, 49 Index ISDN, 49-51 Receivers, 126-27 mobile, 48 Regeneration, 155-58 paging, 48 Regenerators, 178 PSTN, 7, 48 Remote switching unit (RSU), 43 radio/television, 51 Repeaters, 178 telex, 48 Request for Comments (RFCs), 301 See also Telecommunications network(s) Resource Reservation Protocol Public switched telephone network (RSVP), 331 (PSTN), 7, 48 Return to Zero (RZ), 153-54 modem link over, 263 Rotary dialing, 25-26 overview, 57 Routing, 38-41 today, 56-58 CIDR, 309 Pulse amplitude modulation (PAM), 94, 96 illustrated, 39 IP, 318-19 Quadrature amplitude modulation layer 3, 245 (QAM), 138 numbering plan, 38 16-QAM, 137, 150 protocols, 316-17 64-QAM, 138 selection guidelines, 39-41 Quadrature phase shift keying (QPSK), switching functionality for, 39 136, 137, 149, 279 virtual circuits, 245-46 Quantizing, 96-97 Routing Information Protocol (RIP), 317 distortion, 97 levels, 99 Sampling, 92-96 linear, 99 frequency, 93 noise, 96, 97-99 illustrated, 94 nonuniform, 97, 99-101 rate, 160 Satellite(s) Radio channels, 193-94 mobile systems, 209-10 common control channels, 193-94 transmission, 175-76 dedicated channels, 193, 194 Second generation cellular systems, 203-8 types of, 194 CDMA, 205-7 See also Cellular networks DCS-1800, 204 Radio data system (RDS), 360 GSM, 203 Radio paging, 202-3 JDC, 208 Radio/television networks, 51 NADC, 204-5 Radio transmission, 129-44, 175 PCS, 204 AM, 129-33 PCS-1900, 204 antennas, 143-44 See also Cellular; Cellular networks attenuation, 144 Second generation cordless telephone CW modulation, 129, 149 technology (CT2), 198 electromagnetic spectrum allocation, Security, GSM, 225-27 138-41 Serial transmission, 238-39 FM, 133-35 Service control point (SCP), 55 free-space loss, 141-43 Service management system (SMS), 55 PM, 135-38 Service switching point (SWP), 55 Rate-adaptive DSL (RADSL), 276 Service transfer point (STP), 55 Real-Time Transport Protocol (RTP), Serving GPRS support node (SGSN), 229, 330-31 Introduction to Telecommunications N