y methods, 319-20 802.11b, 420-3 Propagation time delay, 43 DSSS PHY, 419-20, 421 Properly terminated transmission line, 54 FHSS PHY, 418-19 Properties Descriptor, 107 IEEE 802.11 basic, 418 PropertySet class, 102-3 infrared PHY, 418 Proportional-fair (PF) scheduler, 301 of WCDMA, 308-10 Protocol layers, 156 Piconet, 425 layered communications systems, 158 Picture layer, 518, 519 levels of abstraction, 158 Plain old telephone service (POTS), 166 peer communications, 158 Plane wave, definition of, 21 Protocol stacks, 159 Protocol suites, 159 Platform configuration tool (PCT), 164 Platform-specific analysis, 98-9 PSDU (PHY service data unit), 432 Pseudo-random bit sequence, 419 PLRS (Position Location Reporting System), 117 Public switched telephone network (PSTN), 163 Point of Presence (POP), 160 Pulse code modulated (PCM), 162, 168 Point-to-point (PPP) circuits, 199 Pulse duty factor (DF), 147 Polarisation of electromagnetic wave, 21 Pulse propagation, in transmission line, 52-3 Policy-based management tool, 184 Pulse repetition frequency (p.r.f.), 147 Port class, 104 Pure ARQ protocols, 219 PortSupplier, 104 go-back-N ARQ, 219 Positive acknowledgment (ACK), 217 selective-repeat ARQ, 219-20 Post Office Code Standardization Advisory (POCSAG) stop-and-wait ARQ, 219 numeric paging code, 3 Python, 110, 113 Power, definition of, 147 Power flux density, 147 Power-limited operation, 274 QPSK modulation, 276, 277 Predictive coders, 510 QSIF, 488 Primary Rate Interface, 165 Quadrature amplitude modulation (QAM), 20 Prioritization/CoS (class of service), 184-5 Quadrature Phase Shift Keying (QPSK), 216, 423 Prioritized queuing, 196 Quality of service (QoS), 10, 168, 193, 424 Private Branch Exchange (PBX), 161 audio-video synchronization, 242-3 Private network-to-network interface (PNNI), 169 available bandwidth, adapting to, 242 Probabilistic decoding, 209 combating losses, 241 Progressive transmission, 505 active techniques, 241-42 client-side techniques, 241 Progressive VS. interlaced displays, 464-5 Propagation constant 