jitter in, 396 DOCSIS 1.1, 515 overview of, 390-392 DOCSIS 2.0/2.x, 516 Digital Video Broadcasting. See DVB (Digital Video DOCSIS 3.0, 517 Broadcasting) DOCSIS DSG, 517-518 Digital video recording (DVR), 392 for future cable TV, 521 Direct Broadcast Satellite (DBS), 529 overview of, 513-514 Direct inward dialing (DID) trunk, 108 PacketCable using, 518 Direct outward dialing (DOD) trunk, 108 DOCSIS Set-top Gateway (DSG), 517-518 Direct Sequence Spread Spectrum (DSSS), 571, 642 DoD (Department of Defense), 279 Index DOD (direct outward dialing) trunks, 108 DSLAMs (DSL access multiplexers) Dolby Digital sound, 399 in ADSL deployment, 504-505 Domain Name System. See DNS (Domain Name DSL implementation using, 494 System) in next-generation loop carriers, 471 Domain names DSSS (Direct Sequence Spread Spectrum), 571, 642 DNS and, 280-281 DSUs (data service units), 205-206, 288 importance of, 283-284 DTE (data terminal equipment), 152-154, 202 resolvers for, 281 DTT (digital terrestrial television), 400 servers for, 297 DTV (digital TV) top-level domains, 281-283 VS. analog TV, 390-391, 398 Doppler effects, 555 compression, 393-396 Downloadable games, 704-706 delay and jitter in, 396 DPSK (Differential Phase-Shift Keying), 562 moving to, 398-399 DQPSK (Differential Quadrature PSK), 644 implementations and distribution, 399-402 DR (designated router), OSPF, 261 as next-generation TV, 397 DREN (Defense Research and Engineering Net- overview of, 391-392 work), 279 sound and, 399 DRR (Deficit Round Robin), 297-299 standards, 402-409 DSCP (DiffServ Code Point) Dual Stack, 277 DiffServ using, 300, 444 Duplex transmission, 575 IPv6 with, 276 Duplexing DSG (DOCSIS Set-top Gateway), 517-518 defined, 575 DSL access multiplexers. See DSLAMs (DSL access FDD, 575 multiplexers) in spectrum reuse, 575-576 DSL (Digital Subscriber Line) TDD, 576 ADSL, 49-50, 503-505 DVB (Digital Video Broadcasting) ADSL2, 505-506 defined, 513 ADSL2+, 506-507 DVB-H, 402-403 ADSL2-RE, 507 DVB-MHP, 407-408, 520 characteristics of, 494-498 DVB-T, 402 DLC int