 powerlines, 538-541 HSDPA (High-Speed Downlink Packet wired, 543-544 Access) wireless, 541-542 High-Speed OFDM Packet Access (HSOPA), 605 Haptic interfaces, xlix High-Speed Packet Access (HSPA), 605 Hardware, Internet, 251 High-speed portable Internet (HPi), 626 HARQ (hybrid automatic repeat request), 603 High-Speed Uplink Packet Access (HSUPA), HCF (Hybrid Coordination Function), 650 604-605 HD-PLC Ethernet adapter, 540 HiperAccess (High-Performance Radio Access), HDSL (High-Bit-Rate DSL) defined, 49 HiperLan2 (High-Performance Radio LAN 2), G.SHDSL, 501-502 629-630 overview of, 499-500 HiperMAN (High-Performance Radio MAN), 630 HDTV (high-definition TV) Hitless Run, 261 ATSC standards for, 404-405 HLRs (home location registers), 423, 586-587 digital technology and, 391 HMIPv6 (Hierarchical Mobile IPv6), 695 moving to, 398-399 Holographic storage systems, xxxii-xxxiii Health care, and broadband, 388-389 Holostore, xxxii-xxxiii Health issues, and mobile phones, 555 Home agent, Mobile IP, 694-695 Hertz, defined, 13 Home area networks. See HANs (home area Hertz, Heinrich Rudolf, 11, 551 networks) HF (high-frequency) RFID, 679 Home location registers, 423, 586-587 HFC (hybrid fiber coax) architectures Home subscriber servers (HSSs), IMS, 423-424, cable TV networks deployed as, 510 coax cable and, 52-53 HomePlug Powerline Alliance, 539 overview of, 510-511 HomePNA (Home Phone Networking Alliance), HFCPN (high-frequency conditioned power net- 537-538 work), 531 Hop-by-hop routing model, 253 Hierarchical Mobile IPv6 (HMIPv6), 695 Host-to-host protocols, 170 Hierarchical networks, 197 Hosts, 251 High-altitude, long-endurance (HALE) satellite, 72 HPi (high-speed portable Internet), 626 High-Bit-Rate DSL. See HDSL (High-Bit-Rate DSL) HSCSD (High-Speed Circuit-Switched Data), 593 High bit-rate vocoders, 576 HSDPA (High-Speed Downlink Packet Access) High-definition TV. See HDTV (high-definition TV) as competitor to WiBro, 627 High-frequency BFWA, 619-621 for mobile video, 707 High-frequency conditioned power network overvi