| ITU standard for multimedia and videoconferencing |
| High-capacity ISDN channel operating at 384 kbps | | High-capacity ISDN channel operating at 1.536 Mbps | | ANSI standard for format over IP | | High-Definition Audio-Video Network Alliance | | Home Audio Video Interoperability | | Huffman Codeword Reordering | | Header Check Sequence | | Home Communications Terminal | | Host digital access link | | High Density Bipolar 3 | | High-bandwidth Digital Content Protection | | Home Domain Discovery Service | | High-Level Data Link Control | | High-level Data Link Control (ISO) | | High-Definition Multimedia Interface | | High-Bit-Rate Digital Subscriber Line | | High-bit-rate Digital Subscriber Line | | Host Digital Terminal | | High Definition Television | | High-Definition Television | | Header Error Control | | High End Computing Revitalization Task Force | | Header Extension Processing | | Hexadecimal | | High Frequency (3 MHz to 30 MHz) | | Hybrid Fiber-Coaxial | | Hybrid Fiber/Coax | | Home gateway router | | High-band 8mm video system | | Head-end Interface Converter | | Host InterFace | | High PErformance Radio Local Area Network | | High PErformance Radio Local Area Network One | | High PErformance Radio Local Area Network Two | | Home Integrated Service Unit | | Headend In The Sky | | Home Location Register | | Home Location Register | | Human-Machine Interface | | Home Phoneline Networking Alliance | | High-Performance Computing | | High Performance Computing and Communications | | High Performance Computing and Communications Initiative | | High-Performance Parallel Interface | | High Speed Downlink Packet Access | | Hot Standby Router Protocol | | Home Subscriber Server | | HyperText Markup Language | | HyperText Markup Language 4 | | Harmonized Tariff Schedule of the United States | | Hyper-Text Transfer Protocol | | HyperText Transfer Protocol | | Heating, Ventilation, and Air Conditioning | | Hertz (cycles per second) |
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