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H
H-HMMWV - high variant HMMWV
H - height
H.gcp - gateway control protocol
HACMP - high availability clustered multiprocessing
HAEMP - High Altitude Electromagnetic Pulse
HAG - high assurance guard
HAIDE - hostile aircraft identification equipment
HAL - hard array logic
HAL - hardware adaptation (abstraction) layer
HAL - house programmed array logic
Half-Duplex - Transmission occurs in two directions, but not simultaneously.
Handshake - Exchange of predetermined signals occurring when the connection between two data sets is first established.
HARM - high speed anti-radiation missile
HBA - host bus adapter
HCI - human/computer interface
HCJ - heliborne common jammer
HCLOS - high capacity line of sight
HCP - hardcopy printer
HCTR - High-Capacity Trunk Radio
HCU - high capacity computer unit
HCU-2 - high capacity unit-2
HD - hard disk
HD - harmonic distortion
HDA - head disk assembly
HDA - host data adapter
HDB3 (High Density Bipolar, 3 Zero) - A CCITT recommended BNZS coding format. This commonly used version of high-density bipolar (HDB) line coding replaces strings of four zeroes with sequences containing a bipolar violation in the fourth-bit position. Since this coding format precludes strings of zeroes greater than three, it is referred to as HDB3. The encoding algorithm is basically the same as B3ZS. HDB3 line coding is used in CEPT Level-1 digital transmission (2.048 Mbps); thus HDB3 is used with the CEPT Trunk module. Also see zero suppression.
HDB3 - High Density Bipolar 3. An E1 line coding method. This is the more modern line coding method of the two commonly available. See Line Coding, T1. See also AMI and B8ZS
HDCD - high definition compatible digital
HDD - hard disk drive
HDDI - host document data interchange
HDF - hierarchical data format
HDGH - high definition graphic display
HDI - head to disk interference
HDI - high density interconnect
HDL - hardware description language
HDLC (High-Level Data Link Control) - A link level, bit-oriented full-duplex protocol defined by ISO (International Standards Organization). A somewhat universal protocol, it is used in the SCLP channel, and in the ESF data link.
HDM - hardware device module
HDM - hierarchical development methodology
HDSL - high data-rate digital subscriber line (loop) (link)
HDT - high density tape
HDTV - high definition television
HDU - hard disk unit
HDU - helmet display unit
HDUX - half duplex transmission
HDVC - (High Density Voice Compression) Module - This module can receive input from voice modules in 64 kbps PCM (Pulse Code Modulation) format. The HDVC uses Vector Adaptive Predictive Coding (VAPC) at either 16 kbps for a compression ratio of 4:1 or alternatively at 8 kbps for a compression ratio of 8:1.
HDVD - high definition volumetric display
HDX - half duplex
Header - Control information and codes that are appended to the front of a block of user data for control, synchronization, routing, and sequencing of a transmitted data frame or packet.
HEC - header error control
HEL - high energy laser
HELLO - routing protocol
HEMP - high altitude electromagnetic pulse
HEO - highly elliptical orbit
HERF - hazard from electromagnetic radiation to fuel
HERO - hazard from electromagnetic radiation to ordnance
Hertz - (Hz) - A measure of frequency equal to one cycle per second.
HF - high frequency
HF/DF - high frequency direction finding
HF/SSB - high frequency/single-sideband
HFAARS - high frequency adaptive antenna receiving system (Canada)
HFB - high-frequency channel B
HFC - hybrid fiber-coaxial
HFCP - high frequency communications planner
HFEN - high frequency emergency network
HFM - high frequency prediction module
HFPLAN - high frequency planner
HFR - high frequency radio
HHC - handheld computer
HHC - Headquarters and Headquarters Company
HHMMWV - heavy high mobility multipurpose wheeled vehicle
HHMMWV - heavy high mobility multipurpose wheeled vehicle
HHVIT - handheld video imagery terminal
HI - high
HIC - human interaction capability
HICC - hostile intelligence collection capabilities
HIDAD - high density array development
HIDS - headquarters information distribution system (Canadian army)
HIMAD - high to medium altitude air defense
HIMS - human information management system
HIPERLAN - high performance local area network (European)
HIPO - hierarchy of input, processing, and output
HIPPI - high performance parallel interface
HIRF - high intensity radiated fields
HIS - Hypermedia Indexing Schema
HISS - Horizon Infrared Surveillance Sensor
HIT - high interest telecommunication
HITS - Hawaiian information transfer system
HJ - crypto key change
HLA - high level architecture
HLI - high-speed LAN interface
HLL - high level language
HLLAPI - high level language application programming interface
HLOS - horizontal line-of-sight
HLQ - high level qualifier
HMA - hub management architecture
HMD - head (helmet) mounted display
HMI - host message interface
HMMP - HyperMedia Management Protocol
HMMS - HyperMedia Management Schema
HMMWV - high mobility multipurpose wheeled vehicle
HMOM - HyperMedia Object Manager
HMOS - high density metal oxide semiconductor
HMX - home exchange
HN - Home Net
HNSC - House National Security Committee
HOC - cable connector
HOCNET - HUMINT Operational Communications Network
HOIS - hostile intelligence service
HOL - high order language
Hops - The number of nodes through which a call passes before reaching its destination. (Includes only the pass-through and destination nodes, not the origination node).
HOPSEC - hopping security
HOST - Hybrid Open Systems Technology
HOT - health-oriented telecommunications
HP - Hewlett Packard
HPA - high power amplifier
HPC - high performance computing
HPCC - high performance computing (computer) and communications
HPFS - high-performance file system
HPM - high powered microwave
HPOV - Hewlett Packard OpenView
HPPI - high performance parallel interface
HPPP - high performance parallel processor
HPSS - high performance storage system
HPT - high priority target
HQ - headquarters
HRCD - handheld remote controlled device
HRG - high resolution graphics
HRMS - human resource management system
HRR - high resolution radar
HRV - Home Rekey Variable
HS - high-speed
HSBIC - high-speed balanced interface card
HSC - high speed channel
HSCDM - High-Speed Cable Driver Modem
HSD (High-Speed Data) Module - This module provides two independent data ports with V.35 or RS-449/422 interfaces at rates from 9.6 kbps to 1.344 Mbps and RS-232 DCE/DTE interfaces at rates from 9.6 kbps to 19.2 kbps.
HSE - high speed encryption
HSFEC - high speed forward error correction
HSI - hue saturation intensity
HSI - human systems integration
HSI - hyper-spectral imagery
HSIF - hardware/software integration facility
HSLAN - high-speed local area network
HSM - hierarchical storage management
HSM - host security module
HSMUX - high speed multiplexer
HSMUX2 - high speed multiplexer-2
HSPR - high-speed pulse-form restorer
HSS - high-speed shelf
HSS-2 (High-Speed Shelf) - A mechanical assembly (chassis) that contains the SX, T3, and PPM modules in a Promina 800.
HSSDB - high-speed serial data buffer
HSSI - high speed serial interface
HSU - High Speed User
HSV - hue saturation value
HT - heavy terminal
HT/MT - heavy terminal/medium terminal
HTCIA - High Technology Crime Investigative Association
HTI - horizontal technology integration
HTML - HyperText Markup Language
HTTP - HyperText Transport Protocol
HTU - handheld terminal unit
HUD - heads-up display
HUDCLIPS - HUD client information and policy system
HUMINT - human intelligence
Hunt - Group - A group of telephone channels configured so that if the first is busy (engaged) the call goes to the next channel, if that channel is busy it goes to the next channel, etc. Hunt groups may hunt from the highest to the lowest, the lowest to the highest, or on some other arbitrary pattern. But the order of hunting will usually be fixed, beginning with one channel and working through ("hunting") until an unused channel is found. The term may have originated back in the old manual switchboard days when the operator literally hunted for an unused jack to plug a cord into. This arrangement is very common in business scenarios where a single incoming number (the Listed Directory Number) is given to the public, but multiple incoming channels are supported. See LDN
HUS - Hardened Unique Storage
HVA - high voltage assembly
HVPS - high-voltage power supply
HVT - high value target
HWCI - hardware configuration item
HWIL - hardware-in-the-loop
HWS - host workstation
HXTS - external traffic service
Hybrid - 1. A device which converts from a two-wire signal such as POTS lines to a four-wire system (separate send and receive paths) such as used in the pro-audio world. While this task is theoretically quite simple, the fact the impedance of most phone lines varies widely across frequency complicates matters. 2. Mixed data and voice applications.
Hybrid Network - A network that can handle protocols in both public and private network communications. Most private networks today are hybrid networks.
HYDRA - hierarchical yet dynamically reprogrammable architecture
HYTIME - hypermedia/time-based structuring language
Hz - Hertz
HZG - Hertz generator
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