\\ More than 3500 Telecom abbreviations maintained by Ioan (Nini) Indreias // 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y All words H Header HA High Availability HAC Hands-Free Add-On Circuit HCDS High Capacity Data Services HCDS High Capacity Digital Services HCM High Capacity Multiplexing HCS Header Check Sequence HCS Hierarchical Cell Structure HCSPR Hundred Call Seconds Per Hour HCV High Capacity Voice HDB3 High-Density Bipolar Three-Bit substitution HDLC High (level) Data Link Control HDLC High level Data Link Control HDML Handheld Device Markup Language HDOP Horizontal Dilution of Precision HDR frame HeaDeR HDS Historical Data Server HDSL High bit rate Digital Subscriber Line HDT Host Digital Terminal HDTM Half-Duplex Transmission Module (X.25) HDTV High Definition Television HDX Half-Duplex HE Head End HE Header Extension (DQDB, SMDS) HE Human Ergonomics HEC Header Error Control HEC Header Error Control (ATM) HEL Header Extension Length (DQDB, SMDS) HEX PPB Handler for External Systems HF/E Human Factors / Ergonomics HF High Frequency HF Human Factors HFC Hybrid Fiber Coax HFC Hybrid Fiber Coaxial cable HFE Hardware Forwarding Engine HFES Human Factors and Ergonomics Society HFR Hardware Failure Rate HFS Hierarchical File Storage HHDLC High-level Data Link Control (ISO) HIBCC Health Industry Business Communications Council HICAP High Capacity Digital Services HID Human Interface Device HILI Higher Layers and Internetworking (IEEE 802) HIP HSSI Interface Processor (Cisco) HIPERLAN High Performance Radio Local Access Network HIPPI High Performance Parallel Interface HIPPI HIgh performance Parallel Processing Interface HLD High Level Design HLFD High Level Functional Design HLL High Level Language HLM Heterogeneous LAN Manager HLPI Higher Layer Protocol Identifier (DQDB, SMDS) HLR Home Location Register HLR Home Location Register (GSM - UMTS) HMA High Memory Area HMAC Hash-based Message Authentication Code HMI Human-Machine Interface HMLP High-speed Multi Layer Protocol HMW High Molecular Weight HNPA Home Numbering Plan Area HO Handover HO High Order HOB Head of Bus (DQDB) HOSTID Host Identifier HP/UX HP's Version of UNIX Operating System HP Hewlett-Packard HPA High Power Amplifier HPAD Host Packet Assembler/Disassembler (BPAD) HPC High Performance Computing HPC High Probability of Completion HPCC High Performance Computing and Communications HPCS High Performance Computing Systems HPFS High Performance File System HPQLOMGC HP Lights-Out Migration Command Line HPQLOMIG HP Lights-Out Migration HPR High Performance Routing HQ Headquarters HS High Speed HSC Hierarchical Storage Controller HSCI High Speed Communications Interface (Cisco) HSCSD High Speed Circuit Switched Data HSLAN High Speed LAN HSM Hardware Security Module (SZ) HSN Hopping Sequence Number HSPSD High Speed Packet Switched Data HSRP Hot Standby Router Protocol (Cisco) HSSI High Speed Serial Interface (ANSI) HT Holding Time HTML HyperText Markup Language HTTP HyperText Transfer Protocol (IETF) HTTP Hypertext Transfer Protocol (Protocol) HTTP HyperText Transmission Protocol HTTPS HTTP Secure HTU-C HDSL Transmission Unit-Central Office HTU-R HDSL Transmission Unit-Remote HTU HDSL Transmission Unit Hz Hertz SMBZ - SaMBoZaur - test for propagation of define: