Here are the most common telecom acronyms starting with H from the world of computer networking.

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Acronym Description
H0 384-kbps channel
H11 1.544-Mbps Channel
HANDS Healthcare Application Network Delivery System
HANS Hardware Answer Indicator
HARI Homegrown Accounts Receivable Interim
HAS Hand-held Access System
HASP Houston Automatic Spooling Program
HASP/MLI Houston Automatic Spooling Program/Multi-Leaving Interface
HATS Hacker Attempt Tracking System
HB Honeywell-Bull
HCDS High Capacity Digital Services
HCLS High Capacity Lightwave Service
HCMR High Capacity Minirecorder
HCMTS High Capacity Mobile Telecommunications System
HCS Hundred Call Seconds
HD High Day
HD (HDX) Half Duplex
HDAM Hierarchical Direct Access Method
HDB High Density Bipolar
HDBH High Day Busy Hour
HDBH High Day Busy Hour
HDBK Handbook
HDFI Host Digital Facilities Interface
HDL Hardware Description Language
HDLC High-level Data Link Control
HDLC Honeywell Data Link Control
HDLTU Host Digital Line Trunk Unit
HDX Half-Duplex
HEHO High End Hop Off
HEP Heterogeneous Element Processor
HEPS High End Proposal System (CN)
HF High Frequency (3 to 30 MHz)
HFDF High Frequency Distribution Frame
HHS Department of Health and Human Services
HIC Hybrid Integrated Circuit
HIOS Headquarters Integrated Office System
HIPAC Hitachi Parametron Automatic Computer
HIPO Hierarchy plus Input-Process-Output
HIPPI High Performance Parallel Interface
HIS Hospital Information System
HLL High-Level Language
HLSC High-Level Service Circuit
HM Human/Machine
HMG Hospitality Market Group (S)
HN Host of Network
HNPA Home Numbering Plan Area
HOBIC Hotel Billing Information Center
HOBIC Hotel Billing Information Center
HOBIS Hotel Billing Information System
HOBIS Hotel Billing Information System
HOC Host Collector
HOPL History of Programming Languages
HP Hewlett-Packard
HPAD High-Level Data Link Control Packet Assembler/Disassembler
HPCC High Performance Computing and Communications
HR Human Resources
HRC Horizontal Redundancy Checking
HRD Human Resources Department
HRIS Human Resource Information System (HR)
HRRS Human Resources Reporting System (HR)
HRSA Health Resources and Services Administration
HSDU High Speed Data Unit
HSLPU High Speed Line Processing Unit
HSM Host Switching Module
HSSI High Speed Serial Interface
HT Holding Time
HTR Hard-to-reach (points or codes)
HTRF Hard To Reach Flag
HTRF Hard To Reach Flag (Northern Telecom Inc. DMS-200)
HUD Department of Housing and Urban Development
HV High Voltage
HVAC Heating, Ventilating, and Air Conditioning
Hz Hertz (cycles per second)

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