Wired Broadband and Related Industry Glossary of Terms with Acronyms As of 13 June 2011 Compiled By: Conrad L. Young, Director, Broadband Technical Strategy

Photograph of 2kW C-Band Satellite Uplink HPA courtesy of MCL, a division of Miteq

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Photograph of 2kW C-Band Satellite Uplink HPA courtesy of MCL, a division of Miteq

Home Phone Line Networking Alliance


Harmonically-related carriers; a cable channel line-up plan where each analog video carrier is a perfect multiple of 6 MHz. This technique is used to mask composite triple beat distortion by zero-beating those distortions with the video carriers. [Arr11]

High strength; refers to breaking strength of strand. [Arr11]

High Speed Data

HyperText Markup Language

HyperText Transfer Protocol

HyperText Transfer Protocol Secure

Device used to connect segments of a network. A hub offers bandwidth on demand to shared resources vs. being fixed to all accessible ports. A signal distribution point for part of an overall system. Larger cable systems are often served by multiple hub sites, with each hub in turn linked to the main headend with a transportation link such as fiber optics, coaxial supertrunk, or microwave. A hardware device that interconnects computers on a Local Area Network and acts as a central distribution point for the communications lines.

Excerpt from ANSI/SCTE 87-1 2008,

Graphic Symbols For Cable Systems Part 1: HFC Symbols


A location used to bring several circuits together and or distribute them. [Arr11]
Corresponds to “color” in everyday use; i.e., red, blue, etc. Black, white and gray do not have hue.

Hughes Galaxy

A domestic U.S. satellite system which provides a range of telecommunications services. [Sat07]

A term used to describe the 60 or 120 cycles per second (cps) sound present in the sound of some communications equipment. Usually hum is the result of undesired coupling to a 60 cycles per second (cps) source or the defective filtering of 120 cycles per second (cps) ripple output of a rectifier. [Arr11]
Hum Bars

A form of interference seen as horizontal bars or black regions passing across the field of a television screen caused by 50 or 60 cycle power. [Arr11]
Hum Modulation
Undesired modulation of the television visual carrier by the fundamental or low- order harmonics of the power supply frequency, or other low-frequency disturbances.


In telephony, a circuit that divides a single transmission channel into two, one for each direction; or conversely, combines two channels into one. [Arr11]
Hybrid Amplifier

Also referred to as CATV Hybrid Amplifier Module or “hybrid”. In cable plant, including HFC networks, a term used to describe an amplifier module made up of transistor amplifier elements combined with passive elements to form a CATV hybrid amplifier module. Usually manufactured using the cable industry specific SOT-115J package developed in original form in 1968 by TRW. The first hybrid amplifiers used within revenue generating cable television networks were Lindsay Broadband enabled trunk, bridger, and line extender amplifiers installed in Belgium in 1973.

Drawing courtesy of “Reliability Considerations in CATV Hybrids”, IEEE Transactions On Cable Television, VOL. CATV-3, NO. 1, January 1978, Al Grant and Jim Eachus, Motorola, Inc.

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