Saturday Apr 19, 2014
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H

Word Explanation
h
  1. A simple hypertext markup language. 2. An indication of a hexadecimal number; 09h is hexadecimal 9.
H&K

Hugs and Kisses.

h-menu

Hierarchical menu. A pull-down menu that has sub-menus. The sub-menus are indicated by arrows. Putting the pointer on the item that has an arrow opens up the sub-menu. Sometimes a sub-menu will have arrows leading to sub-sub-menus.

H.225

H.225 is a part of the H.323 set of protocols that form the underlying basis for VoIP applications. Q.931 call signaling, RAS and RTP/RTCP comprise H.225, which also defines message formats for H.323 applications.

H.245

This protocol defines the standards for managing channels in VoIP applications. It delivers the information required for jitter management, encryption and other processes related to multimedia communication. H.245 further facilitates transfer of non-telephone signals.

H.323

The H.323 standard is a part of the series of protocols known as H.32x recommended by the International Telecommunications Union (ITU). This standard is used to specify the components, protocols and procedures that transmit audio, video and data communications over packet networks, including IP-based networks. The initial purpose for developing the H.323 was to ensure consistent transmissions of multimedia packets over LANs. Now, it has evolved as a standard for interoperability and compatibility for applications over VoIP networks. H.323 does not define the LAN or the transport layer that is used to communicate with various LANs. Its scope is limited to the four major components of the Switched Circuit Network (SCN): Terminals, Gateways, Gatekeepers and Multipoint Control Units.

H.323 Protocol

H.323 is a protocol standard for multimedia communications. H.323 was designed to support real-time transfer of audio and video data over packet networks like IP. The standard involves several different protocols covering specific aspects of Internet telephony.

h/w

Hardware; the physical part of a computer system; the machinery and equipment. Software means the programs that tell the computer what to do.

H1-B Visa

H1-B Visas may be used to bring a nonimmigrant worker to the United States if the employee is able to fill a position in a specialty occupation for professional position. The employee must prove that he/she is qualified for the position, holding a foreing degree equivalent to that required in the U.S. The visa can be granted from 1-6 years after which time he/she must reside outside the U.S. for at least one year.

HAAT: Height Above Average Terrain

Height Above Average Terrain (HAAT) is a measure of an antenna's height above average terrain. This value is used by the FCC in determining compliance with height limitations and transmitting powers for high sites.

hack
  1. To use ingenuity and creativity to solve computer programming problems, to overcome the limitations of a system and expand its capabilities. 2. A solution to a programming problem. 3. A clever yet harmless practical joke.
hacker
  1. One who is knowledgeable about computers and creative in computer programming, usually implying the ability to program in assembly language or low-level languages. A hacker can mean an expert programmer who finds special tricks for getting around obstacles and stretching the limits of a system. 2. To some people it means an unconventional programmer or one who is not formally trained, or one who jerry-rigs programs (making temporary fixes that are not well-done). 3. At MIT, a "hack" means a practical joke, especially one that requires intelligence and technological skill to carry out.
hairline rule

A very thin line, often used as a design element in page layouts.

Hairpin

Hairpin implies sending a call back to its source. One of the situations in which this happens is when a call fails to be routed successfully to the destination IP address.

HAK

Hugs And Kisses.

HAL

Hardware Abstraction Layer. A translation protocol in Windows NT for porting NT to another platform.

Half rate

Half rate is a term used in voice codecs in a communications system. Most frame formats are designed to accommodate full and half-rate channels, with the intention of implementing half-rate coding as the technology permits to double system capacity. The half rate codec uses only half of the time-slots in the frame

half-adder

A logic circuit in the arithmetic and logic unit of a computer that adds two one-digit binary numbers, producing a result bit and a carry bit. A half-adder consists of an XOR gate and an AND gate; a full-adder consists of half-adders and other switches.

half-duplex

A communications channel which transmits data in either direction, but only one direction at a time.

half-inch tape

Magnetic tape cartridge drives used for backup with mainframes and minicomputers.

halftone

A reproduction of a grayscale image which uses dots of varying size or density to give the impression of areas of gray.

Hamming code

Hamming code is a well known simple class of block codes capable of detecting up to two errors and correcting one. Although not particularly powerful, they are one of the "perfect" codes in that its standard array has all of the error patterns that can exist for single errors.

hand coding

Writing a program in a programming language, rather than using high-level programming tools to create the program.

Hand Off (Handoff)

Hand Off (handoff) is the process of transferring a call in progress from the current base station to another without interruption as the user moves out of range of the current base station.

Hand Over

Hand Over refers to the passing of a call signal from one base station to the next as the user moves out of range or the network software re-routes the call.

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