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Jargon Buster
The du Pré Jargon Buster found the following for - HNos 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 Z
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Term
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Explanation
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| H | The H series Recommendations from the ITU-T regard line transmission of non telephone signals | |
| H.261 | Wide area video-conferencing standard at 64Kbit/s to 2Mbit/s. Designed for leased linesand ISDN links | |
| H.320 | The standard that governs images in video conferencing | |
| H/W | A BT term. Hardwired | |
| Hacker | Hacker is a term used by some to mean "a clever programmer" and by others, especially journalists or their editors, to mean "someone who tries to break into computer systems". | |
| Half Duplex | A channel capable of transmitting data in either direction, but only one direction at any one time | |
| Handshake | A pre-defined exchange of signals or control characters between two devices that sets up the conditions for data transfer or transmission. For example, the initial exchange of signals between fax machines before transmitting a document | |
| Hard Disk (HD) | Offers permanent data storage in higher capacities than a floppy disk. Most are permanently sited within a PC or server | |
| Hash | see Checksum. | |
| HD | see Hard Disk | |
| HDB3 | High Density Bi-polar signalling, number 3. A common form of signalling on PRA when delivered by copper from the local exchange | |
| HDLC | High Level Data Control. A standard for the structure of a frame of bits at the data link layer of the OSI seven layer model | |
| HDML | A cellular radio term. Hypertext Device Markup Language | |
| HDSL | High Speed Digital Subscriber Line. A symmetric DSL providing two-way ‘leased line’ capability. Therefore, can be used for web / e-mail hosting as well as fast speed Internet access and other applications. 2.048 Mbit/s over 3 copper pairs with a max distance of 3km. Cannot support PSTN on the same lines – see xDSL, ADSL, DSL Lite & VDSL | |
| Hertz | One Hertz is one complete cycle per second. The abbreviation of Hertz is Hz | |
| HF | A radio transmission term. High Frequency. 3 MHz – 30 MHz | |
| Highjacking | Control of a connection is taken by the attacker after the user authentication has been established. | |
| Hiway | An Internet Service Provider – renamed altohiway in June 2000 | |
| HMAC | Header Message Authentication Codes. HMAC is a hash function based message authentication code that was designed to meet the requirements of the IPSEC working group in the IETF, and is now a standard. | |
| Hook Flash | The term given to momentarily depressing the Switch Hook on a telephone. Also used as a colloquial term for Timed Break Recall, since the effect of Hook Flask is the same | |
| Hook Flash Recall | A colloquial term for Timed Break Recall | |
| Host | A general term for a computer system which executes applications for connected users and devices | |
| Hot Swop | Where items, such as failed cards, can be removed and replaced without having first to turn a system off. Prevents down time by allowing the rest of the system to keep operating without interruption | |
| HSCSD | A cellular radio term. High Speed Circuit Switched Data. One of the standards for high-speed data over GSM type of mobile phones. HSCSD establishes a permanent connection to the data network, which makes it more suitable for applications such as video-conferencing than GPRS, another high speed data technology. HSCSD delivers speeds of 38.4 to 57.6Kbps, slightly more than what can be achieved with a regular fixed telephone system modem | |
| HSSI | A BT term. High Speed Serial interface – an SMDS interface | |
| HTML | Hyper-Text Mark-up Language. The electronic publishing language used for most pages on the Internet | |
| http | Hyper-Text Transport Protocol. Especially relevant to the Internet | |
| Hub | A hub is at the centre of star or token ring networks. It is also at the centre of mixed networks, where different types of computers, such as PC, mini or main frame, may be combined | |
| Hybrid | A colloquial term for a telephone system which can handle both keyphones and POTs | |
| Hz | See Hertz |