IBM 865741Y Handbook - Page 258
IEEE Standard 802.3
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G group address (GADDR). (1) In communications, a multidestination address associated with one or more stations on a network. Contrast with individual address. (2) In Synchronous Data Link Control (SDLC), an address in addition to a specific address that is common to two or more secondary stations. H half-duplex. In data communication, pertaining to transmission in only one direction at a time. Contrast with duplex. hard disk. A rigid magnetic disk such as the internal disks used in the system units of personal-computer systems and in external hard disk drives. hard disk drive. A disk drive that reads and writes data on rigid disks and can be installed in or connected to a computer. hardware. (1) All or part of the physical components of an information processing system, such as computers or peripheral devices. (T) (2) The equipment, as opposed to the programming, of a computer. (3) Contrast with software. HDX. Half-duplex. hexadecimal. Pertaining to a system of numbers to the base 16; hexadecimal digits range from 0 through 9 and A through F, where A represents 10 and F represents 15. hot swap. (1) A hard disk subsystem feature of servers and storage enclosures that enables you to remove and replace hard disk drives without turning off the system. (2) To replace a hard disk drive while the system is turned on. I IEEE. Institute of Electrical and Electronics Engineers. IEEE Standard 802.3. A series of standards that define a type of LAN that uses an access method called carrier sense multiple access with collision detection (CSMA/CD) over cabling of various types. The cabling types defined by the standard are thick coaxial (10BASE5), thin coaxial (10BASE2), unshielded twisted pair (10BASE-T), and optical fiber (10BASE-F). individual address. In communications, an address associated with a particular station on the network. Contrast with group address. initialization. Preparation of a system, device, or program for operation. input/output. Pertaining to a device, process, or channel involved in data input, data output, or both. instruction. A statement that specifies an operation to be 240 Netfinity 3500 User's Handbook