IBM 847651U Handbook - Page 334
Synchronous Data Link Control, Contrast with HDX.
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contention by using carrier sense and deference, and resolves contention by using collision detection and transmission. Ethernet uses carrier sense multiple access with collision detection (CSMA/CD). F 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. FDX. Full-duplex. Synonymous with duplex. Contrast with HDX. file. A named set of records stored or processed as a unit. (T) 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. flash memory. See electrically erasable programmable read-only memory (EEPROM). frame. (1) A data structure that consists of fields, predetermined by a protocol, for the transmission of user data and control data. The composition of a frame, especially the number and types of fields, may vary according to the type of protocol. (T) 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. frequency. The rate of signal oscillation, expressed in hertz. 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 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. 300 Netfinity 3000 User's Handbook
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