IBM 847651U Handbook - Page 334

Synchronous Data Link Control, Contrast with HDX.

Page 334 highlights

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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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
FDX
.
Full-duplex. Synonymous
with duplex.
Contrast with HDX.
file
.
A named set of records stored
or processed as a unit.
(T)
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)
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
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.
300
Netfinity 3000 User's Handbook