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The ITU-T standard for multimedia
communications over networks that do not provide a guaranteed quality
of service. This standard provides specifications for workstations,
devices, and services to carry real-time video, audio, and data or any
combination of these elements.
Refer to Simplex.
The process in which to signaling
information systems determines how they will transmit and receive data.
Handshaking can be accomplished with hardware or software.
A magnetic storage device utilizing
one or more spinning platters. Each surface has its own read/write head.
The platters (disks) spin at a very high rate of speed, which creates
an air bearing in which the read/write head hovers close
to but not touching the surface. The read/write heads only contact the
disks when powered down in an area not used to contain data. This is
known as parking. Should the read/write head assembly come into contact
with the spinning platters, an undesirable condition known as a head
crash occurs, which may result in permanent damage and/or data
Hard Disk Interface
A hard disk sub-system needs to interface
with the rest of the system. While there are varieties of interfaces,
two of the most popular in the PC arena are:
- IDE -- Integrated Drive Electronics. The hard
disk has a controller integrated into the structure. Only two IDE drives
can interface on one cable set. One drive utilizes the onboard controller,
and is configured to be the master. The other drive has
its onboard controller turned off, and is configured to be a slave.
This configuration is done with jumpers on the drives, or is chosen
by the cable, and the drives are configured to Cable Select (C/S). Currently,
IDE is the least expensive hard drive solution. While its capabilities
were not close to SCSI, recent innovations have IDE solutions in arenas
that were exclusively the province of SCSI.
- SCSI -- Small Computer Systems Interface. A high
level interface that connects hard drives, scanners, or virtually any
other device with a SCSI interface. SCSI can support up to 7 drives
on an 8-bit card, or 15 drives on a 16-bit card. When utilizing SCSI,
each device gets its own ID number, including SCSI controller itself
(typically ID 7 for the controller). If a SCSI hard drive is booting
the system, it receives ID 0. SCSI has seen a number of performance
enhancements and is still the best option when the maximum possible
data transfer rates are required.
Refer to SCSI, Small Computer System
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