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Table Of Contents  CertiGuide to Network+
 9  Glossary

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(Page 1 of 3) H.323

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.

Half Duplex

Refer to Simplex.

Handshaking

The process in which to signaling information systems determines how they will transmit and receive data. Handshaking can be accomplished with hardware or software.

Hard Disk

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 loss.

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 Interface.


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