Hitachi VK-S454R Service Manual page 14

General Description > List of Abbreviations and Terms for Surveillance System
Abbreviation/
Index
Term
M MPEG Moving Picture Experts Group: Standard related to compression of video (movie) and
audio. There are four types of MPEG - MPEG1, MPEG2, MPEG4 and MPEG 7 -
depending on the compression method and image quality.
MPEG2 Moving Picture Experts Group Phase 2: A higher standard of MPEG which is applied to
video (movie) requiring higher quality.
MPEG Audio One of three audio compression standards (layers I-III) defined by MPEG.
Layer II
P PC card Standard card type expansion device that is inserted into a slot for PC card. JEITA and
PCMCIA (Personal Computer Memory Card International Association) are cooperating to
perform standardization. There are three types of cards - TYPE I, II and III - depending
on differences in functions and thickness. The PC card is also referred to as a PCMCIA
card.
R Progressive This CCD image sensor scans an image once to create a one-image signal. Also referred
scan CCD to as a non-interlaced CCD sensor.
Sensor
Protocol Procedure, regulations and conventions for data communications.
RAID Redundant Array of Independent Disks: This technique arrays multiple hard disks and
then uses them as one disk to decentralize accesses, thereby enhancing reliability and
process speed. There are seven types of RAID - RAID0-RAID6.
RJ-45 8-pole, 8-core connector used for communication cable.
RS-232C Recommended Standard 232 version C: One of the serial communication standards
established by EIA. Communication standard for one-to-one connections only. 25-pin or
9-pin D-SUB connectors are used.
RS-485 Recommended Standard 485: One of serial communication standards established by EIA.
This standard complies with multiple-to-multiple connections of up to 32 units. 25-pin D-
SUB connectors are normally used.
S SCSI Small Computer System Interface: A standard for connecting computer and peripheral
devices. The number, First, Ultra, Wide, etc., prefixed or suffixed to SCSI indicates the
data transfer rate and connector specifications.
ScTP Screened Twisted Pair: One type of twisted pair cables. Only the inside of the outermost
sheath in this twisted pair cable is shielded. Noise resistance characteristics are superior
to UTP.
SIF Standard Image Format: This format delivers the resolution of 320 horizontal × 240
vertical pixels.
STP Shielded Twisted Pair: One type of twisted pair cables, with each pair shielded. Noise
resistance characteristics are superior to UTP or ScTP.
SXGA Super eXtended Graphics Array: An expanded specification of XGA, with resolution of
1280 horizontal × 1024 vertical pixels.
T Twisted Pair One type of communication cables: Two sheathed cables are twisted into one pair, which
Cable is further sheathed. 4 pairs of cables twisted and sheathed are normally used for
communication cables.
U UTP Unshielded Twisted Pair: One type of twisted pair cables, without shield. Noise
resistance characteristics are inferior to ScTP.
V VBR Variable Bit Rate: This format of coding audio and video varies the amount of data
depending on the subject image.
VGA Video Graphics Array: The resolution is 640 horizontal × 480 vertical pixels.
Explanation
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