Panasonic FP-D250 User Manual page 574

Byte Eight bits forming a unit of data. Usually each byte stores one character.
C
Cache Pronounced cash. Small portion of high speed memory used for temporary
storage of frequently used data. Reduces the time it would take to access that data,
since it no longer has to be retrieved from disk.
Category 3 cable Standard for UTP voice grade cabling specified by the EIA/TIA
568 standard for use at speeds up to I0Mbit/s including 10BaseT Ethernet.
Category 4 Cabling standard specified by EIA/TIA 568 for use with speeds up to
20Mbit/s including 16Mbit/s Token Ring.
Category 5 Cabling standard specified by ElA/TIA 568 for use with speeds up to
100Mbit/s including FDDI (TP PMD), 100BaseT and 100BaseVG-AnyLan, and
potentially ATM at 155Mbit/s.
CCD (Charged Coupled Device) This scanning method uses florescent light to reflect
images off scanned documents and toward an array of photoelectric cells called the
charge coupled device which converts the light and dark portions of the page into
electronic code. CCD scanners must reduce a page size image to fit a CCD array
the size of a postage stamp. To do this, a complex light path consisting of lens and
mirrors is employed.
CCITT (The International Telegraph and Telephone Consultative Committee) Former
name for the ITU-TS (International Telecommunications Union), a Specialized Agency
of the United Nations.
CCITT Study Groups The ITU-TS (formerly the CCITT) operates as a series of
groups considering specialist areas. There are key study groups applicable to
networking and communications such as Study Group VII responsible for data
communications networks and the X series Recommendations and Study Group
XVIII covering digital networks including ISDN.
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