standards and guidelines for communication sites - Radio And ...

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GLOSSARY
British Thermal Unit: A standard measurement of generated energy, typically as heat. (1 BTU
equals 1.055 kJoules of energy.)
Brownout: A long-term under-voltage condition lasting minutes, hours or even days at a time. They
are often intentionally instituted by an electric utility company when peak demand exceeds generating
capacity.
BTU: British Thermal Unit.
Building: For the purposes of this manual, a permanent structure capable of regular human occupancy
built on a foundation that contains communications equipment and related ancillary support systems,
and may contain other unrelated equipment and/or facilities.
Cabinet/enclosure: An enclosure that houses communications equipment and ancillary systems
only. It is designed such that equipment contained within can be accessed without the need for
personnel to enter the cabinet.
Cable ladder: An open steel structure (painted or anodized) suspended from the ceiling that provides
an orderly means of support and routing for wires and cables throughout a communications site. May be
installed inside the building or vertically to guide cables on a tower. All exterior cable ladders should be
constructed of galvanized metal. See Cable runway.
Cable runway: A structure provided for the routing and management of cabling. May be located
below a raised floor, suspended from the ceiling, or mounted on top of equipment racks and/or cabinets.
The term Cable Runway is used in this manual to include both cable ladders and cable trays.
Cable tray: A solid structure, typically constructed of aluminum or fiberglass, suspended from the
ceiling that provides an orderly means of support and routing for wires and cables throughout the
interior of a communications site. See Cable runway.
Caisson: A drilled cylindrical foundation shaft used to transfer a load through soft soil strata to firm
strata or bedrock. The shaft is filled with either reinforced or unreinforced concrete. A caisson may
either be a straight shaft or bell type of installation.
CATV: Cable Television.
CCTV: Closed-Circuit Television.
CEB: Central Electronics Bank
Cellular: A multi-site, low-power full-duplex radio system that interfaces to the PSTN.
Central Electronics Bank: Electronic equipment that provides the interface between the console
dispatch positions and the RF equipment (CEB).
Central Office: The main switching center of a telephone service provider or local exchange carrier
(LEC).
CEPT: European Committee of Post and Telegraphs.
CFC-free: Denotes a refrigerant which does not use chlorofluorocarbons.
CFR: Code of Federal Regulations.
Channel bank: A device that places multiple channels on a digital or analog carrier signal.
Channel Service Unit: A digital DCE used to terminate digital circuits (such as DDS or T-1 lines) at
the customer site. It conditions the line, ensures network compliance with FCC rules, and responds to
loopback commands from the central office.
68P81089E50-B 9/1/05 1-13