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

GLOSSARY CHAPTER 1: INTRODUCTION
CIU: Console Interface Unit.
CO: Central Office.
Combiner: A passive device that allows transmitters on different frequencies to use a single antenna.
Console: A system's dispatch electronics, made up of one or more console operator positions and a
Central Electronics Bank (CEB).
Console Interface Unit: An interface device that provides encryption/ decryption of console audio
signals.
Conventional system: A radio system in which resources are dedicated to a specific frequency.
CPR: Cardio-Pulmonary Resuscitation.
Critical Loads: Devices and equipment whose failure to operate satisfactorily jeopardizes the health
or safety of personnel, and /or results in loss of function, financial loss, or damage to property deemed
critical by the user.
CSA: 1) Abbreviation for Canadian Standards Association. 2) Cross-sectional area (as used for cable
gauge specification in metric system).
CSI: Construction Specification Institute.
CSU: Channel Service Unit.
Daisy chain: Any method of connection whereby the conductors are connected from one chassis,
equipment frame or rack connection point to a second chassis, equipment frame or rack connection
point and on to a third connection point, creating a series arrangement whereby the removal of the
second connection point interrupts the ground path from the first chassis, equipment frame or rack.
Daisy chaining of grounding conductors is not an acceptable method of connection.
Demarcation Point: The telephone or utility point of presence at a facility which divides utility
assets from customer assets and accordingly assigns maintenance responsibilities.
Dip: See “Sag.” Dip is the International Electrotechnical Commission (IEC) term for sag.
Distortion: Any deviation from the normal sine wave for an AC quantity.
DOT: Department of Transportation.
Duplexer: An RF filtering system that separates the transmit and receive frequency, so that equipment
can transmit and receive simultaneously on a single antenna, without affecting other equipment.
DVM: Digital Voltmeter.
E-1: A time division multiplex (TDM) digital link which uses 32 time slots with a speed of 2.048Mb/s
Earth; Earthing: Synonymous with ground; grounding.
EAS: Environmental Alarm System.
Easement: An interest in real property which is owned by another that entitles the holder to a specific
limited use or enjoyment of the owner's property.
EBTS: Enhanced Base Transceiver System.
Effective Radiated Power: The near-field radiated effective power (as opposed to peak envelope
power) of a transmitting antenna. Specifies power radiated less any losses inherent in transmission lines
or antenna coupling.
EGB: External Ground Bus Bar.
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