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B
Base Station  A land station in the land mobile service. (ITU RR S1.71)
D
Duplex Operation  Operating method in which transmission is possible simultaneously in both directions of a telecommunication channel. (ITU RR S1.126).
E
Emergency  Equipment which is operationally independent of the Main
Equipment  and Standby Equipment, rapidly available for use when required, and used exclusively for the controlled shutdown of an Air Traffic Service in a safe manner.
Equipment Categories Fixed, Stationary, Vehicle, Portable and Hand Held.
Equipment  The use of a combination of Main, Standby and Emergency
Redundancy  equipment to improve the overall system reliability and to ensure the continuity of service.
Equipment Types  Transmitter, Receiver and Transceiver.
F
Fixed Equipment  Fixed equipment is that which is permanently installed at a specific location with external connections for power supplies, antennas, audio (microphone and loudspeaker) connections. e.g. Cabinet or rack mounted equipment.
H
Hand Held Equipment Equipment with integral battery, antenna, PTT key, microphone and loudspeaker, designed to be operated whilst being carried in the hand or worn on the body. Provisions may be made for external connections for antenna, PTT key, microphone, headphone and external power supply or battery pack and desktop cradle or mounting unit, which may enable it to be classified in the Stationary Equipment Category.
L
Land Mobile Service  A mobile service between base stations and land mobile stations, or between land mobile stations. (ITU RR S1.26)
Land Mobile Station  A mobile station in the land mobile service capable of surface movement within the geographical limits of a country or continent. (ITU RR S1.73)
Land Station  A station in the mobile service not intended to be used while in motion. (ITU RR S1.69)
M
Main Equipment  The terms 'Main' and 'Standby' are generally used to describe identical or similar equipment, configured within a system to provide equipment redundancy, in order to improve the overall reliability and to ensure the continuity of service. The terms may also be applied to sub-equipment and modules as well as facilities, functions and services.
P 
Portable Equipment  Equipment with integral battery, antenna, PTT key, microphone and loudspeaker, designed to be operated as a self contained unit either whilst being carried or at a temporary location. Provisions may be made for external connections for antenna, PTT key, microphone, headphone and external power supply or battery pack, which may enable it to be classified in the Stationary Equipment Category. 
Private Business Radio  Term used by the Radiocommunications Agency for Private land Mobile Radio and related services. 
Private land Mobile Radio  Radio equipment and systems in the Land Mobile Service used for the exclusive benefit and solely in the interests of the licensee's business as opposed to Public Mobile Radio equipment and systems which are provided commercially for use by others. 
R 
Radio Service Area  The Radio Service Area is that volume of airspace, bounded by the DOC and a lower height limit within which communications of a specified quality of service are provided. An alternative to defining a lower height limit, where this cannot easily be defined for the whole of the DOC, is to identify areas where the communications quality of service is below that specified. 
S 
Semi-Duplex Operation  A method which is simplex operation at one end of the circuit and duplex operation at the other. (ITU RR S1.127) 
Simplex Operation  Operating method in which transmission is made possible alternately in each direction of a telecommunication channel, for example by means of manual control. (ITU RR S1.125) 
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(25)