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CAP 670  Air Traffic Services Safety Requirements 
14  Radio System Design 
14.1  Communications of a specified quality of service shall be provided within the radio service area appropriate to the services being provided (274). 
14.2  Acceptable Means of Compliance: Evidence to demonstrate that the defined quality of service has been achieved within the radio service area. 
14.3  For Air Traffic Control communications, a combination of radio service area predictions and ground functional tests would be acceptable. For other Air Traffic Services radio service area predictions or limited ground functional tests. 
14.4  Guidance: Quality of service comprises the two aspects of signal (voice or data) quality and availability. Signal quality can be defined by signal to noise ratio or SINAD for analogue systems and by bit error ratio for digital systems. The availability can be defined in terms of a percentage of time and location. 
NOTE 1:Radio system design includes the consideration of location dependent factors such as a clear radio line of sight, location of antenna, antenna type, transmitter power etc... to ensure reliable radio propagation paths are achieved. 
NOTE 2:The quality of service within the radio service area includes the consideration of additional propagation loss due to buildings or other structures obscuring the line of sight between the base station and the mobile station. 
14.5  The antennas shall be installed such as to provide vertically polarised emissions (275). 
15  Equipment Configuration 
15.1  The equipment configuration shall be such as to ensurecommunications appropriate to the service being provided (276).   the  availability  of 
NOTE:  The configuration of equipment includes associated antennas, cables, filters, commutation units and other equipment necessary for the operation of the equipment and systems. 
15.2  Acceptable Means of Compliance: 
15.2.1  Aerodrome Air Traffic Control Servicesemergency equipment redundancy.  -The provision of main, standby and 
15.2.2  Flight Information Servicesredundancy.  - The provision of main and emergency equipment 
15.2.3  Air-Ground Communication Service - The provisionconsidered sufficient for this level of service.  of  main  equipment  is 
NOTE:  Main and Standby equipment may be operated as 'System A' and 'System B' where either may be considered as Main whilst in operational service and the other is considered as Standby, awaiting selection in the event of failure of the Main equipment or when the Main equipment is taken out of service for maintenance. 

16  Power Supply
16.1  For an Air Traffic Control Service, the power supply for the emergency equipment shall be independent of that for the main equipment (277).
16.2  Acceptable Means of Compliance: The independence of the power supplies need only be for a known limited period provided that the MATS Part 2 procedures manage the safety issues this introduces.
16.3  Users shall be provided with an indication of failure of the power supply to the emergency equipment and instructions shall be provided in MATS Part 2 for user actions in the event of failure (278).
16.4  Recommendation: For an Air Traffic Control Service a primary and alternative power supply should be provided to increase the availability of power to equipment and systems in the event of an interruption to one of the power supplies (279). Change over between supplies should be on a 'no break' basis (280). The primary and alternative supplies should be independent of each other for a known period of time (281). An indication of failure for each power supply should be provided to the user and corrective action taken in the event of failure (282). MATS Part 2 procedures should instruct the user of actions necessary in the event of failure (283).
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(28)