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6.2.14 Anti-Blocking Systems (ABS) – Providers must ensure that the installation and operation of such a system will not be detrimental to the integrity or reliability of the communications system (1128). An isolating switch must be provided at the ATC operating position which will effectively remove the ABS from the RTF system (1129). ABS must not be fitted to an emergency RTF system (1130). The received audio volume to the controller must not be affected by the addition of the ABS (1131).
NOTE: An ABS prevents transmissions when the associated receiver is in use. The CAA does not currently propose to make installation of ABS a requirement or a recommendation for Air Traffic Control units.
6.2.15 Comprehensive training shall be provided to both Air Traffic Engineers and Air Traffic Controllers on the possible effects of failures within a communications system which has an ABS fitted (1132). MATS Part 2 and Engineering Instructions are to include this information (1133).
6.2.16 There shall be a visual or other indication to the controller that an ABS system is selected for use (1134).
6.2.17 Recommendation: There should be a visual indication to the controller that the ABS is inhibiting controller transmission (1135).
6.2.18 Recommendation: The duration of a transmission inhibited by an ABS should be detectable on the associated voice recording (1136).
6.3 Ground-Ground Communications
6.3.1 The Provider shall satisfy the CAA that the Aeronautical Fixed Services equipment is adequate for the task for which it is to be used (1137). Among other things, consideration shall be given to reliability, integrity, levels of redundancy, hours of service, classification of airspace and complexity of traffic (1138).
6.3.2 Ground-Ground Communications shall be provided for the telecommunications services required by the air traffic control unit (1139).
6.3.3 There shall be provision for direct and immediate broadcast and break-in interposition communications (intercom) between supervisors/operators at different positions which shall be possible irrespective of the state of other lines of communication (1140).
NOTE 1:A broadcast call is used between one position and all others, whereas a break-in call is only between two positions.
NOTE 2:In some cases it may be necessary to provide an indication of the receipt of an intercom call and to identify the operating position from which the call originated.
6.3.4 Intercom communications shall not be transmitted on any RTF frequency or Ground-Ground Communications (1141).
6.3.5 An adequate number of connection(s) to the public telephone system must be provided (1142).
6.3.6 Other Aeronautical Fixed Services are to be provided as appropriate (1143).
NOTE 1:They may include a means of communicating:
a) Between operational positions within the unit.
b) Directly with adjacent Air Traffic Service units including the parent Area
Control Centre. NOTE 2:In certain circumstances an automated dialling system may satisfy the requirements. Maximum connection times may be specified by the CAA. NOTE 3:The provision of Aeronautical Fixed Services directly into the headsets may be required by the CAA.
6.3.7 Operating positions shall have provision for connection to the Public Switched Telephone Network (1144).
6.3.8 Recommendation: In order to achieve a high availability of communications, the Telecommunications Network access should be duplicated and routing/operator diversity used as appropriate (1145).
NOTE: Access to Telecommunications Network Operators is essential to the implementation of a Ground-Ground Communications network required for the operation of an Air Traffic Control Unit. Access may be via the Public Switched Telephone Network or via private lines and networks.
6.3.9 Recommendation: Where mobile, cellular or personal communications networks are used to fulfil the requirement to access the Public Telecommunications Network, the availability under conditions of congestion should be considered and a priority access facility arranged with the network operator (1146).
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CAP 670 Air Traffic Services Safety Requirements 2(17)
