CONTENTS

 1     System capacity
 2     Start-stop channel inputs
 3     Start-stop channel outputs
 4     Multiplexing details
        4.4     Alternative A
        4.5     Alternative B
 5     Frame structure
        5.5     Alternative A
        5.6     Alternative B
 6     Synchronizing
        6.3     Alternative A
        6.4     Alternative B
 7     Telex signalling
 8     Aggregate signals and interface
 9     System clock arrangements
10     System maintenance, control and alarms
11     Link performance and availability indicators
References