Summary

             Defines the requirements for an equipment to perform in-service monitoring of digital signals at bit rates of 2, 8, 34 and 140 Mbit/s using the frame alignment signal.

             Keywords

             –     frame alignment signal monitoring;

             –     frame analyser;

             –     in-service monitoring;

             –     measurement;

             –     tester.

PREAMBLE

             Section 1 applies to all four bit rates (2048, 8448, 34 368 and 139 264 kbit/s).

             Section 2 provides additional information applicable to 2048 kbit/s signals only.