Summary

Recommendation ITU-T G.811 outlines minimum requirements for timing devices used as primary reference clocks in synchronization networks. These networks include public switched telephone networks (PSTNs) and synchronous digital hierarchy (SDH) networks.

Amendment 1 to Recommendation ITU-T G.811 (1997) adds:

����������� A 10 MHz interface and a note in clause 9.

����������� 10 MHz jitter specification in clause 6.3.