Continuous TDEV calculation for in-situ synchronisation monitoring in SONET/SDH networks

C-TDEV is proposed to adapt the block TDEV stability measure from atomic clock metrology to continuous in-situ network synchronisation monitoring. C-TDEV processes TIE samples serially and detects stability fluctuations in the real-time scale of the fluctuations themselves. It yields constant statistical confidence for all observation intervals and requires much less storage than the block calculation.