1. ITU-T recommendation G.810, Definitions and terminology for synchronization network, ITU, Geneva, 1997
2. Communications Network Test and Measurement Handbook;Coombs,1998
3. Jitter and wander, critical factors in modern communications systems, Wandel & Goltermann, 1997, s.n.E 6.97/WG1/188/5
4. ITU-T recommendation O.171, Timing Jitter and wander measurement equipment for digital systems which are based on the plesiochronous digital hierarchy (PDH), ITU, Geneva, 1997
5. ITU-T recommendation O.172, Jitter and wander measurement equipment for digital systems which are based on the synchronous digital hierarchy (SDH), ITU, Geneva, 1999