For two connected exchanges in a communications network, a double-ended synchronization (also called double-ended control) is a synchronization control scheme in which the phase error signals used to control the clock at one telephone exchange are derived by comparison with the phase of the incoming digital signal and the phase of the internal clocks at both exchanges.
References This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 22 January 2022.