Bilateral synchronization

In telecommunication, a bilateral synchronization is a synchronization control system between exchanges A and B in which the clock at telephone exchange A controls the data received at exchange B and the clock at exchange B controls the data received at exchange A.

Note: Bilateral synchronization is usually implemented by deriving the timing from the incoming bit stream. Synonym bilateral control.

Source: from Federal Standard 1037C and from MIL-STD-188