Study of Alternative Techniques for Communication Network Timing/Synchronization.

摘要

In digital point-to-point communications, it is only necessary that the receiver be correctly synchronized to the received bit stream and it is not necessary to synchronize the transmitters. However, in a large digital communications network where the signals remain in digital form through time division multiplexers and/or switches, each bit must be available at the correct time to fill its assigned time slot. This is a report on the study of this problem. It evaluates the requirements for a timing subsystem for the future DCS, gives rationale for those characteristics of a DCS timing subsystem which will best meet the needs of the DoD and the U.S. Government. The conclusions of the study state, 'The results of both the analysis and simulation efforts have led to the recommendation of time reference distribution as the technique to employ at the major nodes of the switched digital Defense Communications System.' The study also recommends that the master-slave technique be used at lower level nodes. (Author)