Network synchronization apparatus

Details Network synchronization apparatus Network synchronization apparatus

1978-01-23

1979-03-13

Robinson, Thomas A.

H04J 306

Patent

active

041444140

ABSTRACT:
The method of and apparatus for synchronizing all local oscillators in a multinode communication system is disclosed wherein each local oscillator is synchronized to the average frequency of some or all incoming signals from neighboring nodes. This is accomplished by detecting the difference in frequency between the local oscillator and the frequency of incoming signals, averaging these differences, and using the average to adjust the local oscillator. The frequency difference is measured over a period of time and the accumulated difference over the period is checked for reasonableness prior to use. Its use is further delayed after the period of measurement by a period of time while the incoming link is monitored for signal problems which might have occurred toward the end of the accumulation period and which therefore would not have been detected by an immediate reasonableness check.

REFERENCES:
patent: 4042781 (1977-08-01), Dragotinov
patent: 4059731 (1977-11-01), Green et al.

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