Providing timing to an external system

Details Providing timing to an external system Providing timing to an external system

1997-08-29

1999-12-21

Chin, Stephen

Pulse or digital communications

Synchronizers

Network synchronizing more than two stations

375354, 375357, 375358, 370503, 370507, 359118, 359115, 359135, 359158, 395551, H04L 700, H04J 306, H04B 1000

Patent

active

060059028

ABSTRACT:
Synchronizing a local timing unit to a central timing unit in a first switching system to determine the difference in timing between a connected external link and the local timing unit. This timing difference is then transmitted to the central timing unit which utilizes this information to adjust a frequency synthesizer that outputs the frequency of the external link to a second switching system. The local timing units are synchronized to the central timing unit via multiple timing paths set up through switching units within a switching network of the first switching system. The timing difference transmitted from the local timing unit is transmitted over a plurality of control paths through the switching units. Each switching unit switches one bit of data for each group of data being received on each of the external links connected to the first switching system. Any of the external links connected to the first switching system can be utilized to provide timing information for the second switching system.

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