Method and apparatus for synchronization of time stamping

Details Method and apparatus for synchronization of time stamping Method and apparatus for synchronization of time stamping

1997-09-15

2000-08-15

Kizou, Hassan

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370252, 370350, 370389, H04J 306

Patent

active

061047295

ABSTRACT:
The present invention relates to an apparatus and a method for synchronization, of at least two time stamping clocks (213; 214; 310, 311) in a network, with high accuracy as well as a method for measuring transmitting delays of packets, with high accuracy. In more detail the present invention comprises a GPS- receiver (207; 307) which supplies TOD (Time of Day) and PPS (Pulse per second) to a synchronization function (209, 210; 308, 309). The synchronization function uses TOD to be able to calculate an absolute time for said time stamping clock. This arrangement allows for a synchronized absolute time between the time stamping clocks in the different nodes (101, 102; 201, 202; 301, 302) with a resolution of 1 second. The PPS pulse is used to synchronize the clocks with an accuracy of 1 microsecond. The time stamping clocks in the different nodes in the network is phase-locked to network-synchronization clocks (205; 305). By adjusting the frequency of the time stamping clocks a suitable resolution can be obtained within each second.

REFERENCES:
patent: 5245634 (1993-09-01), Averbuch
patent: 5280629 (1994-01-01), Lo Galbo et al.
patent: 5440313 (1995-08-01), Osterdock et al.
patent: 5510797 (1996-04-01), Abraham et al.

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