Method and apparatus for performing automatic synchronization fa

Details Method and apparatus for performing automatic synchronization fa Method and apparatus for performing automatic synchronization fa

1997-06-11

2000-03-28

Kizou, Hassan

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370395, 375371, H04J 306, H04L 700, H04L 1256

Patent

active

060440929

ABSTRACT:
By recognizing that it is not necessary to identify a synchronization failure immediately when the failure occurs, but rather not until the failure results in a detectable difference, the method and system described herein can distinguish between Cell Delay Variation (CDV) and loss of synchronization. Because CDV will have a larger effect on the stability than a failure of the frequency recovery system at the precise moment of the failure, a synchronization failure cannot usually be distinguished from CDV for several minutes or hours, depending upon the stability of the reference clock. The present invention monitors a fill level of a play-out buffer in the ATM network, and attempts to determine if a variation in the fill level is linear with time, which is indicative of a synchronization failure. Upon detecting such a failure, the method of the present invention switches to an adaptive method for frequency recovery. If the variation in the fill level of the play-out buffer is not linear, but an underflow/overflow (or slip) has occurred, then the method of the present invention can inform an intelligent buffer control that the underflow/overflow is not due to the presence of a synchronization failure, which enables the intelligent buffer controller to take appropriate action.

REFERENCES:
patent: 5260978 (1993-11-01), Fleischer et al.
patent: 5396492 (1995-03-01), Lien
patent: 5694397 (1997-12-01), Burton
patent: 5742649 (1998-04-01), Muntz et al.

Affiliated with

Also associated with

Rating

Method and apparatus for performing automatic synchronization fa does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for performing automatic synchronization fa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for performing automatic synchronization fa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1332335