Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1998-07-31
1999-04-20
Chan, Jason
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375364, 370516, H04L 2536, H04L 2540, H04L 700
Patent
active
058964274
ABSTRACT:
A network node destination module for ensuring proper reception and transmission of information over a network having an optional network reference clock including an input stage for receiving the information, a synchronous residual time stamp (SRTS) timing control stage for implementing digital phase comparison techniques utilizing the network reference clock, and a clock generation stage for generating a transmit clock in response to a control value generated by the SRTS timing control stage. The SRTS timing control stage maintains a constant phase offset between the receive clock of the source node and the transmit clock of the destination node. The SRTS timing control stage includes an RTS sample generator for generating a local RTS sample for comparison with the source RTS sample to determine a current phase offset between the source and clocks. The current phase offset is then compared to a target phase offset stored in a phase register to generate a control value. The clock generation stage adjusts the transmit clock in response to a filtered control value and transmits the source data to the destination CPE at the adjusted transmit clock frequency. By maintaining a constant phase offset, the frequencies of the receive clock of the source node and the transmit clock of the destination node are synchronized, thereby providing CBR service. In addition to performing SRTS clock recovery techniques, the destination module may also be configured to perform adaptive clock recovery (ACR) and synchronous network clock (SNC) techniques.
REFERENCES:
patent: 4961188 (1990-10-01), Lau
patent: 5210773 (1993-05-01), Schmid et al.
patent: 5260978 (1993-11-01), Fleischer et al.
patent: 5394442 (1995-02-01), Lill
patent: 5396492 (1995-03-01), Lien
patent: 5526362 (1996-06-01), Thompson et al.
patent: 5555261 (1996-09-01), Nakayama et al.
patent: 5608731 (1997-03-01), Upp et al.
patent: 5619500 (1997-04-01), Hiekali
patent: 5621775 (1997-04-01), Etienne
patent: 5694397 (1997-12-01), Burton
Fedorkow Guy
Jacobs Steven E.
Muntz Gary S.
Chan Jason
Cisco Technology Inc.
Corrielus Jean B
LandOfFree
System and method for maintaining network synchronization utiliz does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for maintaining network synchronization utiliz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for maintaining network synchronization utiliz will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2253462