Synchronous residual time stamp for timing recovery in a broadba

Details Synchronous residual time stamp for timing recovery in a broadba Synchronous residual time stamp for timing recovery in a broadba

1995-11-08

2000-03-28

Vo, Don N.

Pulse or digital communications

Synchronizers

375362, 375364, 370509, 370394, 370516, H04L 700

Patent

active

RE0366331

ABSTRACT:
A Residual Time Stamp (RTS) technique provides a method and apparatus for recovering the timing signal of a constant bit rate input service signal at the destination node of a synchronous ATM telecommunication network. At the source node, a free-running P-bit counter counts cycles in a common network clock. At the end of every RTS period formed by N service clock cycles, the current count of the P-bit counter, defined as the RTS, is transmitted in the ATM adaptation layer. Since the absolute number of network clock cycles likely to fall within an RTS period will fall within a range determined by N, the frequencies of the network and service clocks, and the tolerance of the service clock, P is chosen so that the 2.sub.P possible counts, rather than representing the absolute number of network clock cycles an RTS period, provide sufficient information for unambiguously representing the number of network clock cycles within that predetermined range. At the destination node, a pulse signal is derived in which the periods are determined by the number of network clock cycles represented by the received RTSs. This pulse signal is then multiplied in frequency by N to recover the source node service clock.

REFERENCES:
patent: 4489421 (1984-12-01), Burger
patent: 4530091 (1985-07-01), Crockett
patent: 4759014 (1988-07-01), Decker et al.
patent: 4961188 (1990-10-01), Lau
patent: 5115431 (1992-05-01), Williams et al.
patent: 5255291 (1993-10-01), Holden et al.
CCITT Study Group XVIII/8--Contribution D. 1123 entitled "Proposed method to provide the clock recovery function for circuit emulation", (Dec. 1990).
Letter from P. Adam of CNET dated Aug. 26, 1991 concerning discussion on TS/SFET.
Memorandum from R. Lau and B. Kittams of Bellcore dated Oct. 11, 1991 re A Compromise of SFET and TS.
Memorandum from T. Houdoin to B. Kittams & R. Lau dated Oct. 14, 1991 re Compromise SFET/TS.
CNET Memorandum from T. Houdoin to R. Lau and B. Kittams re Compromise SFET/TS (undated).
Y. Matsuura, S. Kozuka, K. Yuki, "Jitter Characteristics of Pulse Stuffing Synchronization," pp. 259-264, Jun. 1968.
D.L. Duttweiler, "Waiting Time Jitter," Bell System Technical Journal, vol. 51, No. 1, pp. 165-209, Jan. 1972.
CCITT Recommendations G. 707, G. 708, G. 709 (1988).
CCITT Recommendations G. 823, G. 824 (1988).
CCITT Recommendations D.294, "Timing for CBO Services," Jun. 1989.
R.C. Lau, "Synchronous Frequency Encoding Technique for B-ISDN Circuit Emulation," SPIE vol. 1179 Fiber Networking and Telecommunications, pp. 160-171, Sep. 1989.
H.M. Ahmed, "Adaptive Terminal Synchronization in Packet Data Networks," Globecom, pp. 20.6.1-20.6.5, 1989.
CCITT SG XVIII Contribution, D.1020, "Timing Recovery for CBR Circuit Emulation." Dec. 1990.
CCITT Study Group XVIII--Contribution D. 1451 entitled "Performance Comparison of Timing Recovery Methods for CBR Services," Jun. 1991.
Submission to T1S1 entitled "Broadband Aspects of ISDN," T1S1.5/91-382, Nov. 4, 1991.
Summary Minutes of T1 Services, Architecture, and Signaling Technical Subcommittee (T1S1) Session, Nov. 8, 1991.
CCITT Study Group XVIII entitled "Synchronous Residue-Time Stamp: A Combination of SFET/TS", Dec. 1991.
CCITT Study Group XVIII entitled "Report of the meeting of SWP XVIII/8-3 (Services, IVS and AAL types 1 and 2)", Dec. 1991.
CCITT Study Group XVIII entitled "Revised text of I.363 Section 2 (AAL type 1)", Dec. 1991.
CCITT Recommendation I.363 entitled "B-ISDN ATM Adaptation Layer (AAL) Specification," (1991).
Appendix 5 (to Annex 7) for COM XVIII-R 70-E entitled "Descriptions of the SFET Method" (Jul. 1991).
Appendix 6 (to Annex 7) for COM XVIII-R 70-E entitled "Descriptions of the TS Method" (Jul. 1991).
R.C. Lau and P.E. Fleischer, "Synchronous Techniques for Timing Recovery in BISDN," IEEE Globecom, pp. 814-820, Dec. 1992.
R.C. Lau and P.E. Fleischer, "Synchronous Techniques for Timing Recovery in BISDN," Communications Switching of the IEEE Communications Society, IEEE Transactions on Communications, Apr. 1995.
Kozuka, "Phase Controlled Oscillator for Pulse Stuffing Synchronization System," Review of the Electrical Communications Laboratory, vol. 17, Nos. 5-6, May-Jun. 1969.
R.P. Singh et al., "Jitter and Clock Recovery for Periodic Traffic in Broadband Packet Networks," Bell Communications Research, Inc., presented at IEEE Globecom, Florida, Dec. 1988.
J. Gonzales et al., Proceedings ICC '91, "Jitter Reduction in ATM Networks," 1991, pp. 274-279.
R.P. Singh et al., "Adaptive Clock Synchronization Schemes for Real-Time Traffic in Broadband Packet Networks," Presented-8th European Conference on Electrotechnics, Stockholm, Sweden, Jun. 1988.
American National Standard, ANSI T1.105-1988, "Digital Hierarchy Optical Interface Rates and Formats Specification," Sep. 1988.
"Jitter Reduction in ATM Networks," Julio Gonzales and Jean-Paul Le Meur Proceedings ICC '91, 9.4.1-9.4.6.

Affiliated with

Also associated with

Rating

Synchronous residual time stamp for timing recovery in a broadba does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Synchronous residual time stamp for timing recovery in a broadba, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronous residual time stamp for timing recovery in a broadba will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1314878