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

1992-10-30

1993-11-09

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

375111, 375113, H04L 700

Patent

active

052609782

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.sup.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: 4961188 (1990-10-01), Lau
"Jitter Reduction in ATM Networks," Julio Gonzales and Jean-Paul Le Meur Proceedings ICC '91, 9.4.1-9.4.6.
"Jitter and Clock Recovery for Periodic Traffic in Broadband Packet Networks," R. P. Singh, S. H. Lee and C. K. Kim, Presented at IEEE Globecom '88, Florida, Dec. 1988.
"Adaptive Clock Synchronization for Real-Time Traffic in Broadband Packet Networks" R. P. Singh and S. H. Lee, Presented-8th Eur. Conf. on Electrotechnics, Stockholm, Sweden, Jun. 1988.

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