Synchronous residual time stamp for timing recovery in a broadband network
Patent 5260978 Issued on November 9, 1993. Estimated Expiration Date: 
October 30, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSynchronous frequency encoding technique for clock timing recovery in a broadband network Patent #: 4961188 InventorsAssigneeApplicationNo. 969592 filed on 10/30/1992US Classes:375/354, SYNCHRONIZERS375/362, Frequency or phase control using synchronizing signal375/364Synchronization signals with unique amplitude, polarity, length, or frequencyExaminersPrimary: Kuntz, CurtisAssistant: Phan, Hien H. Attorney, Agent or FirmInternational ClassH04L 007/00AbstractA 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 2P 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.Other References
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