Recovery and transmission of return-to-zero formatted data using non-return-to-zero devices
August 2, 2021. 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 ReferencesCircuitry for transmitting clock information with pulse signals and for recovering such clock information Method and apparatus for encoding an NRZI digital signal with low DC component Hybrid DPCM codec for composite color television signals Method and apparatus for clock and data recovery with high jitter tolerance Low power optical transceiver for portable computing devices Modulator circuit for a recording for a digital recording medium Error detecting method and apparatus for data communications Clock doubler and smooth transfer circuit Method and apparatus for providing data stream for cost effective transmission links High speed serial link for fully duplexed data communication InventorsAssigneeApplicationNo. 09/922500 filed on 08/02/2001US Classes:341/69, Return-to-zero to or from NRZ (nonreturn-to-zero) codes341/56To or from multi-level codesExaminersPrimary: Jeanglaude, Jean BrunerAttorney, Agent or FirmInternational ClassesH04L 25/49 (20060101)H04L 7/02 (20060101) AbstractReturn-to-zero (RZ) formatted data is recovered and transmitted using non-return-to-zero (NRZ) devices. A NRZ clock and data recovery device (CDR) interprets the clock rate of a RZ formatted signal as twice its actual clock rate. Due to this interpretation, extra zeroes will be inserted in the data stream. The extra zeroes introduced by the NRZ interpretation of the data are discarded, and the interpreted clock rate is divided resulting in preserving the values of the original data stream of the RZ formatted signal.A NRZ encoded data stream at a specific clock rate is processed so that when the data stream is transmitted to a recipient expecting RZ formatted data, the recipient interprets the correct data. | |
