Method, system and apparatus for reducing synchronization and resynchronization times for systems with pulse stuffing
AssigneeAdtran, Inc.
InventorsKevin W. Schneider, Jamie Kelly, Dennis B. McMahan, Marc Kimpe
Life of this patent
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Abstract
A method, system and apparatus for decreasing the time frame synchronization and resynchronization in a data communication uses an long frame sync word formed by combining a frame sync word with stuff bits, wherein the stuff bits are necessary for timing adjustments.
Claims28
A method for acquiring frame synchronization or resynchronization in a system communicating data frames between a transmitter and a receiver, the method comprising the steps of:
- generating a first frame sync word located at the beginning of a first data frame;
- appending payload and overhead bits to the end of the first frame sync word;
- appending stuff bits to the end of the payload and overhead bits, wherein the stuff bits function to correct timing offsets;
- generating a second frame sync word located at the beginning of the a second data frame;
- detecting a long frame sync word formed by the combination of the stuff bits and the second frame sync word;
- and
- acquiring frame synchronization based at least in part upon the detected long frame sync word.
A method for reducing the mean time to synchronization or resynchronization of data frames in a data communication system, the method comprising the steps of:
- generating a first frame sync word located at the beginning of a first data frame;
- appending payload and overhead bits to the end of the first frame sync word;
- appending stuff bits to the end of the payload and overhead bits, wherein the stuff bits function to correct timing offsets and further the stuff bits having a complementary sync characteristic when combined with a second frame sync word;
- generating the second frame sync word located at the beginning of the second data frame, the second frame sync word and stuff bits forming a long frame sync word having an enhanced frame synchronization property;
- detecting the long frame sync word;
- and
- acquiring frame synchronization based at least in part upon the detected long frame sync word.
A system for acquiring frame synchronization of data frames transmitted over a communications channel, the system comprising:
- a framer for providing a first frame sync word at the beginning of a first data frame, for attaching a sequence of stuff bits at the end of the first data frame to correct timing offset, and for providing a second frame sync word at the beginning of a second data frame;
- and
- a deframer for detecting the occurrence of a stuff bits followed by the second frame sync word, whereby the combination of the stuff bits and the second frame sync word forms a long frame sync word having an enhanced frame synchronization property.
A transmitter apparatus for generating a sequence of data frames wherein the sequence contains frame sync words and long frame sync words, the apparatus comprising:
- means for detecting timing offsets between a transmitter clock and a receiver clock, the detecting means providing a pulse stuff signal;
- and
- a framer for inserting a frame sync word at the beginning of each frame and for inserting sync compatible stuff bits at the end of selected frames in response to the pulse stuff signal.
A receiver apparatus for providing frame synchronization, comprising:
- means for detecting a long frame synchronization word;
- means for detecting a frame synchronization word;
- and
- circuit means for acquiring frame synchronization in response to the output of the detectors, wherein the frame synchronization circuit is an arrangement of digital circuit elements programmed according to a frame synchronization algorithm.
Dependencies are inferred from the claim text.