Waiting time jitter reduction by synchronizer stuffing threshold modulation
First Claim
1. A process for communicating comprising:
- writing a received signal into a buffer in accordance with a write signal derived from said received signal,reading out said received signal from said buffer in accordance with a locally generated read signal, andregulating said read signal depending on instances in which a phase difference between said write signal and said read signal exceed a dynamically randomly varying threshold.
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Abstract
A system and method are disclosed for reducing waiting time jitter in a pulse-stuffing multiplexer of a communications network. The data of a lower rate signal, that is plesiochronous with a higher rate signal into which the lower rate signal is to be multiplexed, is written into an elastic buffer in accordance with a write signal that is derived from the data of the lower rate signal. The data is read out of the elastic buffer in accordance with a read signal which is locally generated. A comparison circuit forms the phase difference between the write and read signals. A justification circuit generates a justification signal with pulses corresponding to the instances where the phase difference exceeds a dynamically randomly varying threshold. The pulses of the justification signal, in turn, regulate the reading out of the data of the lower rate signal from the elastic buffer.
55 Citations
20 Claims
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1. A process for communicating comprising:
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writing a received signal into a buffer in accordance with a write signal derived from said received signal, reading out said received signal from said buffer in accordance with a locally generated read signal, and regulating said read signal depending on instances in which a phase difference between said write signal and said read signal exceed a dynamically randomly varying threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for multiplexing plural plesiochronous signals into respective time slots of a higher rate signal comprising the steps of:
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for each lower rate signal; writing data of said lower rate signal into a buffer in accordance with a write signal derived from said data of said lower rate signal, reading out said data of said lower rate signal from said buffer in accordance with a locally generated read signal, and regulating said read signal depending on instances in which a phase difference between said write signal and said read signal exceed a dynamically randomly varying threshold, and multiplexing said data of each lower rate signal read out during said step of reading out into a respective time slot of said higher rate signal. - View Dependent Claims (15)
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16. A synchronizer for synchronizing a received plesiochronous signal comprising:
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a buffer, in which said received signal is written in accordance with a write signal that is derived from said received signal, and from which said received signal is read out in accordance with a locally generated read signal, and a justification decision circuit receiving a dynamically randomly varying threshold and a phase difference between said write signal and said read signal for regulating said reading out of said local signal from said buffer depending on instances in which said phase difference exceeds said dynamically randomly varying threshold. - View Dependent Claims (17, 18)
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19. A communication system comprising
a synchronizer for multiplexing plural received plesiochronous signals into respective time slots of a higher rate signal comprising: -
for each received signal; a buffer, in which said received signal is written in accordance with a write signal that is derived from said received signal, and from which said received signal is read out in accordance with a locally generated read signal, and a justification decision circuit receiving a dynamically randomly varying threshold and a phase difference between said write signal and said read signal for regulating said reading out of said received signal from said buffer depending on instances in which said phase difference exceeds said dynamically randomly varying threshold, and a multiplexer for multiplexing each received signal read out of said buffer into a respective time slot of said higher rate signal. - View Dependent Claims (20)
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Specification