04757452 is referenced by 20 patents and cites 13 patents.

A method and apparatus is provided for measuring the timing jitter of a tributary data stream that has been multiplexed into a higher-rate multiplex stream using pulse stuffing techniques. The required jitter measurement is carried out by monitoring the relevant stuffing control bits of the multiplex stream. In one embodiment, the apparatus comprises a first microprocessor for determining the tributary stuffing ratio from the stuffing control bits, and a second microprocessor operative to determine a current jitter signal value by using both the stuff information contained in the stuffing control bits, and the stuffing ratio determined by the first microprocessor. The second microprocessor carried out its task by updating a preceding jitter signal value by incrementing this value each time a stuff occurs while decreasing the jitter signal value at a rate dependent on the stuffing ratio. Preferred algorithms are disclosed for determining both the stuffing ratio and current jitter signal value.

Title
Jitter measurement method and apparatus
Application Number
6/859117
Publication Number
4757452
Application Date
May 2, 1986
Publication Date
July 12, 1988
Inventor
William McFarlane
Glasgow
GB
Peter M Scott
Edinburgh
GB
Agent
James M Williams
Assignee
Hewlett Packard Company
CA, US
IPC
H04J 3/07
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