Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2008-02-21
2010-12-07
Ngo, Ricky (Department: 2464)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C037S250000
Reexamination Certificate
active
07848248
ABSTRACT:
A method and apparatus enabling the measurement of one way delay in each of the two directions of transmission from a single location are disclosed. The method measures a first roundtrip delay at a first location between a first endpoint and a second endpoint over a first communication network, and measures a second roundtrip delay between a third endpoint and a fourth endpoint over a second communication network with symmetric delay characteristics. The method performs synchronous recordings of a test signal that is sent simultaneously from the second endpoint to the first endpoint and from the fourth endpoint to the third endpoint, to measure an arrival time (t1) of the test signal over the first communication network, and, an arrival time (t2) of the test signal over the second communication network t2, where the arrival times (t1) and (t2) are used to calculate an one way transmission delay in the first communication network.
REFERENCES:
patent: 2002/0131604 (2002-09-01), Amine
patent: 2006/0234739 (2006-10-01), Thadasina et al.
patent: 2007/0116064 (2007-05-01), Kim et al.
patent: 2008/0151771 (2008-06-01), Dowse
AT&T Intellectual Property I L.P.
Ngo Ricky
Oveissi David
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