Method of monitoring the quality of a communications channel

Details Method of monitoring the quality of a communications channel Method of monitoring the quality of a communications channel

2004-01-30

2008-03-04

Lugo, David B. (Department: 2611)

Pulse or digital communications

Testing

Signal noise

C375S226000

Reexamination Certificate

active

07339986

ABSTRACT:
A method is presented that monitors the quality of a communications channel. The method includes receiving a data signal and establishing a zero reference phase of the received data signal. The method further includes generating a phase-shifted data signal by phase shifting the received data signal relative to the zero reference phase, and sampling the phase-shifted data signal for one or more phase-shift positions. A zero reference phase is reestablished between sampling at each of the phase-shift positions. The method also includes detecting bit errors in the phase-shifted data signal at each of the phase-shift positions in order to provide a communications channel quality measurement. In an embodiment, the method includes generating an eye diagram according to a count of detected bit errors relative to a count of detected bits. The eye diagram characterizes the quality of the communications channel.

REFERENCES:
patent: 6094740 (2000-07-01), Boccuzzi et al.
patent: 6990418 (2006-01-01), Blanc et al.
patent: 2005/0171994 (2005-08-01), Proano et al.
Agrawal, G.P., “Fiber-Optic Communication Systems,” John Wiley & Sons, Inc., New York, NY, pp. 153, 154, and 176-180 (1992).

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