Selectable loss of signal (LOS) criteria

Details Selectable loss of signal (LOS) criteria Selectable loss of signal (LOS) criteria

2006-09-07

2009-12-15

Nguyen, Brian D (Department: 2472)

Multiplex communications

Diagnostic testing

Fault detection

C370S252000

Reexamination Certificate

active

07633878

ABSTRACT:
A system and method are provided for selecting loss of signal (LOS) criteria in a serial communications receiver. The method receives a serial stream of digital data and selects LOS criteria. The serial stream of digital data is compared to the selected LOS criteria. In response to the serial stream of digital data failing to meet the selected LOS criteria, a LOS signal is generated. Some examples of the LOS criteria that might be selected include: a “signal detect” signal received from the source transmitting the serial stream of digital data, a run length test, a signal strength (voltage amplitude) test, harmonic band detection test, and a received data clock test. In one aspect, selecting LOS criteria includes selecting combinations of the above-mentioned LOS criteria, so that the LOS signal is generated in response to failing to meet the combination of selected LOS criteria.

REFERENCES:
patent: 6999480 (2006-02-01), Subrahamanyan
patent: 2003/0031212 (2003-02-01), Becker et al.
patent: 2004/0208568 (2004-10-01), Sweeney et al.
patent: 2005/0243958 (2005-11-01), Fernald

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