Error detection/correction and fault detection/recovery – Pulse or data error handling – Transmission facility testing
Reexamination Certificate
2006-07-14
2010-06-15
Ton, David (Department: 2117)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Transmission facility testing
C356S073100
Reexamination Certificate
active
07739561
ABSTRACT:
A method is disclosed for monitoring a communication link between a first apparatus and a second apparatus, the method comprising receiving concurrently from the first apparatus (e.g., a central office) at the second apparatus (e.g., an optical demarcation point at a customer premises) a communication signal at a communication wavelength, λ1and a test signal at a test wavelength λt, permanently separating the test signal from the communication signal at the second apparatus and sending to the first apparatus on a return path between the first apparatus and the second apparatus a signal indicating whether the test signal was received at the second apparatus. An apparatus is disclosed including an interface for receiving concurrently the communication signal and the test signal, a filter for permanently separating the test signal from the communication signal and a coupler for permanently placing a signal on a return path.
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Matteson Patricia R.
Pascasio, Jr. Jorey M.
Pascasio, legal representative Renne G.
AT&T Intellectual Property 1, L.P.
Roebuck G. Michael
Ton David
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