Patent ID: 9450686
Filing Date: 2016-09-20
CPC Classification: H04B,H04L

Claim Text:
1. A method of testing an upstream path of a cable network, the method comprising: receiving a request to demodulate and obtain signal quality information of an upstream data packet generated by a first terminal device connected to a cable network; receiving the upstream data packet generated by the first terminal device; demodulating the received upstream data packet, wherein demodulating the upstream data packet comprises demodulating upstream data packets determined to have a packet length of a first length, and not demodulating upstream packets determined to have a packet length other than the first length; receiving the at least one upstream pre-equalization coefficient used by the first terminal device to generate the upstream data packet; determining signal quality information pertaining to the upstream data packet; correcting, using the at least one upstream pre-equalization coefficient, the determined signal quality information to account for pre-equalization of the upstream data packet, wherein the signal quality information includes measured frequency response information pertaining to the received and demodulated upstream data packet; and communicating the corrected signal quality information to a test instrument.