Diagnostic methods and systems for multicarrier modems

Details Diagnostic methods and systems for multicarrier modems Diagnostic methods and systems for multicarrier modems

H - Electricity

04

L

H04L 12/26 (2006.01) H04L 27/34 (2006.01) H04L 1/24 (2006.01)

Patent

CA 2726826

Upon detection of a trigger, such as the exceeding of an error threshold or the direction of a user, a diagnostic link system enters a diagnostic information transmission mode. This diagnostic information transmission mode allows for two modems to exchange diagnostic and/or test information that may not otherwise be exchangeable during normal communication. The diagnostic information transmission mode is initiated by transmitting an initiate diagnostic link mode message to a receiving modem accompanied by a cyclic redundancy check (CRC). The receiving modem determines, based on the CRC, if a robust communications channel is present. If a robust communications channel is present, the two modems can initiate exchange of the diagnostic and/or test information. Otherwise, the transmission power of the transmitting modem is increased and the initiate diagnostic link mode message re-transmitted to the receiving modem until the CRC is determined to be correct.

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