Methods and systems for use of common mode rejection (CMR) for echo cancellation in uplink communications

A system for use in a node of a cable network, the system comprising:

• one or more transmission circuits configured for transmitting downstream (DS) signals in the cable network;
• one or more reception circuits configured for receiving upstream (US) signals in the cable network;
• one or more echo cancelling circuits configured for cancelling echo introduced by transmitting of downstream signals onto upstream reception path, wherein the one or more echo cancelling circuits comprise a feed-forward (FF) digital-to-analog convertor (DAC) circuit,
• the FF DAC to output an analog signal to combine with a signal corresponding to an output of one or more echo cancelling combiner circuits;
• and
• a variable resistor circuit coupled to the FF DAC, the variable resistor circuit configured to selectively adjust the analog signal before the analog signal is combined with the signal corresponding to the output of the one or more echo cancelling combiner circuits, wherein:
• the one or more transmission circuits and the one or more reception circuits are configured for supporting full-duplex (FDX) communications via the cable network;
• the one or more echo cancelling circuits are configured at least for mitigating direct leakage associated with the DS signals, that is introduced onto the US signals;
• and
• the one or more echo cancelling circuits are configured for operating in the analog domain.