Inquirer-side circuit capable of operating in asymmetry data mode

An inquirer-side circuit (110), comprising:

• a hybrid circuit (112) arranged to operably couple with an MDI circuit (111) to conduct data communication with a respondent-side circuit (120) through the MDI circuit (111);
• a transmitting circuit (113) coupled with the hybrid circuit (112) and arranged to operably generate and transmit a transmission signal (St1) to the hybrid circuit (112);
• a receiving circuit (114) coupled with the hybrid circuit (112) and arranged to operably receive and parse a received signal (Sr1) transmitted from the hybrid circuit (112) to generate a data signal (Sd1);
• a processing circuit (115) coupled with the receiving circuit (114) and arranged to operably process the data signal (Sd1);
• a physical coding sublayer circuit (116) coupled with the processing circuit (115) and arranged to operably conduct a physical coding operation based on instructions of the processing circuit (115), so as to control operations of the transmitting circuit (113);
• and
• an echo cancellation circuit (117) coupled between the transmitting circuit (113) and the receiving circuit (114) and arranged to operably generate an echo cancellation signal.