A line interface couples a data transceiver to a transmission line via a transformer,
the data transceiver transmitting signals in a first frequency range and receiving
signals in a second frequency range. The line interface includes an input port
for receiving an input signal voltage from an analog front end (AFE) chip, an output
port, a line driver for amplifying the input signal voltage and supplying a transmit
signal to the output port, a line port for sending the transmit signal and receiving
a receive signal, termination resistors coupled between the output port and the
line port, a receive signal port for supplying the receive signal to the AFE chip,
a receive amplifier formed on the AFE chip coupled to the receive signal port,
and a bridge network resistively coupling the line port and the output port to
the receive signal port, the bridge network having a low-pass filter characteristic.