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If ZB and Z2 matches BRL

. It indicates the attenuation on echo is infinite and no necessity of any attenuators.

The total attenuation on echo is given by net attenuation offered by the four-line circuit minus the gain of the amplifiers. Hence by clockwise movement from talker to talker circuit,

The echo delayed is where D4 is the delay of four-wire circuit.

at = [3 - G4 + (BRL + 6) - G4 + 3] dB at = 2a2 + BRL

If P4 is incoming power on the 4 wire circuits, P2 power raching the 2 wire curcuit and P,

2 is the power reflected onto the return path, the BRL interms of power is

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