Patent ID: 6147963
Filing Date: 2000-11-14
Classification: H03M,H04B,H04L

Abstract:
A communications system comprising:a first high speed link having a first transformer interface at a transmit end and a second transformer interface at a receive end;a second high speed link having a third transformer interface at a transmit end and a fourth transformer interface at a receive end;a low speed link comprising a phantom circuit formed by the first to fourth transformers, the transmit end of the low speed link being formed by connections to the centre taps of the first and third transformers and the receive end of the low speed link being formed by connections to the centre taps of the second and fourth transformers;wherein the transmit end of the low speed link is connected to a power supply and wherein the transmit end of the low speed link comprises a switch for periodically interrupting the power supplied from said power supply, at least one of the high speed links being connected to a device at the receive end for receiving signals from the respective high speed link, the receive end of the low speed link being capable of providing power and signals to the device from the power supply.