Control circuit for an adaptive hybrid control in a local area network

摘要

In a local area network having a plurality of stations coupled to a transmission line over which signals are being simultaneously transmitted and received and wherein each station includes a station controller, a transmitter, a receiver and an adaptive hybrid circuit coupled to the transmission line and between the transmitter and the receiver for adaptively cancelling crosstalk from the transmitter to the receiver, a control circuit in each station for controlling the operation of the adaptive hybrid circuit in the station. In a first embodiment of the invention the control circuit includes a first circuit responsive to a request-to-send signal from the station controller for generating a first signal to enable a signal to be transmitted by the transmitter, and a second circuit responsive to the first signal for enabling the adaptive hybrid circuit to adaptively cancel crosstalk from the transmitter to the receiver after a preselected period of time after the start of each transmission.