Connection control circuit

摘要

A connection control circuit (port) is provided to guarantee a high quality of port-to- port connection service by enabling to maintain the suspended state even when a disparity exists in the pulse widths of the envelope signals of the tone signals between the sender and receiver, exemplified by a receiver tone pulse width being wider than a sender tone pulse width. Connection control is achieved by providing a signal correction circuit (6) between the receiver circuit (3) of a port that receives incoming signals from an opposing port through a transmission line and a connection state managing machine (5) that manages connection between the ports. The signal correction circuit corrects the tone pulse width of an envelope-signal generated from the incoming tone signal by broadening the pulse width so as to conform to a tone signal having the pulse width specified by own connection state managing machine. <IMAGE>