PRIVATE BRANCH EXCHANGE HAVING THE FUNCTION OF GAIN ADJUSTMENT AND GAIN ADJUSTMENT METHOD FOR PRIVATE BRANCH EXCHANGE

摘要

The present invention is to compensate for the attenuation phenomenon of gain values ​​that may occur with respect to that, the signal to be transmitted and received over the trunk line to improve the communication quality to be provided for the extension subscriber connected to an external communication network via a trunk line connected to the private branch exchange to propose a private branch exchange of the gain control device and method that can adjust the gain of the signal to be sent and received through a private branch exchange.