A method and system use voiceband transmission characteristics to estimate the viability of deploying broadband services over a subscriber loop in the public switched telephone network. The system gives network service providers the ability to predict the performance of broadband transmission channels,...http://www.google.com.tw/patents/US6091713?utm_source=gb-gplus-share專利 US6091713 - Method and system for estimating the ability of a subscriber loop to support broadband services
