A method and at least one subscriber station utilizes a software package in combination with at least one terminal adapter which links ISDN circuit-switched channels, such as "B", "H0", "H10", "H11" and the like, into a single logical connection and synchronizes the linked channels in an ISDN system....http://www.google.com.tw/patents/US5276679?utm_source=gb-gplus-share專利 US5276679 - Method for maintaining channels and a subscriber station for use in an ISDN system
