The invention provides a variable length frame exchanging method adapted to a fixed length cell handling exchange into which a terminal for use with a data communication method by a variable length frame is accommodated, a variable length frame exchanging interface apparatus and a call acceptance determination...http://www.google.com.tw/patents/US5610918?utm_source=gb-gplus-share專利 US5610918 - Method and apparatus for exchanging variable length frames by fixed length cell handling exchange
