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1 引言六十年代末、七十年代初发展起来的局部地区网络(LAN),仅提供单一的数据业务,远远不能满足整个社会发展的需要。如果能在LAN中包括十分重要的电话业务以及可视电话、会议电视、传真等业务,建立综合业务局部网(ISLN),那当然是人们梦寐以求的。积极研制适合中国情况的ISLN,可以为人们提供满意的信息服务,为我国的经济建
1 Introduction Local Area Networks (LANs), developed in the late 1960s and early 1970s, provide only a single data service that is far from meeting the needs of the entire community. It would certainly be a dream to have ISLN included in the LAN for all the essential telephone services, videophones, videoconferencing, faxing and other services. Actively develop ISLN suitable for China, can provide people with satisfactory information services for our economic construction