本文讨论ＬＡＮ（局域网）与ＭＡＮ（都市网）通过Ｂ－ＩＳＤＮ（宽带综合业务数字网）来进行互连的问题。这种互连显示出Ｂ－ＩＳＤＮ具有真实前途的一种应用，因为它可避免常规ＬＡＮ互连中大多数传统缺点。然而，必须选择正确的协议才能有效地利用Ｂ－ＩＳＢＮ。为了能及早经济地实现ＬＡＮ／ＭＡＮ互连，早期就应仔细考虑互连的要求。简言之，人们期望Ｂ－ＩＳＤＮ新的可能性将开辟有吸引力的新的ＬＡＮ互连的可能性，同时提供现时尚无法达到的性能。这一定可以促进该地区通信迅速发展 This article discusses the issue of LAN (Local Area Network) and MAN (Metropolitan Area Network) interconnection via B-ISDN (Broadband Integrated Services Digital Network). This interconnection shows an application where B-ISDN has a real future because it avoids most of the traditional shortcomings of conventional LAN interconnects. However, the right agreement must be chosen to make effective use of B-ISBN. In order to achieve LAN / MAN interconnection early and cost-effectively, interconnect requirements should be carefully considered early on. In short, it is expected that the new possibilities for B-ISDN will open up the possibility of attractive new LAN interconnects while delivering capabilities not currently possible. This will certainly promote the rapid development of communications in the region