Internet and optical fiber transmission network are two large global networks. At present, they are heading in the direction of B-ISDN. Optical fiber transmission network is an information expressway that joins users to network and one network to another.

• 国际互联网和通信网是全球两大网络,目前这两大网络正朝着共同组成宽带综合业务数字网(B-ISDN)的方向发展,而光纤传输网是连接用户和网络、网络和网络之间的信息高速公路。