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21世纪是一个多媒体的时代,未来的电信网也将是一个宽带,大容量的多媒体网络。为了满足人类社会对大容量信息传输的需求,未来的网络应具备这样的能力:提供Gb/s容量到商业区,提供Mb/s容量到个人和家庭,这将要求传输网中的骨干
The 21st century is a multimedia era, the future telecommunications network will also be a broadband, high-capacity multimedia network. In order to meet the needs of human society for large-capacity information transmission, the network of the future should have the ability to provide Gb / s capacity to commercial areas and provide Mb / s capacity to individuals and families, which will require the backbone in transmission networks