光纤干线 meaning in Chinese

fbb fiber backbone

But between the lan and backbone is provided by much lower bandwidth technologies available through the existing copper wire , adsl , cable modem , and the " last mile " ( between the lan and fiber backbone ) problem has become a bottle - neck in the wideband transmission
但是光纤干线和局域网间接入系统却是传统的铜缆、 adsl 、同轴电缆等，传输速率都在10mbps以下。所以光纤和局域网间“最后一公里”的接入成为解决宽带传输的瓶颈问题。
With the development of the fiber communication , very high speed fiber optic backbone has being closed to the customer , but few customers has connected to fiber backbone directly . on the other hand , many customers are running some high speed network within their lan , such as fast ethernet ( 100mbps ) , or gigabit ethernet ( 1 . 0gbps )
随着光纤通信技术的发展， 2 . 5g - 10gbps的光纤干线正在不断的向用户延伸，但由于成本和光纤敷设工程上的难道，只有很少的用户直接和光纤干线相连，通常光纤只延伸到了路边、小区；另一方面，许多用户内部的局域网也具有很高的传输速率，一般为100mbps甚至1gbps的以太网。