Routing is a function associated with the network layer (layer 3) in the standard model of network programming, the Open Systems Interconnection (OSI) model.
在开放系统互连osi模型中，路由是网络层(第三层)的功能。
An electric network for of clear layer, simple structure, standard connection, rational redundancy and appropriate advance technology is set up, "N-1" standard of city network is realized.
建立层次清晰、结构简单、接线规范、冗余度合理、技术适度超前的电网框架，实现城市电网“N - 1”准则。
Like ISDN and DSL, HSSI operates at the physical layer of a network, using the standard Open Systems Interconnection (OSI) model.
像ISDN和dsl, HSSI运营网络的物理层，使用标准的开放系统互连(osi)模型。
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