在开放系统互连osi模型中，路由是网络层(第三层)的功能。
Routing is a function associated with the network layer (layer 3) in the standard model of network programming, the Open Systems Interconnection (OSI) model.
本文从网络互连的角度出发，讨论用于OSI网关的无连接网络层协议CLNP的功能选取与实现。
In this paper, we describe a selection and implementation of the functions of CLNP for OSI interconnection to implement a gateway.
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。
Like ISDN and DSL, HSSI operates at the physical layer of a network, using the standard Open Systems Interconnection (OSI) model.
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