Figure 1 shows the Open Systems Interconnection (OSI) model, which is used to explain the interactions between network protocols.

图1展示了Open Systems Interconnection (osi)模型，该模型用于解释网络协议之间的交互。

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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。

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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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