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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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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Now, as the rapid development of civil aviation, the deficiency of Aeronautical Telecommunication Network (ATN) based on the Open System Interconnection (OSI) model, becomes more and more obvious.

现在，随着民航业务的飞速发展，基于开放系统互联(osi)模型的航空电信网(atn)逐渐显示出了它的不足。

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