what is Virtual channel

最新推荐文章于 2025-07-15 12:12:52 发布

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本文介绍了通过增加缓冲区数量实现单个连接的时间域复用，形成多个虚拟通道的方法，以此减少阻塞的可能性。并详细解释了异步传输模式(ATM)路由器的工作原理及其架构特点。

Virtual channel

A single connection can be time domain multiplexed by increasing the number of buffers. This provides some number of virtual channels for each connection and reduces the likelihood of blocking.

**Figure 23:** An example of 3 virtual channels per connection.

The virtual channel example depicted in Figure 23 is illustrating a relatively complicated architecture. The architecture of an Asynchronous Transfer Mode (ATM) router is built using similar techniques. However ATM routers use cells instead of flits or packets. Each cell is large enough to contain a virtual path and virtual connection identifier. These identifiers allow the cells to be transmitted over a single connection in any order (asynchronously). The router ``switches the labels" as the cells arrive, hence the name label switching routers.

Wavelength routing networks work on the same principle. In this case a single optical fiber contains a number of wavelengths (which are the ``virtual channels"). Incoming packets are switched to an appropriate out going wavelength.

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