| 摘要 |
Router apparatus for initiating a control channel within a protocol stack comprises a receiving protocol stack, a controller and an operating system. The controller is programmed to respond to receipt of a message, for example a congestion message, from a fast packet network such as a frame relay or cell relay network to generate a pass through packet message requesting the opening of an upward control channel between layer N and layer N+2 of the protocol stack, where typically layer N is layer 2 of a frame relay protocol and layer N+2 is layer 4 of a TCP protocol. Layer 4 may refuse to open the channel but once a channel is opened, for example, in the presence of congestion, a data flow control may be initiated between destination intelligent terminals when congestion is sensed in the fast packet network. The data flow control channel may have the purpose of segmentation control, compression control or data presentation rate control. The upward N+2 pass through packet control channel may have other applications including switching control and encryption control.
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