| 摘要 |
A method of routing packets between nodes of a packet switched network comprises receiving a packet at a first node, the packet comprising routing information and payload data, sending the routing information to a second node in the routing path via a first transmission medium having a relatively high transmission speed, and sending said payload data to said second node via a second transmission medium having a relatively low transmission speed. Upon receipt of said routing information, said second node is able to prepare or begin preparation for onward routing of the packet in advance of receipt of said payload. The first medium may comprise a radio interface or copper wire and the second medium may comprise a fibre optic cable. Alternatively, the first and second transmission media may be provided as different channels across the same physical transmission path and may take advantage of the fact that lower and higher frequencies travel at different speeds in a fibre optic cable. The method may be used to quickly set up priority paths for emergency calls via Resource Reservation Protocol (RSVP) or for national security related data transmissions and may also be used to provide different QoS classes in the Next Steps in Signalling (NSIS) protocol. |
