shows an example of a timing diagram for the connection setup though two intermediate bust switches from source node A to destination node B This figure shows that following the transmission of the control packet, the burst itself is sent after a specified delay called an offset time it. The time it takes to set up a connection depends on the end-to-end propagation time of the control packet , the sum of all the processing delays tproc of the control packet at intermediate nodes, and the time tconf it takes to configure the link. Once the link is configured, the travel time for the burst to each the destination node is equal to the propagation time, since no further processing is required for the burst at any intermediate node. Therefore, the start of the burst has to be delayed by an offset time following transmission of the control packet in order to give the link enough time to be configured .If there are N intermediate nodes in the link, then the offset time must be at lest Ntproc + tconf Note that the edge router sends the burst immediately after expiration of the offset time without waiting for an acknowledgement from the destination to indicate that the link is complete. Furthermore, the burst transmission may start before the control packet its destination.