By Hoang D.B. and Pye K.J.
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7. 2. 25 End-to-end Virtual Circuit Service Characteristics Establishment and clearing of a virtual circuit A switched virtual circuit is established when the call request issued by the calling DTE is accepted by the called DTE. The call request identifies the called and calling addresses and facilities requested for the call, and may include user data. If the call is refused by the called DTE, this DTE can signal the reason for call clearing to the calling DTE in a diagnostic code. 25. Once the call has entered the data transfer phase, either DTE can clear the call using the diagnostic code to signal to the remote DTE the reason for clearing.
Control field of I, S and U frames Asynchronous balanced mode (or simply Balanced mode) In this mode the stations have identical protocols. They both can initiate transmission at any time. They can send both commands and responses. 15. 7. Commands and responses In this section we will describe the various information, supervisory and unnumbered frames. These types of frame are distinguished by their 8-bit control fields. Within each type, the frames are differentiated by the ways the bits in the C-field are configured.
Packet forwarding is done at each node by inspecting the packet header of each incoming packet, consulting the routing table and placing the packet on the proper output queue. Virtual circuit and datagram are two forwarding mechanisms often employed in a real network. 6. Solution Techniques Centralised Solution Consider a network with N nodes and b links. The problem is to minimise the average delay T of equation (1). e. caused by the source-destination (S-D) pair m. M (m) f i if, there are M S-D pairs.