Theme: Data transmission based on channel and packet switching

Transfer to the establishment of a logical connection

5-picture. Transfer to the establishment of a logical connection

Procedure for harmonization of the two end nodes of a network of some parameters of packet exchange process is called the establishment of a logical connection. Options negotiated by the two interacting nodes, called a logical connection parameters.

Virtual channel

6-picture. Virtual channel

The only pre-padded fixed route connecting end nodes to the packet-switched network, referred to as a virtual channel (virtual circuit or virtual channel). Virtual channels are laid for sustainable information flow. In order to isolate the data flow of the total traffic flow of each packet is marked with a special kind of sign - label. As with the establishment of a logical network connections, the virtual channel begins with a gasket from the source node a special package - the connection request.

Table switching networks using virtual channels is different from the switching table in datagram networks. It contains entries only passing through the switch virtual channels, and not all the possible destination address, as is the case in networks with datagram algorithm transfer.