The same: Is the required connection settings from an input to an output request requests in a set of inputs and outputs (ITU-T) -Purpose: to set the transmission path from the source to the destination information in a fixed structure or through the network and the Center for a. switching channels: -Principle: is the type of switches serves the exchange of information by granting channel led directly to two objects using the -Handle the call proceed through three stages: setting channel, Canal maintenance, clearing the Channel Guide -Characteristics: Make the exchange of information between the two objects in real time. The object to use as the lead channel throughout the process of exchange of information Low performance Waste of time because the period setting and clearing the channel channel Information content do not carry address information Fit the voice service When the traffic increases to a certain threshold level, a number of calls that can be locked, the network denied any connection requests until may b. packet switching: -Principles: The data is divided into small packets of length changes, each package is assigned more address along with the necessary control information.-the Pack goes on in a node is stored into the buffer until the relegation was processed, then lined up in the waiting queue until it is passed on to the next line-In Centre , the package is a newsletter and be rearranged to put the device to receive data -Characteristics The transmission line can be combined using a large number of sources is relatively active. Thus the performance using the channel increase The average latency of transmission routes depend on load in the network Limit the status of network throughput and delay deterioration when the amount of information to be too large in the node. High reliability To prevent errors, packet switching networks using automatic modes re-ask At the Center, handles the signal error checking to determine if the package has a bug
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