Circuit
switching
It is a connection-oriented service. It establish a
dedicated connection i.e. a radio channel between the base and mobile, and a
dedicated phone line between the MSC(Mobile Switching Center) and the PSTN(Public
Switched Telephone Network) for the entire duration of a call. In Circuit Switching
each circuit cannot be used by other callers until the circuit is released and
a new connection is set up. Even if no actual communication is taking place in
a dedicated circuit that channel remains unavailable to other users. Channels
that are available for new calls to be set up are said to be idle.
Packet
Switching
Also known as virtual switching is a connectionless
service and allows a large number of data users to remain virtually connected
to the same physical channel in the network. Packet switching breaks each
message into smaller units for transmission and recovery. When a message is
broken into packets, a certain amount of control information is added to each
packet to provide source and destination identification, as well as error
recovery provision.
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