AHSANUL KALAM

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Frame Relay is a packet switching methodology that is designed in the late 1980s and widely deployed in the 1990s. Frame Relay uses virtual circuits. These virtual circuits can be set up for each session (switched virtual circuits) or set up permanently (permanent virtual circuits). Frame Realy is designed for fiber optic cables with a very low bit error rate. Frame Realy has no error recovery and no flow control. Whenever a Frame Relay switch detects an error in a packet, it just discard the data. This results in a network with a low processing overhead and high transmission rates. The end system will have to take care of the data integrity.

Frame Relay is extensively used today in large corporations to interconnect the LANs between buildings. Frame Relay offers a corporation an alternative to sending its intra IP traffic over the public Internet, for which the corporation may have concerns about the reliability or the security. In this case the virtual circuits will be permanent.

sumber: http://www.telecomabc.com/f/frame-relay.html 

Packet switching is a method for sending data whereby the data is divided in packets. Each packet is given a header containing information of the destination. Each packet is forwarded through the network to the destination using this information. At the destination the data has to be reassembled from the received packages.

There are two common packet switching methods in use:

• Datagram Packet Switching:
  Each packet is forwarded independently based on the destination address. Routing decisions are made dynamically, so each packet may follow a different route and thus the packages may arrive out of order.
• Virtual Circuit Packet Switching:
  A route is set up prior to packets being sent. The packets will all follow this route. This makes the routing through the network very easy and the packages will be received in the correct order.

Packet-switched networks were originally designed to overcome the inherent weakness of sending data over the analogue circuit switched network. Circuit switching is not very efficië for small messages and the analogue circuits make the data subject to noise and errors.

The biggest packet switched network is the internet. The internet uses the datagram packet switching method.

sumber : http://www.telecomabc.com/p/packet-switching.html