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The Evolution In nature evolution occurs throughout various different things Also evolution occurs in technology Take for instance ATM was an evolution of frame relay and frame relay was an evolution of packet switching Evolution happens everywhere but in technology it happens all the time Packet switching technology breaks down messages into fixed-length pieces called packets and sent through a network individually In packet switching messages are segmented into packets of a pre determined size before they are sent This process is called packetizing The packets are normally 1000 bytes long There is a lot of error protection in the packet Packet switching networks are made to run several alternative high-speed paths from one node to another For instance if a node from San Francisco is trying to send a message to Los Angeles and the connection is busy or down it will redirect its message to Denver then to Los Angeles as an alternative route Frame relay is packet switchings next of kin Frame relay evolved from packet switching Instead of sending packets frame relay sends frames A frame has a one-byte header two addressing and control bytes a variable-length data field 1-64000 bytes a 16-bit cyclic redundancy check and a termination byteTcom book In frame relay there is hardware on both ends of the connection that builds and breaks down frames They do this through all kinds of data streams LAN packets digital voice and asynchronous terminal input and the hardware writes the frames serially The reason frame relay is more popular and better evolved than packet switching is that it uses commonly available circuits which provides good throughput and has low latency and is easy to configure Packet switching is only good for data transferring and is sent through one type of line Frame relay sends more information faster and through multi forms of connections This makes packet switching not the suitable choice for ISPs Thus leaving packet switching
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