ATM Lines
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ATM Lines
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 switching’s 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 byte.”Tcom 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...
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