comparison between atm and gigabit ethernet
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(ATM and Gigabit Ethernet)
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Introduction
The bandwidth hungry applications (such as
video conferencing) are rapidly increasing.
Need for Enterprises to upgrade their networks
and transmit data at faster rates
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ATM and Gigabit Ethernet
Enterprises are currently adopting these
technologies since they offer higher speeds and
are less expensive than the FDDI backbone.
Choosing the right technology to implement inthe network.
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ATM
(Asynchronous Transfer Mode)
ATM is a packet switching technology that uses
packets of size 53 byte also called cells. Each ATM
cell consists of a header of 5 byte length and 48 byte
payload. Its features are carried out via 3 lower level
layers.
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Advantages of ATM
It is a reliable technology that ensures high quality of
service features .
Efficient and high speed transmission of voice data .
Management of different types of traffic and
congestion control.
Convergence of voice, video and data traffic over high
bandwidth circuit with a single underlying switchingand transport technology.
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Advantages of ATM
Flexibility and high scalability in network size and
speed.
Can be used in different technologies (LAN, MAN
and WAN) and provides seamless end to endnetwork.
Single enterprise-wide solution and integration
savings.
Quite a few possible migration paths to ATM
network currently exist.
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Drawbacks and Challenges of ATM
1. Since ATM is connection oriented its
interoperability with the Ethernet LANs installed
base is difficult. .
2. ATM is more expensive than Gigabit Ethernetbecause installation, maintenance and employee
training are more complex.
3. Slow development of standards.
4. Migration to ATM is not very smooth due to
competition with existing protocols
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Gigabit Ethernet
The IEEE published the Gigabit Ethernetspecifications in 1996 and since then it has brought a
lot of interest in the network world.
Gigabit Ethernet is a frame-based protocol and itoffers a full duplex switch mode.
Its half-duplex mode will provide a network
compatible with the Ethernet and Fast Ethernet and
uses CSMD/CD protocol for reducing collisions insuch Medias.
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Advantages of Gigabit Ethernet
The interoperability in the LAN field is guaranteed.
Fast progress of technology and standard.
It can offer seamless migration from existing Ethernet
with minimum disturbance to the customers and theoffered services.
Cheap to deploy and easy to implement.
The ability to leverage existing Ethernet technology.
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Drawbacks and challenges of Gigabit
Ethernet
No QoS guarantee.
Less scalable and less reliable than ATM.
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Conclusion
Both technologies can co-exist in the futureeach will serve a different purpose.
Choosing the right technology mainly dependon the type of application not the bandwidthand speed only.
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Conclusion
ATM will serve a better purpose if the networkneeds QoS guarantee, a single LAN-WANbridging technology and integrated voice and
video
Gigabit Ethernet will be used if a simple
upgrade in an already existing Ethernetinvestment network is required.
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Future work
ATM network will appear as a broadcast LANto Ethernet devices and end stations, and
thereby connect to Ethernet desktops.
Researchers are developing some features that
would let Gigabit Ethernet move specified data
in a faster and more prioritized way.
Resource Reservation Protocol for Ethernet
technology.