From its origin more than 25 years ago, Ethernet has
evolved to meet the increasing demands of packet-switched networks. Due
to its proven low implementation cost, its known reliability, and
relative simplicity of installation and maintenance, its popularity has
grown to the point that today nearly all traffic on the Internet
originates or ends with an Ethernet connection. Further, as the demand
for ever-faster network speeds has grown, Ethernet has been adapted to
handle these higher speeds and the concomitant surges in volume demand
that accompany them.
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The One Gigabit Ethernet standard is
already being deployed in large numbers in both corporate and public
data networks, and has begun to move Ethernet from the realm of the
local area network out to encompass the metro area network. Meanwhile,
an even faster 10 Gigabit Ethernet standard is nearing completion. This
latest standard is being driven not only by the increase in normal data
traffic but also by the proliferation of new, bandwidth-intensive
applications.
The draft standard for 10 Gigabit
Ethernet is significantly different in some respects from earlier
Ethernet standards, primarily in that it will only function over optical
fiber, and only operate in full-duplex mode, meaning that collision
detection protocols are unnecessary. Ethernet can now step up to 10
gigabits per second, however, it remains Ethernet, including the packet
format, and the current capabilities are easily transferable to the new
draft standard.
In addition, 10 Gigabit Ethernet does
not obsolete current investments in network infrastructure. The task
force heading the standards effort has taken steps to ensure that 10
Gigabit Ethernet is interoperable with other networking technologies
such as SONET. The standard enables Ethernet packets to travel across
SONET links with very little inefficiency.
Ethernet’s expansion for use in metro
area networks can now be expanded yet again onto wide area networks,
both in concert with SONET and also end-to-end Ethernet. With the
current balance of network traffic today heavily favoring
packet-switched data over voice, it is expected that the new 10 Gigabit
Ethernet standard will help to create a convergence between networks
designed primarily for voice, and the new data centric networks.
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