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Using Fiber
to extend the range of Ethernet
A user wrote in with an
example of using Ethernet to Fiber converters to span great
distances on a property. Now that Ethernet to fiber converters
are less than $200, it is not unreasonable for a home network to
incorporate fiber.
Simon Mackay wirtes:
In Australia, we have a lot of properties in
the outer suburbs which have small bungalows that have been set up
simply as extra living space. Typically, these places would be
connected to the main property's electricity and water supply and
may have a telephone service, either as part of the main building's
service or with its own direct connection to the exchange.
You made some reference to fiber-optic runs
and Ethernet-Fiber converters in your article about Ethernet
networks. Here you cited an application where the places may be
between 100 meters - 40 kilometers apart; or you are linking two
homes, each with different ground potentials. This is also because
Ethernet - Fiber converters had come down in price, making them
available for residential and similar-class users.
The same technology could be useful where
there are multiple outbuildings on a property; such as most country
properties. Here, the buildings could be interlinked using fiber,
thus permitting electrical isolation and ensuring improved data
quality between the buildings.

An example setup could be a farm which
comprises of the farmhouse or homestead; a barn located 50 metres
away from the farmhouse; a two-bedroom cottage which is used as a
guesthouse located 10 meters from the farmhouse and a machinery shed
located 100 meters from the barn, 150 meters from the farmhouse as
the crow flies. The property has its Internet access provided by a
Starband-style two-way satellite broadband Internet which is
connected to a "beige-box" desktop running Windows XP ICS and
installed in the farmhouse. There is another "beige-box" being used
by the children for games and the farm accounts are done using
another cheaper computer in the barn. The farmer has shown interest
in the Axis Ethernet CCTV cameras and wants to deploy them in the
machinery shed and the barn for security purposes -- keep an eye on
the barn and the machines from any computer on the property. There
are also plans to provide Internet access for those who are using
the cottage

Each building would be equipped with an
Ethernet switch and a fiber link using newer cost-effective fiber
adaptors and fiber cable would occur in this fashion.
Cottage (5-port switch) - Farmhouse (8-port
switch) - Barn (5-port switch) - Machinery shed (5-port switch).
Logically, this network would appear as one
subnet, with the Internet gateway at the farmhouse. All nodes except
the Axis cameras and the Internet gateway would become DHCP clients,
while the cameras would be assigned static IP addresses close to the
top of the network range. This is because the Windows DHCP server,
like most DHCP servers, is known to "dish out" IP addresses by
working upwards.
With regards,
Simon Mackay
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