LAN extenders as alternative to Fiber

LAN extenders as alternative to Fiber
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Subject Author Date
LAN extenders as alternative to Fiber gautamzone 02-01-2006
Posted by on February 1, 2006, 5:17 am
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Hi friends,

I got a query from a customer asking if he could use LAN extender
instead of using Fiber whenever distances crossed 100 m. I did not have
any convincing answer to give him. Thats why I am posting here a
question to know if LAN extenders can be used instead of Fiber? If yes,
will there be any performance degradation? What is the max throughput
one can get from LAN extenders? Also are LAN extenders the only
alternative to fiber?

Looking forward for someone to shed some light on this.


Thanks a lot
Regards
Gautam


Pure Networks
Posted by DecaturTxCowboy on February 1, 2006, 8:51 am
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gautamzone@gmail.com wrote:
> Hi friends,
>
> I got a query from a customer asking if he could use LAN extender
> instead of using Fiber whenever distances crossed 100 m. I did not have
> any convincing answer to give him. Thats why I am posting here a
> question to know if LAN extenders can be used instead of Fiber? If yes,
> will there be any performance degradation? What is the max throughput
> one can get from LAN extenders? Also are LAN extenders the only
> alternative to fiber?

http://netsys-direct.com/ethernet_extenders.php has 15 Mbps at over
3,000 feet. Simple solid-state telco line surge protection is adequate.

Posted by Robert Redelmeier on February 1, 2006, 9:33 am
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In comp.dcom.cabling gautamzone@gmail.com wrote in part:
> I got a query from a customer asking if he could use
> LAN extender instead of using Fiber whenever distances
> crossed 100 m. I did not have any convincing answer to give
> him. Thats why I am posting here a question to know if LAN
> extenders can be used instead of Fiber? If yes, will there
> be any performance degradation? What is the max throughput
> one can get from LAN extenders? Also are LAN extenders the
> only alternative to fiber?

If it's just distance, you can often push distance limits
by using better cable. 10baseT will often do 200m on Cat5
cable and 100baseTX might carry 150m on Cat6.

But long distances often mean interbuilding (actually, active
equipment on different groundstakes) and that requires serious
protection against lightening caused surge damage.

Good extenders should either have this built-in, or
specify that telco-type protectors are sufficient.

-- Robert


Posted by w_tom on February 1, 2006, 9:52 am
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Point by Robert Redelmeier is important. One building can become a
lightning rod that conducts direct lightning strikes through all
network interfaces in the other building. Technology well proven even
before WWII and that is standard in every telephone switching station.
All utility and communication cables must leave at a common service
entrance so that each protector makes a short connection to the common
earth ground. Where does AC electric and phone line enter the
building? Where do both share a common earth ground? That is where an
inter-building LAN cable must exit and enter so that each LAN protector
makes a less than 10 foot connection to that single point earth ground.

gautamzone@gmail.com wrote:
> I got a query from a customer asking if he could use LAN extender
> instead of using Fiber whenever distances crossed 100 m. I did not have
> any convincing answer to give him. Thats why I am posting here a
> question to know if LAN extenders can be used instead of Fiber? If yes,
> will there be any performance degradation? What is the max throughput
> one can get from LAN extenders? Also are LAN extenders the only
> alternative to fiber?
>
> Looking forward for someone to shed some light on this.


Posted by Robert Redelmeier on February 1, 2006, 11:01 am
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> Point by Robert Redelmeier is important. One building can become
> a lightning rod that conducts direct lightning strikes through
> all network interfaces in the other building. Technology well
> proven even before WWII and that is standard in every telephone
> switching station. All utility and communication cables must
> leave at a common service entrance so that each protector makes
> a short connection to the common earth ground. Where does
> AC electric and phone line enter the building? Where do both
> share a common earth ground? That is where an inter-building
> LAN cable must exit and enter so that each LAN protector makes
> a less than 10 foot connection to that single point earth ground.

Exactly! It gets even worse: A direct lighting strike to a building
is not required. Any nearby (100m) strike may elevate one building's
groundstake much more than another's. Then any direct conductive
connection becomes a new groundpath.

-- Robert


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