LAN extenders as alternative to Fiber
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Posted by on February 1, 2006, 5:17 am
Please log in for more thread options 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 | ||||||||||||||||||||||
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Posted by DecaturTxCowboy on February 1, 2006, 8:51 am
Please log in for more thread options gautamzone@gmail.com wrote: http://netsys-direct.com/ethernet_extenders.php has 15 Mbps at over 3,000 feet. Simple solid-state telco line surge protection is adequate. | ||||||||||||||||||||||
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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 | ||||||||||||||||||||||
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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. | ||||||||||||||||||||||
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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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>
> 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?