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Extending Ethernet beyond 100m

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Name: nolanpro
Date: November 25, 2006 at 11:09:14 Pacific
OS: Windows
CPU/Ram: na
Product: na
Comment:

I was wondering what anyones thoughts are on this. I have cat-5 run to a separate building that’s about 380 feet away. It looks like Ethernet is only good for 328 feet. I plan on having a switch on each end. Would you recommend putting a (rather expensive) Patton extender on each end or maybe just try to find a router/switch that puts out just a little bit more power than standards? Any thoughts? (If I could do it over again I would have put in fiber, oh well) Thanks!




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Response Number 1
Name: FishMonger
Date: November 25, 2006 at 11:37:55 Pacific
Reply:

380 feet is too far for cat5 no matter what you do at each end. You'll need to add a switch in the middle, or spend the extra money and replace the cat5 with fiber.

If you don't like those options, then (if you're luky) you might be content with a poor 10Mb connection instead of the 100Mb.


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Response Number 2
Name: tonysathre
Date: November 25, 2006 at 12:13:57 Pacific
Reply:

A switch isn't needed if it's only a single connection. Get a repeater.

It'll save you money.
"Computer security." — Oxymoron


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Response Number 3
Name: LinuxOS2
Date: November 25, 2006 at 12:25:28 Pacific
Reply:

I have seen lenghts beyond 350' that would work but as stated you will be running at 10 mps, not the worst thing...
Just for your information it is not the power level that cause the restriction with length it is collisions of the signal within the cable.
Fiber,repeter,hub,wireless you do still have some options, sounds like you have it in place run it as is and see what happens

Keep the old stuff running


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Response Number 4
Name: Social Engineer
Date: November 25, 2006 at 15:09:10 Pacific
Reply:

Simply add a repeater at 190 ft. Network repeaters regenerate incoming electrical, wireless or optical signals to preserve signal integrity and extend the distance over which data can travel. With physical media such as Ethernet, data transmissions can travel only a limited distance (100 Meters) before signal quality degrades. By limiting the maximum distance of each segment to 190 ft. you ensure that you will have a quality signal and good performance.


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Response Number 5
Name: jefro
Date: November 25, 2006 at 16:13:53 Pacific
Reply:

The maximum is not that it won't work. It will work. It will not operate at the full rated speed. If you protect that data to be sure only useful data can go across it you would be OK most likely. Use stats to see if you might need a device between it. A simple hub might suffice.

I read it wrong and answer it wrong too. So get off my case you goober.


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Response Number 6
Name: Curt R
Date: November 26, 2006 at 06:20:32 Pacific
Reply:

I have seen lenghts beyond 350' that would work but as stated you will be running at 10 mps, not the worst thing...
Just for your information it is not the power level that cause the restriction with length it is collisions of the signal within the cable.

Wrong!

The problem is not collisions or lack of "speed". The problem is attenuation (ie: signal degradation). It might work, and I stress might, but at best your signal will be sporadic (ie: you'll have frequent losses of connectivity) and you will get data corruption.

Ethernet networks are contention based. Regardless of cable length, if you have multiple users on a segment, you will have collisions. Although a proper switched network can and will reduce collisions.

I don't know where some of you guys get your info....



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Response Number 7
Name: XpUser
Date: November 26, 2006 at 07:15:39 Pacific
Reply:

I don't know where some of you guys get your info....

Brilliant! :-)

i_XpUser


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Response Number 8
Name: Social Engineer
Date: November 26, 2006 at 09:59:51 Pacific
Reply:

“I don't know where some of you guys get your info....”


I don’t know where they get there information either. I think some of these guys are just making stuff up as needed. These are some perfect examples of how a little knowledge can be dangerous.


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Response Number 9
Name: LinuxOS2
Date: November 26, 2006 at 19:03:52 Pacific
Reply:

Typical causes of late collisions are segment "Cable Lengths" in excess of "The Maximum Permitted For The Cable Type", faulty connectors or improper cabling.
I myself draw my "INFORMATION" from the IEEE standards...sorry I did not dream them up I only work within there limits.....


Keep the old stuff running


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Response Number 10
Name: heropsycho2177
Date: November 26, 2006 at 23:46:14 Pacific
Reply:

"A switch isn't needed if it's only a single connection. Get a repeater.

It'll save you money."

I can buy a 10/100 switch for $10. Gigabit for $30...

Not sure it's gonna save you money.

"Typical causes of late collisions are segment "Cable Lengths" in excess of "The Maximum Permitted For The Cable Type", faulty connectors or improper cabling."

That's just some of the problems you'll have. Curt R is right.

Ask yourself why it only works at 10M/sec or at a reduced rate. Packets are being dropped and then retransmitted because of collisions, but also corruption of the packets due to a poor signal quality.

Please help survivors of Hurricane Katrina!

www.redcross.org


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