Evaluating STP Quality for Gigabit Ethernet
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Posted by Will on July 22, 2006, 9:15 pm
Please log in for more thread options We are converting over our network slowly to gigabit ethernet, and I wanted to better understand how I can evaluate the quality of the existing copper wiring. We are in a building where the twisted pair wiring was done maybe 15 years ago, and the quality is not very high. I doubt that the patch panels are rated for gigabit ethernet, nor is the twisted pair wiring in the building probably. On the other hand, our runs are extremely short, with maybe 5000 sq feet of office and lab space surrounding a computer room where the wiring terminates. What distance can gigabit ethernet run reliably over non-qualified CAT5 cabling? What is the cheapest tester that would give us some way to characterize the quality of patch cables as well as wiring at each wall jack in the building through to its patch panel in the computer room? -- Will | |||||||||||||||||||
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Posted by DLR on July 23, 2006, 2:38 am
Please log in for more thread options Will wrote: First off are you sure it even has all 4 pairs connected? > What is the cheapest tester that would give us some way to characterize the
> quality of patch cables as well as wiring at each wall jack in the building > through to its patch panel in the computer room? It's hard to imagine you'd get enough positive results to make it worth testing any of it. I'd just take the testing budget and put it into the upgrade plan. If you are moving to gigabit then I'm sure you're also moving to managed switched. Right? So to make sure you have a mess, hook up your new managed switch to a few runs and walk around the office with a gig laptop and try to watch some streaming video with it. While doing this see what the connection rate is for the laptop and see what the switch is getting for error rates. | |||||||||||||||||||
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Posted by Robert Redelmeier on July 24, 2006, 2:09 pm
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> We are converting over our network slowly to gigabit ethernet,
> and I wanted to better understand how I can evaluate the > quality of the existing copper wiring. We are in a building > where the twisted pair wiring was done maybe 15 years ago, > and the quality is not very high. In 1991 you'd be luckly to get wired with Cat3. That isn't spoec'd for 100 MHz. are you running 100baseTX successfully? Min errors, congestion or retransmits? If it won't run 100FD, there isn't a prayers of it running gig. > On the other hand, our runs are extremely short, with maybe
> 5000 sq feet of office and lab space surrounding a computer > room where the wiring terminates. Short helps. But some of your runs are probably 100ft, about 1/3 the max. > What is the cheapest tester that would give us some way
> to characterize the quality of patch cables as well as > wiring at each wall jack in the building through to its > patch panel in the computer room? Try running `ttcp` software on two machines and see if you get wirespped. Also try full duplex. -- Robert | |||||||||||||||||||
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Posted by Will on July 24, 2006, 4:19 pm
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> In 1991 you'd be luckly to get wired with Cat3. That isn't
> spoec'd for 100 MHz. are you running 100baseTX successfully? > Min errors, congestion or retransmits? If it won't run 100FD, > there isn't a prayers of it running gig. You would think, yet we have gigE NetGear GS116 switches in individual rooms uplinked to GSM7224 layer 2 switches in the central room, and I have yet to see a single error reported on any switch. I'm not believing the report somehow. > > What is the cheapest tester that would give us some way
> > to characterize the quality of patch cables as well as > > wiring at each wall jack in the building through to its > > patch panel in the computer room? >
> Try running `ttcp` software on two machines and see > if you get wirespped. Also try full duplex. Where can I get a ttcp that would run on Windows command line? -- Will | |||||||||||||||||||
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Posted by Robert Redelmeier on July 24, 2006, 6:21 pm
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>> In 1991 you'd be luckly to get wired with Cat3. That isn't
>> spoec'd for 100 MHz. are you running 100baseTX successfully? >> Min errors, congestion or retransmits? If it won't run 100FD, >> there isn't a prayers of it running gig. >
> You would think, yet we have gigE NetGear GS116 switches in > individual rooms uplinked to GSM7224 layer 2 switches in the > central room, and I have yet to see a single error reported > on any switch. I'm not believing the report somehow. Why do you believe that links are being run at 100, let alone gig? Some very smart equipment falls back to 10. Almost all will fall back to 100. > Where can I get a ttcp that would run on Windows command
> line? Search for ttcp or ttcp.exe ? -- Robert | |||||||||||||||||||
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> to better understand how I can evaluate the quality of the existing copper
> wiring. We are in a building where the twisted pair wiring was done maybe
> 15 years ago, and the quality is not very high. I doubt that the patch
> panels are rated for gigabit ethernet, nor is the twisted pair wiring in the
> building probably. On the other hand, our runs are extremely short, with
> maybe 5000 sq feet of office and lab space surrounding a computer room where
> the wiring terminates.
>
> What distance can gigabit ethernet run reliably over non-qualified CAT5
> cabling?