How long can a cable be
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Posted by James Knott on February 22, 2005, 12:30 pm
Please log in for more thread options Justin Time wrote: ??? The 100 metre (328") limit on cat 5, is due to signalling limitations, in that the signal will deteriorate too much beyond that. Back in the days of 10base2 and 10base5, the distances, over coax, were significantly greater. Why would fibre be limited to 100 M? | |||||||||||||||||||||||||||||||
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Posted by jtodd5 dot 1 on February 22, 2005, 6:03 pm
Please log in for more thread options James Knott wrote: > Justin Time wrote:
> > >>No, just kidding. Anything over 328 feet use fiber...else Cat 5e
>> >> >>Actually, the 328 foot limitation goes for fiber as well if it is used >>as a horizontal link. It is only up to 2Km if it is used as a backbone. >
> > ??? > > The 100 metre (328") limit on cat 5, is due to signalling limitations, in > that the signal will deteriorate too much beyond that. Back in the days of > 10base2 and 10base5, the distances, over coax, were significantly greater. > Why would fibre be limited to 100 M? > The 100 Meter limit is a Standard based length that represents the lowest common demoninator of the manufactures involved in the standards creation proccess. As for the techincal limit, I've seen a 100MB link work on Cat5 at 425 feet and know of a 100MB link running on Cat6 at 630 feet. I don't know where the actual drop off is for when a given ethernet link will drop connection based on length. As for the fiber limit of 100 meteres, this applies only to horizontal cable and was chosen so that the fiber and copper standards were similar in the horizontal, not from a particular technical stand point (as far as I know). | |||||||||||||||||||||||||||||||
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Posted by Perkowski on February 22, 2005, 2:56 pm
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Justin Time wrote: > No, just kidding. Anything over 328 feet use fiber...else Cat 5e
> > > Actually, the 328 foot limitation goes for fiber as well if it is used > as a horizontal link. It is only up to 2Km if it is used as a backbone. > Ya I know. But it will still work over 328 regardless, even though it isnt EIA/TIA spec. | |||||||||||||||||||||||||||||||
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Posted by Mark J on March 9, 2005, 2:44 am
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If you're going from the patch room to the wall plate, I think the actual physical max length to meet standard for Cat 5 is about 90 meters for the run from the room to the outlet; the other 10 meters is to allow for patch cables at each end. You can get away with a little more if you don't have that long of patch cables to use. But if you can afford to, use fiber...it'll save trouble in the long run when you upgrade. >I have to connect 4 3com superstack switches as one unit. 3 of them
> are standing in a patch room (no problems) but the fourth one a have > to take to a another level in the building. Witch cable do I use > (cat5,cat6 or fiber or ????) and how many meters may this cable be? > > Thanks > Crack4u > systemengineer | |||||||||||||||||||||||||||||||
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> Actually, the 328 foot limitation goes for fiber as well if it is used
> as a horizontal link. It is only up to 2Km if it is used as a backbone.