Cat 5, Cat 6 and Cat 7 Cabling

really im just looking someone to clear this issue up for me.
i know cat 5 cable will work up to a maximum of 80 meters but i heard cat 6 cables will work up to 550 meters and then i heard that there was cat 7 cables and i was wondering if someone could tell me the max distance that the different cables will work at if we have a 10/100/1000 network speed and ideally all the computers would run at 1gb speed.

thanks for your help
admoortownAsked:
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Copper cable - CAT5/5e/6/7 are all good to 100 meters.  The 80 meter number you heard was PROBABLY just to make sure you stayed under the limit.
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yasirirfanCommented:

All UTP cables CAT5/5E/6/7 standard distance is 100 meters. When it comes to UTP now way the distance is going to increase, it remains the same 100 meters maximum.

Here are some refrences

http://www.lanshack.com/cat5e-tutorial.aspx

http://www.siemon.com/us/standards/

http://grouper.ieee.org/groups/802/3/10GBT/public/jan03/cobb_1_0103.pdf

Al far as speed is concern it will warry depneds on the cable ur using CAT 5 can support 100 MBS

CAT 5 E - 1000 MBPS
CAT 6 - 1000 MBPS
CAT7 - 10 GB

Note all these cables are backward compatible, they can work at 10/100/1000 MBPS & CAT & can work 10/100/1000 MBPS /10GB too

Cheers

Yasir
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