Maximum length of attenuation for twisted pair cables

1545 pts.
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Cabling
Networking
Twisted pair cables
What is the maximum length of attenuation for twisted pair cables?

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100M or just over 320 feet.

Twisted pair cabling standards for the most part are written for 100m total length including patch cords. The only exception is Category 6 supporting 10GBASE-T which is shorter and may vary by manufacturer and methods of mitigating alien crosstalk.

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  • Pressler2904
    ...assuming you are discussing 10- or 100-base-T (standard Ethernet or Fast Ethernet). The figure effectively drops for gig-e (1000-base-T). Note that the faster the speed and longer the run, the better quality cable is required: if running 300 feet with 10-base-T, cat 5 (possibly even cat 3) is fine. With 100-base-T, cat 5e would be requires, even though cat 5 is supposedly rated OK for 100Mb/s. Cat 6 is the way to go for 1000 base T at any distance, and you may need to shield the cable if there is any EMF source (ie: industrial equipment, fluorescent or Neon lighting, etc...) anywhere on the run...
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