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Home » Forums » Forum Archives » Networking and Internet Sharing » Topic # 984

UTP Network Cable Lengths
jimpaka Jun-17-01 02:03 PM
Is there a minimum length that a UTP cable has to be between two devices? Can I use a small straight-through patch cable of 30cm (1 foot) to connect my server to my switch?

1. RE: UTP Network Cable Lengths
lbyard Jun-17-01 07:09 PM
In response to message 0
LAST EDITED ON Jun-17-01 AT 08:04 PM (GMT)

I can find no minimum length in the chunk of the specifications I have for 100BASE-TX cable. I read one Internet source that said it was .5 meters (1.6 ft.). I read others that said there was no limit. I have a 2-foot cable that works fine. There are loopback plugs that have almost no length. I would tend to make such a cable at least two feet long to permit some noise attenuation by the twisted pairs. However, RJ-45 plugs are cheap and one could experiment for a modest cost. Here are some basic 100BASE-TX horizontal distance requirements:

1.Total distance between an Ethernet Transmitter and Receiver: 100 Meters (328 ft., 109 yds., about the length of a football field)
2. Excluding patch cables, cross connects, etc., the maximum horizontal cable distance shall be 90m (295 ft.).
3. Cross-connect jumpers and patch cords in the cross connect should not exceed 6m (20 ft.).
4. 3m (9.8 ft.) has been allowed for patch cords from the telecommunications outlet/connector to the work area.
5. 10m (33 ft.) is allowed for the total length of patch cords and cross connect jumpers in a horizontal channel.
Larry


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