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Using RJ11 for networking?

This is a discussion on Using RJ11 for networking? within the Cabling and Network Cards forums, part of the Tech Support Forum category. Don't ask me why, but can i use a standard 4p4c telephone wire for networking? A regular 100MB Ethernet connection

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Old 08-25-2010, 01:59 PM   #1
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Don't ask me why, but can i use a standard 4p4c telephone wire for networking?
A regular 100MB Ethernet connection only uses 4 of the actual wire in an RJ45.
I really don't care about the speed that would be associated with (Cat3?) untwisted wire. Would i have to buy Rj45 modules to put on the wire?
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Old 08-29-2010, 12:31 AM   #2
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CAT3 cable is twisted, just not as much, but it's only rated for 10 MB, not 100 MB. It may work for short distances, like for a temporary patch cable replacement, but I wouldn't use it for anything permanent. 6 months from now a simple change in the environment could give you all kinds of trouble, and you might not relate it to using CAT3 instead of CAT5/CAT5E cable.
Not worth the difference in cost.

The flat untwisted cable often used for connection a phone to the wall would not be reliable at all.

You'd have to use the RJ45 connectors. The 4P4C will plug into an RJ-45, but connects to pins 3,4,5,6. Any Ethernet device uses pins 1,2,3, and 6, so that won't work.
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