How do I make an RJ-45 connector into a hardware loop back device (is that an ethernet jammer in your pocket) ? (or how the hell do you boot an Indy with out an ethernet cable)

by jake

How do I make an RJ-45 connector into a hardware loop back device (is that an ethernet jammer in your pocket) ? (or how the hell do you boot an Indy with out an ethernet cable)

Required supplies:
2 strands (short) of coper from any normal cable (such as CAT-5)
1 RJ-45 head
Crimper (or other device to punch down the head)

To create the pocket sized wonder with many uses you simply connect pins 1-6 together with the first strand of copper. Then the second wire goes from pins 2-3.

(Also: don't forget your TIA/EIA wiring colors! Those colors are magical and make this work!)

If you have a fluke tester it will report the device as having a short on pins 1-6 and 2-3. This device is a way to have other devices treat it as if it has layer one connectivity.

The many uses of this are almost never ending.
Some ideas:

Plug into the ethernet port of your indy so it can boot without an ethernet cable.
Insert into free port of hub (quite fun).
Insert into free port on switch with a large broadcast domain (even if vlaning is in use this can be activated by pinging the broadcast or by any broadcast traffic that is in the same collision domain).
Give to local starbucks employee for t-mobile network fun.
Get extra credit in school.
Impress the ladies/guys.
Give them away and explain how they work.
Build them into each side of a cable and replace patch cable where needed (*wink*)

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