Forum Discussion
DrewE
Dec 25, 2014Explorer II
If you want to create your own cables (to get them exactly the right length or whatever), the tools and supplies to crimp the connectors are readily available and not too expensive and not really difficult to use.  Home Depot/Lowes have them, for instance, and at pretty affordable prices.  
Basically, you neatly trim the outer sheath off the Cat-5 or whatever wire, unsplay the individual wires and fan them out in the proper order, trim them evenly to length, and stuff them in their channels in the connector. Once everything is arranged neatly and properly, the connector is clipped into the crimper tool head, the handles pushed, and Bob's your uncle.
Cat-5 and similar twisted pair wire does have separate color-coded pairs of wires, usually one solid and one striped of the same color. For making a cable for a remote or something it doesn't matter much which pair is used where, but it may be important to keep paired wires paired, particularly for a long cable. For the 8 pin RJ45 connectors, generally the leftmost pins are a pair, the rightmost pins are a pair, the center two pins are a pair, and the leftover pins (numbers 3 and 6) are the last pair. For four-pin RJ11 connectors, the center two are a pair and the outer two are a pair.
For a manufacturer-specific cable, they can arrange things however they want, so carefully scrutinizing the existing cable and/or checking it with an ohmmeter or continuity tester to divine its wiring is necessary.
Basically, you neatly trim the outer sheath off the Cat-5 or whatever wire, unsplay the individual wires and fan them out in the proper order, trim them evenly to length, and stuff them in their channels in the connector. Once everything is arranged neatly and properly, the connector is clipped into the crimper tool head, the handles pushed, and Bob's your uncle.
Cat-5 and similar twisted pair wire does have separate color-coded pairs of wires, usually one solid and one striped of the same color. For making a cable for a remote or something it doesn't matter much which pair is used where, but it may be important to keep paired wires paired, particularly for a long cable. For the 8 pin RJ45 connectors, generally the leftmost pins are a pair, the rightmost pins are a pair, the center two pins are a pair, and the leftover pins (numbers 3 and 6) are the last pair. For four-pin RJ11 connectors, the center two are a pair and the outer two are a pair.
For a manufacturer-specific cable, they can arrange things however they want, so carefully scrutinizing the existing cable and/or checking it with an ohmmeter or continuity tester to divine its wiring is necessary.
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