Cable setup for Ethernet RJ45 connections
Cable setup for Ethernet RJ45 connections
The sequence doesn't affect the outcome since the wire strands remain identical at each end.
There are both straight-through and crossover options available. Contemporary network cards automatically detect connections, making it possible to use either type now. Previously, you needed a straight cable to reach a router and a crossover for PC-to-PC links. Some specialized setups may require proprietary methods like roll-over, but these are rare and limited to certain devices.
It really counts because each twisted pair needs to match a differential pair to ensure optimal rejection of EMI noise.
I interpreted the request as wanting the wires to follow the same sequence at each end, and I asked whether the arrangement between ends affects the outcome. My reply confirmed that the sequence doesn't matter as long as it's consistent on both sides of a straight cable. If I misread, I apologize.
The arrangement is important. For a standard Ethernet cable, choose one of the two configurations and keep that choice consistent on both ends. The preferred option is the B variant, where the white-orange wire is positioned first (when you examine the connectors with contacts at the top and a clip at the bottom). A typical cable maintains the same wire sequence on either side. If you need to link two computers without a switch, in earlier 100 Mbps network cards you had to use a crossover cable that swapped the transmit and receive pairs on one connector. Today’s network cards automatically recognize the wires and their functions, so you don’t need a crossover cable unless you specifically want to. For gigabit speeds, you must rearrange all four wire pairs, as shown in the diagram (keep one connector unchanged while swapping the others). 100 Mbps cards didn’t support auto-detection, requiring a manual crossover. However, since they only use four wires for data transmission, you can create a simpler crossover by separating one pair and leaving the rest untwisted. This method works only at 100 Mbps. Using it with gigabit cards may cause issues because they expect all pairs to be rearranged automatically. For 10 or 100 Mbps speeds, you can often just pick any two wires for transmit and receive, such as white-blue for 1+2 (transmit) and white-brown with brown for 3+6 (receive), leaving the rest untouched. Many people saved cables by adding extra Ethernet ports at one end, using only four wires instead of the full set. This setup lets each pair handle its own data flow, ensuring proper operation.
Sure, I just prefer avoiding the need to cross wires, which makes maintaining their sequence difficult. I’m considering grouping matching colors together or placing them side by side rather than following the standard arrangement. Green next to green, white beside white, and blue-blue with white, for example.
Take out 50mm of wires, let them loosen gently, sort them neatly, and smooth them out by rubbing your fingers over them several times. Cut them down to size, then place them into the socket.
Which connector are you employing? I know three types: CAT5, CAT6, and CAT6 with a cover; the latter tends to be the most convenient to handle.