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| Thread ID: 59910 | 2005-07-16 09:35:00 | using unused pairs in cat5 cable | personthingy (1670) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 372727 | 2005-07-17 05:04:00 | Pairs to use: it's up to you (as long as you use them in pairs, and use the same pairs at both ends). I'd use the colour code on the RJ45 to match the colours on pins 1&2, and 3&6 (which are the Ethernet pairs)..OK, so lets assume that i get a 40 metre moulded cable so everything is factory standard. I strip the outer insulation back, exposing 4 twisted pairs Which coloured pairs coincide with 1&2, and 3&6, and therefore can not be cut? Which coloured pairs are spare and therefore can be pulled sideways for alternative use? |
personthingy (1670) | ||
| 372728 | 2005-07-17 05:25:00 | Aha. You're going to cheat, intead of using sockets. ;) Hold one end of the cable with the plug pointing up, and the latch facing away from you. The pins are numbered 1..8 from left to right. You should be able to see the insulation on the wires through the transparent body of the plug. Each pair is "colour/colour+white". The pairs used by Ethernet are terminated on pins 1&2, 3&6. The spare pairs are on 4&5, 7&8. If the cables have moulded on protective boots and they hide the wires, you will have to use less elegant methods. You must have a multimeter. ;) Attach a pin to one probe. You will be able to get one probe to the contacts on the plug, and use the pin to contact the wire through the insulation. Like all such jobs, this requires (at least) 4 hands. Drag the sprog away from his other occupations to do some work. ;) |
Graham L (2) | ||
| 372729 | 2005-07-17 06:26:00 | Drag the sprog away from his other occupations to do some work. ;)Funny thing is he was just around, read this thread,got shown where the cable will be, and the work that goes into clearing the access, and he promptly went home to his mums :p O well, this one can take as long as he wants it to drag it out to. Bet he'll get motivated when he realises that the only net access from here on in will be through the cable he helps put in place ... Righto.. next steps, buy the cable, buy the irrigation tube, motivate Ziggy..... Thanks for all your help. |
personthingy (1670) | ||
| 372730 | 2005-07-17 07:29:00 | A normal CAT5e cable has 4 pairs of wires and depending on what standard has been followed, A or B, the colours will be, from pin 1-8, - Green/White - Green - Orange/White - Blue - Blue/White - Orange - Brown/White - Brown. Both ends will need to be the same if plugging into a hub/switch and a PC. If you want a crossover cable then one end will be as above and the other end will be - Orange/White - Orange - Green/White - Blue - Blue/White - Green - Brown/White - Brown. The orange and green pairs are used for 10/100MB network data and the blue and brown are not used. (I have seen 10/100 cables without the blue and brown pairs of wires in them but this is not normal) Normally you would use the blue pair for telephones as they are in the middle two pins of the plug just like a telephone RJ11 plug, which will fit into an RJ45 socket but not very snuggly. You only need all 4 pairs of wires if you are running gigabit network switches. |
CYaBro (73) | ||
| 372731 | 2005-07-17 08:22:00 | Righto.. I think ive got this.. If i buy, or get made a STANDARD cable, i can connect it between the wee hub in the sleepout, and the uplink port of my as yet unbought network switch in the main house. I can then strip the outer insulation back 200mm or so, and divert the blue/white and brown/white pairs and use one of them for the phone in Ziggys room and the other for something else...maybe. This is something i look forward to. Chris. |
personthingy (1670) | ||
| 372732 | 2005-07-18 05:21:00 | I strongly recommend looking at the plugs before cutting. The wires not to cut are those going to pins 1&2, 3&6. I have no faith at all in manufacturers following "standard" colour codes. Least of all when it "doesn't really matter" as in factory terminated cables, where the important thing is that pairs of wires are connected to the pairs of pins. I looked at a DSE cable last night. Despite the boots, the wire colours were visible. BTW use a straight cable, not a crossover. You'll be using a hub at the far end, so that's what's needed anyway. |
Graham L (2) | ||
| 372733 | 2005-07-18 06:39:00 | A while ago I brough a pre wired spliter for running 2x Ethernet connections down the same Cat5 cable. I think worked with phone as well (we had a PABX and everything running through RJ45s) It might just be easier, and less error prone than doing the cutting and wiring yourself. Here are a bunch of pre-wired options (www.cdynamics.co.nz) Don't let me discourage you though.. It's fun :-) -Qyiet |
qyiet (6730) | ||
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