Hi folks. Here's how rj45 cables should be made if you are using a hub.
Looking at the bottom of the plug with the end facing away, the colors
should be as follows, from LEFT to RIGHT. Note that the first color is the
main color, the second is the tracer or "stripe". This scheme complies
with TIA 568B standards. You should use cat 5 or cat 5e stranded wire if
these are for jumpers although you can use regular 24g 4pr if the wires are
not in flexing service. The actual pairs used for ethernet are 1&2 for
transmit data, and 3&6 for receive data. But it is better to connect them all.
1. white/orange
2. orange/white
3. white/green
4. blue/white
5. white/blue
6. green/white
7. white/brown
8. brown/white
If you need a cable redone, let me know or bring it along tonight.
Regards, Jim Darrough
At 06:34 PM 3/23/00 +0000, you wrote:
>Hi Paul.
>
> >> Is the network connection using BNC cable or twisted pair
> >> cable? If BNC cable, you can stop here as the rest of this
> >> doesn't apply, but please let me know so I know to ignore
> >> this as well.
>
> > I'm using twisted pair.
>
> >> Assuming the lead uses twisted pair cable, is it going
> >> directly between the two computers, or are there separate
> >> leads from each computer to a hub?
>
> > Each computer is connected to a hub.
>
>That's the exact case where I met this problem...
>
> >> Also, did you make the cable yourself from scratch; is it
> >> one you've bought in that's unmodified; or is it one you've
> >> bought in that you've shortened?
>
> > No the cables were premade and were included in the network
> > kit.
>
>In that case, you're going to hate what I'm about to say, but as
>a quick summary, you probably have a faulty cable.
>
>The required connections are symmetrical in this case, but
>there's no easy way of checking that they are completely correct
>other than taking the plug off one end and remaking it.
>
>The cable used is called "Twisted Pair" because it comprises four
>separate PAIRS of cables, and the members of each pair are
>twisted together along the whole length of the cable. The two
>wires that form each pair are also colour coded, one comprising a
>solid colour, the other being white with bands of that solid
>colour.
>
>Unfortunately, as the wiring isn't quite what one might at first
>assume, it is quite common for two of the wires that are white
>with a band of colour to get swapped over. The result of doing so
>is that the cable only works in one direction, which is exactly
>what you are seeing.
>
>If you hold the cable up, and slip the hoods (if fitted) off the
>plugs, you should find that the plugs themselves are transparent.
>Hold them side by side with the tab away from you, and you should
>be able to tell where the four wires with solid colours connect
>to. The pattern you should see is as follows:
>
> 1. One of the solid coloured wires goes into one of the end
> connectors. The matching white with coloured band should
> go into the adjoining connector at the same end.
>
> 2. Another of the solid coloured wires should go into the
> second connector from the opposite end. The matching
> white with coloured band goes into the adjoining end
> connector.
>
>Those two pairs are exactly as you might expect. Unfortunately,
>the other two pairs are not...
>
> 3. If you look at the third connector from the first end, that
> should also have a solid coloured wire going to it. However,
> the matching white with coloured band wire does NOT go into
> the adjoining connector, but to the third wire from the
> second end.
>
> 4. Finally, the fourth wire from the second end is the fourth
> solid coloured wire, and its matching white with coloured
> band is the fourth wire from the first end, thus adjoining
> it on the WRONG side.
>
>I would suspect that one of your cables has the two white with
>coloured band wires referenced in (3) and (4) above swapped
>over at ONE END ONLY. If so, you will need to return the wire in
>question to the shop you bought it from and get it replaced with
>a good one, or alternatively to strip the connector off and
>rewire it correctly. Unfortunately, the pliers needed to rewire
>those connectors tend to be expensive.
>
>Best wishes from Riley GM7GOD / KB8PPG.
>
>---
> * God Made 7 Greedy Old Devils
> * Kilroy Bought 8 Personal Pregnancy Guides
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