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First off, I'd like to say that I'm new here and reading through most of these posts it seems the lot of you are probably the best resources to go to for help with my situation.
I had a customer come into my store today (I ran some of their ethernet cable a few months ago) and he hands me a cable that has a standard RJ 45 end on one side with a 4P4C (RJ 9 or whatever people want to call it) on the other. It is used for his cashlane system but the part I can't wrap my head around or figure out how to get to work is that the RJ45 has 5 (yes five) wires in it while the RJ9 has 4 wires.
The pin layout on the RJ45 is 1, 2, 3, 5, and 8 being terminated, and obviously all 4 are terminated on the other end. The kicker is that both pins 1 and 2 of the rj45 have continuity with pin 4 on the rj9, yet the rj9 only has one wire in the pin 4 slot. (The other three wires are straight through, no cross connectivity between any of them.) He needs another one of these cables because the company he purchased the cashlane from wil not send him another cable unless he purchases another cashlane for full retail.
Now I made a cable that tests the same for continuity as the one he has (I literally spliced in an individual piece of wire into the wire in pin 2 and terminated the end in the rj45 plug with the others in their spots.) So now pins 1 and 2 of the rj45 have continuity to pin 4 of the rj9 and the other three are in their respective slots with continuity as well. BUT, the cable doesn't work when he puts it into the system, is there something I did wrong, or some way of wiring this that I don't now about? Or easier yet, is there anywhere to buy this type of cable by itself without him having to pay a couple thousand for another cashlane system. Any help would he greatly appreciated, and I thank you in advance.
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Joined: Dec 2002
Posts: 9,423 Likes: 1
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Is this an april fools joke? LOL
You are talking about 8P8C and 4P4C. Forget the RJ designations.
It's probably some kind of weird serial cable...
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Apr 2011
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No, no joke, and sorry about the RJ designations...
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Joined: Oct 2009
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What is a cashlane system? Google was not my friend on this. If the old cable is expendable, then I would actually slice it open completely and look inside. Who knows what sort of hocus-pocus they might have brewed up in order to make the cable completely proprietary [and act as a hardware "key"]. It sounds like the cable is not expendable, however... BTW, the RJ9 plug is used only on high performance digital doorbells. See this post. Jim ************************************************** Speaking from a secure undisclosed location.
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Joined: Apr 2011
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It's a point of sale system, in this case a rather high tech cash register. Touch screen, network interface, etc... Unfortunately the existing cable is not expendable (even though I did want so very badly to take it apart). They already have 4 machines, this one is for the 5th. The company says that they only send the cable with the system itself. He never received the cable with his 5th system and the manufacturer is simply being stubborn.
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Joined: May 2002
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Put a wire map on the existing cable and see what you get and compare it to the one you made.
Retired phone dude
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Joined: Dec 2007
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I think what throws everybody off is the title of your topic: 8P 5C I'm not sure I know of very many 5C's But as Bill states: Wire Map and you can't go wrong.
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Joined: Apr 2011
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Originally posted by Professor Shadow: I think what throws everybody off is the title of your topic:
8P[b]5C I'm not sure I know of very many 5C's But as Bill states: Wire Map and you can't go wrong. [/b] I noticed that after i made the post, I chalk it up to either a typo or a simple brain lapse on my part since that end has 5 wires. I just don't have permission (or at least I don't think I do) to change the thread title. So if a Mod or Admin could change the title to say 8P8C to 4P4C it would be greatly appreciated.
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Joined: Oct 2009
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Are you saying that the customer bought a fifth unit, and it arrived without a cable? If this is true, then he is entitled to a refund. Most states have what they call a "Fitness of Merchantability" law, also known as "implied fitness for use." He should talk to his lawyer, unless he bought the fifth unit on ebay, in which case he is truly shafted.
It sure sounds like they are using the proprietary cable as a form of "hardware lock," hence their unwillingness to provide one.
Jim
**************************************************
Speaking from a secure undisclosed location.
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Joined: May 2002
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I changed the title as requested.
Retired phone dude
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