I'm confused. Isn't this tool known as "your eyes"?
IPVMU Certified | 01/16/15 03:37pm
The only way something like this would work is to have an alternative way to terminate the open end. This would just add another step. IMO you are just better off making sure the techs doing the work understand how the ends should be terminated. As above a visual inspection is enough to know if its terminated correctly. An experienced tech can usually see if an end is bad with a close inspection.
I really dont something like this as a time/labor saving method.
IPVMU Certified | 01/16/15 03:39pm
No because, you are testing the order of the wires not the color. so you need both ends done.
IPVMU Certified | 01/16/15 04:28pm
I don't think there's a tool like this, and here's why:
Color Order Varies: There is nothing magical about the color of the stand vs. what it can be used for in a bundle. The color order 'standard' even varies into substandards! (TIA 568A vs B)
The bottom line: As long as an installer remains consistent, even a non-standard color order will technically work just fine. (Not advisable by any means, but true.)
Circuits Must Have Continuity: In order to check one end, both ends need to be connected. There are some very high-end cable certifiers that will tell you if particular strands are not making a connection or are botched up, but even those machines need both ends terminated to confirm electron flow is correct.
Checking both ends mean terminating them both, or your tech needs to be familiar with a toner probe to check bare strands, which usually takes more precision/skill than simply terminating the cable properly to begin with.
I'm not sure what LAN tester you have, but This checker is about $175 and tells you if pairs are crossed up:
If I were in your shoes, I'd get a device like this, and force my techs to terminate and check a bunch of 3' patch cables from a partial box of cable one day in between jobs. A 'rainy day' task, if you will.
Practice makes perfect. I think after an hour or two of crimping ends and checking them, they will be 'experts' in the field when it counts.
Thanks for your info , I do know all this , i think i will issue everybody with a good quality magnifying glass, as I find its the best way to check the colours are correct on the J45 plug after crimping
Just wondered if their was a new magical tool on the market
IPVMU Certified | 01/16/15 05:27pm
Brian, I disagree on a couple of points: While, yes, there will be pin-to-pin electrical continuity so long as the two ends match, the 'self-shielding from interference that the twist in the pairs brings it very important - at least in Pairs 2 & 3 (the orange & green, or green & orange), which are your transmit/receive data connections. The performance of the cable can be impacted if these pairs are not used as designed. Pairs 1 & 4 are usually involved in PoE and don't have the same signal delicacy that the data pair have.
Another key reason to stick to the standard is follow-on service. Anyone who make a change after the initial off-standard installation will be dumbfounded (and time-wasted) when faced with a unique pin-out 'personal style' of the original, lazy installer. Using the T568A or T568B style means a tech only has two options. There is some debate as to which is most-commonly used, though most IT Directors of larger systems ususally have a set-in-stone facility-wide requirement (this is partly to avoid the crazy confusion that would be introduced by a tech's personal 'style').
I've known the tester that confirms correct wiring as a 'wire mapper' - this one is $50, but practically disposable knock-off versions can be had for as little as $12 plus the cost of a 9v battery from any discount electronics shop). On the other hand, true certification meter like this Fluke instrument can set you back almost $10,000. It provides the documentation required for certified/lifetime warranteed installations.
IPVMU Certified | 01/16/15 05:41pm
We have used the RWC1000k. It isn't too expensive and is a nice middle road between an official certifier and a basic cable tester.
Not affiliated with them in any way, I just have one sitting on my desk and have used it successfully a number of times.
IPVMU Certified | 01/17/15 06:42am
When I first started doing networking, I found and used the EZ-RJ45 system because I liked that the wires came through the connector making verification before crimping easier. I still use the crimper but at some point I didn't see the advantage anymore as I was paying more per connector than a standard 8P8C connector and I wasn't saving much time.
I mostly use a bright head lamp and verify the color scheme (I use 568 unless I need a crossover cable) and then slide the wires in the connector and verify again looking carefully through the clear plastic. A magnifying glass would be helpful if the tech's eyes are not very good. I still may make a mistake every now and then and need to re crimp a connector but will see that on a simple tester and have never needed to go past that.
I do know that at one time I had poor CAT cable from Home Depot where the colors would flake off the striped conductors and the solid conductors were very pale. This made termination painful. I'm not sure I finished using that box.
IPVMU Certified | 01/19/15 06:42pm
Electrons, are not color-blind after all. :) Theoretically, there might be a way for this tool to work on an electrical, not optical, level. Consider that to reduce crosstalk, the pairs are actually made with slightly different twist frequencies, like this cat 5 example:
A singly terminated and energized cable pair acts like a long capacitor and therefore will present a (ever so slightly) differing capacitance/reactance depending upon the turns per meter. Which could be used (relatively) to distinguish the pair from the others. Maybe some high-end tool does this already?
Why it might not be practical:
Detection of differing reactance too expensive for commercial tool
Possible varying - non-standardized TPM between manufacturers/categories of cable