XPost: uk.comp.os.linux, alt.comp.microsoft.windows   
   From: java@evij.com.invalid   
      
   On 2025-07-01 10:10, Jasen Betts wrote:   
   >   
   > On 2025-05-29, Java Jive  wrote:   
   >>   
   >> On 2025-05-29 19:48, Theo wrote:   
   >>>   
   >>> In uk.comp.os.linux Java Jive  wrote:   
   >>>>   
   >>>> As I understand, the two halves of those testers slide apart and you can   
   >>>> put one half at each end to perform the test.   
   >>>   
   >>> Do you need to see both ends to run the test, or is one sufficient?   
   >>>   
   >>> I saw a video showing that a green light on each part scans down the   
   numbers   
   >>> 1 to 8 then 'G'.  But I'm not sure if you are testing that the lights match   
   >>> at both ends, or if a fault is only shown at the end that detects it.   
   >>>   
   >>> (eg if you had open circuit at one end and a short at the other, what would   
   >>> it tell you?)   
   >>   
   >> Well, I've not used one, so I'm guessing based solely on electronic   
   >> logic.  Hopefully, if I'm wrong, someone will correct me.   
   >   
   > The scanning light testers give indication only that ther terminals   
   > are connected in the correctr order,  that catch more than 99% of all   
   > miswired connectors.... because usually you get one pair right.   
   >   
   >> 1)  If the cable was miswired by crossing two cables, then I'd expect   
   >> the lights at one end, most probably the remote end, to light in the   
   >> wrong order.   
   >   
   > Exactly that happens.  If the numbers "555" and "4017" mean anything to   
   > you you can probably guess how these devices are built.   
   >   
   >> 2)  If you have a short at one end, I'd expect two lights to be on at   
   >> the same time at least at that end, probably at both.   
   >   
   > Both ends show both lights at reduced brightness   
   >   
   >> 3)  If you have an open circuit, I'd expect the corresponding light at   
   >> one end or the other to fail to light.   
   >   
   > Yeah the unpowered end gets no light, the powered end gets a slightly   
   > brighter light. (assuming that the receiver is attached at the other   
   > end)   
      
   Thanks for the detailed explanation.   
      
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