Long Ethernet cable not working but short does for access point

Curtis_swan

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Mar 12, 2016
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I have two tp link w8970 routers. I have connected one as an access point. When I test it with a short 1 m LAN cable it works fine. But when I test it with a 50m LAN cable the router doesn't pick up that there is a cable connected. The long cable works fine though because if plugged directly into the pc the internet works. Any idea?
 
Well that is certainly weird.

Just to make sure
1m: works for both router-> pc and router -> access point
50m: works for router -> pc but fails router -> access point

Do you have a way to test the cable, it is possible the cable is broken and the PC can auto-correct it, and the access point cant.
Also is this a pre-made 50m cable or a homemade one where you get the bare cable and put the ends on?
 

Curtis_swan

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Mar 12, 2016
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Hi. Thanks for the reply. Yes the 1m cable tp access point works. The 50m cable to access point does not work. It was made up by a shop for me. So they just cut the length you require and put the heads on. On my other dlink router access point the 50m cable works. But on the tp link only the short cable works and is not picked up when using the 50m
 
It the AP being powered over the ethernet cable or does it have a external power block plugged into a power outlet.

If the AP used the standard version of PoE (ie 802.3af) that can go to 100 meters. If your AP is using some form of power injector many times these are using a proprietary form of PoE at lower voltages. There are issue going long distance with many of these.
 
I would take the cable back to the shop then and have them test the wire, ask them if they have a cable certifier that can test the speed.

Have you tried different ports on the router and on the AP? Possibly an issue with the port.
 
It is extremely common for a cable failure to be a poorly connected end. It will pass the tests with the really cheap meters that just have leds to show the how the pins are connected. It would fail if you used a actual certification meter. Some devices are much more tolerant of marginal cables.

It is in a way better when the pin is completely not connected at least it would be consistent between devices. I am somewhat surprised the shop did not actually test the cable with a meter. Everyone that has made cables knows they get them wrong from time to time.
 

Curtis_swan

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Mar 12, 2016
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My cable is run under my house. So unfortunately taking it out will be a major hassle. I'll just have to use the old router for now. Thanks for the help
 
It seldom is the cable itself unless it was somehow damaged. A option is to buy keystone wall jacks. These are now sold by most home improvement stores and some even have a plastic punch down tool. a small screw driver will also work. These are much simpler for a new person that the crimp on plugs. You would then need some short patch cables on each end.
 

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