Long cable run not working

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Tom Farrow

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Oct 13, 2013
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Hi

I just got home from installing about 70 meters of CAT5e in a school building, for a fitness centre operating (for whatever reason) inside of it. Everything went well, cable is installed, punched down okay, I didn't *completely* powder myself in ceiling tile dust.

Just one issue. It doesn't work.

My tester reveals that pins 1-6 are working (using 7+8 for phone). Plug a laptop in, nothing. Wireless access point, nothing.

Taking a guess, I'm thinking maybe I need to use the actual pairs? I used brown instead of green because I messed up when punching the green. But I still proceeded to use the green+white correspondent to it's pair.

When plugging in the laptop, I see windows try and connect for a second or two, then says not connected, then occasionally it says identifying, but comes up with not connected again. Shows the cable as not connected.

Would my assumption about using pairs be correct? Should I switch my green+white for a brown+white/brown for green (doesn't matter really)? Or is there something else I might be overlooking?
 
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Zooshooter

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Feb 8, 2013
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The colors of the pairs don't have significance outside of helping you keep the wiring in order. You CAN substitute any particular wire for any other, as long as BOTH ends of the cable reflect that setup. To keep things simple I just follow the standardized layout for making cables.
 
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Tom Farrow

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Oct 13, 2013
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Yeah, I know the colours don't matter.

But... what about twists? The twists are designed to screen interference. Therefore, do I need to ensure that each theoretical pair that I punch down as, is actually a twisted pair in the cable?
 
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Tom Farrow

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Oct 13, 2013
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Hmm, I've re-terminated at least a dozen times now, both at the faceplates and at my junction point.

I'm really expecting interference to be the cause here, I just can't pinpoint where its coming from.
 
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Zooshooter

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Feb 8, 2013
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I dunno what to tell ya then. If you just traded the solid brown for solid green at the punchdown and again in the termination, following all other wiring correctly, it should work. I guess you could recheck the punchdown but if the tester reported all 6 lines working correctly....I'd be at a loss too.
 
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Tom Farrow

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Oct 13, 2013
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hmm, thanks for your help, much obliged,

Really confused here. I'll try switching out the green-white for brown-white in the morning. I've been working on site for 10 hours, that doesn't happen often :p

 
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mbarnes86

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Sep 16, 2010
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Hi

Are you running a phone + Ethernet connection on same cable?

I have use a splitter running 2 network connections on same cable but many years ago at 10Mb.
once a 100Mb switch was installed the connection stopped working

Simple cable testers are cheap but just test correct wiring connection at each end

More expensive equipment can test if it works at 100Mb full duplex or not
May you can hire or borrow a network tester

Also connect exactly as standard requires, all 8 wires , 4 pairs
Maximum cable length is 100meters / 110 yards between switch and device so 70 m should not be a problem
Is cable shielded & twisted pair ?

Regards
Mike Barnes
 
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