Genius tier: 1.) Buy CAT6 patch cables 2.) All desktops connect through 100mbit phones with ethernet hubs
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I’m really honestly so happy and smiling that today I got to help teach so many people that, yes, sometimes it’s REALLY the network cable. I wish I heard that years ago. I ripped my hair out reimaging PCs and trying different NIC drivers trying to solve phantom problems.
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There is so much compensation for physical layer issues higher up in the OSI chain that the OS is really good at compensating for and hiding physical issues from you. Until it doesn’t and stuff starts breaking and Wireshark can’t tell you why.
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Show this threadThanks. Twitter will use this to make your timeline better. UndoUndo
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I had a buddy who kept a patch cable on his desk. When I asked him why it was there and why he never used it he pulled out a cable tester and showed that it tested cleanly. He then plugged it in between his computer and the wall and his computer lost connectivity. "That's why"
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He said he kept it to remind him that sometimes, despite all the evidence that something SHOULD work, that it didn't. Eventually he got it framed ;-)
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I once had to remote troubleshoot a whole office going down. Short story: don't let someone place a 12' magnet in the warehouse up against a shared wall with the telecom room...
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Now I want to know what they needed the 12' magnet for...
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Oh wow this brings back memory. We found so many bad cables while supporting on-prem VoIP. Laptops would compensate just fine, but the phones would refuse to TFTP boot.
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Cisco 4500 configured as secondary, also acting as a voip aggrn node. Suddenly users on floor report that phones are working intermittently. Module is flapping, power is okay, nothing obvious. When all else failed, noticed a different cable connecting voip node, not a TE one. (1)
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Gravity. When you replace the cable, problems are solved. Why ? Many people forget that cables stretch because of simple gravity. This can result in deformation of copper core & partial detachment from metal guides in the RJ45 connector causing degraded frequency performance.
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Cat6 cables are quite fragile because of their higher frequency requirements to support the additional speeds.
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It has been a long long time since I did a CCNA training course but even way back there I was taught to troubleshoot Layer 1 first. Of course it’s hard if it looks like it’s working but if you’re pulling your hair out, going back to basics at Layer 1 has to be the start.
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I used to subscribe to the same view. Having spent ages debugging a remote SIP RTP issue the other day I've found that layer 8 and layer 1 sometimes overlap quite badly..... Site inspection revealed the handset was connected to the headset port on a phone.....
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