The network consists of 7 UBNT G3 IP cameras a netgear 16 Gigabit port switch and a Windows 7 NVR that is running Blue Iris (I ran UniFi Video and Xprotect Essential with same results, so it is not the software).

All cables are under 200 feet. 3 cables are over 150 feet, 1 is ~130 feet, 1 is ~100feet, 1 is ~75 feet and the last one is in the same office as the NVR so very short.

All cables were created from a spool (replaced camera side connectors twice) one connector was replaced at the switch side, will replace a few more at a later date.

Switch and router have been replaced by other brands with same results.

Each camera is running on the supplied POE injector that came with the camera.

All cameras are on static local IPs.

The issue: After startup the cameras will run for a random amount of time (from a few minutes to several hours) and will start to lose the connection (reseting the IP) this will happen 3 - 5 times and than they will all go down one by one (the camera is still on but no access to web GUI or SSH) after unplugging the LAN cable and leaving the POE cable plugged in the cameras will come back online and will show that they were never powered off, so they get enough power.

The only camera that hasn't exhibited this behavior is the one thats directly in the office on the shortest cable.

The logs for the affected cameras show that eth0 is down and then PHY up?

I am out of my depth here:(

Could a bad cable/connector cause all these issues?

  • 1
    Have you looked at the test results that your cable installer provided?
    – Ron Maupin
    Commented Jul 10, 2017 at 17:58
  • You made the cables yourself? Pairing and twisting are AOK? Any testing done?
    – Zac67
    Commented Jul 10, 2017 at 18:03
  • @Zac67 Yes the cables were made by me, I used this diagram "B" i.kinja-img.com/gawker-media/image/upload/s--jHmXhCpY--/… I just transferred some files over the cable to see if they work. I know i'm a noob in networking. Commented Jul 10, 2017 at 18:11
  • @RonMaupin I was the one creating the cables from a spool, and connectors, i created them at work as well and we move terabytes of data per week with no issues, so not sure what could be the cause here, not even sure how to properly test them. :( Commented Jul 10, 2017 at 18:12
  • 1
    That's not usually a good idea. Are the cameras using Gigabit or just 100 Mbit/s? Since the data flow is into the switch, have you looked at the port (error) counters on the switch?
    – Zac67
    Commented Jul 10, 2017 at 18:12

1 Answer 1


This appears to be a cabling problem. You should consult an experienced, certified installer to see if your cabling can be fixed. Get the proper reports and put them on file for later reference.


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