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Netgear GS748Tv6 port issues
Hello all!
My company installed a brand new Netgear GS748Tv6 (version 7.0.0.14) switch on Sunday and had some issues with a sluggish infrastructure since then. After so many test, we found a smoking gun with the built-in cable testing feature.
The cable test shows the length for our port 3 of 0m - 178m, when the cable plugged into the port is only about 2FT long. All other ports show normal lengths. I switched out the cable to test, and the test still shows a long cable length. I mimicked the settings on this port over to an unused one, and now everything is working perfect. The cable test even shows normal results.
Obviously, it sounds like a bad port on this brand-new switch, but I can't find any errors about the port 3 at all. We have some Linux servers connected to this switch, so doing the cable test messes with them. Has anyone experienced these issues or had luck in finding an actual red flag besides the cable testing?
Thank you!
3 Replies
These built-in cable test feature results depend on many different factors - on the effective used cable, cable length, on the installation, on the connected device, on shielding, on grounding, .... This "feature" - regardless of the brand model of the switch - does not, Not, NOT replace a high quality cable measurement tool. Needless to say, these measurement tools always come with a tester -and- a plug for the other end to return some meaningful -measurements-.
Built-in Cable Tester | NETGEAR Communities
https://www.netgear.com/hub/business/av/poe-cable-length-standards/
https://kb.netgear.com/29789/How-to-use-the-Cable-Tester-feature-on-NETGEAR-ProSAFE-Click-Switches
Important note:
The cable diagnostic utility in the device might yield different results. It can be due to a variety of factors, from link speed (10/100/1000) or cable types (Cat5, 5e, 6, 7, STP, UTP, etc). This is generally due to the electric signal changes based on those factors. Since the switch is a gigabit switch, it is recommended to use CAT5e STP cable, or better, and a gigabit link partner.
Obviously, it sounds like a bad port on this brand-new switch,
Extreme unlikely.
We have some Linux servers connected to this switch, so doing the cable test messes with them.
Let me guess: Affected are (hard to imagine it should be a Linux thing...) faster MultiGig, 10G, or faster Ethernet ports, PoE-powered adapters, ... Provide more details, like make, model, version of the Ethernet adapter, please.
Thanks for the response. It turned out to be a bad port on the switch. The only thing that led us to this was the cable test.
Ok, so very bad luck.
Have managed to raise a support ticket, and you will get a replacement?
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