Colorado Springs, CO
[H/W] 3750 POE Model Line Noise
Has anyone seen a 3750 create so much line noise you can not tone out the ethernet cables more than a few inches. We hear a loud AC hum that goes away when the switch is unplugged, however after an RMA we still have the issue.
I've tried setting inline power to never and we still have the noise.
What type of toner/probe are you using?
When tracing ethernet connections, a normal induction type of toner/probe setup like the Triplett (pick one) normally doesn't travel far along the line and if it does, it's VERY faint and in a data center area is very difficult to hear.
The Fluke IntelliTone Pro 100/200 (»www.amazon.com/Fluke-Networks-MT···001FSCVI) uses a digital signal that better traverses the cable with the ethernet active.
The IntelliTone 200 works by employing a smart, synchronized digital signal that searches for several tone types in the signal. It can detect maximum radiation within a bundle, it can search for a signal with minimum radiation, or it can seek an automated signal that steps through each conductor. The device is also designed to ignore the noise produced by fluorescent lights, machinery, computer monitors, and electrical wiring, so you can quickly isolate the proper signal and save hours on cable location projects. And unlike analog signals, the IntelliTone digital signal stays strong despite the use of "common mode termination" among modern network devices. "Common mode determination" is designed to reduce noise and crosstalk in the cable, but can absorb an analog toner signal. No such problem with the IntelliTone's digital signal.
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