CBS250-16P-2G transformer noise

[brendan]

I just deployed a CBS250-16P-2G in an office environment and the (what I am pretty sure is) transformer noise is pretty bad. Its a continuous high pitched buzz and the users near it are being driven crazy. I am probably going to seek replacement, but I wanted to see what others have experienced with this switch. Do you think I'll have luck with a replacement unit or is this characteristic of the model?

FYI, the PoE workload is minimal.  Total consumption is 10 watts across 3 PoE ports.  

[marce1000]

                                         (replacement is probably advisable)

 Ref : https://www.cisco.com/c/en/us/products/collateral/switches/business-250-series-smart-switches/nb-06-bus250-smart-switch-ds-cte-en.html

 >...

Acoustic noise and Mean Time Between Failures (MTBF)	Model name	Fan (number)				Acoustic noise				MTBF at 25°C (hours)
	CBS250-8T-D	Fanless				N/A				3,277,956
	CBS250-8PP-D	Fanless				N/A				1,659,542
	CBS250-8T-E-2G	Fanless				N/A				2,171,669
	CBS250-8PP-E-2G	Fanless				N/A				1,706,649
	CBS250-8P-E-2G	Fanless				N/A				1,706,649
	CBS250-8FP-E-2G	Fanless				N/A				1,706,649
	CBS250-16T-2G	Fanless				N/A				2,165,105
	CBS250-16P-2G	Fanless				N/A				706,983

[nicktc]

I just bought this switch and have the same thing. Did you return it?

[jimstewart77]

Pretty poor if this is the same for all of them.  Hoping we will get some people pop up and say they dont have issues.  I have an 8P which is completly silent (and I am generally sensitive to switchihg PSU noise).  I have considered if one day I will need to swap to a 16.  .

[FL Native]

I'm not a Cisco GuRu but have been in electronics when DOS 3.1 came out. The problem is the transformer or the whole unit was dropped or jarred. Under Warranty? replace it. Otherwise, pop the cover un-mount the transformer and use a what they call an acid brush and dribble varnish in the tight spots between the copper coils and the metal housing. If you don't do either of these two options the transformer vibration will eventually  wear off the wires and it will short out.