SOLVED Unintended side effects of 10GBase-T

Jamberry

Contributor
Joined
May 3, 2017
Messages
106
I wanted to post it here https://www.truenas.com/community/threads/10gbase-t-best-to-avoid-it-if-you-can.107606/page-3
put that thread is already closed.

Some time has passed and because I got a 10GBast-T client, I thought it was worth giving it a try again.
More and more devices are getting 2,5GBit LAN Ports. Even the cheapest consumer B650 boards have now 2,5GBit some like my device even have 10GBit.
So while I agree with @jgreco that in a better world, everybody would use SFP+ instead, in the real world Base-T is what we have now for home users. You may not like it, but that does not change reality.

As a Switch, I currently own a MikroTik CRS310-1G-5S-4S+. Not my dream switch, but the other ones were sold out. During the hot summer, I finally noticed that there is a fan inside that little device. The direct sunlight must have heated up that poor thing so the first time the fans turned on.
Even though the fan has PWM, the software only knows one operation mode: If temp of CPU is > 55° then fanspeed = 100%.
15000RPM of whiny 30mm fan noise.

Well, shortly after I moved it out of sunlight, added three 10GBit SFP+ DAC, and never heard the fan spinning again.

Now with my new device, the Mikrotik SFP+ module gets constantly beyond 65° (for GBase-T Mikrotik has a plus 10° threshold).
So the fan constantly spins up. Fortunately, I had an unused 80mm Noctua Fan with an Ultra Low Noise Adapter lying around. That fan is basically inaudible.

So yeah, 10GBase-T uses a lot more power!
 

Patrick M. Hausen

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Joined
Nov 25, 2013
Messages
7,776
I found these to be really nice. Whisper quiet, USB powered and not wandering off by vibration due to the rubber feet. Come with a L-M-H switch, but even high setting is barely audible.

I put one on top of my passively cooled Cisco 2960-L and one on top of my Protectli Vault.
 
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