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Forum Discussion
cartossin
Sep 16, 2025Tutor
XS505m will not start with DAC cable inserted
When I have a DAC cable linking my XS505m with my ubiquiti switch, it does not boot. All the lights go solid and it doesn't do anything. The workaround is you unplug the cable, start the switch, then...
- Sep 17, 2025
Very likely. A good starting point is always the switch datasheet with the supported modules and model types listed:
Source: https://www.netgear.com/jp/media/XS505M_XS508M_DS_tcm171-59932.pdf
FURRYe38
Sep 16, 2025Guru - Experienced User
Are you needing a SFP to Ethernet or SFP to Fiber adapter or actual SFP to SPF DAC cable?
Does the switch with with out the DAC connected?
Is the DAC cable connected to something else or just only inserted in to the XS switch?
What is the other device that the DAC would be connected too?
I'll take a look what what I put in my XS505m, I believe it's a 10Gtek SFP to Ethernet 10Gb adapter the one I got from here:
https://www.amazon.com/dp/B01KFBFL16
Switch has been working great since day one for me.
But I had also got a Cable Matters and one other. I can't remember which on is currently installed since I got it a few years ago. So I'll take a look.
Just wondering if you power OFF the switch, remove the SFP device, power ON the switch and let it come to ready, then insert the SFP device in the port, does the switch work or something happen?
cartossin
Sep 18, 2025Tutor
My switch is linked to a ubiquiti pro max 16 via a 10gtek passive dac cable. The switch boots fine if I unplug the cable, wait for it to power on, then plug it back in. I noticed the problem recovering from a long power failure.
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