Are mikrotik devices compatible with the 24v “positive ground system”, or is there a risk of a short circuit?
Following Mikrotik-Devices have optional -48V DC telecom Options.
CCR2004-1G-12S+2XS
CRS326-24S+2Q+RM
CCR1072
RB1100AHx4 has -48V support as well.
Sorry to revive old thread, but I was looking for LAN switch that can operate in “positive ground” environment.
We have a couple of devices designed to operate in “positive ground” environment. ( - power terminal is isolated from chassis and ground) and we need to wire their LAN ports for remote management.
I’ve looked at RB1100AHx4 datasheet and there is indeed option to power it with DC voltage.
I need a little bit more info about the following statement from datasheet: 20 V - 57 V (-48 V supported).
I don’t have RB at hand to measure if (-) terminal is isolated from chassis and ground or not.
Can someone please confirm that RB1100AHx4 can be powered via (-48 VDC positive ground) and that its chassis can be safely / properly grounded together with existing equipment?
Thanks in advance!
If it says on the site, and there’s clearly a separate connector, it’s true.
I don’t think they would have left it written for years if it was wrong…
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I think this image on the product page should assist in confirming the DC input is isolated -
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Thanks for the replies!
If I get a chance, I’ll take one unit for testing/measurements, and will report the results here.
I can confirm RB1100AHx4 works fine with -48V DC power. Better not mix that with PoE-in on ether13 though, CRS328-24P trying to power up (when already powered by -48V DC) reports a short circuit. The same DC/DC converter is probably used by both the DC terminal blocks and PoE-in. Two 230V AC inputs are also available and work as redundant with DC.
Thank you for the confirmation!
I wasn’t planning to use PoE-in.
I just need to power RB using existing DC PSU which has positive grounded, and the question was:
Is it safe to ground RB1100AHx4 chassis to existing grounding bar?