Grounding rack with mikrotik's

Hardware MikroTik hardware general
1

Hello there,

I just bought my new mikrotik setup for providing wifi to a hotel.
I have 3 sxt for outdoor and 8 951U for inside each apartment.
On the control room i have a rack with an RB2011, a cloud switch CRS125-24G and a gigabit POE panel ( http://linkshop.gr/shop/wi-fi/poe/passive-poe-patchpanel/gigabit-poe-rack-mount-and-shielded-12-port-oem.html )
All these are powered by an APC back-ups 1200 VA.

I want to use proper grounding for my system, because we have a lot of problems with the electricity and lightnings.

My first question is if i have to use 2 separate ground rods, one for the outdoor sxt’s and one for supplying the rack.

My second question is if i need to put the ground wire only on the rack, or should i put a second cable on the POE panel?

And last, should i use lightnings arrestors and where? Or is the POE panel providing enough security against lightnings?

Thank you so much.

2

Think about it, you’re grounding, everything ends up connected to the same place: ground.

SXTs do have metallic RJ45 sockets, if you use proper RJ45 connectors with outside metal contacts that’s all you’ll need for them as long as you use those same RJ45 plugs on the POE panel side, providing it also uses shielded RJ sockets.

You should ground the Rack, I’d ground the POE panel directly as sometimes paint, aluminum, etc doesn’t make good contact (low resistance) and you want the least resistance path to ground to be through your grounding…

POE panel should provide protection upon power surges, dunno if that would help with lightings damaging the network core components.

3

Connect all grounding rods together well to minimise the possible voltage differential.

4

Dear friends, thanks for your answers!

My POE panel has shielded RJ45 sockets, so i will use metal RJ45 connectors to SXT’s and to the POE panel. I think i dont need to do that also for the internal 951U, or is it necessary for static electrism inside the house etc?

Also i will use a cable from the ground that will be divided in 2 cables, one for the rack and one for the POE panel (and i will tie those cables well as jarda proposed). Is that right?

And my main question remains, if after all these i need to use lighting arrestors and an extra ground rod for the outdoor SXTs.

Thanks so much for the support!

5

Any help please?

6

take note of shielded rj 45 connectors need shielded cable with a wire to connect to connectors like ubiquiti tough cable connectors

7

You should only have one ground point. If you have multiple ground rods they need to be tied together and only fed from one conductor. Shielded cable needs to be terminated into shielded patch panels or jacks. The shield only protects from EMI. Surge protectors protect equipment from voltage spikes. There are many protectors that work with POE and GigE.


Panduit and others have good grounding reference guides.
http://www.panduit.com/ccurl/88/656/Reference%20Architecture%20Design%20Guide%20Part%203,0.pdf

Surge protectors
http://www.l-com.com/content/Data_Line_Protector_Comparison.html

8

Have a look at Manual:Grounding

9

Dear jKarras,

I just read the guide of Panduit. It is really awesome work!
My conclusions are these, please tell me your opinion:

I will make one ground rod near the rack.
The ground rod will be connected to the rack and to all my equipment separately(one cable for the poe panel, one cable for the RB2011 etc).
All my indoor and outdoor cables will use shielded RJ45.

My only question now is if my poe panel is protecting from lightnings or not? It is the http://linkshop.gr/shop/wi-fi/poe/passive-poe-patchpanel/gigabit-poe-rack-mount-and-shielded-12-port-oem.html

Thanks so much for the support!

10

No it does not.