POE Passthru

[Brother D]

Hi All,


Looking for recommendations for the following...

I have couple of buildings/structures that I want to daisychain, but mid and far end don't have permanent power...

Just want to see if recommendation on switches to do the following:


OFFICE
|
Barn1 (with power) - POE switch, AP & 1x IP cam
|
Barn2 (no power) - POE Passthru switch AP & 3x IP Cam
|
Barn 3 (No power) - 1x IP Cam


So I want Barn 1 switch to supply enough power to run another switch, AP and 3 Cams in Barn2, and then for Barn2 POE Pass thru to supply POE to Barn3 which is 50m away...

Any recommendations of switches would be appreciated.

Edited by Brother D on Monday 11th September 16:28

[somouk]

That volume of POE passthru I don't think will work.

POE 802.3at pushes about 30w down the line, the first POE switch will use some of that and the second one will likely finish it off if the first one can pass on enough.

The cameras etc at the end of the line wouldn't get enough power most likely.

There are some newer POE standards out such as 802.3bt Type 3 and 4 with higher power ratings that you could look at but i'm not overly familiar with the capabilities of switches on those power ratings.

Depending on distances you could potentially just run some CAT6 from Barn 1 to Barn 2 with POE on it from an injector and then another cable from Barn 1 to Barn 3 on its own cable as well to avoid the daisy chain effect.

[theboss]

Yeah there's no way you'll get all that down a single wire.

Either put a bundle of Cat6's in place so you can have a bunch of POE switch ports from the Barn with power to the various devices individually, or you'd have to look at running a power cable to the others.

[Harpoon]

What are the power draw requirements of the cameras and APs?

Do you have devices in the middle barn? If not, can you not skip having a device there (which would save a little bit of the power budget from the main switch) and just go straight to the third barn?

[Brother D]

Thanks all - looks like the dahua are 5W with the IR on at night so with the APs etc not going to have the power budget on single wire.

I'll run two wires as suggested - still open to recommendations on the POE passthru switch

[duff-man]

As far as I know none of the top brands do pass-through poe to multiple ports

Netgear do one but only pass-through to two ports:
https://www.netgear.com/uk/business/wired/switches...

Other option is an Amazon special, which for the price is probably worth a try and easily returned if they dont work:
https://www.amazon.co.uk/dp/B09LQYYDBS

[random_username]

https://www.netxl.com/poe-network-switches/ubiquit...

Should do POE to multiple ports if the input is beefy enough... You can also get a proper outdoor enclosure for it which may be useful if it's in the elements...

[megaphone]

Have a look at Ubiquiti Unifi Flex switches. They also do AP's and cameras. https://eu.store.ui.com/eu/en/pro/category/all-swi...

[Magnum 475]

megaphone said:

Have a look at Ubiquiti Unifi Flex switches. They also do AP's and cameras. https://eu.store.ui.com/eu/en/pro/category/all-swi...

This. Ubiquiti / Unifi have one of the best ranges going for this type of application. They can be a little tricky in terms of the first setup, but when they're up and running they're great.


But you may still need to cable:

Barn 1- Barn 2 as one cable run

Barn 1 - Barn 3 as a second cable run (which could pass directly through barn 2 without interacting).

I'd probably do two separate cable runs anyway, just for the extra capacity for the future.

[Mr Pointy]

What are the other distances involved - you've only told us one run is 50m. Don't forget there is a link length limit of 100m & if you have long runs of PoE you should consider CAT6A or CAT7 cable as the copper cores are thicker & there will be less resistive loss.

[Magnum 475]

Is there anything stopping you from running a 240V spur out to at least one of the barns at the same time that you install the cable runs? That would give you power in that location and be a more reliable solution. Just a simple extra breaker on your mains consumer unit, and power out to a barn. (This is what I did to power my outbuildings)

[biggiles]

Similar problems here in the past - in the end it was much easier to run a power cable at the same time.

If you put it in a conduit, you will have plenty of options. I have run power+network cable in the same conduit for fairly long distances without any issues.

[theboss]

biggiles said:

Similar problems here in the past - in the end it was much easier to run a power cable at the same time.

If you put it in a conduit, you will have plenty of options. I have run power+network cable in the same conduit for fairly long distances without any issues.

Indeed. Then you can stick fibre in place of copper safe in the knowledge that a lightning strike to barn 3 isn't going to kill every device on your network.