Building a new tower

RouterOS General
1

I’d like some help brainstorming for new construction (and possibly some upgrades).

For backhaul connectivity, I’m thinking a RB435G with a single 802.11n radio and a dual-pol antenna. This could also have a 2nd radio/antenna for connecting to another site (alternate backhaul or a large downstream site). The only thing that gets me here, is how to provide POE and still be able to use the GigE interface. Can’t understand why MT didn’t design this sucker with 802.3af.

For distribution & client connectivity, I’m thinking 3 sectors @ 5.8Ghz and 3 sectors @ 2.4Ghz. I’d use 3 RB433AH routers with a pair of radios, one each for 2.4 and 5.8Ghz, everything running 802.11n.

At the bottom, I’m thinking a RB1100 (or one of the new units coming), a small UPS, and the smallest LP generator I can find (8kw?) with a 250 (500?) gallon tank.

Thoughts/comments? Thanks!

2

I have never tried to find a solution for Gigabit+POE on the same line.

Perhaps what you could do is run something like a 10ga dedicated DC power cable up the tower, put 24V on it, then distribute power to the power input jacks of your equipment with 14ga or 16ga wires at the top of the tower?

The biggest problem I can see that would need to be addressed is properly shielding the wires so that you don’t take EMI damage on the power ports - this would be VERY important, as such a long run of wire would easily pick up induced currents from nearby lightning strikes!

3

Hello, I’ve just come across this item at wisp-router:

http://store.wisp-router.com/catalog/partdetail.aspx?partno=POE-GB

It’s a MIkrotik branded Gigabit POE adapter for “Powering any RouterBOARD over Gigabit Ethernet”… “for use with any RouterBOARD that supports 9-48v PoE.”

4

Just a comment:
I may be wrong, but Gbit Ethernet does not have any spare wires left for power and Gbit capable POE must use data lines for power injection.

5

I would tend to agree. I was quoting the product description.

6

it doesn’t have spare pairs, but it goes over some of the data pairs:
http://www.routerboard.com/product/100

effectively this means power over datalines, but it’s not 802.3af compliant

7

That does bring me to the question - why not?
Why is the standard for those type of things systematically ignored by MT?
Any technical reasons?

8

48V is a lot more expensive to make. we better make affordable products with the same functionality.

9

I just tried the RB/GPOE on a RB/600. The board powers up and the switch port shows a gigabit link but I don’t get any data though the port.
Why?

How does this device work? Is there a diagram I can look at or some kind of documentation on it?

Are there units it works with and units it does not?

Do I need another device on the other side for it to work on some units?

This picture shows how I think it should work.
http://www.tyconpower.com/products/images/Typ_apps_POE-INJ-LED.png

10

it’s operation is simple. both the data and the power goes on the same wire.

make sure the “data+poe” end is connected to the RB, and DATA only is connected to the PC with a Gigabit ethernet card. RB600 needs 48V, make sure your power adapter supplies that.