View Full Version : RouterStations for PTP link
jknapp
03-11-2009, 02:46 PM
I'm looking at some options for replacing some teletronics radios that I'm using in a point to point link. Unfortunately, one end of the link has a requirement for 802.3af 48V POE. There is no option to change this. The only Ubiquiti product I'm aware of that supports 802.3af POE is the RouterStation Pro.
So, my question is has anyone used 2 RouterStations in a point to point scenario before?
An additional question that would be purely bonus if possible, are there any options are there for setting up 3 PTP links between the 2 RouterStations and combining the throughput since they can handle 3 cards?
What device requires 48 volts if you are going to replace it with the UBNT?
jknapp
03-11-2009, 03:35 PM
Its not that the device requires 48V its that the only power available is 48V.
What I'm doing is a point to point link from a tower, to a street light that has a Cisco 1522 Mesh AP mounted on it. The Cisco 1522 has a POE "out" port that I am using to power that end of the PTP link. The Cisco Mesh AP then gets its link back to the network across the PTP link and can function as a Root Access Point for a Mesh.
I'm already doing this successfully with two Teletronics TT5800s. But the problem is the TT5800s have loads of issues, one of which is randomly rebooting. I'd like to replace them with a more reliable option, and have had great success with UBNT products that we are using in other applications.
Ok, so you are saying the ONLY power you can get is that 48 volts. No way of tapping in where the Cisco gets its 120 VAC power and use a UBNT 12 volt PS and injector?
jknapp
03-11-2009, 05:05 PM
The Cisco is drawing its power via an adapter that hooks onto the photo cell of the street light. I believe the output volotage at the photo cell is 220V or something like that. The Cisco radio being designed to mount on street lights and various other high power poles has the capability to convert that down to what it needs.
There are ways to tap into the photo cell directly, but they aren't cheap and add quite a bit of bulk to the top of the street light.
See if this will work. You might have to call Linksys for more details.
http://www.linksysbycisco.com/US/en/products/WAPPOE12
I'm not sure if you can input 48 volts and still let it output 12 volts.
jknapp
03-12-2009, 11:05 AM
I've looked into these in the past.
Even if it would work, that unit is not rugged enough to be hung outdoors. Even in an enclosure, our temperatures regularly get below freezing which is below indicated operating temperatures for that device.
Not worth the risk for a mesh that's got a lot of customers depending on it.
