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Om1P Passive PoE run vs af PoE Run

 
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riaz
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PostPosted: Sat Jan 29, 2011 9:57 pm    Post subject: Om1P Passive PoE run vs af PoE Run Reply with quote

1) So I just realized in one of my networks I am using the normal 12v Passive PoE injector for the Om1P, and running it 150 feet. I believe the limit is 100feet for Passive PoE right? (passivepoe.com). I have been having signal issues here, and wonder if i might be emitting a lower TX power out of the OM1P because of this.


2) In an upcoming install I am planning on using PoE 802.3af Switches with the Om1P's, using these PoE adapters: (ubnt.com/8023af)
Anyone had any experience with these adapters w/ Om1P? I should be able to go 300 feet with the 802.3af run, then just plug this adapter in right before the om1p?
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codyc1515
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PostPosted: Sun Jan 30, 2011 10:40 pm    Post subject: Reply with quote

1. I would think the device wouldn't work at all, not just limit the TX power.
2. Be careful with that, its 48v and the OM1P is 12v. You will need to run it some distance to get a big enough loss for it work with that, without frying your device.

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riaz
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PostPosted: Mon Jan 31, 2011 10:08 pm    Post subject: Reply with quote

Hey Cody thanks for the relpy.

1) Yah.. i would imagine so too. They are definitely up and running..
The om1p PoE injectors that come with it are 12v, and it looks like the operating v for om1p is 6-18v. So maybe because its a longer run the voltage has dropped below 12v.. but the om1p can still handle it?
(I haven't really seen the devices go down.. but i wanted to make sure it wasn't effecting TX power or anything..)


2) The "Instant 802.3af" device by UBNT seems to say it will transform any device into 802.3af compatible. I looked at the specs, I believe what it does is takes in 802.3af (at 48v), then convert it to 16v Passive PoE and give it to the device (om1p in my case) And since the om1p is capable of 6-18v im guessing i should be good? =)
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Adrian
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PostPosted: Mon Jan 31, 2011 10:17 pm    Post subject: Reply with quote

I've run my OM1P down to 5V without any problems. Below that it goes unfunctional. Didn't notice any performance issues before it stopped working.

Haven't tried to see if it would gracefully return to operation if the voltage increased above the 5V threshold.
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reverged
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PostPosted: Sat Feb 12, 2011 6:26 am    Post subject: Reply with quote

riaz wrote:

2) The "Instant 802.3af" device by UBNT seems to say it will transform any device into 802.3af compatible. I looked at the specs, I believe what it does is takes in 802.3af (at 48v), then convert it to 16v Passive PoE and give it to the device (om1p in my case) And since the om1p is capable of 6-18v im guessing i should be good? =)


I just installed a bunch of the Instant 802.3af devices with OM1P's. They seem to be doing OK, although 1 failed out of the box and roc-noc was not too keen on them. I had previously used the Panoptic device from Streakwave and had no issue. The Panoptic comes in a 12V version. The indoor UBNT puts out 18V, which is at the top of the OM1P spec.
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harry_the_face
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PostPosted: Mon Feb 14, 2011 7:48 pm    Post subject: Reply with quote

riaz,

I would check you Country code for Tx power issues. I have to reset it with every new flash.
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riaz
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PostPosted: Tue Feb 15, 2011 11:34 pm    Post subject: Reply with quote

Hey Reverged,

thanks for the help. Yah I noticed on the UBNT website on the 'instant 802.3af datasheet it says its 16v output, but then the box says 18v. The rep told me its 18v output.

Do you think its dangerous powering the Om1p at the very top of its range? I have one working fine at home, and it sounds like you have quite a few working fine as well.

I like the panoptic device you referred me to, looks perfect. For some reason I feel more comfortable in terms of reliability with the UBNT device than the Panoptic....

But maybe I should use the Panoptic device if its not too smart to be powering the OM1P at the top of its voltage spectrum.
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reverged
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PostPosted: Fri Feb 25, 2011 8:49 am    Post subject: Reply with quote

Sorry for the delayed repsonse - I don't get email notifications of replies anymore.

I have a bunch of both types that have been running for a while and no problems.

I agree, I tend not to run things at the ends of the spec, but then again, if the engineer did his job.......
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