Additionally consider, just because something works on the ground doesn;t mean that it will work up in the air, for two reasons.
 
1) When operating outside of specs, it may take a period of time before the equipment starts to fail and flaws show up.
    (heat build up, or stress on devices)
 
2) Interferences stretched along the tower structure for 250 feet, may be different than interferences that exist in a coil at the ground.
 
Take note, that even though COILS can degrade signal, I've tested 500 feet cables on the ground in coils with Trango successfully, but up on a roof, failures at 200 feet in some circumstances.  
 
So...
 
first, do the math.
second, test on ground. 
third, prey that it will works after its been installed on the tower. :-)
 
The most important lesson, is to rule out unknowns before you install on the tower.
Test IP configurations of radios from laptop. Use patch cables that will be used when testing live. Work with a set of knowns.
So you don't have to Climb just to rule something out. And always test before you climb down. 
 
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
 
 
----- Original Message -----
From: Scott Reed
Sent: Friday, September 15, 2006 12:48 PM
Subject: Re: [WISPA] MT power supplies THE SOLUTION

I just looked at that Resources for a 532.  2 Ports are VIA Technologies.  The 3rd is Integrated Device Technologies.

Scott Reed
Owner
NewWays
Wireless Networking
Network Design, Installation and Administration
www.nwwnet.net


---------- Original Message -----------
From: Brian Rohrbacher <[EMAIL PROTECTED]>
To: WISPA General List <wireless@wispa.org>
Sent: Fri, 15 Sep 2006 09:20:58 -0400
Subject: Re: [WISPA] MT power supplies THE SOLUTION

> I started with....       RB 532 on tower.  It comes down 265 feet to poe
> injector to router.  Major packet loss.
> 2)  switched RB 532 out.  No change.
> 3)  Created test setup on ground with "bad board" and it looked fine.
> (from laptop--6ft cable----poe----265 ft---RB)
> 4) Blamed it on the cable, and got a cable certifier from a friend.
> 5)  Right before climb, I re did the test setup on the ground.  This
> time I plugged the 265 feet into the actual router instead of my
> laptop.  The problen was back.  (I was bummed)
> 6)  One final test.  Get another 265 foot cable.  I used 265ft for power
> and 265ft for data to eth 2 or 3.
> Problem solved.
> I can only speculate that the chipset on RB 532 poe port is diffrent
> from the chipset on eth 2/3.
> And for whatever reason it was not compatable with cable, hardware,
> ect.....setup.
> I may never know for sure why, but I have the workaround.  Good enough
> for me.
>
> FWIW  I ended up pulling 2 new cables (all 3 certified fine).  I used
> the original cable for data (it has "real" shield)  I used my new 2
> (cheapo foil shield) for power and slapped the other into eth3 for the
> heck of it.
>
> Lessons learned for next time.
> Measure cable, crimp, and power up on ground using the EXACT same
> everything as what the final deployment will have.  And then test.
>
> Hope that sums it all up.
>
> Ok to directly answer your question.  Yes.  I did this on the ground
> test unit.
>
> Brian
> Rohrbacher
>
> Paul Hendry wrote:
>
> >Brian,
> >
> >Just out of interest, did you try running both power and data over the new
> >cable and did you still see the same issue?
> >
> >P.
> >
> >-----Original Message-----
> >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> >Behalf Of Brian Rohrbacher
> >Sent: 15 September 2006 02:43
> >To: WISPA General List
> >Subject: Re: [WISPA] MT power supplies THE SOLUTION
> >
> >First off.  I'm back to a 48v 420mA power supply.
> >To the solution.
> >I ran another cat5 up the tower and plugged it into the RB 532.
> >Now I have one cable for poe and one cable for data, and it all works fine.
> >And check this.  My headache went away as soon as the problem did.   :)
> >Problem solved.  NEXT!
> >
> >Brian
> >
> >Tom DeReggi wrote:
> >
> >  
> >
> >>Amps don't mean a thing without disclosing Volts, Consider Watts
> >>instead. 1300mA at 3V is much different than 1300mA at 18V.
> >>The mPCI slot (SR5) is 3.3V.   Power to the Motherboard is from
> >>12-48V. W=V*A
> >>
> >>Tom DeReggi
> >>RapidDSL & Wireless, Inc
> >>IntAirNet- Fixed Wireless Broadband
> >>
> >>
> >>----- Original Message ----- From: "Mark McElvy" <[EMAIL PROTECTED]>
> >>To: "WISPA General List" <wireless@wispa.org>
> >>Sent: Wednesday, September 13, 2006 8:19 AM
> >>Subject: RE: [WISPA] MT power supplies
> >>
> >>
> >>I am surprised no one has mentioned this. I looked up power consumption
> >>on the SR5 and it shows 800 to 1300 mA each. You state your power supply
> >>is 700mA. I did not look up power consumption for the RB532 but I would
> >>think you would need at least a 3A supply.
> >>
> >>-----Original Message-----
> >>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
> >>Behalf Of Brian Rohrbacher
> >>Sent: Tuesday, September 12, 2006 11:51 AM
> >>To: WISPA General List
> >>Subject: Re: [WISPA] MT power supplies
> >>
> >>So, does anyone know if it looks like I would be fine on the power side
> >>of things?
> >>I have tweaked the ethernet port settings for no gain.
> >>
> >>Next step is to get climbing 280ft to replace board, but I'd like to
> >>confirm power first.
> >>
> >>Brian
> >>
> >>Brian Rohrbacher wrote:
> >>
> >>    
> >>
> >>>I have a RB 532 on 300 foot of cat 5 with 2 sr5.
> >>>I'm using poe 48v .700a power supply.
> >>>I'm seeing weirdness.
> >>>
> >>>Do I have enough "juice"
> >>>
> >>>Brian
> >>>      
> >>>
> >>    
> >>
> --
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>
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