The wireless physics discussion in another thread here applies as well. After 100 meters propogation delays can be an issue.  If it works, no problem, but be aware, I have seen things work for years and then it quits.

If you need the power calculations for your run, feel free to hit me offlist.

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


---------- Original Message -----------
From: "Mark Nash" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Mon, 24 Apr 2006 12:02:58 -0700
Subject: Re: [WISPA] 450' PoE 48v

> Thanks, Scott.  So, increased voltage is something to try.
>  
> And your comment on the cat5 being too far...it was considered initially but the ethernet interface on these units is a 10mb/half duplex interface.  My experience tells me that I can reliably do 10mb/half duplex ethernet with 500 feet of cat5...going back to my old Novell CNE days when 10BaseT was the next greatest thing, replacing Token Ring & Arcnet.
>
> Mark Nash
> Network Engineer
> UnwiredOnline.Net
> 350 Holly Street
> Junction City, OR 97448
> http://www.uwol.net
> 541-998-5555
> 541-998-5599 fax
>

> ----- Original Message -----
> From: Scott Reed
> To: WISPA General List
> Sent: Monday, April 24, 2006 11:54 AM
> Subject: Re: [WISPA] 450' PoE 48v
>
> First, 450' is way too far for really reliable ethternet, if it is cat 5.
>
> Voltage drops due to resistance in the wire.  Voltage = Current * Resistance.  Longer wire has more resistance.  You will need to increase the voltage of the power supply based on the current rating of the device(s) at the other end of the wire and the resistance of the wire you are using.
>
> Scott Reed
> Owner
> NewWays
> Wireless Networking
> Network Design, Installation and Administration
> www.nwwnet.net
>
> ---------- Original Message -----------
> From: "Mark Nash" <[EMAIL PROTECTED]>
> To: "WISPA General List" <wireless@wispa.org>
> Sent: Mon, 24 Apr 2006 11:25:08 -0700
> Subject: [WISPA] 450' PoE 48v
>
> > Hello...got a run of cat5 about 450' that is working but doesn't seem to be sufficiently powering the amplifier built into the antenna.  The device is a Terabeam EtherAnt-Turbo/LR (same as Proxim's Terastar EtherAnt/LR).  It works but SNR should be better.  If I power the thing locally (25' of cat5) it works as it should, so I think it may be insufficient power. 
> >  
> > It's got a 48v 0.4a power supply.  I know that it's far over spec for PoE...but specs were made up from engineers who have to play it safe for what they recommend.  So...any field answers to my dilemma?  Is more information needed?
> >  
> > Perhaps a side question:  What drops over distance...volts or amps?  Please consider the non-electrically-experienced crowd.
> >  
> > Thanks much.
> >
> > Mark Nash
> > Network Engineer
> > UnwiredOnline.Net
> > 350 Holly Street
> > Junction City, OR 97448
> > http://www.uwol.net
> > 541-998-5555
> > 541-998-5599 fax
> ------- End of Original Message -------
>

>

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