|
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.net541-998-5555 541-998-5599
fax
----- Original Message -----
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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