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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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