ssprenge
Premium
join:2006-10-09
Chaska, MN
2 edits |  How does the POE work?
Here's a dumb question, from me.
I am assuming that once I install a cpe, such as a tranzeo outside on the roof or something, all I have to do is plug the cat 5 cable from the cpe radio into the ethernet jack in the computer. And that's it. How does the POE work in that scenario? Does the computer provide the power to the cpe radio?
These client PC's do not need anything else but their NIC card to receive internet service, right?
And if the customer wants to distribute a wireless signal using a wireless router such as a Linksys, all I have to do run the cat 5 cable into the Linksys, and configure their laptop or a wireless capable desktop.
Am I missing something here?
THX,
ssprenge
[mod note - moved to its own thread & corrected the topic heading} |
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robbin
Premium,MVM
join:2000-09-21
Leander, TX | Re: Dumb Customer Trouble Calls Revisited
That question deserves a thread of it's own! |
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electric6
@dslextreme.com
| reply to ssprenge
said by ssprenge  :Here's a dumb question, from me. I am assuming that once I install a cpe, such as a tranzeo outside on the roof or something, all I have to do is plug the cat 5 cable from the cpe radio into the ethernet jack in the computer. And that's it. How does the POE work in that scenario? Does the computer provide the power to the cpe radio? Unless the computer has a POE NIC, you need a power injector and a 48V wall cube. |
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ssprenge
Premium
join:2006-10-09
Chaska, MN | What are the chances of that, a customer's computer having a POE NIC installed? And how can you tell? |
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| In case anyone is interested, check out this website, and feel free to add to it. Kory set this up for all of us to enjoy reading about all of our stupid tech support issues.
»www.funnytechstories.com/
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»www.wavecrazy.net Join WISPA today! »www.wispa.org/ |
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LLigetfa
join:2006-05-15
Fort Frances, ON | reply to electric6
said by electric6 :
Unless the computer has a POE NIC, you need a power injector and a 48V wall cube.
I think Tranzeo uses an 18 volt wall wart. |
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ssprenge
Premium
join:2006-10-09
Chaska, MN | What's a wall wart? |
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PetePuma
How many lumps do you want
Premium,MVM
join:2002-06-13
Arlington, VA
| said by ssprenge :What's a wall wart? Transformer. Adapter. Those square/rectangle things that plug in the wall and have a connector on the other end. |
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bryandj23
join:2002-08-15
Bay City, MI | reply to ssprenge
Re: How does the POE work?
 |
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PetePuma
How many lumps do you want
Premium,MVM
join:2002-06-13
Arlington, VA
| You need devices at both ends that support POE. One end provides a power source, the other end consumes that power.
How that power gets on the wires depends on the power source hardware. Some POE switches include POE voltage, or you can buy an injector that you connect a Cat5 cable (and a transformer) to, and then run another Cat5 cable out the other side.
Similarly, a consuming device must be built with POE in mind -- you can't just run any old device with an ethernet port using POE power. |
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LLigetfa
join:2006-05-15
Fort Frances, ON | Not all POE are created equal. You need to match the injector with the power consuming device as there are not only different voltages involved but also different copper pairs. I believe that for a Tranzeo radio, you would use their POE injector. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
| reply to ssprenge
said by ssprenge :all I have to do is plug the cat 5 cable from the cpe radio into the ethernet jack in the computer. And that's it. How does the POE work in that scenario? Does the computer provide the power to the cpe radio? This is almost never true.
The PoE CAT5 will go first to an indoor PoE device which has a separate non-PoE port (usually marked "DATA") to connect separate CAT5 to PC or router.
It is very important to understand and follow the vendor's directions. PoE voltage levels for various CPE models can be can be 48V or 24V or 18V or 15V or 12V.
said by ssprenge :These client PC's do not need anything else but their NIC card to receive internet service, right? Occasionally you will have to use cross-over cable if the NIC does not implement auto-MDIX. You will know by link lights not blinking.
said by ssprenge :And if the customer wants to distribute a wireless signal using a wireless router such as a Linksys, all I have to do run the cat 5 cable into the Linksys, and configure their laptop or a wireless capable desktop. For this privilege, you just have to connect WAN port of indoor wireless router to DATA port of PoE device.
The router's WAN setting could be static IP or PPPoE or even dynamic IP based on how setup your WISP. |
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korym
Go Wisp's
ExMod 1999-03
join:1999-12-23
Richmond, VA
clubs: | reply to ssprenge
Re: How does the POE work?
Oops, replied to the wrong thread. (Just noticed it was moved.)
My bad. 
Regards,
Kory |
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gpilot
join:2006-04-29
Napa, CA | Its a shame you cant get USB POE's
I think USB is 16V which could power a small radio, of topic i know but... |
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robbin
Premium,MVM
join:2000-09-21
Leander, TX
| USB is only 5 volts but the greater problem would be the low amperage. Here is a link to the specs. Even if there were enough power there I think it would be an extremely bad idea. Using the customer computer to power a WISP radio would be just one more thing to blame the WISP for if they had any kind of computer problem. |
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AMD Phreak
Premium
join:2003-12-14 | Actually I found some YDI USB Etherant CPE's in our inventory after an aquisition. I'd have to check how it works, but it is a USB cable that runs inside. Never took the time to look....the cables are like 15 feet or something obnoxious like that. |
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aeronet
join:2002-04-05
San Juan, PR | reply to ssprenge
circa 2001,
when i was testing wisp gear, I need a way to extend usb range on a Raylink (yuck) USB CPE's. I found a usb extenders that used cat5 for up to 100' but the price was $85.
those good old days..... |
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cmaenginsb
Premium,MVM
join:2001-03-19
Palmdale, CA | reply to ssprenge
Phreak, that isn't a true etherant. YDI made a CPE similiar to the Etherant that used a USB wireless radio.
--
CCNA, Comtrain Certified Tower Climber |
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lutful
Premium
join:2005-06-16
Ottawa, ON
| reply to gpilot
said by gpilot :I think USB is 16V which could power a small radio, of topic i know but... USB can "officially" supply only 500mA continuously at 5V (2.5W) to a device at maximum 15ft distance.
You can use any of 1000+ USB WiFi devices as a "window mounted" CPE.
A few companies also sell "extended USB" CPEs that do 80ft.
They generally cost in the $50 to $75 range. I think it is best to connect them via a powered HUB to avoid motherboard damage.
See one example above from Superpass. |
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