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 Subject :Re:Homebrew Power over Ethernet.. 2013-06-12- 12:18:55 
KD5MFW
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Joined: 2010-01-18- 23:02:11
Posts: 104
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Over several models of the WRT54G, Linksys changed right and left antenna ports for no good reason. We made a good faith effort to test all models for left and right and have the firmware try to make left and right the same for all models. Is there any proof the router actually puts out proper RF on any connector? The radio might be damaged and not be putting out useable RF on either antenna connector. If so, trying to change ports would do no good. I suggest using diversity and let the radio see if the radio works properly. (links to another mesh node). If that works, you can try to find where the working RF is coming out of the box. Hope this helps. -Glenn, KD5MFW
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 Subject :Re:Re:Homebrew Power over Ethernet.. 2013-06-12- 13:58:11 
wx5u
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Joined: 2013-01-02- 00:30:45
Posts: 188
Location: Austin, TX


I'm sure pointing the finger at Joe will be much appreciated after the damage is done, perhaps during an emergency, or when he damages the network switch at some public safety site where your local ham radio group is helping. 

Or when you apologize because you gave Joe the wrong router and though you had given him one of the ones you hadn't modified the power on.




[KJ4AJP 2013-06-11- 02:30:35]:

wx5u -> Plugging one of our bootleg ethernet powered connectors into a "standard" gigabit ethernet device, it might cause damage.
<snip>
wx5u -> If your buddy Joe is working on your HSMM repeater site and decides to plug his laptop into your "ethernet" cable, you might damage something.

No, Joe might damage something.  Your FCC license gives you the leeway to experiment with your equipment, and if you're going to modify anything it stops being "plug and play".  So if you authorize Joe or anyone else to work on your system, you need to train them in any peculiarities of its installation and operation.  If they work on it without your authorization and training, then they take on the obligation of any smoke that gets out.

wx5u -> This is not "PoE" or "Power over Ethernet," which is a defined standard.  We should probably not use that term.

How about "Power over Ethernet Cabling" (POEC)?

Actually I like POTSAC (Power Over Too Small A Conductor).  Wink

--
KJ4AJP


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I'm not part of the development team, so take what I say with a grain of salt. I'm also easily confused.

Check out the free Wireless Networking Book
 Subject :Re:Re:Homebrew Power over Ethernet.. 2013-06-13- 02:32:57 
KJ4AJP
Member
Joined: 2013-03-24- 12:21:59
Posts: 35
Location: NW Tennessee EM56ni
 

Thanks for the offer (and testing tips from you and KD5MFW). 

I actually have a Gv2 that took the firmware but doesn't show S/N ratio, so I assume the radio's dead in it.  I kick myself for giving the guy good feedback for quick shipping before testing it, but absorbed its minimal cost in the other 5 I bought from other sellers that did work, and in particular the GLv1.1 that was given me by a non-ham (the one with DD-WRT I had issues with).  I did try desoldering the RP-TNC from the dead one but the body was acting as a heatsink and after burning my fingers enough I decided to cut the coax on the crippled one, solder on the 1/2W and put the PCB back in it's case.  The plan is to use it with a 2W amp, so I only need one output anyway.  It's working fine with the stock antenna, linking with the other 5.  I have them all set up in the office (PBX room here at the University, I'm the Telephone Tech), I'm just waiting on $$$ for antennas and adapters (and VoIP hardware... and IP cameras...). Then I can get out and do some "real world" distance tests

I'm glad to see MESH made QST's cover!  I'm having a blast with them so far, 10 years ago when I was doing the University's data wiring and 5 before I got the Ham license, I was doing things like this:

http://www.utm.edu/staff/relmore/wireless/

My main supplier was Hyperlink, this was before they were acquired by L-Com, and I bought connectors and tooling from FAB.  We had limited clients attaching to the network back then, now with every student having a smartphone looking for an IP there are around 800 Aruba APs across Campus.

Our area is fairly flat, and trees grow taller than the 4-story buildings on Campus (tallest buildings in the area), so I don't know how well MESH can be implemented for any long-range use, but I just need to get out and experiment once I have the goodies.

--
KJ4AJP



[K5KTF 2013-06-12- 12:05:13]:

BTW, if you want, I have a couple dead wrt's that have perfectly good RP-TNC's that can be scarfed from (I have already grabbed some parts off them)

Or, you can always take the coax right to the PC board from an N connector in an enclosure or something. We have done that, removed the TNC's and wired straight to N's.


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 Subject :Re:Homebrew Power over Ethernet.. 2013-06-13- 02:44:20 
K5KTF
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Joined: 2010-01-18- 23:04:04
Posts: 266
Location: 5' from this webserver
  

The trick to working the RP-TNC's is a hot iron (I crank my Weller up to 850 (max)), and then hold it over 2 pins (of the 4 corners) at once, and work it back and forth, lifting each side a bit at a time.

If the iron isnt hot enough, it wont budge and/or you will burn the PCB (been there done that).

Times like these I wish I had my dads ol 1950's era monster iron (it was like 450W or something...more for soldering gutters or something) :-)

Good Luck

KTF


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B-) Jim K5KTF EM10bm Cedar Park, TX :star:
 Subject :Re:Re:Re:Homebrew Power over Ethernet.. 2013-06-13- 03:09:42 
KJ4AJP
Member
Joined: 2013-03-24- 12:21:59
Posts: 35
Location: NW Tennessee EM56ni
 

Which is why I stated that my routers will remain unmodified (so you're preaching to the choir).

With all due respect to the human race, in my "day job" I've dealt with PHDs who don't have the sense to use a telephone.  I would expect no more or no less from a licensed Amateur Radio operator and a clearly labeled WRT54G or a homebrew POTSAC.

--
KJ4AJP



[wx5u 2013-06-12- 13:58:11]:


I'm sure pointing the finger at Joe will be much appreciated after the damage is done, perhaps during an emergency, or when he damages the network switch at some public safety site where your local ham radio group is helping. 

Or when you apologize because you gave Joe the wrong router and though you had given him one of the ones you hadn't modified the power on.




[KJ4AJP 2013-06-11- 02:30:35]:

wx5u -> Plugging one of our bootleg ethernet powered connectors into a "standard" gigabit ethernet device, it might cause damage.
<snip>
wx5u -> If your buddy Joe is working on your HSMM repeater site and decides to plug his laptop into your "ethernet" cable, you might damage something.

No, Joe might damage something.  Your FCC license gives you the leeway to experiment with your equipment, and if you're going to modify anything it stops being "plug and play".  So if you authorize Joe or anyone else to work on your system, you need to train them in any peculiarities of its installation and operation.  If they work on it without your authorization and training, then they take on the obligation of any smoke that gets out.

wx5u -> This is not "PoE" or "Power over Ethernet," which is a defined standard.  We should probably not use that term.

How about "Power over Ethernet Cabling" (POEC)?

Actually I like POTSAC (Power Over Too Small A Conductor).  Wink

--
KJ4AJP



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 Subject :Re:Re:Homebrew Power over Ethernet.. 2013-06-26- 01:57:41 
N8HUL
Member
Joined: 2013-06-25- 20:23:44
Posts: 7
Location
Which is why I stated that my routers will remain unmodified (so you're preaching to the choir). With all due respect to the human race, in my "day job" I've dealt with PHDs who don't have the sense to use a telephone. I would expect no more or no less from a licensed Amateur Radio operator and a clearly labeled WRT54G or a homebrew POTSAC. -- KJ4AJP -------------------------------------------------------------------------------- I can relate oh so well...!!!! PhD doesn't always = common sense.
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 Subject :Re:Re:Homebrew Power over Ethernet.. 2013-06-26- 03:22:07 
K5KTF
Admin
Joined: 2010-01-18- 23:04:04
Posts: 266
Location: 5' from this webserver
  
When I made the suggestion to do the PoE mod to the back of the WRT board, it is an OPTION, not a REQUIREMENT. It DOES come in useful if you are installing something and you want to piggyback power and/or not have to split out up top. SOME may find it useful. Others like yourself have the right to be leery and not do it. As for the last line of your post, the biggest irony in life that I have found is that common sense is not common.
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B-) Jim K5KTF EM10bm Cedar Park, TX :star:
 Subject :Re:Homebrew Power over Ethernet.. 2015-07-23- 15:18:48 
N7SKV
Member
Joined: 2013-03-05- 10:33:11
Posts: 10
Location: Peoria, Arizona DM33uq

Easiest way to power through the Ethernet cable. I used blue and blue/white as positive. Brown and brown/white as negative. Cut at both ends of the cable so no power running back into my computer. Twisted the the blue two together, and the brown two together. Soldered the power supply at one end and the plug on the other. This way there is no modifications to the router, only a cable mod.

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Last Edited On: 2015-07-23- 15:22:47 By N7SKV for the Reason
emsnaz@phxinternet.com

N7SKV
 Subject :Re:Homebrew Power over Ethernet.. 2015-07-23- 15:19:03 
N7SKV
Member
Joined: 2013-03-05- 10:33:11
Posts: 10
Location: Peoria, Arizona DM33uq

Easiest way to power through the Ethernet cable. I used blue and blue/white as positive. Brown and brown/white as negative. Cut at both ends of the cable so no power running back into my computer. Twisted the the blue two together, and the brown two together. Soldered the power supply at one end and the plug on the other.

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emsnaz@phxinternet.com

N7SKV
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