Groups > sci.electronics.design > #459277

Re: Patch-panel fabrication (POE)

From	Jan Panteltje <pNaOnStPeAlMtje@yahoo.com>
Newsgroups	sci.electronics.design
Subject	Re: Patch-panel fabrication (POE)
Date	2017-05-07 19:48 +0000
Organization	Datemas.de http://www.news.datemas.de
Message-ID	<oentn2$rb7$1@news.datemas.de> (permalink)
References	(4 earlier) <oelj65$l44$1@dont-email.me> <oenljd$d9k$1@news.datemas.de> <oenq1n$kb3$1@dont-email.me> <oenqol$m37$1@news.datemas.de> <oens2e$reg$1@dont-email.me>

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On a sunny day (Sun, 7 May 2017 12:24:25 -0700) it happened Don Y
<blockedofcourse@foo.invalid> wrote in <oens2e$reg$1@dont-email.me>:

>On 5/7/2017 11:58 AM, Jan Panteltje wrote:
>> On a sunny day (Sun, 7 May 2017 11:49:53 -0700) it happened Don Y
>> <blockedofcourse@foo.invalid> wrote in <oenq1n$kb3$1@dont-email.me>:
>>
>>>> So it could cause damage to somebodies stuff if they plug it in and has that connector or a similar one.
>>>> I am replacing all those connectors by HLJ6115ANL, also because it has 7,8 and 4,5 accessible and I need that to get the
>>>> POE.
>>>>  http://www.ebay.com/itm/271891560407
>>>> But that is not something you can do with just any laptop... you plug in.
>>>
>>> Hmmm... are you suggesting the problem is OTHER devices that might get plugged
>>> into my network?
>>
>> Exactly.
>
>There's a hardware handshake that transpires between the PSE and a
>potential PD.  The PSE looks for characteristic resistances on the signal
>leads and, based on what it senses, determines what class of PD device
>is being plugged.  If it senses a noncompliant device, it doesn't
>apply power to the conductors.


I think it is problematic unless there is some question - response, say 'what are you',
'I am an 48 V device', OK, power on.
Just from the load (test current at some voltage, say resistance check) it would be very hard,
so many possibilities.


>This is how you prevent things like (analog!) telephones misplugged into PoE
>jacks from wreaking havoc.


I am worried about house guest finding an ethernet socket and plugging in their 2K$ laptop,
hey even my own.
You can check though, with an ohm meter, 7,8 to 4.5 if it is infinite it is probably OK.

 
>> Yes, OK, I use these selectively to places where I am sure there is only my own equipment connected:
>>  http://www.ebay.com/itm/151643358383
>> with my own power supply of course.
>
>Yes, Cisco has a little device that impresses 48V on the unused pairs
>for their (older) AP's.  But, it's literally just an adapter from
>48VDC wall wart "barrel connector" to midspan injector.  Plug one
>of the devices you're worrying about, above, into it and it
>will gladly deliver 48V @ 380mA to the "load".

Yes that is what this thing is, but price is good.

Thread

Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-03 12:54 -0700
  Re: Patch-panel fabrication Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-03 13:23 -0700
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 00:10 -0700
      Re: Patch-panel fabrication Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-04 11:27 -0700
        Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 11:43 -0700
        Re: Patch-panel fabrication Clifford Heath <no.spam@please.net> - 2017-05-05 08:57 +1000
          Re: Patch-panel fabrication Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-06 05:47 -0700
        Re: Patch-panel fabrication krw@notreal.com - 2017-05-04 19:37 -0400
      Re: Patch-panel fabrication Neon John <no@never.com> - 2017-05-04 17:56 -0400
        Re: Patch-panel fabrication Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-05-06 05:46 -0700
      Re: Patch-panel fabrication Jasen Betts <jasen@xnet.co.nz> - 2017-05-11 05:57 +0000
        Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-11 10:37 -0700
  Re: Patch-panel fabrication Martin Riddle <martin_ridd@verizon.net> - 2017-05-03 20:32 -0400
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-03 23:59 -0700
  Re: Patch-panel fabrication Jasen Betts <jasen@xnet.co.nz> - 2017-05-04 06:34 +0000
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 01:45 -0700
  Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-04 01:52 -0700
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 11:42 -0700
      Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-04 21:22 -0700
        Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 23:04 -0700
          Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-04 23:24 -0700
            Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-05 00:19 -0700
              Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-05 00:45 -0700
                Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-05 02:17 -0700
  Re: Patch-panel fabrication jrwalliker@gmail.com - 2017-05-04 08:40 -0700
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 10:12 -0700
      Re: Patch-panel fabrication jrwalliker@gmail.com - 2017-05-04 10:27 -0700
        Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 11:01 -0700
          Re: Patch-panel fabrication makolber@yahoo.com - 2017-05-04 11:18 -0700
            Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-04 11:27 -0700
      Re: Patch-panel fabrication Don Kuenz <g@crcomp.net> - 2017-05-06 05:33 +0000
        Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-06 15:40 -0700
          Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-06 20:15 -0700
            Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-06 23:47 -0700
              Re: Patch-panel fabrication whit3rd <whit3rd@gmail.com> - 2017-05-07 03:51 -0700
                Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-07 05:20 -0700
          Re: Patch-panel fabrication (POE) Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-05-07 17:30 +0000
            Re: Patch-panel fabrication (POE) Don Y <blockedofcourse@foo.invalid> - 2017-05-07 11:49 -0700
              Re: Patch-panel fabrication (POE) Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-05-07 18:58 +0000
                Re: Patch-panel fabrication (POE) Don Y <blockedofcourse@foo.invalid> - 2017-05-07 12:24 -0700
                Re: Patch-panel fabrication (POE) Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-05-07 19:48 +0000
                Re: Patch-panel fabrication (POE) Don Y <blockedofcourse@foo.invalid> - 2017-05-07 13:29 -0700
                Re: Patch-panel fabrication (POE) Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-05-07 20:54 +0000
  Re: Patch-panel fabrication Allan Herriman <allanherriman@hotmail.com> - 2017-05-07 10:35 +0000
    Re: Patch-panel fabrication Don Y <blockedofcourse@foo.invalid> - 2017-05-07 05:26 -0700

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