Like I said before; 375 milliamps per pin/wire.
bp
<part15sbs{at}gmail{dot}com>
On 11/15/2016 7:25 AM, Ken Hohhof wrote:
I wouldn’t look at the max rating on an RJ45 plug and decide it’s safe
to run it at that voltage or current level. The contact is still a
couple gold plated wires pressing against each other. Not like your
typical connector with much higher contact force and area. And the
plug/jack alignment and retention method is poor. And we use them in
non ideal situations with cables trying to pull the plug one way or
the other, vibration from wind or motors, condensation, wide
temperature swings.
I also recall that currents in this range were used on telephone
copper pairs to “seal” splices – break down oxidation – and when the
current would punch through the oxidation, it would causes audible
pops. Now, that was splices not modular plugs, I don’t know if
something similar happens with an RJ connection.
Gold-gold connections are also susceptible to fretting corrosion, if
there is even the slightest vibration. Once that happens, I suspect
the connection would build up resistance, and running a lot of current
through it would cause heating and eventually cause failure. Fretting
corrosion can be inhibited with a suitable contact lubricant, I don’t
know if silicone grease works, I suspect not and that you would need
both a lubricant and a grease to keep out moisture.
*From:*Af [mailto:[email protected]] *On Behalf Of *Bill Prince
*Sent:* Tuesday, November 15, 2016 9:14 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] Packetflux & 450M Timing
Way beyond what I would be comfortable with.
bp
<part15sbs{at}gmail{dot}com>
On 11/15/2016 7:10 AM, Chuck McCown wrote:
300V nominally but you can get 600V cable. And since those
insulation ratings are derated, pretty sure you can double them
before sparks start flying.
*From:*Bill Prince
*Sent:*Tuesday, November 15, 2016 7:56 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Packetflux & 450M Timing
What's the breakdown voltage on the insulation for a 22 AWG wire?
bp
<part15sbs{at}gmail{dot}com>
On 11/15/2016 6:54 AM, Chuck McCown wrote:
Perhaps jack it up to 1000 volts, 12 amps...
Run your whole house off of a cat 5.
Now that would be an interesting youtube video.
*From:*Bill Prince
*Sent:*Tuesday, November 15, 2016 7:51 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Packetflux & 450M Timing
Using that kind of power scheme, and 48 volts, you're talking
about over 500 watts? No way!
bp
<part15sbs{at}gmail{dot}com>
On 11/15/2016 6:26 AM, Chuck McCown wrote:
Tower ground earth ground etc, like Trango does.
Yes, I do, the manufacturer of the jacks I use rates them
at 1.5 amps.
But you better not plug them in under load...
*From:*Bill Prince
*Sent:*Tuesday, November 15, 2016 7:22 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Packetflux & 450M Timing
All one polarity? Where's the drain? You really think you
can get 1-1/2 amps through each of those teeny little RJ45
connections?
bp
<part15sbs{at}gmail{dot}com>
On 11/15/2016 6:14 AM, Chuck McCown wrote:
I am talking about all wires being one polarity. I
think I can get 12 amps without melting anything.
*From:*Bill Prince
*Sent:*Monday, November 14, 2016 5:41 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Packetflux & 450M Timing
Let me be more clear.
The circuit that is pins 4,5 (+), and pins 7,8 (-) is
one circuit. Total of .75 amps.
The circuit that is pins 1,2 (-), and pins 3,6 (+) is
one circuit. Total of .75 amps.
That puts 375 milliamps on each pin and each wire.
That's because the power/current that is going in on
pins 7 & 8, has to return on pins 4 & 5. You can't
double that.
Possibly more than I would be comfortable with anyway.
bp
<part15sbs{at}gmail{dot}com>
On 11/14/2016 12:18 PM, Chuck McCown wrote:
Half an amp per wire on one chart, 3.5 amps on
another chart. Heating and insulation temperature
rating are going to be the limiting factors there.
Jacks I use have a 1.5 amp rating per pin.
So, I think you can get 12 amps total if the cable
is short enough.
*From:*Bill Prince
*Sent:*Monday, November 14, 2016 1:11 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Packetflux & 450M Timing
Each pair is one half of a power circuit. So there
are 4 halves. There are two issues; how much
current can each wire carry, and how much current
can each connector pin can carry.
bp
<part15sbs{at}gmail{dot}com>
On 11/14/2016 11:59 AM, Josh Luthman wrote:
There are four pairs. AF5x and the H in 24vh
or 48vh POE ports of Netonix do power over all
four pairs. Speaking with Ubnt support last
week, AF5x should ideally do four pairs when
possible.
48v (0.75*4a) = 144 watts
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Mon, Nov 14, 2016 at 2:44 PM, Bill Prince
<[email protected]
<mailto:[email protected]>> wrote:
At 48 volts, and .75 amps per pair of
power wires, that would be 36 watts + 36
watts, or 72 watts total?
Just noodling here.
bp
<part15sbs{at}gmail{dot}com>
On 11/14/2016 11:38 AM, George Skorup wrote:
For the record,
http://store.packetflux.com/powerinjector-plus-sync-gigabit-version/
says: 1A per port maximum power. (48
watts at 48 Volts)
So.. is the electronic over-current
protection the 1A limit? Or is this
just outdated info? Pretty sure it's
>1A because I've "tested" it (cable
leaking water into the GigE-APC, the
port didn't trip, and the card was hot
as hell).
I was also unaware that Cambium won't
be supporting sync-over-power on the
450m. I imagine the ringing/bounce
issue killed that idea due to the high
power consumption.
On 11/14/2016 1:00 PM, Forrest
Christian (List Account) wrote:
The current products should power
the 450M just fine. The rating is
1A per pair per port, so at the
48V you're good up to 96W.
On Nov 14, 2016 7:50 PM, "George
Skorup" <[email protected]
<mailto:[email protected]>> wrote:
The 450m pulls 70 watts. The
current
SyncInjector/PowerInjector+Sync
is around 1A max per port.
What you could do for now is a
GigE-POE-APC and the new aux
port version SyncBox Junior.
On 11/14/2016 12:34 PM, Matt
wrote:
Shouldn't the sync over
power for the 450M be the
same as PMP450i?
How is the 1u sync
injector coming?
On Mon, Nov 14, 2016 at
12:30 PM, Forrest
Christian (List Account)
<[email protected]
<mailto:[email protected]>>
wrote:
All of the currently
shipping syncbox
product line are
compatible. For sync
over power, I have the
specs, but the design
isn't done yet.
On Nov 14, 2016 5:40
PM, "Sam Lambie"
<[email protected]
<mailto:[email protected]>>
wrote:
A question for
Forrest mostly.
Have you come up
with a timing
product for
the 450m AP yet?
If not, have you
got a timeline for
release?
Sam
--
--
Sam Lambie
Taosnet Wireless Tech.
575-758-7598
<tel:575-758-7598>
Office
www.Taosnet.com
<http://www.Taosnet.com>
