Re: [asterisk-users] POE Splitters

2010-07-23 Thread Matt
You're using phones that draw 15Watts?!?!  Let me know what brand this is so
I can stay away from them.

On Thu, Jul 22, 2010 at 2:58 PM, David Gibbons d...@videon-central.comwrote:

 There is no such device -- it's outside of the POE spec.

 Class 3 devices are allowed to consume at max 15.4W. Most phones are class
 3 devices. The math just doesn't work out. Even if you used the draft
 standard for class 4 (~30W), you could still power max 2 devices at 15W/ea.

 -Dave

 On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:

 I've got an interesting situation where I have one cable run from the feed
 area to the service area.   I have three devices that I need to power at the
 service area.  Is anyone aware of a device that will take the POE from the
 cable run and then allow me to split it to two or three devices at the
 service end?

 When I search for splitter all I get are the injectors, but I figure
 someone has to make something I realize I'll need a power adapter with
 enough amps to power the full load at the end.

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Matt
It's not necessarily this simple.  There is an approximately 50-75foot cable
run through ceilings and walls (CAT5) to the location where the phones will
be.  At the phone location there is no power.

On Thu, Jul 22, 2010 at 11:33 PM, David Backeberg dbackeb...@gmail.comwrote:

 On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:
  I've got an interesting situation where I have one cable run from the
 feed
  area to the service area.   I have three devices that I need to power at
 the
  service area.  Is anyone aware of a device that will take the POE from
 the
  cable run and then allow me to split it to two or three devices at the
  service end?

 The obvious answer is don't do that.

 *buy DC power bricks for the phones / devices
 *buy a small PoE switch for the area, plugged into the single ethernet
 cable as a trunk
 *pull more cable from the original endpoint

 Any of those three will be more reliable and predictable when
 debugging than inventing your own PoE solution. I've tried to invent
 my own PoE solution using a soldering iron and bulk ethernet cable.
 Take it from me, don't go down that road. Yes, you will learn all
 manner of interesting things about DC voltage loss over distance,
 blah, blah, blah.

 Your time is almost undoubtedly worth more money than you'll save by
 pursuing the 'conventional approaches'. Just don't do it.

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Kevin P. Fleming
On 07/23/2010 02:46 PM, Matt wrote:
 It's not necessarily this simple.  There is an approximately 50-75foot
 cable run through ceilings and walls (CAT5) to the location where the
 phones will be.  At the phone location there is no power.

I thought it was fairly obvious, but search for PoE extractor. Here's
an example:

http://www.shireeninc.com/poe-extractor.html

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread David Backeberg
On Fri, Jul 23, 2010 at 8:46 AM, Matt mhop...@gmail.com wrote:
 It's not necessarily this simple.  There is an approximately 50-75foot cable
 run through ceilings and walls (CAT5) to the location where the phones will
 be.  At the phone location there is no power.

You always have options. You just have to decide what is more difficult:

* moving the phone/devices somewhere else. Easiest solution.
* having an electrician pull AC power to the location, then use DC
power bricks or PoE switch
* having a data cable person pull more ethernet to the location

If you already have one ethernet cable that managed to make that 50-75
foot run, then clearly it can be done, and a professional could even
use that cable to yank three more along the same run, and then you're
all set.

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread bruce bruce
You can also use Ethernet Over Power Lines solution or wireless :-)

On Fri, Jul 23, 2010 at 8:55 AM, David Backeberg dbackeb...@gmail.comwrote:

 On Fri, Jul 23, 2010 at 8:46 AM, Matt mhop...@gmail.com wrote:
  It's not necessarily this simple.  There is an approximately 50-75foot
 cable
  run through ceilings and walls (CAT5) to the location where the phones
 will
  be.  At the phone location there is no power.

 You always have options. You just have to decide what is more difficult:

 * moving the phone/devices somewhere else. Easiest solution.
 * having an electrician pull AC power to the location, then use DC
 power bricks or PoE switch
 * having a data cable person pull more ethernet to the location

 If you already have one ethernet cable that managed to make that 50-75
 foot run, then clearly it can be done, and a professional could even
 use that cable to yank three more along the same run, and then you're
 all set.

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Kevin P. Fleming
On 07/23/2010 04:40 PM, bruce bruce wrote:
 You can also use Ethernet Over Power Lines solution or wireless :-)

His issue wasn't getting the network connection delivered, it was the
power :-)

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Gordon Henderson
On Fri, 23 Jul 2010, Matt wrote:

 It's not necessarily this simple.  There is an approximately 50-75foot cable
 run through ceilings and walls (CAT5) to the location where the phones will
 be.  At the phone location there is no power.

Why not use analogue phones? Get some nice ones with caller ID display and 
use a multi-port ATA. I did that for a site recently - they had power, but 
the cable run was 175m. One cat-5 = 4 pairs = 4 phones. How many do you 
need?

Gordon

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Hans Witvliet
On Thu, 2010-07-22 at 17:41 -0500, Karl Fife wrote:

  enough amps to power the full load at the end.
 
 
 You could do someting with passive POE--in other words not 802.2af POE, but 
 rather the 'dumb' kind of POE which just injects power on the unused pairs. 
 Passive POE (being passive) does not have a hard wattage limit per drop 
 limitation imposed by 802.2af.  On the far end, you could split out the 
 power to run a 4-port 802.11af POE switch.
 
 Passive POE would preclude GigE, but at least you wouldn't have to add 
 ethernet drops.  In theory you could preserve GigE by looking for a IEEE 
 802.3at [sic] switch.  IEEE 802.3at allows 36 watts per port, but good luck 
 finding (or affording) a 802.3at-powered 3-port 802.2af POE switch even if 
 all 3 downstream devices don't draw the maximum wattage simultaneously :-)
 
afaicr there are not a lot of hard phones doing 1Gb,

And POE-switches that can do 1Gb resembles a jumbo-jet compares to other
planes; Both in price an amount of noise...

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Re: [asterisk-users] POE Splitters

2010-07-23 Thread Philip Prindeville

 Sounds like a great ear warmer!!!

Hell, you can probably grill a panini with it if you're patient.

On 7/23/10 6:39 AM, Matt wrote:

You're using phones that draw 15Watts?!?!  Let me know what brand this is so I 
can stay away from them.

On Thu, Jul 22, 2010 at 2:58 PM, David Gibbons d...@videon-central.com 
mailto:d...@videon-central.com wrote:

There is no such device -- it's outside of the POE spec.

Class 3 devices are allowed to consume at max 15.4W. Most phones are class 
3 devices. The math just doesn't work out. Even if you used the draft standard 
for class 4 (~30W), you could still power max 2 devices at 15W/ea.

-Dave

On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com 
mailto:mhop...@gmail.com wrote:

I've got an interesting situation where I have one cable run from the 
feed area to the service area.   I have three devices that I need to power at 
the service area.  Is anyone aware of a device that will take the POE from the 
cable run and then allow me to split it to two or three devices at the service 
end?

When I search for splitter all I get are the injectors, but I figure 
someone has to make something I realize I'll need a power adapter with 
enough amps to power the full load at the end.



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[asterisk-users] POE Splitters

2010-07-22 Thread Matt
I've got an interesting situation where I have one cable run from the feed
area to the service area.   I have three devices that I need to power at the
service area.  Is anyone aware of a device that will take the POE from the
cable run and then allow me to split it to two or three devices at the
service end?

When I search for splitter all I get are the injectors, but I figure someone
has to make something I realize I'll need a power adapter with enough
amps to power the full load at the end.
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Re: [asterisk-users] POE Splitters

2010-07-22 Thread David Gibbons
There is no such device -- it's outside of the POE spec.

Class 3 devices are allowed to consume at max 15.4W. Most phones are class 3
devices. The math just doesn't work out. Even if you used the draft standard
for class 4 (~30W), you could still power max 2 devices at 15W/ea.

-Dave

On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:

 I've got an interesting situation where I have one cable run from the feed
 area to the service area.   I have three devices that I need to power at the
 service area.  Is anyone aware of a device that will take the POE from the
 cable run and then allow me to split it to two or three devices at the
 service end?

 When I search for splitter all I get are the injectors, but I figure
 someone has to make something I realize I'll need a power adapter with
 enough amps to power the full load at the end.

 --
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Re: [asterisk-users] POE Splitters

2010-07-22 Thread John Novack
Will your single POE port even supply enough power to three devices 
without complaining?
Plus, what about the data?

Sounds as if you will need a smaller switch in the service area to 
supply power and data

John Novack


Matt wrote:
 I've got an interesting situation where I have one cable run from the 
 feed area to the service area.   I have three devices that I need to 
 power at the service area.  Is anyone aware of a device that will take 
 the POE from the cable run and then allow me to split it to two or 
 three devices at the service end?

 When I search for splitter all I get are the injectors, but I figure 
 someone has to make something I realize I'll need a power adapter 
 with enough amps to power the full load at the end.

-- 

Dog is my Co-pilot


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Re: [asterisk-users] POE Splitters

2010-07-22 Thread Andrew Latham
The Snom 360 phone in front of me draws 4w...


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lath...@gmail.com

* Learn more about OSS http://en.wikipedia.org/wiki/Open-source_software
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On Thu, Jul 22, 2010 at 2:58 PM, David Gibbons d...@videon-central.com wrote:
 There is no such device -- it's outside of the POE spec.

 Class 3 devices are allowed to consume at max 15.4W. Most phones are class 3
 devices. The math just doesn't work out. Even if you used the draft standard
 for class 4 (~30W), you could still power max 2 devices at 15W/ea.

 -Dave

 On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:

 I've got an interesting situation where I have one cable run from the feed
 area to the service area.   I have three devices that I need to power at the
 service area.  Is anyone aware of a device that will take the POE from the
 cable run and then allow me to split it to two or three devices at the
 service end?

 When I search for splitter all I get are the injectors, but I figure
 someone has to make something I realize I'll need a power adapter with
 enough amps to power the full load at the end.

 --
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Re: [asterisk-users] POE Splitters

2010-07-22 Thread Karl Fife

- Original Message - 
From: David Gibbons d...@videon-central.com
To: Asterisk Users Mailing List - Non-Commercial Discussion 
asterisk-users@lists.digium.com
Sent: Thursday, July 22, 2010 1:58 PM
Subject: Re: [asterisk-users] POE Splitters


 There is no such device -- it's outside of the POE spec.

 Class 3 devices are allowed to consume at max 15.4W. Most phones are class 
 3
 devices. The math just doesn't work out. Even if you used the draft 
 standard
 for class 4 (~30W), you could still power max 2 devices at 15W/ea.

 -Dave

 On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:

 I've got an interesting situation where I have one cable run from the 
 feed
 area to the service area.   I have three devices that I need to power at 
 the
 service area.  Is anyone aware of a device that will take the POE from 
 the
 cable run and then allow me to split it to two or three devices at the
 service end?

 When I search for splitter all I get are the injectors, but I figure
 someone has to make something I realize I'll need a power adapter 
 with
 enough amps to power the full load at the end.


You could do someting with passive POE--in other words not 802.2af POE, but 
rather the 'dumb' kind of POE which just injects power on the unused pairs. 
Passive POE (being passive) does not have a hard wattage limit per drop 
limitation imposed by 802.2af.  On the far end, you could split out the 
power to run a 4-port 802.11af POE switch.

Passive POE would preclude GigE, but at least you wouldn't have to add 
ethernet drops.  In theory you could preserve GigE by looking for a IEEE 
802.3at [sic] switch.  IEEE 802.3at allows 36 watts per port, but good luck 
finding (or affording) a 802.3at-powered 3-port 802.2af POE switch even if 
all 3 downstream devices don't draw the maximum wattage simultaneously :-)

-Karl














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Re: [asterisk-users] POE Splitters

2010-07-22 Thread bruce bruce
The Aastra 53i draws only 2 Watts from a Linksys 24 port POE switch. 25
phones is around 55 Watts.

-Bruce

On Thu, Jul 22, 2010 at 5:16 PM, Andrew Latham lath...@gmail.com wrote:

 The Snom 360 phone in front of me draws 4w...


 ~
 Andrew lathama Latham
 lath...@gmail.com

 * Learn more about OSS http://en.wikipedia.org/wiki/Open-source_software
 * Learn more about Linux http://en.wikipedia.org/wiki/Linux
 * Learn more about Tux http://en.wikipedia.org/wiki/Tux



 On Thu, Jul 22, 2010 at 2:58 PM, David Gibbons d...@videon-central.com
 wrote:
  There is no such device -- it's outside of the POE spec.
 
  Class 3 devices are allowed to consume at max 15.4W. Most phones are
 class 3
  devices. The math just doesn't work out. Even if you used the draft
 standard
  for class 4 (~30W), you could still power max 2 devices at 15W/ea.
 
  -Dave
 
  On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:
 
  I've got an interesting situation where I have one cable run from the
 feed
  area to the service area.   I have three devices that I need to power at
 the
  service area.  Is anyone aware of a device that will take the POE from
 the
  cable run and then allow me to split it to two or three devices at the
  service end?
 
  When I search for splitter all I get are the injectors, but I figure
  someone has to make something I realize I'll need a power adapter
 with
  enough amps to power the full load at the end.
 
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Re: [asterisk-users] POE Splitters

2010-07-22 Thread Michael Graves
Sometimes it doesn't matter what the device actually draws as much as
what it declares itself to be to the upstream switch. For example, most
polycom phones draw under 9 watts but in practice they declare
themselves to the switch as requiring the full 15.4 watts allowed by
802.11af class 1.

I've seen but never used the 3Com Netjacks, which seem like a possibly
nice solution to this kind of problem. They not only accept inbound
POE, but can have their own power supply and provide POE to several
downstream devices.

Michael


--Original Message Text---
From: bruce bruce
Date: Thu, 22 Jul 2010 19:09:07 -0400

The Aastra 53i draws only 2 Watts from a Linksys 24 port POE switch. 25
phones is around 55 Watts.

-Bruce

On Thu, Jul 22, 2010 at 5:16 PM, Andrew Latham lath...@gmail.com
wrote:
The Snom 360 phone in front of me draws 4w...


~
Andrew lathama Latham
lath...@gmail.com

* Learn more about OSS
http://en.wikipedia.org/wiki/Open-source_software
* Learn more about Linux http://en.wikipedia.org/wiki/Linux
* Learn more about Tux http://en.wikipedia.org/wiki/Tux




On Thu, Jul 22, 2010 at 2:58 PM, David Gibbons
d...@videon-central.com wrote:
 There is no such device -- it's outside of the POE spec.

 Class 3 devices are allowed to consume at max 15.4W. Most phones are class 3
 devices. The math just doesn't work out. Even if you used the draft standard
 for class 4 (~30W), you could still power max 2 devices at 15W/ea.

 -Dave

 On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:

 I've got an interesting situation where I have one cable run from the feed
 area to the service area.   I have three devices that I need to power at the
 service area.  Is anyone aware of a device that will take the POE from the
 cable run and then allow me to split it to two or three devices at the
 service end?

 When I search for splitter all I get are the injectors, but I figure
 someone has to make something I realize I'll need a power adapter with
 enough amps to power the full load at the end.

 --
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Re: [asterisk-users] POE Splitters

2010-07-22 Thread David Backeberg
On Thu, Jul 22, 2010 at 2:46 PM, Matt mhop...@gmail.com wrote:
 I've got an interesting situation where I have one cable run from the feed
 area to the service area.   I have three devices that I need to power at the
 service area.  Is anyone aware of a device that will take the POE from the
 cable run and then allow me to split it to two or three devices at the
 service end?

The obvious answer is don't do that.

*buy DC power bricks for the phones / devices
*buy a small PoE switch for the area, plugged into the single ethernet
cable as a trunk
*pull more cable from the original endpoint

Any of those three will be more reliable and predictable when
debugging than inventing your own PoE solution. I've tried to invent
my own PoE solution using a soldering iron and bulk ethernet cable.
Take it from me, don't go down that road. Yes, you will learn all
manner of interesting things about DC voltage loss over distance,
blah, blah, blah.

Your time is almost undoubtedly worth more money than you'll save by
pursuing the 'conventional approaches'. Just don't do it.

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