Rack panel POE for UBNT products ?

[Dade_Marfi]

Im long searched rack panel POE for UBNT products, and im found only this :

http://www.epct.com.tw/product_info.php?cPath=251_255&products_id=1717

knows anybody where buy this panel ??

thanks

[rockhead]

Something is gonna get roasted at :
Output 48V 120W (Min)

They seemed to mention a 24V version as well but you better be sure its 24V peak as opposed to 24V nominal or again, sniff sniff, hey what the ... oh no.

Once you let the "factory smoke" out of the chips they're never the same again.

[Dave-D]

Dade, that 'rack panel POE' appears to be
nothing more than a standard rack panel
with all the power leads connected together,
and a single power supply for all.

You could easily make one.

One huge problem with this kind of panel is that
any single jack can output full power from the
power supply. For example, one shorted cable
would receive all 120W--which could easily start
a fire--and doesn't meet proper safety codes.

There don't even appear to be fuses on each
jack, which is the minimum level of protection.
And there is definitely no transient protection
and no shielding--both required for radios. Dave

[Dade_Marfi]

hey we've backed up power supply 15V and use patch panel as POE injectors :D

image :

http://www.nas-net.org/poe/1w.jpg

http://www.nas-net.org/poe/2w.jpg

product by http://www.epct.com.tw is more elegant :) but I don't know where him buy ?

[Dave-D]

Dade, as I said, you could easily make
a rack-panel PoE; it looks like you did.

But did you even read my reply? Your PoE
panel doesn't have critical protection. Dave

[Dade_Marfi]

Dave.D ... to everyone PoE port can add PPTC ( http://en.wikipedia.org/wiki/PPTC ) and is protection :) power supply ... and against atmospheric surge just use shield UTP (FTP) and patch panel with shild ports - cover port connect to earth.

[Dave-D]

No, Dade, that's not correct.

A transient protector circuit is included
in a Ubiquiti PoE supply. Simple shielding
and grounding help, but they do not provide
this protection. You could add such a circuit
to each jack, but it would be expensive. And
there's no place to mount the circuit board.

And you could add PPTC protectors on
each output jack; that would also cost extra,
and there is no place to put that circuit board
on a jack panel either. Dave

[Dade_Marfi]

in my panel isn't jack conector, all PoE ports are connected to cable cysy 2.5*2 ... this cable is connected to circuit breaker (every panel in rack has personal circuit breaker) and all circuit breaker are connected to backed up power supply 15V

[Dave-D]

I understand your design, and I advise
against using it. You need current limiting
for each jack. That's because if any one
jack is shorted, it could draw as much as
the circuit-breaker limit for all jacks on
that panel--pehaps over 120W. That is
a serious fire hazard, and is illegal. Dave

[Dade_Marfi]

but in my panels is not jack connectors ! in my panel is strong cable 2.5 mm2 copper ... this is overlarge .. here is not hazard of fire.

in http://www.epct.com.tw panel is jack connector ... there it is possible danger

[Dave-D]

Yes, your panel has RJ45 jacks; those jacks
connect to the radios. If a single CAT5 cable
to any radio has a short, it will receive all the
power in your power supply--a fire hazard.

It doesn't matter what cable or connector 'jack'
you use to link the jack panel to the power supply.
That cable and jack are not a fire hazard. Dave

[Dade_Marfi]

and what is difference, if i use ubnt PoE ? ... that every one radios has one PoE ?

[Dave-D]

Yes, that is one difference.

I'm not trying to say that you can only
use Ubiquiti PoE devices. But if you use
others, they should have power limits,
transient protection and shield ground
for each output port--each radio.

If you use 802.3af devices, they will have
power limits on each output port. You can
buy switches and routers with this feature.

If you use other individual PoE supplies,
you can add transient protection and
grounding separately. Dave

[WHT]

This ain't rocket science. Just get a $70 12-volt 18-amp power supply like CCTV and surveillance alarms use with 18 fused ports with power LEDs, and two 8-port patch panels.

[Dave-D]

Sure thing!

Find some patch panels with shielded jacks,
find some way to add transient protection,
and you have a solution. Dave

[cam]

or better yet, UBNT can make a Rack Mount PoE which people have been craving for....

[Dade_Marfi]

please WHT where it is possible buy this CCTV rack panel ?

[Dade_Marfi]

to Dave.D we used only UBNT products as bullet, bulletM5, nano, loco ..

[Dave-D]

Dade, WHT was not talking about a CCTV
rack panel. He was describing a CCTV power
supply that has separate power outputs for
several cameras. Each output has a fuse
for protection as I recommended to you.

You have to buy a separate rack panel with
shielded jacks and separate transient
protectors. You have to wire each jack in
that rack panel to the CCTV power supply. Dave

[cz_ranger]

In case anyone is interested, I have designed PCBs that turn plain 10/100M switch into PoE switch - it is based on Dlink DES-1016D, which has the further advantage of being manageable via openrrcp. Currently I do not limit max current on each port, but that is easily and quite cheaply done via reversible PCB fuse.

Tom

[kissas]

In case anyone is interested, I have designed PCBs that turn plain 10/100M switch into PoE switch - it is based on Dlink DES-1016D, which has the further advantage of being manageable via openrrcp. Currently I do not limit max current on each port, but that is easily and quite cheaply done via reversible PCB fuse.

Tom
i'm interested.

[cz_ranger]

Okay, here is the link

http://www.cemotel.cz/projects/

Comments and improvements are welcome.

Tom

[sxpert]

I'd rather have a "smart" patch panel, with an ethernet port for controlling each device separately, including routines to


turn off
turn on
reboot
test connectivity and power cycle if failed
reset to factory default
put the device in tftp mode
flash device with uploaded firmware
measure voltage at the input
measure input current
measure current used by each device
completely SNMP enabled


hardware features :


90-240v power input
solar panel input
connectors to plug in a big Pb (lead) gel battery
battery voltage & current metering
charge controller


with 1, 4, 8 and 16 devices models
I'd be ready to put between 250 and 300€ into that kind of device

[Scott@Wisp-Router]

Is something like this what you guys are looking for?

http://www.tyconpower.com/products/accessories.htm#Midspan

They also have a 5 port non-standard voltage PoE switch.

http://www.tyconpower.com/products/accessories.htm#Switch

[sxpert]

Is something like this what you guys are looking for?

http://www.tyconpower.com/products/accessories.htm#Midspan

They also have a 5 port non-standard voltage PoE switch.

http://www.tyconpower.com/products/accessories.htm#Switch

These only cover a small portion of my needs, unfortunately. I need something much more advanced...

[drwho17]

or better yet, UBNT can make a Rack Mount PoE which people have been craving for....
http://www.inscapedata.com/lps.htm, I got one of these when they came out last month. So far no troubles, does POE injection, 5 port switch and PDU functionality, only thing missing is battery backup/line conditioning. It's a very nice product for wireless tower deployments.

[Scott@Wisp-Router]

These only cover a small portion of my needs, unfortunately. I need something much more advanced...

What other features are you looking for?

[Dave-D]

Scott, sxpert listed them all in post #23.

I sure wish some company would just make
one of these, so we can stop discussing it! Dave

[kijoma]

hi,

we often pop apart the small white block poe units, solder a link wired across for each PoE pin so it is passthrough.

then a single power adaptor can feed the external access unit and.. the internal wifi unit (pico 2 etc..)..

as for multiport poe, we got a bunch of the poe blocks that come with a short lead with rj45 on it and a flying jack socket for power etc.. the neatly can be glued together in a row.. the jacks can be removed or fed with plugs which can be individually fused if need be.

this works with any multiport router/switch.. with MT rB's it is just as easy to link the two pins on the back of the rj45 sockets across using kynar wire to the DC jack.. (kynar is thin and will fuse if shorted).

the Ubiquti white block PoE;s do not have any fuse in them.

The MT D shaped ones as supplied with RC522 kits do have one and its the biggest pain in the butt possible if you get a power surge as they go O/C until the power is cycled.. I mentioned it on the MT forums, it probably sped up my ban! :icon_mrgreen: . i note they don't seem to use them any more!

[cz_ranger]

sxpert your wishlist is indeed quite long... the idea was to create something cheap, nice & simple. However it is quite easy to add one piece of routerStation to the mix and control power on ports via GPIO (just a few optocouplers are needed here).

Based on my experience it is not the best idea to build one complicated with tons of features, we rather use a separate power supply with battery backup.... you know, just in case something breaks, you don't need to change everything...


# turn off
# turn on
# reboot
# test connectivity and power cycle if failed
# completely SNMP enabled

These are rather easy to be done, RS could handle all that


# reset to factory default
# put the device in tftp mode
# flash device with uploaded firmware

I don't see how these features could be implemented without further modification of the connected devices...


# measure voltage at the input
# measure input current
# measure current used by each device

This could be done, but I don't see what use would it have except for being cool. Perhaps the input current measurement (total consumed makes sense). Still you can estimate that rather precisely...

[sxpert]

I don't see how these features could be implemented without further modification of the connected devices...

by implementing the same thing the Ubnt 24v POE does for the reset button on the POE device


This could be done, but I don't see what use would it have except for being cool. Perhaps the input current measurement (total consumed makes sense). Still you can estimate that rather precisely...
that's very important to analyze when the battery needs changed for instance

[cz_ranger]

by implementing the same thing the Ubnt 24v POE does for the reset button on the POE device
seems I have completely missed that functionality, probably because none of the +200 ubnt devices I manage ever needed that done in field... I'll check if there is any info on the implementation of that, but under these circumstances it seems to be doable

that's very important to analyze when the battery needs changed for instance
I have to disagree on this one, all you need to know here is the battery voltage, logic signal telling you what is the status of AC supply power and perhaps total power output (that's a bonus feature). You can estimate your power consumption quite exactly based on measured power consumption of the connected devices, which does not vary more then some 5%. Unless of course your idea is to turn single devices on and off all the time...

[Scott@Wisp-Router]

Dave, is there such a beast in the 802.3af world that comes even close to matching those specs?

[rspaeth]

Can I suggest getting this instead?

http://www.streakwave.com/Itemdesc.asp?ic=TP-NCMS312-18&eq=&Tp=

This is what I use and it works wonderfully!

[cz_ranger]

Can I suggest getting this instead?

http://www.streakwave.com/Itemdesc.asp?ic=TP-NCMS312-18&eq=&Tp=

This is what I use and it works wonderfully!

It seems to have only one problem - it is about 5 times more expensive than my solution without any added benefit that I could see ....