garymansperger
08-31-2009, 12:26 PM
Can this be used to go to a second NS5 m and provide power for it?
If so, how many can I daisy chain?
If so, how many can I daisy chain?
View Full Version : 2end eithernet port on NS5 M
PJ
09-01-2009, 10:35 AM
NS5M has two Ethernet ports
Main Port is Located on the left when looking at led side "back"
use main port to power in, second port is bridged and has power disabled by default
You can enable pass through power by clicking in advance tab Enable POE pass through
NS5M can use up to 24V DC and the limitation for power pass through is current limit "max 1.0A" , what ever voltage is fed to NS5M, the same voltage will appear on the 2nd Ethernet Port when enabled, The real limit will be hit by the Ethernet cable 700mA in most cases. Using Higher voltage will allow to power up more devices.
Main Port is Located on the left when looking at led side "back"
use main port to power in, second port is bridged and has power disabled by default
You can enable pass through power by clicking in advance tab Enable POE pass through
NS5M can use up to 24V DC and the limitation for power pass through is current limit "max 1.0A" , what ever voltage is fed to NS5M, the same voltage will appear on the 2nd Ethernet Port when enabled, The real limit will be hit by the Ethernet cable 700mA in most cases. Using Higher voltage will allow to power up more devices.
lncommunications
09-01-2009, 11:18 AM
I thought the new NanoM was 802.3af i.e. 48v?
But I would like to know a definitive answer to the original question, how many devices can we daisy chain? surely someones tested this!?
But I would like to know a definitive answer to the original question, how many devices can we daisy chain? surely someones tested this!?
InoX
09-01-2009, 02:47 PM
can you calculate? it's all about the power needed by the devices
UBNT-Mike.Ford
09-01-2009, 03:28 PM
I thought the new NanoM was 802.3af i.e. 48v?
But I would like to know a definitive answer to the original question, how many devices can we daisy chain? surely someones tested this!?
hello,
The NanoStation M's are not 802.3af. They accept a max voltage of 24V.
For the passthrough you cannot exceed 1A (etherent is limited to about 700MA.
Basically you can only daisy chain 2 NS5M off that port, or possible 3, but you are running over the capacity of the etherent cable at that point.
Thank,
Mike
But I would like to know a definitive answer to the original question, how many devices can we daisy chain? surely someones tested this!?
hello,
The NanoStation M's are not 802.3af. They accept a max voltage of 24V.
For the passthrough you cannot exceed 1A (etherent is limited to about 700MA.
Basically you can only daisy chain 2 NS5M off that port, or possible 3, but you are running over the capacity of the etherent cable at that point.
Thank,
Mike
lncommunications
09-01-2009, 03:51 PM
Yes I can thanks, but I first need to confirm that the NanoM can be powered by a 48v power supply...
Theoretically here are the figures, though I would feel happier if Ubiquiti would confirm...
24 Volts (PSU) / 8W (Max Consumption) = 240mA
48 Volts (PSU) / 8W (Max Consumption) = 120mA
Taking PJ's figure of 700mA max current for CAT5...
Basically if you can daist chain the following;
24 Volts = 2 NanoM's (possibly 3 if you wanna risk it @ 720mA)
48 Volts = 5 NanoM's (possibly 6 again @ 720mA)
I couldn't find any specific specs and figures for CAT5 max Amps but from the stuff I did find it goes something like this...
CAT5 = AWG24 Maximum amps for power transmission = 577mA (per core)
2 cores per terminal i.e. positive and negative so 577mA x 2 = 1154mA
...but ill take PJ's figure for now :)
Inox - I guess if you have the answer others would benefit from your knowledge, so please pray tell!
Theoretically here are the figures, though I would feel happier if Ubiquiti would confirm...
24 Volts (PSU) / 8W (Max Consumption) = 240mA
48 Volts (PSU) / 8W (Max Consumption) = 120mA
Taking PJ's figure of 700mA max current for CAT5...
Basically if you can daist chain the following;
24 Volts = 2 NanoM's (possibly 3 if you wanna risk it @ 720mA)
48 Volts = 5 NanoM's (possibly 6 again @ 720mA)
I couldn't find any specific specs and figures for CAT5 max Amps but from the stuff I did find it goes something like this...
CAT5 = AWG24 Maximum amps for power transmission = 577mA (per core)
2 cores per terminal i.e. positive and negative so 577mA x 2 = 1154mA
...but ill take PJ's figure for now :)
Inox - I guess if you have the answer others would benefit from your knowledge, so please pray tell!
lncommunications
09-01-2009, 03:51 PM
lol beat by Mike gutted.
lncommunications
09-01-2009, 04:51 PM
Can you explain this Mike or will wait if more details are due out shortly...
* Intelligent POE
Remote hardware reset circuitry of NanoStation M allows for device to be reset remotely from power supply location. In addition, any NanoStation can easily become 802.3af 48V compliant through use of Instant 802.3af adapter.
* Intelligent POE
Remote hardware reset circuitry of NanoStation M allows for device to be reset remotely from power supply location. In addition, any NanoStation can easily become 802.3af 48V compliant through use of Instant 802.3af adapter.
lncommunications
09-01-2009, 04:53 PM
Can you explain this Mike or will wait if more details are due out shortly...
* Intelligent POE
Remote hardware reset circuitry of NanoStation M allows for device to be reset remotely from power supply location. In addition, any NanoStation can easily become 802.3af 48V compliant through use of Instant 802.3af adapter.
Nevermind found the info...http://www.ubnt.com/forum/showthread.php?p=47174
...and yes multiport adaptors would be nice! :D:D:D
* Intelligent POE
Remote hardware reset circuitry of NanoStation M allows for device to be reset remotely from power supply location. In addition, any NanoStation can easily become 802.3af 48V compliant through use of Instant 802.3af adapter.
Nevermind found the info...http://www.ubnt.com/forum/showthread.php?p=47174
...and yes multiport adaptors would be nice! :D:D:D
rkj
09-01-2009, 10:32 PM
If you wanna go with 48V to power 24V devices, it would be better to use a DC-DC converter. Using 48V to go an inch near the devices would give you less cable-loss, and then power them with the voltage they want.
UBNT-Mike.Ford
09-02-2009, 09:36 AM
If you wanna go with 48V to power 24V devices, it would be better to use a DC-DC converter. Using 48V to go an inch near the devices would give you less cable-loss, and then power them with the voltage they want.
Witch is what our Instant802.3af adapter does.
Thanks,
Mike
Witch is what our Instant802.3af adapter does.
Thanks,
Mike
garymansperger
09-02-2009, 12:49 PM
My reason for asking original question is that I have a number of locations with one radio being a backhaul and then 1 or 2 APs connected to it. If I can chain them, I eliminate several cables and possibly power supplies and the switch that currently glues them together.
This would be very cool!
If I have gotten the drift from the replies, I can get away with a configuration of one backhaul and one AP (possibly not any of the "HP" units as the AP). Beyond that I may be pushing it?
This would be very cool!
If I have gotten the drift from the replies, I can get away with a configuration of one backhaul and one AP (possibly not any of the "HP" units as the AP). Beyond that I may be pushing it?
Ron
09-02-2009, 10:15 PM
My reason for asking original question is that I have a number of locations with one radio being a backhaul and then 1 or 2 APs connected to it. If I can chain them, I eliminate several cables and possibly power supplies and the switch that currently glues them together.
This would be very cool!
If I have gotten the drift from the replies, I can get away with a configuration of one backhaul and one AP (possibly not any of the "HP" units as the AP). Beyond that I may be pushing it?
I have been asking for this for a while, including here http://www.ubnt.com/forum/showthread.php?t=12707 .
Both Mikrotik and Pac Wireless make POE injectors at above 1A so I wouldn't worry about the cable when it comes to connecting 2-3 Nanos. What really bothers me is that I can't connect two rockets to one cat5e cable.
This would be very cool!
If I have gotten the drift from the replies, I can get away with a configuration of one backhaul and one AP (possibly not any of the "HP" units as the AP). Beyond that I may be pushing it?
I have been asking for this for a while, including here http://www.ubnt.com/forum/showthread.php?t=12707 .
Both Mikrotik and Pac Wireless make POE injectors at above 1A so I wouldn't worry about the cable when it comes to connecting 2-3 Nanos. What really bothers me is that I can't connect two rockets to one cat5e cable.
sbrown
09-16-2009, 11:02 PM
(posted this elsewhere on the forum thinking I was replying to this thread, opps :( )
Not feeling up to the math today... but the power supply that comes with the NS5M is 15V 0.8A - so 12Watts.
Max draw on two NS5M would be 16Watts... so a 18V to 24V power supply is basically required to do passthrough? 18V for shorter cable runs and 24V for longer runs?
Not feeling up to the math today... but the power supply that comes with the NS5M is 15V 0.8A - so 12Watts.
Max draw on two NS5M would be 16Watts... so a 18V to 24V power supply is basically required to do passthrough? 18V for shorter cable runs and 24V for longer runs?
lncommunications
09-17-2009, 01:06 AM
24 Volts (PSU) / 8W (Max Consumption) = 240mA (per Nano)
48 Volts (PSU) / 8W (Max Consumption) = 120mA (per Nano)***
Taking PJ's figure of 700mA max current for CAT5...
Basically if you can daisy chain the following;
24 Volts = 2 NanoM's (possibly 3 if you wanna risk it @ 3 x 240mA = 720mA)
48 Volts = 5 NanoM's (possibly 6 again @ 6 x 120mA = 720mA)***
***The 48V option is not available as I first thought, you can plug a 48v PoE injector into the cable and use a Instant802.3af adaptor BUT! obviously these devices drop the voltage down to 24V(?) and therefore the input voltage to the nano is that which leaves the adaptor. Simply put - forget about the 48V calculations
I believe that is right.
The NanoStation M's are not 802.3af. They accept a max voltage of 24V.
For the passthrough you cannot exceed 1A (etherent is limited to about 700MA.
Basically you can only daisy chain 2 NS5M off that port, or possible 3, but you are running over the capacity of the etherent cable at that point.
Thank,
Mike
Theoretical figures above, but if Mike says you can only daisy chain one I would trust the guy and accept it.
48 Volts (PSU) / 8W (Max Consumption) = 120mA (per Nano)***
Taking PJ's figure of 700mA max current for CAT5...
Basically if you can daisy chain the following;
24 Volts = 2 NanoM's (possibly 3 if you wanna risk it @ 3 x 240mA = 720mA)
48 Volts = 5 NanoM's (possibly 6 again @ 6 x 120mA = 720mA)***
***The 48V option is not available as I first thought, you can plug a 48v PoE injector into the cable and use a Instant802.3af adaptor BUT! obviously these devices drop the voltage down to 24V(?) and therefore the input voltage to the nano is that which leaves the adaptor. Simply put - forget about the 48V calculations
I believe that is right.
The NanoStation M's are not 802.3af. They accept a max voltage of 24V.
For the passthrough you cannot exceed 1A (etherent is limited to about 700MA.
Basically you can only daisy chain 2 NS5M off that port, or possible 3, but you are running over the capacity of the etherent cable at that point.
Thank,
Mike
Theoretical figures above, but if Mike says you can only daisy chain one I would trust the guy and accept it.
kijoma
09-19-2009, 09:28 AM
hi,
its not just the cable, think of the wipe contacts in the primary ethernet port.. the RJ45 is a data plug.. it has little surface contact area to support high currents.
Tranzeo did the two port idea some years ago and it was real easy to fry the PoE passthrough (they did track it using thin tracks on the PCB tho!) :icon_biggrin:
I like the idea for having a link and access pair though and am all for it.. if you need more current handling then break out the blue/brown pairs from the main feed cable and link them across to the last nano5m so you form a "power ring"..
then the power comes in from two directions, half the load on contacts etc... in theory, if you don't mind the main cat5 potentially warming a bit , you could hook up 3-4 cascadable units this way..
its not just the cable, think of the wipe contacts in the primary ethernet port.. the RJ45 is a data plug.. it has little surface contact area to support high currents.
Tranzeo did the two port idea some years ago and it was real easy to fry the PoE passthrough (they did track it using thin tracks on the PCB tho!) :icon_biggrin:
I like the idea for having a link and access pair though and am all for it.. if you need more current handling then break out the blue/brown pairs from the main feed cable and link them across to the last nano5m so you form a "power ring"..
then the power comes in from two directions, half the load on contacts etc... in theory, if you don't mind the main cat5 potentially warming a bit , you could hook up 3-4 cascadable units this way..
Dave-D
09-19-2009, 10:14 AM
That 802.3af adapter has uses, but it will only
power one or two devices at the most. It's
rated at 16V @ 0.8A output, or 12W. That
means it's at its limit driving two Rockets.
You can always use a 48V supply driving two
or more adapters. Using the standard 4-wire
PoE on a CAT5 cable with standard RJ45
connectors, you can easily deliver 1A (48W).
That powers seven devices thru adapters.
If you don't like that, you can run a separate
pair of wires to deliver 48V to the cluster,
and distribute it to multiple RJ45 jacks.
For two Rockets (in cascade), you could use
a 20V 1A supply, providing 20W--enough for
three devices. Any CAT5 cable at 100M max.
length will deliver 15V to the devices.
Don't ever use a 24V power supply; most aren't
designed to assure voltage regulation. It is very
easy to exceed the 24V device maximum.
Dave
power one or two devices at the most. It's
rated at 16V @ 0.8A output, or 12W. That
means it's at its limit driving two Rockets.
You can always use a 48V supply driving two
or more adapters. Using the standard 4-wire
PoE on a CAT5 cable with standard RJ45
connectors, you can easily deliver 1A (48W).
That powers seven devices thru adapters.
If you don't like that, you can run a separate
pair of wires to deliver 48V to the cluster,
and distribute it to multiple RJ45 jacks.
For two Rockets (in cascade), you could use
a 20V 1A supply, providing 20W--enough for
three devices. Any CAT5 cable at 100M max.
length will deliver 15V to the devices.
Don't ever use a 24V power supply; most aren't
designed to assure voltage regulation. It is very
easy to exceed the 24V device maximum.
Dave
Dave-D
09-19-2009, 10:20 AM
That 802.3af adapter has uses, but it will only
power one or two devices at the most. It's
rated at 16V @ 0.8A output, or 12W. That
means it's at its limit driving two Rockets.
You can always use a 48V supply driving two
or more adapters. Using the standard 4-wire
PoE on a CAT5 cable with standard RJ45
connectors, you can easily deliver 1A (48W).
That will power 7 devices via adapters.
If you don't like that, you can run a separate
pair of wires to deliver 48V to the cluster,
and distribute it to multiple RJ45 jacks.
For two Rockets (in cascade), you could use
a 20V 1A supply, providing 20W--enough for
three devices. Any CAT5 cable at 100M max.
length will deliver 15V or higher to the devices.
Be very careful using a 24V power supply; most
aren't designed to assure voltage regulation. It
is very easy to exceed the 24V device maximum.
Dave
power one or two devices at the most. It's
rated at 16V @ 0.8A output, or 12W. That
means it's at its limit driving two Rockets.
You can always use a 48V supply driving two
or more adapters. Using the standard 4-wire
PoE on a CAT5 cable with standard RJ45
connectors, you can easily deliver 1A (48W).
That will power 7 devices via adapters.
If you don't like that, you can run a separate
pair of wires to deliver 48V to the cluster,
and distribute it to multiple RJ45 jacks.
For two Rockets (in cascade), you could use
a 20V 1A supply, providing 20W--enough for
three devices. Any CAT5 cable at 100M max.
length will deliver 15V or higher to the devices.
Be very careful using a 24V power supply; most
aren't designed to assure voltage regulation. It
is very easy to exceed the 24V device maximum.
Dave
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