I have a cAP ax being operated from the supplied 48v power supply. Also have a device that supports standard PoE 802.3af Mode-A, which requires only four wires of a network cable (it works fine with a TL-POE150S V3 Injector).
Is it possible to power this device from the cAP ax PoE-out port?
Re: cAP ax PoE-out to 802.3af Mode-A?
In a nutshell, it has to be seen.
The PoE out of the cap Ax is:
1) passive
2) mode B
In theory a 802.3af compliant device (PD or Powered Device) should be compatible with both Mode A and Mode B.
See:
viewtopic.php?t=145513#p716049
The 4 unused cable are not unused in a 1 GB connection anyway.
The device providing power (PSE or Power Source Equipment) can then be either mode A or mode B, the difference with passive is that the 802.3a compliant device "interrogates" the other end by "probing" it with - initially - a very low voltage and expects a reply before switching on the 48V or so power, so called PoE negotiation.
The (passive) Mikrotik has only a simpler check for resistance on the other side if auto-on:
https://help.mikrotik.com/docs/display/ROS/PoE-Out
which may (or may not) be enough in the PD to switch on the power.
You can still force it on with forced-on.
Then the PD may either "accept" the 48V or so volts or - because there has not been a previous PoE negotiation - I believe that different devices may have different implementations.
In some cases a splitter/converter and powering the device from the DC jack may be needed.
Do you need/want a 10/100 or a 1000 Mb connection between the two devices? <- if needed, splitting the power off a Mode B 10/100 connection can be a DIY job besides using common splitters (otherwise a GB splitter is needed)
Can you post the exact make/model of the powered device? <- Maybe some member have already some experience with the specific device
The PoE out of the cap Ax is:
1) passive
2) mode B
In theory a 802.3af compliant device (PD or Powered Device) should be compatible with both Mode A and Mode B.
See:
viewtopic.php?t=145513#p716049
The 4 unused cable are not unused in a 1 GB connection anyway.
The device providing power (PSE or Power Source Equipment) can then be either mode A or mode B, the difference with passive is that the 802.3a compliant device "interrogates" the other end by "probing" it with - initially - a very low voltage and expects a reply before switching on the 48V or so power, so called PoE negotiation.
The (passive) Mikrotik has only a simpler check for resistance on the other side if auto-on:
https://help.mikrotik.com/docs/display/ROS/PoE-Out
which may (or may not) be enough in the PD to switch on the power.
You can still force it on with forced-on.
Then the PD may either "accept" the 48V or so volts or - because there has not been a previous PoE negotiation - I believe that different devices may have different implementations.
In some cases a splitter/converter and powering the device from the DC jack may be needed.
Do you need/want a 10/100 or a 1000 Mb connection between the two devices? <- if needed, splitting the power off a Mode B 10/100 connection can be a DIY job besides using common splitters (otherwise a GB splitter is needed)
Can you post the exact make/model of the powered device? <- Maybe some member have already some experience with the specific device
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JohnConnett
newbie
- Posts: 35
- Joined:
Re: cAP ax PoE-out to 802.3af Mode-A?
DoorBird D1101V IP Video Door Station. The connection is via an RJ45 socket to 4-wires orange+white (T+), orange (T-), green+white (R+), green (R-). I suspect, but haven't confirmed, that these correspond with pins 1,2,3,6 and that pins 4,5,7,8 are unconnected (high resistance).Can you post the exact make/model of the powered device? <- Maybe some member have already some experience with the specific device
Rebooted the cAP ax with nothing on ether2. Attached the D1101V. No PoE entries in the log. The bell push didn't light up suggesting it doesn't have power. This from the terminal:
Code: Select all
[admin@MikroTik] /interface/ethernet/poe>
[admin@MikroTik] /interface/ethernet/poe> print detail
0 name="ether2" poe-out=auto-on poe-priority=10 poe-lldp-enabled=no power-cycle-ping-enabled=no power-cycle-interval=none
[admin@MikroTik] /interface/ethernet/poe> monitor
numbers: 0
name: ether2
poe-out: auto-on
poe-out-status: waiting-for-load
[admin@MikroTik] /interface/ethernet/poe>
Re: cAP ax PoE-out to 802.3af Mode-A?
The fact that they specify "Mode A" makes me think that the device is not fully 802.3af compliant.
And it accepts the 48V on the PoE only (normal power is an "odd" 15V).
I guess that your only way out is a splitter/injector, see:
viewtopic.php?t=188772
since the line is 10/100, the splitting amounts to taking 2 pairs out of the cable, then you need a Mode A injector and a suitable jack plug, one of these would do, or you can get two of them, GPOE-1-AB that are splitter and injector, example:
https://www.wirmax.net/en/alimentazione ... itter.html
https://shop.poetexas.com/products/gpoe-1ab
or a mode B to A converter, there is (was?) one called Gigabit PoE Mode Converter, DIGITUS DN-95130:
https://www.assmann.com/product-pdf/apl ... 5890?PL=en
but from a quick google search it seems like not in stock in many places.
The easiest/cheaper would probably be a DIY splitter and a 48V to 15V buck converter.
And it accepts the 48V on the PoE only (normal power is an "odd" 15V).
I guess that your only way out is a splitter/injector, see:
viewtopic.php?t=188772
since the line is 10/100, the splitting amounts to taking 2 pairs out of the cable, then you need a Mode A injector and a suitable jack plug, one of these would do, or you can get two of them, GPOE-1-AB that are splitter and injector, example:
https://www.wirmax.net/en/alimentazione ... itter.html
https://shop.poetexas.com/products/gpoe-1ab
or a mode B to A converter, there is (was?) one called Gigabit PoE Mode Converter, DIGITUS DN-95130:
https://www.assmann.com/product-pdf/apl ... 5890?PL=en
but from a quick google search it seems like not in stock in many places.
The easiest/cheaper would probably be a DIY splitter and a 48V to 15V buck converter.
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JohnConnett
newbie
- Posts: 35
- Joined:
Re: cAP ax PoE-out to 802.3af Mode-A?
Thanks for the help. Setting poe-out=off and using a separate 15v power supply works fine.
My longer term solution will be to use DIN rail power supplies, a (smaller) 48v for the cAP ax and a 15v for the D1101V Door Station.
My longer term solution will be to use DIN rail power supplies, a (smaller) 48v for the cAP ax and a 15v for the D1101V Door Station.
Re: cAP ax PoE-out to 802.3af Mode-A?
MikroTik documentation (https://help.mikrotik.com/docs/display/ROS/PoE-Out) states:
The datasheet of your DoorBird says:MikroTik uses RJ45 mode B pinout for power distribution
Conclusion: you can't power this device with your Mikrotik cAP AX.PoE 802.3af Mode-A, 10/100 Base-T
Re: cAP ax PoE-out to 802.3af Mode-A?
@infabo
The point remains that a PD device is either 802.3af compliant (and thus accepts both mode A and mode B) or it isn't, "802.3af Mode A" is a non-standard.
@JohnConnett
But then you will need to run a couple additional wires from the DIN rail 15V power supply to the D1101V Door Station.
The point remains that a PD device is either 802.3af compliant (and thus accepts both mode A and mode B) or it isn't, "802.3af Mode A" is a non-standard.
@JohnConnett
But then you will need to run a couple additional wires from the DIN rail 15V power supply to the D1101V Door Station.