Often, when the batteries are discharging, or simply when a power surge occurs, the swith disables the POE of 48V ports.
This usually make the up-link backhaul to go off, so the site is no longer reachable!!!
Obviously this is a great problem for us.
Is there a way to prevent the switch to disable POE in 48V ports?
Thanks
How to prevent the disabling of 48V ports?
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sirhc - Employee
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Re: How to prevent the disabling of 48V ports?
What model switch are you using?
What firmware version are you using?
What is the voltage level of the "surge"?
How long does the surge last?
When the surge passes does the switch turn the 48V ports back on by itself?
What firmware version are you using?
What is the voltage level of the "surge"?
How long does the surge last?
When the surge passes does the switch turn the 48V ports back on by itself?
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giannici - Member
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Re: How to prevent the disabling of 48V ports?
I think this happens with no specific model or release, we experienced this since a lot of time. Anyway, last times it happened with two different WS-12-DC (Rev E), firmware 1.4.6 and 1.3.9.
For the moment let's ignore the "surge" question, I'm not sure of it. For sure it happens when input voltage goes low. I have seen a log saying that voltage was low so the 48 V ports were disabled (I don't have the exact text of the log).
The very bad thing is that this new setting (with ports disabled) is SAVED into memory, so when the switch restart (power returns) the ports remain off and the backhauls cannot start and the tower remains isolated!!!
How can I prevent this from happen?
For the moment let's ignore the "surge" question, I'm not sure of it. For sure it happens when input voltage goes low. I have seen a log saying that voltage was low so the 48 V ports were disabled (I don't have the exact text of the log).
The very bad thing is that this new setting (with ports disabled) is SAVED into memory, so when the switch restart (power returns) the ports remain off and the backhauls cannot start and the tower remains isolated!!!
How can I prevent this from happen?
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sirhc - Employee
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Re: How to prevent the disabling of 48V ports?
giannici wrote:I think this happens with no specific model or release
No this does not happen on any other model.
The WS-12-DC is designed to hook to a 48V-53V power supply and get conditioned power not direct to batteries, it states this in the spec sheet and the product description on the web site.
What you want is the WS-12-250-DC or WS-8-150-DC which will accept 9V to 72V DC input and always power 24V and 48V devices as it conditions the power itself.
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giannici - Member
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Re: How to prevent the disabling of 48V ports?
sirhc wrote:giannici wrote:I think this happens with no specific model or release
What you want is the WS-12-250-DC or WS-8-150-DC which will accept 9V to 72V DC input and always power 24V and 48V devices as it conditions the power itself.
No, what I want is that, if voltage is not sufficient for 48V, the 48V Ports are taken down, BUT when volts returns sufficient (maybe with a margin) those ports SHOULD BE TAKEN ON AGAIN, AS THEY WHERE BEFORE!
For sure, the switch should NOT autonomously change my configuration and SAVE it for the next restart. If I save a configuration, than it means that I WANT THAT ONE!
In some situation I CANNOT ALLOW that 48V Ports are taken down forever, because they power the uplink, otherwise that tower remains isolated!!!
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giannici - Member
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Re: How to prevent the disabling of 48V ports?
Today it happened again!
This time, after we removed the power to a WS-12-DC, then when we re-powered it, the Port 2 had no more the 48V power.
This was the log:
Please, give us a way to disable this "smart" behavior that changes our configuration.
Thanks.
This time, after we removed the power to a WS-12-DC, then when we re-powered it, the Port 2 had no more the 48V power.
This was the log:
- Code: Select all
Jan 1 01:00:06 netonix: 1.4.5 on WS-12-DC
Jan 1 01:00:10 system: Setting MAC address from flash configuration: EC:13:B2:A1:00:2A
Jan 1 01:00:11 system: starting ntpclient
Jan 1 01:00:13 root: adding lan (eth0) to firewall zone lan
Jan 1 01:00:23 main: packet_rx_filter_change NOT IMPLEMENTED
Jan 1 01:00:25 dropbear[826]: Running in background
Jan 1 01:00:27 switch[853]: Detected cold boot
Jan 1 01:00:28 switch[853]: PoE enabled on port 1, PoE Smart is starting cable check
Jan 1 01:00:28 switch[853]: PoE enabled on port 3, PoE Smart is starting cable check
Jan 1 01:00:29 switch[853]: PoE enabled on port 4, PoE Smart is starting cable check
Jan 1 01:00:29 switch[853]: PoE enabled on port 5, PoE Smart is starting cable check
Jan 1 01:00:29 switch[853]: PoE enabled on port 6, PoE Smart is starting cable check
Jan 1 01:00:29 switch[853]: Port 2: Input Voltage too low for 48V operation (-1.0V), disabling PoE
Jan 1 01:00:29 system: starting ntpclient
Please, give us a way to disable this "smart" behavior that changes our configuration.
Thanks.
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sirhc - Employee
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Re: How to prevent the disabling of 48V ports?
You do realize this was done on purpose in the firmware, it is not a bug.
As the WS-12-DC was designed to be powered by a conditioned 48V to 53V power "supply" not attached to batteries directly. Our WS-12-250-DC and WS-8-150-DC were designed to hook to batteries directly and condition the power.
There is no hidden command we can provide you with to change this behavior it will require software changes to be made to the firmware.
The reason we did this is because if your batteries drop below the cut off level of say 43V and we turn off 48V POE devices to prevent damage to them the battery voltage will jump up as soon as we turn off 48V POE and thus the switch will then turn them back on and the voltage drops again below 43V and turns the 48V POE off again and again the voltage jumps up above the 43V and we turn the 48V POE back on.
This creates a loop.
Once again the WS-12-DC was never designed to hook to batteries directly, this is what the WS-12-250-DC and WS-8-150-DC were designed for.
However I will discuss this with the software engineer (Eric) and see what we can do for the next firmware version.
As the WS-12-DC was designed to be powered by a conditioned 48V to 53V power "supply" not attached to batteries directly. Our WS-12-250-DC and WS-8-150-DC were designed to hook to batteries directly and condition the power.
There is no hidden command we can provide you with to change this behavior it will require software changes to be made to the firmware.
The reason we did this is because if your batteries drop below the cut off level of say 43V and we turn off 48V POE devices to prevent damage to them the battery voltage will jump up as soon as we turn off 48V POE and thus the switch will then turn them back on and the voltage drops again below 43V and turns the 48V POE off again and again the voltage jumps up above the 43V and we turn the 48V POE back on.
This creates a loop.
Once again the WS-12-DC was never designed to hook to batteries directly, this is what the WS-12-250-DC and WS-8-150-DC were designed for.
However I will discuss this with the software engineer (Eric) and see what we can do for the next firmware version.
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giannici - Member
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Re: How to prevent the disabling of 48V ports?
sirhc wrote:You do realize this was done on purpose in the firmware, it is not a bug.
As the WS-12-DC was designed to be powered by a conditioned 48V to 53V power "supply" not attached to batteries directly. Our WS-12-250-DC and WS-8-150-DC were designed to hook to batteries directly and condition the power.
There is no hidden command we can provide you with to change this behavior it will require software changes to be made to the firmware.
The reason we did this is because if your batteries drop below the cut off level of say 43V and we turn off 48V POE devices to prevent damage to them the battery voltage will jump up as soon as we turn off 48V POE and thus the switch will then turn them back on and the voltage drops again below 43V and turns the 48V POE off again and again the voltage jumps up above the 43V and we turn the 48V POE back on.
This creates a loop.
OK, in fact I suggested to add a "margin" for the return of 48V.
Anyway, this last time I just described was not a case of real "low voltage" but a "fluctuation of voltage". This already happened to us in other cases, for example during thunderstorms.
An important point is to DO NOT save to FLASH this changes in port settings, so that after a reboot everything can return as we saved it the last time.
sirhc wrote:Once again the WS-12-DC was never designed to hook to batteries directly, this is what the WS-12-250-DC and WS-8-150-DC were designed for.
However I will discuss this with the software engineer (Eric) and see what we can do for the next firmware version.
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sirhc - Employee
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Re: How to prevent the disabling of 48V ports?
Yes, I was thinking of a margin.
Say cut off is 43V and turn up is 48V.
So if the power drops below 43V it turns off 48V POE but does not save to config.
When power returns to 47V or more it turns 48V POE back on.
As far as the blip you are referring to I can ask Eric to sample the input voltage and use a rolling average over 3 readings or 3 seconds. This would prevent a momentary blip.
But once again I want to stress this is not what this switch is designed for. It has no real capacity to deal with voltage blips like a power supply provides so weird things can happen to the switch from power blips.
The WS-12-DC expects 48V "CONDITIONED" power from a power supply.
This is like you purchasing a volkswagen Beetle and complaining that is performs terrible in off road conditions.
You really want our WS-12-250-DC for this application.
Say cut off is 43V and turn up is 48V.
So if the power drops below 43V it turns off 48V POE but does not save to config.
When power returns to 47V or more it turns 48V POE back on.
As far as the blip you are referring to I can ask Eric to sample the input voltage and use a rolling average over 3 readings or 3 seconds. This would prevent a momentary blip.
But once again I want to stress this is not what this switch is designed for. It has no real capacity to deal with voltage blips like a power supply provides so weird things can happen to the switch from power blips.
The WS-12-DC expects 48V "CONDITIONED" power from a power supply.
This is like you purchasing a volkswagen Beetle and complaining that is performs terrible in off road conditions.
You really want our WS-12-250-DC for this application.
Support is handled on the Forums not in Emails and PMs.
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giannici - Member
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Re: How to prevent the disabling of 48V ports?
sirhc wrote:Yes, I was thinking of a margin.
Say cut off is 43V and turn up is 48V.
So if the power drops below 43V it turns off 48V POE but does not save to config.
When power returns to 47V or more it turns 48V POE back on.
As far as the blip you are referring to I can ask Eric to sample the input voltage and use a rolling average over 3 readings or 3 seconds. This would prevent a momentary blip.
I think all this changes will solve our problems.
And if the cut off/on values were user settable it will be PERFECT...
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