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EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

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  • 1.  EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 03:38

    hi all, I have issue when powerd up EX4200, poe is configured on all ports but seems that opeational status is off, this is config: 

     

    set poe interface all
    set poe interface all telemetries
    set poe interface ge-0/0/0 disable
    set poe interface ge-0/0/1 disable
    set poe interface ge-0/0/2 disable
    set poe interface ge-0/0/10 disable
    set poe interface ge-0/0/11 disable

    output of show commands:

     

    # run show poe interface
    Interface    Admin       Oper    Max        Priority       Power          Class
                 status      status  power                     consumption
     ge-0/0/0    Disabled    Disabled 0.0W      Low            0.0W           not-applicable
     ge-0/0/1    Disabled    Disabled 0.0W      Low            0.0W           not-applicable
     ge-0/0/2    Disabled    Disabled 0.0W      Low            0.0W           not-applicable
     ge-0/0/3    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/4    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/5    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/6    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/7    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/8    Enabled     OFF     15.4W      Low            0.0W           not-applicable
     ge-0/0/9    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/10    Disabled    Disabled 0.0W      Low            0.0W           not-applicable
    ge-0/0/11    Disabled    Disabled 0.0W      Low            0.0W           not-applicable
    ge-0/0/12    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/13    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/14    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/15    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/16    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/17    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/18    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/19    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/20    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/21    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/22    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    ge-0/0/23    Enabled     OFF     15.4W      Low            0.0W           not-applicable
    
    # run show poe controller
    Controller  Maximum   Power         Guard    Management   Status        Lldp
    index       power     consumption   band                                Priority
       0**      410.00W   0.00W           0W     Static       AF_MODE       Disabled
    
    # run show poe telemetries
    Interface  Sl No    Timestamp                Power    Voltage
     ge-0/0/4     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
     ge-0/0/5     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
     ge-0/0/6     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
     ge-0/0/7     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
     ge-0/0/8     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
     ge-0/0/9     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/12     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/13     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/14     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/15     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/16     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/17     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/18     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/19     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/20     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/21     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/22     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    ge-0/0/23     1     03-13-2014 10:06:05 UTC  0.0W     51.6V
    

    any idesa why operational status is off? hoiw can I convert port to supply 24V instead 51.6V? 51.6V might be to high for APs



  • 2.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-15-2020 03:47

    Hi 

     

    The following KB article can help you do the preliminary troubleshooting in regards to POE

     

    https://kb.juniper.net/InfoCenter/index?page=content&id=KB31533&actp=search&viewlocale=en_US&IQ_SESSION_ID=0ee82b0e-60a0-43c1-a200-9ce79b3cc15e

     

    Hope this hleps



  • 3.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 03:51

    Hello Cas,

    • If the operational status shows OFF, flap the interface and check the status if the device is consuming the power or not.

    • Check for power consumption history for that particular POE interface

    The below Kb will help u further troubelshooting

    https://kb.juniper.net/InfoCenter/index?page=content&id=KB31533&cat=EX3300&actp=LIST

     

    How to configure POE in Ex Series switches 

    https://kb.juniper.net/InfoCenter/index?page=content&id=KB11239&actp=METADATA

     

     

    Hope this helps. Smiley Happy

     

    Please mark "Accept as solution" if this answers your query.  Kudos are appreciated too! 



  • 4.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-15-2020 03:59

    Hello Cas,

    Greetings!

     

    I see all the POE interfaces are in the disabled or OFF state. 

     

    Few queries:

    1. Is the switch a full PoE model or a partial PoE model?
    2. Is the cable properly seated in the port socket?
    3. Has the PoE power budget been exceeded for the switch?
    4. Does the powered device require more power than is available on the interface?

    If the telemetries option has been enabled for the interface, check the history of power consumption.

    show poe telemetries interface all count 2

     

    Provide the below output:

    >show version

     

    You can check the below documentation for more reference:

    Monitoring and Troubleshooting PoE:

    https://www.juniper.net/documentation/en_US/junos/topics/topic-map/poe-ex-series-monitoring.html

     

    Configuring Power over Ethernet:

    https://www.juniper.net/documentation/en_US/junos/topics/topic-map/security-interface-config-poe.html#id-understanding-power-over-ethernet

     

    I hope this helps. Please mark this post "Accept as solution" if this answers your query.

     

    Kudos are always appreciated! Smiley Happy

     

    Best Regards,

    Lingabasappa H


    #voltage
    #POE


  • 5.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 04:53

    thanks all, system also show to upgrade firmware under show poe controller, will upgrade and check after. 

     

    request system firmware upgrade poe fpc-slot <slot>

    Do You know how can I change 51.5V to 24V for this switch? 



  • 6.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-15-2020 05:05

    Hello Cas,

     

    Yes, you can upgrade the firmware ad check the status after that.

     

    Upgrading firmware:

    https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/request-system-firmware-upgrade.html

     

    https://www.juniper.net/documentation/en_US/junos/topics/topic-map/install-and-upgrade-firmware.html

     

    Regarding the voltage change:

     

    The Voltage field describes the Maximum voltage provided by the specified interface at the time the data was gathered. 

     

    As per my understanding, we cannot change this via CLI as this is gathered by the switch at that specific time when the command is issued.

     

    https://www.juniper.net/documentation/en_US/junos/information-products/pathway-pages/ex-series/power-over-ethernet.pdf

     

    user@switch> show poe telemetries interface all count 2
    Interface Sl No Timestamp Power Voltage
    ge-0/0/1 1 03-09-2012 11:52:03 UTC 4.2W 54.9V
             2 03-09-2012 11:47:03 UTC 4.2W 54.8V
    ge-0/0/2 1 03-09-2012 11:52:03 UTC 4.2W 54.9V
             2 03-09-2012 11:47:03 UTC 4.1W 54.8V
    ge-0/0/3 1 03-09-2012 11:52:03 UTC 4.2W 54.9V
             2 03-09-2012 11:47:03 UTC 4.3W 54.8V

     

     

    I hope this helps. Please mark this post "Accept as solution" if this answers your query.

     

    Kudos are always appreciated! Smiley Happy

     

    Best Regards,

    Lingabasappa H



  • 7.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-15-2020 06:15

    @Cas - #1 is this an EX4200-P or PX switch.  This makes a BIG difference.  P model can only supply a max of 15.4W per interface (AF-Mode/POE), while PX model can provide upto 30W (AT-Mode/POE+).

     

    I believe what you are seeing, outside of telmentry, is expected behavior.  You have set POE disabled on 5 interfaces, so those interfaces correctly show a POE Admin Status of Disabled, which then causes Operational Status to also be Disabled.

     

    All the other interfaces have POE Admin Enabled, and POE Operational Status of off, as it appears no POE device is connected to any of the interfaces, so Operational POE shows off, which is also expected.

     

    As for all showing MAX power of 15.4 watts, this is because you have set Class Management to Static and AF-Mode.  AF-mode provides for a MAX of 15.4 watts.  If this unit is a P model, this is VERY expected.

     

    I have no idea why telmentry shows 51.6V, but I suspect this is expected as well.  POE is not measured with Volts, but with watts/power. 



  • 8.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 07:06

    Hi Cas,

     

    Usually power over Ethernet is injected onto the cable at a voltage between 44 and 57 volts DC. For the device you are using it seems that the value 51.6V is the output voltage and the value that shows up there is showing a fixed value for the port which I suppose this cannot be changed. Again as my collegaues in above comments mentioned, POE is not measured with Volts, but with watts/power. 



  • 9.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 07:25

    @vishaalv wrote:

    Hi Cas,

     

    Usually power over Ethernet is injected onto the cable at a voltage between 44 and 57 volts DC. For the device you are using it seems that the value 51.6V is the output voltage and the value that shows up there is showing a fixed value for the port which I suppose this cannot be changed. Again as my collegaues in above comments mentioned, POE is not measured with Volts, but with watts/power. 


    @vishaalv if this is measured in watts, if I change default 15.4W to 7W, will output show lower valtage and will adjust valtage to the device which will connect? I am only worry that it might damage device which will have lower valtage. 



  • 10.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-15-2020 07:30

    @rccpgm wrote:

     

    I believe what you are seeing, outside of telmentry, is expected behavior.  You have set POE disabled on 5 interfaces, so those interfaces correctly show a POE Admin Status of Disabled, which then causes Operational Status to also be Disabled.

     

    All the other interfaces have POE Admin Enabled, and POE Operational Status of off, as it appears no POE device is connected to any of the interfaces, so Operational POE shows off, which is also expected.


    @rccpgm , thx, but when I connected device to ge-0/0/5, it also showed the same status. And until device is powered, interface line will not come up. 



  • 11.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-16-2020 00:40

    @rccpgm wrote:

    @Cas - #1 is this an EX4200-P or PX switch.  This makes a BIG difference.  P model can only supply a max of 15.4W per interface (AF-Mode/POE), while PX model can provide upto 30W (AT-Mode/POE+).

     


    @



  • 12.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-16-2020 04:00

    The issue is that your 24V PoE device is not 802.1af/at PoE but instead passive PoE.

     

    24V = passive PoE and is simply on or off.

    48V = 802.3af (15W PoE) and at (25W PoE+) and uses negotiation.

     

    You need to use the 24V PoE injector that came with your device--the switch cannot power it.

     

    (edited to fix 802.1af should be 802.3af)



  • 13.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-16-2020 04:37

    @smicker's responses are usually very good, but I believe this case this response is not accurate at all.

     

    #1 response required from @Cas is if this device is a really old EX4200-P or just an older EX4200-PX.



  • 14.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-16-2020 04:42

    @Cas get output of show chassis hardware and show chassis hardware model, please.



  • 15.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-16-2020 05:53

    @smicker wrote:

    The issue is that your 24V PoE device is not 802.1af/at PoE but instead passive PoE.

     

    24V = passive PoE and is simply on or off.

    48V = 802.1af (15W PoE) and at (25W PoE+) and uses negotiation.

     

    You need to use the 24V PoE injector that came with your device--the switch cannot power it.


    @smicker, hm, that is interasting, so if device has 24V and connect to EX4200 switch, juniper switch will not automatically adjust it to 24V and will put PoE operational status in off mode? So solution is to use 24V adapter? Does it look similar to this? 

     

    1.JPG



  • 16.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-16-2020 06:07

    That looks more like something to extend 24V power and ethernet to a device that doesn't support any kind of PoE. What I'm referring to is something like this;

     

    https://www.ui.com/accessories/poe-adapters/ 

     

    Can you post information about the device you are trying to power? 



  • 17.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-17-2020 01:25

    @smicker wrote:

    That looks more like something to extend 24V power and ethernet to a device that doesn't support any kind of PoE. What I'm referring to is something like this;

     

    https://www.ui.com/accessories/poe-adapters/ 

     

    Can you post information about the device you are trying to power? 


     
    in spec they wrote that those devices support 24V and passive PoE
     
     
     


  • 18.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V
    Best Answer

     
    Posted 06-17-2020 02:19

    Thanks, this confirms that your device is a non-802.3 poe 24V device and requires the passive poe injector that should come with the antenna.

     

    From the datasheet at https://dl.ubnt.com/datasheets/rocketm/RocketM_DS.pdf 

    poe.png

     

     

     

    Here is some additional info:

    https://community.ui.com/questions/Powering-Rocket-M5-GPS-with-PoE-Switch/cb9ddc1d-987b-4a68-8801-87dfe863ea3d 

    https://community.ui.com/questions/POE-48v-compatibilty/6d3ac126-8691-4956-980a-2e7c687f666c



  • 19.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

     
    Posted 06-17-2020 02:27

    Your MicroTik is also passive PoE:

    poe2.png



  • 20.  RE: EX4200, PoE not working on all ports, how to set Voltage 24V instead 51.6V

    Posted 06-17-2020 05:39

    @smicker wrote:

    Thanks, this confirms that your device is a non-802.3 poe 24V device and requires the passive poe injector that should come with the antenna.

     


    @smicker looks like You are right, client confirmed that he used additional PoE panel as adapter but he was hoping to not use that after migrating from microtic to juniper. Schame he did not mentioned that before so it would save some time ;/