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EX4200-48P with dual PSU - about 240W power consumption ?

  • 1.  EX4200-48P with dual PSU - about 240W power consumption ?

    Posted 08-16-2019 11:33

    Hello,

     

    I've got a refurbished EX4200-48P switch, see config below. When I plug the only PSU, the power consumption on wattmeter is about 140W, when I plug the second one, the load goes up almost twice (about 240W). Is it normal behavior? Nothing is plugged in and PoE is disabled on all ports. What if I would put a 320W PSUs inside, could the power consuption be lower? I do NOT need PoE.

     

    Thank you.

     

    admin@ex4200> show chassis hardware
    Hardware inventory:
    Item             Version  Part number  Serial number     Description
    Chassis                                BQ0210090238      EX4200-48P
    Routing Engine 0 REV 24   750-021255   BQ0210090238      EX4200-48P, 48 POE
    FPC 0            REV 24   750-021255   BQ0210090238      EX4200-48P, 48 POE
      CPU                     BUILTIN      BUILTIN           FPC CPU
      PIC 0                   BUILTIN      BUILTIN           48x 10/100/1000 Base-T
      PIC 1          REV 07   711-026017   CH0214300379      2x 10GE SFP+
    Power Supply 0   REV 03   740-020959   AV0810080623      PS 930W AC
    Power Supply 1   REV 03   740-020959   AV0810080643      PS 930W AC
    Fan Tray                                                 Fan Tray
    

     



  • 2.  RE: EX4200-48P with dual PSU - about 240W power consumption ?

     
    Posted 08-19-2019 06:37

    PoE Power Budget is already reserved even if you disable PoE.

    https://www.juniper.net/documentation/en_US/release-independent/junos/topics/topic-map/ex4200-power-system.html

     

    Table 1: Power Supply Rating and PoE Power Budget for EX4200 Switch Models

    Switch Model Number

    Number of PoE-enabled Ports

    Power Supply Rating

    PoE Power Budget

    EX4200-24T

    8

    320 W

    130 W

    EX4200-48T

    8

    320 W

    130 W

    EX4200-48T-S

    8

    320 W

    130 W

    EX4200-24P

    24

    600 W

    410 W

    EX4200-48P

    48

    930 W

    740 W

    EX4200-24PX

    24

    930 W

    740 W

    EX4200-48PX

    48

    930 W

    740 W



  • 3.  RE: EX4200-48P with dual PSU - about 240W power consumption ?

    Posted 09-13-2019 02:59

    In dual PSU setup, we have exchanged 2x EX-PWR-930-AC for 2xEX-PWR-320-AC and total power saving is about 100W per switch. It probably has something to do with PSU efficiency (5% of 930W = 45W) * 2



  • 4.  RE: EX4200-48P with dual PSU - about 240W power consumption ?

     
    Posted 09-13-2019 03:09

    Hi

     

    The power consumption will depend on the number of PoE ports that you are using.

    By default 15.4W is the maximum power per PoE ports. So if you are not using a lot of PoE ports then you can use 2xEX-PWR-320-AC.

    You can get the clarification of power budget from below link

     

    https://www.juniper.net/documentation/en_US/release-independent/junos/topics/topic-map/ex4200-power-system.html

     

    Hope this helps.

     

    Regards