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  1. #1

    TL-SF1008P - freezes after a while

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    Hi,

    I am using a TL-SF1008 with two Axis cameras at the PoE ports. One cam uses maximum 12,8 W, the other 3,0 W max which is well below the specified power consumption. Since a few days the switch "freezes" with all LED showing a steady light on the ports used. After a power off/on the switch is usable for 30 - 90 minutes before it freezes again.

    I have put the 12,8 W camera on a seperate PoE injector with the 3,0 W cam remaining on the switch. With this configuration the switch works normal.

    Any ideas? Does the switch possibly "degrades" somehow (it's just 10 month in use)?

    Thanks
    rgds FR

  2. #2
    Members R1D2 is on a distinguished road
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    Quote Originally Posted by OmniJet View Post
    One cam uses maximum 12,8 W, the other 3,0 W max which is well below the specified power consumption.
    Could be a problem if you use a lengthy cable. The 802.3af standard assumes a power loss on cable, which yields a maximum power of 12.95 W for PDs. Add 10 to 25% power loss if using switched power supplies. So clearly 12.8 W does not fit in 802.3af power specifications. I would not connect PDs with more than 10 W to 802.3af switches.

    See https://en.wikipedia.org/wiki/Power_...implementation

  3. #3
    Thank you for your immediate answer. I didn't think of cable length, however, it is just 5 m. I'd better continue with a sep. PoE injector.


 

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