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  • PoE switch fully loaded???

    Has anybody had issues with PoE switches being fully loaded with ShoreTel phones? Something along the lines of certain phones rebooting randomly?

    I haven't loaded a Dell PoE to full capacity, but we have loaded some Cisco 500's, and we have a few phones that just reboot. replaced the phone, and it continues.

  • #2
    What model switch? We have fully loaded Netgear, HP and Cisco switches with no problems.

    You have to remember that ST phones draw less than half of the 7.5 watts of the POE standard I have no idea how much the Cisco Phones draw.

    Most switchs will tell you how much power they are use when you connect to them.
    There are 10 types of people in the world, those that understand binary and those that donít.

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    • #3
      We had a similar problem in one of our distributed closets (running Cisco POE 3560 switches). It turned out the UPS connected to them was not adequately rated, replaced it with a proper UPS and the problem has not happened since.

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      • #4
        I also experience this problem where there was random rebooting of phones. turns out that the PoE switch output was maxed out by the phones. its definitely a concern if you have more phones than the recommended.

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        • #5
          I had this same problem with an extreme switch. I was able turn the power down on the used poe ports. Still enough power for the phones but lessened the load on the switch. I have also seen this problem on an unmanaged switch in this case i added another switch to balance the load.

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          • #6
            We use hp pro curves. I have a 2650 48 Port Full POE switch that is gull of ShoreTel phones and it runs like a champ. Every port but two have a ShoreTel phone on it and those have fiber links. it is running at half poe capacity. I just wish they had a gbit option with the same features.

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            • #7
              Rebooting Phone

              There is a thread about an adtran bug that causes that exact behavior. I assume that if Adtran could have a bug that causes that, other vendors are like to have it as well.

              I wouldn't think it would be as much an overloading issue as it would be a firmware problem. May be worth looking into.

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              • #8
                We've had Dell 3448P & 3548P's fully loaded with a mix of 230 and 560 phones without issues-

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                • #9
                  We also have several HP ProCurves fully loaded with ShoreTel phones and no issues with phones power cycling spontaneously. Constantly in service for about two years now.

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                  • #10
                    It really depends on the switch vendor. In our case we use Foundry FGS 448 switches and as shipped, they come with a single power supply which can power up to 40 POE ports, if you need to have all 48 ports powered, you need to add a second power supply. At $1100 for the power supply, ouch, but hey, it is gigabit and POE as well as layer 3. I have never seen a phone reboot when maxed out on all the ports and we have been running these switches close to 3 years now.

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