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<body class='hmmessage'><div dir='ltr'>How much available power do you have left on the POE backplane once all phones are up and working?<br><br> <BR><div><hr id="stopSpelling">From: SCASPER@mtb.com<br>To: cisco-voip@puck.nether.net<br>Date: Wed, 30 Sep 2015 12:33:51 +0000<br>Subject: [cisco-voip] 3650 PoE Issue<br><br>
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<p class="ecxMsoNormal">Having an issue related to PoE negotiation between 3650 switches that we are beginning to deploy and older cisco phones such as 7960s and 7940s . I think these are using the pre PoE standard. Symptoms are when the stack reloads the switchports
connected to Cisco 7960 telephones come up in a hung state:</p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal">7960 Telephones showed no power</p>
<p class="ecxMsoNormal">No link lights on switchport</p>
<p class="ecxMsoNormal">Switchport status showed UP/UP </p>
<p class="ecxMsoNormal">Switchport remained in UP/UP state even after disconnecting the cable from switchport</p>
<p class="ecxMsoNormal">Shut/no shut port and the telephone would reboot normally</p>
<p class="ecxMsoNormal">Moving to available switchport and telephone rebooted normally</p>
<p class="ecxMsoNormal">Bypassed telephone and connected PC and the PC would reboot normally reconnected telephone and the telephone would reboot normally.</p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal">Newer phones such as 7942 come right up.</p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal">Once we performed a shut/no shut on all switch ports and all telephones recovered normally but still this is not normal behavior. Going to open a TAC case but wondering if anyone else has experienced this?</p>
<p class="ecxMsoNormal">Switches are WS-C3650-48PD on Version 03.03.05SE.</p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal">Thanks!</p>
<p class="ecxMsoNormal">Steve</p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal"> </p>
<p class="ecxMsoNormal"> </p>
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