[cisco-voip] 3650 PoE Issue

[Ryan Huff]

You may also try increasing the poe advertisement length on the port ( power inline delay shutdown 20 initial 300 ). 


Sent from my T-Mobile 4G LTE Device

-------- Original message --------
From: "Casper, Steven" <SCASPER at mtb.com> 
Date:09/30/2015  5:18 PM  (GMT-05:00) 
To: 'Ryan Huff' <ryanhuff at outlook.com>,cisco-voip voip list <cisco-voip at puck.nether.net> 
Subject: RE: [cisco-voip] 3650 PoE Issue 

Module   Available     Used     Remaining
                     (Watts)     (Watts)    (Watts)
------   ---------   --------   ---------
1          1550.0                 141.0  1409.0
2          1550.0                    96.9      1453.1
3          1550.0                165.5   1384.5
4          1550.0               103.6    1446.4
5          1550.0                  98.9      1451.1
 
Going to try power inline auto max 15400 on the ports supporting the 7940s to see if it makes a difference when the stack reloads.
 
Steve
 
From: Ryan Huff [mailto:ryanhuff at outlook.com] 
Sent: Wednesday, September 30, 2015 10:18 AM
To: Casper, Steven; cisco-voip voip list
Subject: RE: [cisco-voip] 3650 PoE Issue
 
How much available power do you have left on the POE backplane once all phones are up and working?

 
From: SCASPER at mtb.com
To: cisco-voip at puck.nether.net
Date: Wed, 30 Sep 2015 12:33:51 +0000
Subject: [cisco-voip] 3650 PoE Issue

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:
 
7960 Telephones showed no power
No link lights on switchport
Switchport status showed UP/UP
Switchport remained in UP/UP state even after disconnecting the cable from switchport
Shut/no shut port and the telephone would reboot normally
Moving to available switchport and telephone rebooted normally
Bypassed telephone and connected PC and the PC would reboot normally reconnected telephone and the telephone would reboot normally.
 
Newer phones such as 7942 come right up.
 
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?
Switches are WS-C3650-48PD on Version 03.03.05SE.
 
Thanks!
Steve
 
 
 
 
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