We have recently deployed 72 Cisco Wireless Access Points (AIR-CAP1602I-E-K9), managed by a pair of Cisco 5508 Wireless LAN Controllers (SW Version (126.96.36.199). Everything was working fine until a few days ago when one access point went down and subsequently refused to power up using PoE. Prior to this, it appeared to be working OK.
However, when I use an external power supply for the WAP, it works fine. This isn't really an option for us as our solution called for purely PoE.
I have tested all cable runs between the WAP and network switch (C3560E-UNIVERSALK9-M), Version 12.2(46)SE) and they appear fine.
I also used the 'test cable tdr interface' command and got the following outputs when the external power supply was connected (WAP booted OK):
Interface Speed Local pair Pair length Remote pair Pair status
When deployed using PoE, the power drawn from the power sourcing equipment will be higher by some amount dependent on the length of the interconnecting cable. This additional power may be as high as 2.45W, bringing the total system power draw (access point + cabling) to 15.4W.
Thank you very much for your input. Originally the overall cable length from WAP to switch was 32-33 metres. To minimise disruption to our users I replaced the offending WAP as soon as I was aware there was an issue.
The output from the TDR test in my original post was using a 2 metre patch cable which I tested with a Fluke Cable Tester to ensure its reliability.
The company that installed the wireless network will be replacing the WAP shortly as it is still under warranty. I was just hoping to gain a little better understanding to this problem and how to address it should the same situation occur again.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
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The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
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