ZyXEL Communications ES 3500 Series - Troubleshooting for Poe

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18 Troubleshooting for PoE
Before trouble shooting, you should know:
A. PD : Model info, Supported PoE standard and class, the number
B. PSE : Supported PoE standard, and the remaining power budget
Class
Current Range
(mA)
Power Range (W)
PSE Allocated Power by
Class
0
0-4
0.44-12.94
15.4
1
9-12
0.44-3.84
4
2
17-20
3.84-6.49
7
3
26-30
6.49-12.95
15.4
4
36-44
12.95-25.50
30
C. Cable: type and length
i. Make sure that the Ethernet cable length does not exceed 100 meters.
ii. If PD does not power-on, try swapping the Ethernet cable with a cable that
has no issues powering-on different PDs.
D. Use the latest firmware for the Zyxel switch.
Flowchart:
Check syslog
a. PoE Overload Event: The PD requested more power than the configured max
power on the specific port while in consumption mode.
b. PoE Power Management Event: The overall consumed power exceeded the
total power budget.