Troubleshooting For Poe - ZyXEL Communications ES 3500 Series Troubleshooting Manual

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
0
1
2
3
4
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.
Current Range
(mA)
0-4
9-12
17-20
26-30
36-44
Power Range (W)
0.44-12.94
0.44-3.84
3.84-6.49
6.49-12.95
12.95-25.50
www.zyxel.com
PSE Allocated Power by
Class
15.4
4
7
15.4
30
129/132