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12 Appendix A Troubleshooting
Unmanaged PoE/PoE+ Switch
Appendix A Troubleshooting
Q1. Why is the PWR LED not lit?
The PWR LED should be lit when the power system is working normally. If the PWR LED is not lit,
check as follows:
A1: Make sure the switch is connected to the power source with the AC power cord properly.
A2: Make sure the voltage of the power supply meets the requirements of the input voltage of the
switch.
A3: Make sure the power source is on.
Q2. Why is the Link/Act LED not lit when a device is connected to the corresponding
port?
It is recommended that you check the following items:
A1: Make sure that the cable connectors are firmly plugged into the switch and the device.
A2: Make sure the connected device is turned on and working well.
A3: The cable length should be less than 100 meters (328 feet). If Extend Mode is enabled, it
should be less than 250 meters (820 feet).
Q3. Why are some ports not supplying power for PoE devices?
If total power consumption of connected PoE devices exceeds the maximum PoE power,
the system will cut off the power to ports with larger serial numbers to compensate for the
overload. Therefore, port 5–16 (for TL-SL1218P), port 9–16 (for TL-SL1218MP) and port 9–24 (for
TL-SL1226P) may not supply power for connected PoE devices.
For example, on TL-SL1218MP, port 1–7 and port 9 are consuming 30 W respectively. If an
additional PoE device with 11 W is inserted to port 8, the system will cut off the power to port 9.
Q4. What should I notice before using the PoE Auto Recovery feature?
A1: Before upgrading a connected PoE powered device (PD), disable PoE Auto Recovery to
avoid the PD’s damage.
A2: When a PD does not send data packets to the switch for a long period in certain scenarios
(e.g. an IPC in sleep mode), disable PoE Auto Recovery to avoid the PD repeatedly rebooting.
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