8
Appendix B: Troubleshooting
1. The device connected to POE-151S cannot be powered?
Answer:
a. Please check the POE-151S is connect with an IEEE 
802.3af complied in-line device like POE-150, and check 
if the POE LED indicator at POE-151S is steady blink 
once attach to the IEEE 802.3af in-line power device. 
Then connect the DC plug cable to the device you would 
like to power on.
b. Please check the cable type of the connection from one 
end to the other end. The cable should be an 8-wire UTP, 
Category 5 or above, EIA568 cable within 100 meters. A 
cable with only 4-wire, short loop or over 100 meters, all 
will affect the power supply.
c. Please check the power requirement of the device you 
would like to power and check the label of the POE-151S 
if it meets the requirement. There are three models of 
POE-151S for different power output, DC 5V, DC 9 V and 
DC 12V.
d. Please check the specification of the powered device. If 
the device is over the specification of POE-151S, the LED 
indicator of POE-151S will blink instead of stead green. 
The maximum currents that POE-151S can supply are: 
2A (5V DC), 1.3A (9V DC) and 1A (12V DC).
2. The device can only work at 100Mbps through it is connected to 
Gigabit Ethernet device?
Answer:
POE-151S will use 4-wire for data transmission (pair 1, 
2, pair 3, 6) and 4-wire for power supply (pair 4, 5, pair 
7, 8), thus Gigabit Ethernet device connect to POE-151S 
will not send data over the power wire and the transmit 
speed shall change to 100Mbps.