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Picture 7. Location of Jumpers on a Board of a Switch
J4 jumpers block is responsible for feeding. Two upper jumpers (when installed) enable P1 port feeding, two middle
ones enable P2 port feeding, and two lower ones enable P0 port feeding.
J6 jumper (when installed) decreases a lower limit of a voltage range of P3 port to 5 V (when J6 is not installed, a
voltage on P3 should be in a range 42 – 60 V). This helps to feed a device even with a long cable with a big voltage
drop. Installing of a jumper J6 disables a function of auto determination, which is used by PSE devices to determine
a presence of PoE consumers (PD devices). Thus PSE devices will feed NP-SM4, which has a jumper J6 installed. J6
jumper is not included into a shipping kit.
Jumpers are installed horizontally. Improper installation of jumpers can damage a switch. An example of a proper
installation of jumpers for feeding P2 port is shown at the picture 8.
Picture 8. Proper Installation of Jumpers
Important! A board of switch is under 48 V voltage, which is dangerous for a life. To avoid an electric shock, always
turn off a power supply of a switch before removing its lid.A switch operation with an opened lid is not allowed.
Important! Do not turn on feeding of ports, where an equipment, which does not support PoE, can be connected.
To feed a certain port of a switch, it is a necessary to fulfill the following:
•
Turn off power supply of NP-SM4 switch;
•
Remove a lid of a switch, using an end screwdriver. To do this, there are grooves near P3 and P2 ports;
•
Install/remove jumpers;
[ENG] NetPing NP-SM4, User guide -[SM4] PoE Technology in NP-SM4 Switches
[SM4] PoE Technology in NP-SM4 Switches
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