IPN-8U NETWORK SWITCHING MODULE
USER MANUAL
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2.5.5 Troubleshooting
Possible problems and their solutions are given in Table 4.
Table 4 –
Possible problems and their solutions
Problem
Possible cause
Solutions
IPN-8U indicators are
OFF
No 48 V power voltage
Check connection to the
power supply source
When turning power on
IPN-8U, some PoU indi-
cators are RED
U-interface line fault, short circuit
available
Find the cause, fix it and
replace the fuse
When turning power on
IPN-8U, PoU indicator is
RED
Fault in the power supply circuit of de-
vices connected to Ethernet ports 1 - 4
Find the cause, fix it and
replace the fuse
Indicator of one of the
ports 1 – 8 is OFF
Port is not configured. Port is not in-
volved in configuration
Make configuration
Indicator of some of the
Uk
0
ports 1 - 8 is RED
The subscriber device cable is faulty
Change the subscriber de-
vice cable
The subscriber device is faulty or not
connected to the power supply source
Check power supply circuit
of the subscriber device
When turning IPN-8U,
the CPU indicator is OFF
Program loading mode
Wait till the end of loading
Processor is not started
Turn the power OFF and
ON
Software is not loaded
IPN-8U needs repair
System error
When turning IPN-8U
indicator of secondary
power 5 V, +3 V
is RED
Secondary power supply is faulty
IPN-8U needs repair