Korenix JetNet 4500 Series, User Manual

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Korenix JetNet Series Industrial Managed Ethernet Rail Switch User’s Manual 4-3
from a speed mismatch between the switch ports and the connected devices.
LED Indicators
JetNets can also be visually monitored via its own front-panel LED indicators. This can be useful
to assist in identifying common problems and to help you find possible solutions.
Check the redundant PWR1 and PWR2 LED’s to verify DC power. The PWR LED will light for
any connected power (PWR1, PWR2, or DC-IN).
Check PWR for power via an AC adapter connected to DC-IN. If the power LED indicator does
not light when the power cord is plugged in, you might have a problem with the power outlet, or
the power cord. If the switch simply powers OFF on its own after running for a period of time,
check for loose power connections, power losses, or surges at the power outlet. You should also
verify that your supply voltage remains within the required 12-48VDC range while under load.
Refer to the port Link LED (LNK) to verify that a connection has been properly established (solid
green). A blinking green LNK LED indicates communication activity. If the LNK LED remains off
after making a connection, then no device has been detected and the cable may be bad or the
connected device may be un-powered.
Refer to the Collision LED (COL) to monitor for excessive collisions. A blinking COL LED
indicates that collisions have occurred. This LED will be solid ON for a full duplex connection, as
collisions cannot occur for full-duplex. A full-duplex connection can be achieved by simply
connecting one device per switch port, and this is the most deterministic mode of operation.