Troubleshooting the SWAN Concentrator and WAN Subsystem

Understanding the SWAN Concentrator LEDs
The activity of the LEDs on the ServerNet wide area network (SWAN) concentrator's front
panel have meaning while the power-on self-test (POST) is executing. The following table
describes the meanings of these LEDs.
Label Color Meaning
POWER
Green
The power LED is on when the power is on, and off when the power is
off.
If the power LED does not come on, the SWAN concentrator should be
replaced.
FAN Amber The fan LED is on when the fan stops turning, and off when the fan is
turning.
If the fan LED goes off, the SWAN concentrator might overheat. If you
discover that the LED is not operational, the SWAN concentrator
should be replaced.
FAULT
Amber
There are three fault LEDs, one for each CLIP. The fault LED flashes
during the POST and goes off when the POST successfully finishes. If
the fault LED goes to solid, one or more of the POST tests failed or
never started.
If all three fault LEDs stay on solid, or if any of the three fault LEDs
continues flashing, the SWAN concentrator should be replaced.
LINK
Green
There are two link LEDs, one for each Ethernet port. The link LEDs are
on when the SWAN concentrator is receiving link-integrity pulses from
the remote port and off when there is no link integrity between the
SWAN concentrator and the Ethernet port.
You should verify link integrity at both the local and remote Ethernet
ports. Loss of link integrity can indicate a bad cable.
COL
Green
There are two collision LEDs, one for each Ethernet port. The collision
LEDs are flashing when a collision occurs and off when there are no
collisions.
Collisions are normal. They are not a problem unless they reach an
excessive level. Determining what is an excessive level is site-specific.
TX
Green
There are two transmit LEDs, one for each Ethernet port. The transmit
LEDs are flashing when the SWAN concentrator is transmitting data
and off when it is not.
RX
Green
There are two receive LEDs, one for each Ethernet port. The receive
LEDs are flashing when the SWAN concentrator is receiving data and
off when it is not.