13
Status LEDs
All of the LEDs turn on and off during the power-on self-test. After a successful
self-test, the LEDs should appear as indicated in BOLD in the Condition column below.

LED Condition Status

PWR ON RTU has power.
ALM OFF
ON
No active alarms.
An alarm condition exists.
TST OFF
ON
No active tests.
The TST LED is on during the power-on self-test and
during a test initiated by the NSP.
DSL Blinking
ON
OFF
RTU is establishing the active DSL link. The LED blinks
on and off about five times per second.
The DSL link is now active and ready to transmit and
receive data.
The DSL link has not been established.
ETHERNET ON
OFF
The Ethernet 10BaseT connection to the Ethernet hub or
PC is active.
No Ethernet 10BaseT device is detected.
Troubleshooting

LED Symptom Action

All LEDs are on. If the LEDs remain on after ten minutes, the RTU is not
functional. Contact the NSP.
ALM LED remains
on. The power-on self-test may have failed. Unplug the unit and
reapply power. If the alarm LED is still on, contact the NSP.
ALM and TST
LEDs are blinking. Firmware download may be in progress. If firmware download
is not in progress or the LEDs remain on after ten minutes,
contact the NSP.
DSL LED is off. Verify that the DSL cable is securely installed on both ends. If
the problem continues, contact the NSP.
DSL LED continues
to blink after the
power-on self-test.
The RTU is attempting to establish the DSL link or adjusting
the rate of the DSL line due to line conditions. If the DSL LED
continues to blink for more than ten minutes, contact the NSP.
DSL LED is on and
there is no data
transmission.
The DSL link has been established but there is no data
transmission. First, verify the Ethernet connection. If the
problem persists, contact the NSP.