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Chapter 4 • DW4020 LEDs and troubleshooting
60
1031484-0001 Revision 2
LED blinking indicating
status codes
The DW4020 modems’ READY LEDs can blink in various
patterns. These patterns correlate to the status codes discussed in
Transmit Status messages on page 37 and Receive Status
messages on page 42. If you can see the patterns, you also have
access to the
User Interface. It will be easier to find out what the
status of the DW4020 is via the interface than the LED status
blinking. The blink patterns are described below for your
information.
Transmit
READY LED
Pattern
Corresponding transmit status messages
Off 4 (or powered off)
On 8
2 Long,
1 Short
1
2 Long,
2 Short
2
2 Long,
3 Short
11
1 Long,
1 Short
3
1 Short 5
2 Short 10, 13, 14, 15,16, 21, 22, 23
3 Short 6, 7
4 Short 12, 17
Slow
Alternating
9,18,19,20
Fast
Alternating
The ITU interface testing – This is a continuous fast blinking pattern, with the Transmit LED being the
inverse of the Ready LED. No corresponding message.