Code
Meaning
Suggested Cause/Action
0-23
Too many errors during reception
1. Check line connection.
(G3 mode)
2. Check connectors from FCU to modem and NCU.
3. Replace the NCU, FCU, or modem.
4. Defective remote terminal.
5. Check for line problems.
6. Ask the other end to adjust their tx level.
0-50
CFR/MCF (1650 Hz) not received at
1. Check line connection.
the correct time (G2 mode)
2. Check connectors from FCU to modem and NCU.
3. Replace the NCU, FCU, or modem.
4. Check for line problems.
5. Incompatible remote terminal.
6. Adjust the tx level (use bit switch 3 or a dedicated tx
parameter)
0-51
CFR/MCF (1650 Hz) carrier not
1. Check connectors from FCU to modem and NCU.
dropped for 6 s or more (G2 mode)
2. Replace the NCU, FCU, or modem.
3. Check for line problems.
4. Check the other terminal’s CFR/MCF turn-off timing on an
oscilloscope.
5. Incompatible or defective remote terminal.
0-52
Polarity change occurred, or PIS 1. Check connectors from FCU to modem and NCU.
was detected but the user did not
2. Replace FCU or buzzer if the user call tone is not working.
respond (G3 or G2 mode)
3. Defective Stop key.
5-18
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