Code Meaning Suggested Cause/Action
0-21
EOL signal (end-of-line) from
the other end not received
within 5 s of the previous EOL
signal
• Check the connections between the FCU, NCU, & line.
• Check for line noise or other line problems.
• Replace the NCU or FCU.
• The remote machine may be defective or may have
disconnected.
Cross reference
Maximum interval between EOLs and between ECM frames
- G3 Bit Switch 0A, bit 4
0-22
The signal from the other end
was interrupted for more than
the acceptable modem carrier
drop time (default: 200 ms)
• Check the line connection.
• Replace the NCU or FCU.
• Defective remote terminal.
• Check for line noise or other line problems.
• Try adjusting the acceptable modem carrier drop time.
Cross reference
Acceptable modem carrier drop time - G3 Switch 0A, bits
0 and 1
0-23
Too many errors during
reception
• Check the line connection.
• Replace the NCU or FCU.
• Defective remote terminal.
• Check for line noise or other line problems.
• Try asking the other end to adjust their tx level.
• Try adjusting the rx cable equalizer setting and/or rx
error criteria.
Cross reference
Rx cable equalizer - G3 Switch 07 (PSTN)
Rx error criteria - Communication Switch 02, bits 0 and 1
0-30
The other terminal did not reply
to NSS(A) in AI short protocol
mode
• Check the line connection.
• Try adjusting the tx level and/or cable equalizer
settings.
• The other terminal may not be compatible.
Cross reference
Dedicated tx parameters - Section 4
3. Troubleshooting
20
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