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204 Troubleshooting
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Table 22. Fax abbreviations
Abbreviation Function Signal format (“X”= any #)
CED Called station identification 2100 Hz
CFR Confirmation to receive X010 0001 1850 or 1650 Hz for
3 seconds
CIG Calling subscriber identification 1000 0010
CNG Calling tone 1100 Hz for 500 ms
CRP Command repeat X101 1000
CSI Called subscriber identification 0000 0010
CTC Continue to correct X100 1000
CTR Response to continue to correct X010 0011
DBM -dBM signal strength detected from sending station
(number is deviation from average value)
Range in -10 to -43 (-43 is a
weak signal; see explanation
below Figure 85, Example of a
successfully received fax)
DCN Disconnect X101 1111
DCS Digital command signal X100 0001
DIS Digital identification signal 0000 0001
DTC Digital transmit command 1000 0001
DOM End of message X111 0001 1100 Hz
EOP End of procedure X111 0100
EOR End of retransmission X111 0011
EQM Eye quality monitor—a measure of the modem signal
quality, lower numbers indicate better signals
0-99
ERR Response for end of retransmission X011 1000
ECD Facsimile coded date 0110 0000
FCF Facsimile
FCS Frame check sequence
FDM File diagnostics message X011 1111
FIF Facsimile information field
FSK Frequency shift key. Low-speed command identifier
separating commands/scans; precedes command
mode.
FTT Failure to train. The 1.5 seconds of the Training Check
Frame (TCF) indicates line conditions are not good
enough for this modulation.
X010 0010
GC Group command 1300 Hz for 1.5 to 100 seconds
2100 Hz for 1.5 to 100 seconds
GI Group identification 1650 or 1850 Hz
HDLC High-level data link control
LCS Line conditioning signals 1100 Hz