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202 Troubleshooting
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Table 20. Fax phase sequence
Sequence Calling station Called station
Phase A—Call setup sequence
1 Ring signal
2 CNG tone beep, 1100Hz 1 second
3 Transmit CED, 3 seconds, 2100 Hz
4Transmit NSF
5Transmit CSI
6Transmit DIS
7 DIS detected
Phase B—Pre-message procedure (negotiate compatible format/protocol)
8Transmit TSI
9 Transmit DCS, select mode
10 DCS detected
11 Transmit TCF/training
12 Transmit FSK
13 Training (synchronize signals), check for errors
14 Transmit CFR
15 Detect CFR
Phase C—Message transmission (page/scan transmission)
16 Transmit message (FSK, followed by date)
17 Receive message (SCAN), check for errors
18 Transmit FSK
19 At end of message, send one of the
following:
z
EOM
z
EOP
z
MPS
z
PRI-Q
z
PPS-NULL
z
PPS-MPS
z
PPS-EOM
z
PPS-EOP
z
PPS-PRI-Q
Phase D—Post-message transmission (next page/end of transmission)
20 Detect EOM, EOP, MPS, PRI-Q, PPS-NULL,
PPS-MPS, PPS-EOM, PPS-EOP, or PPS-PRI-Q
21 Transmit MCF response to confirmation signals
of post-message responses
Phase E—Call release (hangup sequence)
21 Transmit DCN
22 Station hangs up