HP 3150 manual Fax phase sequence, Sequence Calling station Called station

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
4			Transmit NSF
5			Transmit CSI
6			Transmit DIS
7	DIS detected
	Phase B—Pre-message procedure (negotiate compatible format/protocol)
8	Transmit 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

202 Troubleshooting EN