AT Command Reference Manual
5-8
1048
Table 5-3. Fax Class 1 Answering Sequence (One Page)
DTE Commands
DCE Responses
(Host)
(Modem)
Remote Fax
Notes
(1)
AT+FCLASS=1
(2)
OK
Set to Class 1
PHASE A
(3)
FAX machine dials
(4)
RING
(5)
ATA
(6)
Modem answers
(7)
Send HDLC flags
(8)
Receive flags
+FTH=3 implied by
answering
(9)
CONNECT
PHASE B
(10) <NSF>
(11) Send NSF frame
(12) Receive NSF
Last frame bit = 0
(13) CONNECT
(14) <CSI>
(15) Send CSI frame
(16) Receive CSI
Last frame bit = 0
(17) CONNECT
(18) <DIS>
(19) Send DIS frame
(20) Receive DIS
Last frame bit = 1
(21) OK, drop carrier
(22) AT+FRH=3
(23) CONNECT
(24) Send TSI frame
Last frame bit = 0
(25) <TSI>, OK
(26) AT+FRH=3
(27) CONNECT
(28) Send DCS frame
Last frame bit = 1
(29) <DCS>, OK
(30) Drop Carrier
(31) AT+FRM=96
(32) Send V.29
(33) CONNECT
(34) Send TCF frame
(35) <TCF>
(36) Drop carrier
(37) NO CARRIER
(38) AT+FTH=3
(39) CONNECT
(40) <CFR>
(41) Send CFR frame
(42) Receive CFR
Last frame bit = 1
(43) OK, drop carrier
PHASE C
(44) AT+FRM=96
(45) Send page data
(46) <page data>
(47) Drop carrier
(48) NO CARRIER
PHASE D
(49) AT+FRH=3
(50) CONNECT
(51) Send EOP frame
Last frame bit = 1
(52) <EOP>, OK
(53) AT+FTH=3
(54) CONNECT
(55) <MCF>
(56) Send MCF frame
(57) Receive MCF
Last frame bit = 1
(58) OK, drop carrier
(59) AT+FRH=3
(60) CONNECT
(61) Send DCN frame
Last frame bit = 1
(62) <DCN>, OK
PHASE E
(73) ATH0
(74) OK, hang up
(75) Hang up
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