RC224ATL/224ATLV
6.0 Operation
EmbeddedModem Family
6.5 Call Progress
Table 6-6. Fax Class 1 Answering Sequence (1 of 2)
DTE Commands
(Host)
DCE Responses
(Modem)
Remote Fax
Notes
(1) AT+FCLASS=1
(2b) AT+FRM=?
—
(2) OK
—
—
—
Set to Class 1
24,48
OK
—
—
PHASE A
—
—
(3) FAX machine dials
—
—
—
—
(5) ATA
—
(4) RING
—
(6) Modem answers
(7) Send HDLC flags
(9) CONNECT
—
(8) Receive flags
+FTH=3 implied by answering
—
—
—
PHASE B
(10) <NSF>
(11) Send NSF frame
(13) CONNECT
(15) Send CSI frame
(17) CONNECT
(19) Send DSI frame
(21) OK, drop carrier
(23) CONNECT
—
(12) Receive NSF
Last frame bit = 0
—
—
—
(14) <CSI>
(16) Receive CSI
Last frame bit = 0
—
—
—
(18) <DSI>
(20) Receive DSI
Last frame bit = 1
—
—
—
(22) AT + FRH=3
—
—
—
(24) Send TSI frame
Last frame bit = 0
—
(25) <TSI>,OK
(27) CONNECT
—
—
—
(26) AT+FRH=3
—
(28) Send DCS frame
(30) Drop carrier
—
—
—
Last frame bit = 1
—
(29) <DCS>,OK
—
—
(31) AT+FTH=3
—
—
—
(32) Send V.27 (4800)
(34) Send TCF frame
(36) Drop carrier
—
—
—
(33) CONNECT
(35) <TCF>
—
—
—
—
(37) NO CARRIER
(39) CONNECT
(41) Send CFR frame
(43) OK, drop carrier
—
(38) AT+FRM=48
(40) <CFR>
—
—
—
Last frame bit = 1
—
(42) Receive CFR
—
D224ATLVDSC
Conexant
6-15
CONEXANT [ CONEXANT SYSTEMS, INC ]
