Table 4-4. Fax Class 1 Calling Sequence (Transmitting A Single Page) - Conexant H08-15355F Reference Manual

DTE Commands
AT+FCLASS=1
ATDT<string>
AT+FRH=3
AT+FRH=3
AT+FRH=3
AT+FRH=3
<TSI frame data>
<DLE><ETX>
<DCS frame data>
<DLE><ETX>
AT+FTS=8;
+FTM=96
<TCF data pattern>
<DLE><ETX>
AT+FRH=3
AT+FRH=3
AT+FTM=96
<page image data>
<DLE><ETX>
AT+FTS=8;
+FRH=3
<EOP frame data>
<DLE><ETX>
AT+FRH=3
AT+FRH=3
AT+FRH=3
<DNC frame>
<DLE><ETX>
ATH0
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Command Reference Manual

Table 4-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)

Modem Responses
OK
CONNECT
<NSF frame>
<DLE><ETX>
OK
CONNECT
<CFI frame data>
<DLE><ETX>
OK
CONNECT
<DIS frame data>
<DLE><ETX>
OK
NO CARRIER
CONNECT
CONNECT
OK
CONNECT
OK
CONNECT
<CFR frame data>
<DLE><ETX>
OK
NO CARRIER
CONNECT
OK
CONNECT
OK
CONNECT
<MCF frame data>
<DLE><ETX>
OK
NO CARRIER
CONNECT
OK
OK
Local Modem Action
Set Class 1
Dial and send CNG
Look for V.21
Detect flags
Detect flags
get CSI
get FCS
accept FCS
Detect flags
get DIS
get FCS
accept FCS
detect loss-of-carrier
send V.21 carrier
send flags
send TSI frame
send FCS
send flags
send DCS frame
send FCS, flags
drop carrier
wait 80 ms
send V.29 carrier
send TCF data
drop carrier
detect carrier
detect flags
get CFR frame
check FCS
accept FCS
detect loss-of-carrier
send V.29 carrier
send page data
drop carrier
wait 80 ms
send V.21 carrier
send flags
send EOP frame
send FCS
drop carrier
detect carrier
detect flags
get MCF frame
check FCS
accept FCS
detect loss-of-carrier
send V.21 carrier
send flags
send DNC frame
send FCS
drop carrier
hang up
Conexant
Remote Station Action
Answer
send CED, V.21
Send HDLC flags
Send NSF frame
send CSI frame
check FCS
send DIS frame
check FCS
drop carrier
detect carrier
detect flags
get TSI frame
get DCS frame
detect carrier
get TCF data
send V.21 carrier
send flags
get CRF frame
send FCS
drop carrier
detect carrier
receive page
detect carrier
detect flags
receives EOP
send V.21 carrier
send flags
get MCF frame
send FCS
drop carrier
detect carrier
detect flags
receive DC|NC
hang up
Notes
AT+FRH=3
implied by dialing with
+FCLASS=1.0
Frame status OK
DTE must detect final
frame bit to anticipate
loss of carrier
Final frame bit clear tells the
modem to expect another
frame.
Final frame bit set tells the
modem not to expect another
frame
Final frame bit set.
frame OK
final frame
Final frame bit set.
frame OK
final frame
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