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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 99
Table 6-5. Fax Class 1 Answering Sequence (Receiving a Single Page)
DTE Commands Modem Responses Local Modem Action Remote Station Action Notes
AT+FCLASS=1 OK Set Class 1
RING<- detect ringing dials [,send CNG]
ATA
<CSI frame data>
<DLE><ETX>
<DIS frame data>
<DLE><ETX>
CONNECT
CONNECT
OK
off-hook,
send CED,
send V.21 carrier
send flags
send CSI frame
send FCS
send flags
send DIS data
send FCS and flags
drop carrier
get CED,
detect carrier
detect flags
receive CSI
get FCS
get flags
get DIS
get flags
AT+FRH=3
implied by answering
with +FCLASS=1.0.
not final frame
final frame
AT+FRH=3
CONNECT
<TSI frame data>
<DLE><ETX>
OK
detect carrier
detect flags
receive TSI
receive FCS
accept FCS
send V.21 carrier
send flags
send TSI frame
send FCS
frame OK
AT+FRH=3
CONNECT
<DCS frame data>
<DLE><ETX>
OK
receive DCS
receive FCS
accept FCS
send DCS frame
send FCS
final frame bit set
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier DTE did not check final
frame bit and issued
+FRH=3
AT+FTM=96
CONNECT
<TCF data>
<DLE><ETX>
OK
detect carrier
receive TCF
detect loss-of-carrier
wait 75 ms
send V.29 carrier
send TCF data
drop carrier
AT+FRH=3
<CFR frame data>
<DLE><ETX>
CONNECT
OK
send V.21 carrier
send flags
get CRF frame
send FCS
drop carrier
detect carrier
detect flags
receive CFR
final frame
AT+FTM=96
CONNECT
<page image data>
<DLE><ETX>
NO CARRIER
detect carrier
receive page
detect loss-of-carrier
send V.29 carrier
send page data
drop carrier
CONNECT
<EOP frame data>
<DLE><ETX>
NO CARRIER
detect carrier
detect flags
receive EOP
receive FCS
accept FCS
wait 75 ms
send V.21 carrier
send flags
send EOP frame
send FCS
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier
AT+FRH=3
<MCFame data>
<DLE><ETX>
CONNECT
OK
send V.21 carrier
send flags
get MCF frame
send FCS
accept FCS
detect carrier
detect flags
receive MCF frame
final frame
AT+FRH=3
CONNECT
<DCN frame data>
<DLE><ETX>
OK
detect carrier
detect flags
receive DCN
receive FCS
accept FCS
send V.21 carrier
send flags
send DCN frame
send FCS
frame OK
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier end of session
ATH0 OK hang up