Multi-Tech Systems MT5600SMI-34 - Manual (Page 99)

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
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
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
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
OK detect carrier
receive TCF
detect loss-of-carrier
wait 75 ms
send V.29 carrier
send TCF data
drop carrier
AT+FRH=3
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
NO CARRIER detect carrier
receive page
detect loss-of-carrier send V.29 carrier
send page data
drop carrier
CONNECT
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
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
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