Multi-Tech Systems Modem Module MT3334SMI User Manual
Page 39

Chapter 3 - Class 1 Fax Commands
MT3334SMI
39
Table 3-3. Single-Page Class 1 Answer & Receive Example
Action by
Action by
Command
Respone
Local Modem
Remote PC
AT+FCLASS=1
OK
Set Class to 1
RING
Detect Ringing
Dial, send CNG
ATA
Off hook,
Send CED,
Get CED
Send V.21 carrier
Detect carrier
CONNECT
Send flags
Detect flags
Send CSI data
Receive FCS
Send FCS
CONNECT
Send flags
Send DIS data
Receive DIS
Send FCS and flags
OK
Drop carrier
AT+FRH=3
Detect carrier
Sends V.21 carrier
CONNECT
Detect flags
Send flags
Receive TSI
Send TSI frame
Receive FCS
Send FCS
OK
Accept FCS
AT+FRH=3
CONNECT
Receive DCS
Send DCS frame
Receive FCS
Send FCS
OK
Accept FCS
AT+FRH=3
NO CARRIER
Detect loss of
Drop carrier
carrier
AT+FRM=96
Wait 75 msec.
CONNECT
Detect carrier
Send V.29 carrier
Receive TCF
Send TCF data
Detect carrier loss
Drop carrier
NO CARRIER
AT+FTH=3
Send V.21 carrier
Detects carrier
CONNECT
Send flags
Detects flags
Send CFR frame
Receives CFR
Send FCS
OK
Drop carrier
AT+FRM=96
CONNECT
Detect carrier
Send V.29 carrier
Receive page
Send page data
Detect carrier loss
Drop carrier
AT+FRH=3
Wait 75 msec.
Detects carrier
Sends V.21 carrier
CONNECT
Detects flag
Sends flag
Receives EOP
Sends EOP packet
Receives FCS
Send CRC
OK
Accepts FTS
AT+FRH=3
NO CARRIER
Detects loss of
Drops carrier
carrier
AT+FTH=3
Send V.21 carrier
Detect carrier
CONNECT
Send flags
Detect flags
Send MCF frame
Receive MCF frame
Send FCS
OK
Drop carrier
AT+FRH=3
Receives carrier
Send V.21 carrier
CONNECT
Detects flags
Send flags
Receives DCN
Send DCN frame
Receives FCS
Send FCS
OK
Accepts FCS
AT+FRH=3
NO CARRIER
Detect loss of
Drops carrier
carrier
ATH0
OK
Hangs up