beautypg.com

Multi-Tech Systems Modem Module MT3334SMI User Manual

Page 39

background image

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