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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>
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