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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
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