Telenetics 56 - Manual (Page 161)

AT Commands
Page 153
NO CARRIER 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
AT+FRH=3 NO CARRIER detect loss-of-carrier drop carrier end of session
ATH0 OK hang up