Telenetics 56 - Manual (Page 161)

AT Commands
Page 153
NO CARRIER carrier
CONNECT
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
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
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