BRC State Transitions


Transition 1 Online data state to BRC State
The remote modem must be pre-configured with $BRC=1 (or 2) to permit remote initiation of BRC. The factory (&F) default is $BRC=0 to disable remote initiation of BRC.
The local user uses one of the following methods to initiate transition into the BRC state:
The host user performs a local escape and enters the AT$GETBRC command. or;
from the online data state, the user enters the Remote Escape Sequence.

If successful the remote modem completes any remote (target) user AT commands in progress, issues a ENTERING BRC message to both the local and remote users, switches to BRC state and is ready for BRC AT commands.

If remote modem supports BRC but:

Remote initiation is disabled; The remote modem returns ERROR: BRC DISABLED. This error message has priority over the following message. Remote modem DTE connection not compatible with BRC then the remote modem returns ERROR: BRC NOT ACCESSIBLE.
If the remote modem does not support the BRC feature, it recognizes the initiate BRC state escape sequence simply as user data. 

Transition 2 Online Command State to BRC State           
					

Same as Transition 1.                             

 

Transition 3           

Deleted                                           



Transition 4 The local host user issues ATO command.     
  

BRC to Online Data State.The remote target modem issues an empty CONNECT
message and re-enters the online data state.       



Transition 5 The remote user issues AT$GIVEBRC
command.        

Online Command State to  The remote (target) modem returns OK to both the
BRC State.                The remote user and the local (host) user and
enters the BRC state.                                     



Transition 6 The remote (target) user issues the _+++_ Escape
 

BRC to Online Command State. Sequence:                                 
        

The remote (target) modem exits the BRC state and returns OK to the remote
user. The remote (target) user may enter the escape sequence at any time
during the BRC state. The target modem finishes any pending remote AT command,
sends the EXIT BRC message to the local (host), sends OK to the remote (target)
user and transitions to the online command state.                      
                  

Transition 7 Local User issues ATH command                  

BRC to Idle State. Remote modem responds with OK and transitions to the
hang-up process towards the Idle state. Also, detection of loss of carrier
by the remote modemwill stop the BRC state.                           



Click here to return to the Contents page.