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Abandon Call and Retry (ACR)
ACR is supplied by the dialer to indicate that the call cannot be successfully established. The on condition instructs the DTE to abandon the call by dropping the call later. ACR remains on until CRQ is turned off.
EXAMPLE DIAL SEQUENCE
The following is an example of the sequence of events that occur when a call is initiated using the
•Data Line Occupied (DLO) must be off for the dial sequence to begin.
•The DTE turns on Call Request (CRQ) to initiate dialing.
•When CRQ is turned on, the dialer port turns on DLO to indicate that the data port is now in use. The dialer turns on Present Next Digit (PND) to request a dial digit from the DTE.
•The DTE sets the digit signal circuit bits (NB1, NB2, NB4, and NB8) to the correct value for the first dial digit, then turns on Digit Present (DPR).
•When DPR turns on, the dialer reads the digit and responds with another PND.
•The PND/DPR sequence continues until either EON is received or five seconds expires without receiving another digit (DPR is not turned on to present another digit).
•When all the digits are received, the dialer initiates the call on the data port to which the dialer is dedicated.
•When the call is connected, Distant Station Connected (DSC) is turned on by the dialer port. If the call cannot complete successfully, Abandon Call and Retry (ACR) is turned on until CRQ is turned off.
•The call can be terminated before the call is connected by turning CRQ off.
•Once the call is completed, the call can be terminated by normal disconnect methods such as disconnect by the switch, the front panel, or DTR disconnect.
UTA220/UTA220k |