Motorola V3229 Operating Instructions - Page 55

Operation -18 ¥Automatic - backup due to extended loss of carrier or 4 unsuccessful retrains in 3 minutes ¥Manual - user determined using front panel controls or AT commands Note: In 4-wire leased line operation, if both units have autodial backup enabled, one must be configured for forced answer. This prevents both units from dialing if the leased line fails. Both methods use the prestored autodial number. If the dial attempt is unsuccessful after three tries, a retrain on the leased line will be initiated. In automatic and manual mode the return to leased line is initiated after the lookback time in register S28 has elapsed. In automatic mode unnecessary termination of the dial line connection is prevented by a leased line lookback test. If the leased line is not acceptable, the dial connection is resumed with a retrain. If the leased line is acceptable, the dial connection is dropped and normal leased line mode is resumed. If return to lease line is manually invoked in manual dial backup mode the dial line is dropped immediately. When the unit attempts to return to leased line, the LCD displays LEASE LOOKBACK. If the leased line has been restored to service, data can be passed approximately 10 seconds after LEASE LOOKBACK was initiated. The LCD will continue to display LEASE LOOKBACK for slightly more than a minute. When the LCD displays ON LINE again the dial line is disconnected. Note: A diagnostic test initiated during dial backup V.3229 / V.3229L