Second branch office equipment with control sequence memory - in which procedural information is addressed according to signal combination with different equipment and function criteria

摘要

The second branch office equipment (1) is connected by separate lines (2,3) to independent first branch office counterparts (4,5). A direct exchange line (6) is provided to the second branch office equipment (1) as well as to each of the others, where different exchange engagement criteria ("Earth" and "Flash") apply. A so-called directional exclusion code necessary for exchange line engagement conveys information as to the type of power characterisitcs and operation to be activated. A zero may serve for exchange connection, and a 1 for checkback. ADVANTAGE - Simplified operation is achieved without substantially increased cost.