Off-hook initiated demand assignment communications

摘要: Off-hook initiated demand assignment (OHIDA) has particular application in communications satellite systems and provides basic trunk service by utilizing an off-hook on-hook signal processing system to monitor control terrestrial access circuits. The operates under the of a central unit interrogate each line. detection scanner condition initiates call sequence. Once trunks between originating terminating circuit switches are connected via circuits, throughout address signalling, message stages. Call complete is performed detect so that may be disconnected.