PROCESSING COMMUNICATION DATA IN A SHIPS PASSING CONDITION

Articles of manufacture, apparatuses, and methods for processing communication data in a ships passing condition are disclosed. Embodiments include a computer program product for performing a method including: obtaining a Transport Command Control Block (TCCB) from a location in memory specified by a Transport Command Control Block address of a Transport Control Word; opening a first exchange and sending, by a channel subsystem, the TCCB in the first exchange to a control unit; receiving, by the channel subsystem, an unsolicited first message in a second exchange from the control unit, the unsolicited first message opening the second exchange, the second exchange being a different exchange than the first exchange; and sending, by the channel subsystem, a second message to the control unit in a third exchange, the second message comprising a status of the first message, the second message configured to open and close the third exchange.