(1) Pertaining to a state of a processing unit that prevents the occurrence of certain types of interruptions. See also enabled.
(2) Pertaining to the state in which a transmission control unit or audio response unit cannot accept incoming calls on a line.
(3) In VTAM, pertaining to a logical unit (LU) that has indicated to its system services control point (SSCP) that it is temporarily not ready to establish LU-LU sessions. An initiate request for a session with a disabled logical unit (LU) can specify that the session be queued by the SSCP until the LU becomes enabled. The LU can separately indicate whether this applies to its ability to act as a primary logical unit (PLU) or a secondary logical unit (SLU). See also enabled, inhibited.