DATA PROCESSING SYSTEM WITH MAINTENANCE PROCESSOR FOR CONTROLLING MAINTENANCE OPERATIONS AND METHOD FOR PERFORMING SUCH MAINTENANCE OPERATIONS.

摘要

When a number of existing interface connections (SI) for connecting the various functional units (FUMM, FUCPU, FUIOP) of the data processing system to a maintenance processor (SVP) is too small, additional subunits (M1 to Mn) of a functional unit (for example FUIOP) are connected via a separate common maintenance line system (SI-BUS) which is coupled to the interface adaptor (SIA) of this functional unit via an interface convertor (MSI). With given instructions, the latter forwards the interface signals normally generated by the interface adaptor (SIA) for the associated internal interface (FIF) to the functional unit (FUIOP) in adapted manner, together with the data transmitted from the maintenance processor (SVP), via the maintenance line system (SI-BUS) to all subunits (M1 to Mn) which are coupled to the maintenance line system (SI-BUS) via individual maintenance adaptors (MIA). The instructions are transmitted as data transmission to all subunits and in each case one of the subunits is selected by a unit number also transmitted in the instruction before genuine data can be transmitted or called up. IMAGE