DE76844T1 - DATA PROCESSING SYSTEM WITH TWO-CHANNEL SYSTEM BUS. - Google Patents

Claims (1)

■, ■ . η _1-31 May 1983 2751A / EPC EP 82901654.2 NCR Corporation,
World Headquarters, Dayton, Ohio 45479 (V.St.A.)
A U Translation of the claims 1. Data processing system with a large number of subsystems (424A, 424B, 424C) and a first communi- cation channel (A), which has a first star coupler (416A) which is suitable for passing messages between the subsystems (424A, 424B, 424C), characterized by a second communication channel (B) with a second star coupler (416B), 30 which is suitable for messages between the subsystems (424A, 424B, 424C), whereby one broadcast from any of the subsystems (424A, 424B, 424C) Message either through the first star coupler (416A) or through the second star coupler (416B) 35 routed and through all subsystems (424A, 424B, 424C) Will be received. -2- Data processing system according to Claim 1, characterized in that each of the subsystems (424A, 424B, 424C) with the first and second channels (A, B) through associated bus interface means (428) is coupled, each bus interface means including selection means (610) adapted to be selective a message sent by its assigned subsystem only on either the first or the second channel (A, B) to give. 3-data processing system according to claim 2, characterized in that each bus interface means (428) receiving means (584A, 584B, 590), p. which are suitable a message either on the first or to receive on the second channel (A, B), as well as control means (598) suitable for only the received Message on the first or second channel (A, B) to their assigned subsystem (424A, 424B, 424C) 2Q forward. 4. A data processing system according to claim 1, characterized in that the first and second channels have respective pairs of first and second transmission lines (418A, 420A; 418B, 420B), each of the pairs with at least one of the systems (424A, 424B, 424C) is coupled, whereby a message sent by that of the subsystems (424A, 424B, 424C) runs on the first transmission line (418) and is passed through the associated star coupler (416A) to the second transmission line (420A) in each associated pair and along the second Transmission line (420A) to all subsystems (424A, ₇ 424B, 424C). 5. Data processing system according to claim 4, characterized in that each star coupler one 00768U optical star coupler (416A, 416B), and that every first and second transmission line in each pair an optical transmission line (418 £, 42OA; 418B, 42OB).
5 6. Data processing system according to claim 5, g e k e η η records through a plurality of stations (412), with a group of the subsystems (424A, 424B, 424C) within a housing of each of the stations and with each group of subsystems (424A, 424B, 424C) within of the housing in each of the stations (412) with the pairs of first and second transmission lines in both the first and second channel (A, B) is coupled. 7- Data processing system according to claim 6, characterized in that each first and second Transmission line corresponding first and second electrical transmission lines (418AA, 420AA; 418BB, 420BB) and that each of the stations (412) has a pair of first and second transmission lines associated therewith (418AA, 42OAA; 418BB; 420BB), where each group of subsystems (424A, 424B, 424C) at each of the stations (412) with each pair of the first and second electrical transmission lines (418AA, 42OAA; 418BB, 42OBB) are coupled to that station and that each pair of the first and second electrical transmission lines (418AA, 420AA; 418BB, 42OBB) to the one pair of optical transmission lines (418A,. Q ₀ 42OA; 418B, 418B) is coupled. 8. Data processing system according to claim 1, characterized in that each star coupler is a electrical star coupler (16B) is. 9. Data processing system according to claim 1, characterized in that each star coupler is a magnetic star coupler (16C).