Multiplex communications – Wide area network – Packet switching
Patent
1992-06-10
1994-01-18
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8511, H04L 1240
Patent
active
052804828
ABSTRACT:
An apparatus for transferring data in a time-sharing mode includes a plurality of modules connected to a common bus line for transferring data therethrough, a bus controller for controlling a time-sharing transfer of data between the modules, and a system controller connected to the modules and bus controller through a bidirectional command line. The system controller is operable, upon receipt of a data transfer request or data transfer completion notice from certain of the modules, to command the bus controller to generate or eliminate a bus slot. Then, the bus controller sets a new bus slot to a bus cycle, or eliminates a designated slot from the bus cycle, thereby to vary the number of slots constituting the bus cycle. Slot enable signals corresponding to the respective slots are transmitted to the modules through the bus line. Each module successively compares a slot number and slot enable signals, and exchanges data with the bus line upon agreement between the slot number and slot enable signals.
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patent: 4491916 (1985-01-01), Vallhonrat
patent: 4600988 (1986-07-01), Tendulkar et al.
patent: 4669079 (1987-05-01), Blum
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"Dynamic Slot Allocation in Data Transmission System" by H. Buerge et al., IBM Technical Disclosure Bulletin, vol. 19, No. 7, Dec. 1976, pp. 2725-2726.
"Bus Arbiter with Dynamic Priority Adjustment", IBM Technical Disclosure Bulletin, vol. 29, No. 8, Jan. 1987, pp. 3272-3273.
Inoue Toshifumi
Kitamura Hideaki
Dainippon Screen Mfg. Co,. Ltd.
Kizou Hassan
Olms Douglas W.
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