Multiplex communications – Wide area network – Packet switching
Patent
1989-02-22
1991-02-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, H04Q 1104
Patent
active
049930176
ABSTRACT:
A modularly structured ISDN communication system has a system processor that is administered by a multi-tasking real-time operating system. Since this operating system can only assign system-internal function programs to the system processor (on-line system), a software application module having a time-sharing operating system is provided, so that the same processor can be administered by both operating systems. In order to effect this, one task of the real-time operating system is fashioned as a sluice sub-system SUB in which an allocation switch from the addressing tables of the real-time operating system onto those of the time-sharing operating system occurs. An interrupt transition routine that leads back into the sluice sub-system SUB in which the allocation switch is in turn cancelled is present in the time-sharing operating system for a processing of interrupt requests. Messages can be forwarded from one operating system to the other by use of an intercommunication data segment, so that data from the administration of the one operating system can be transferred into that of the other operating system in a simple manner.
REFERENCES:
patent: 4903258 (1990-02-01), Kuhlmann et al.
"ISDN in the Office -HICOM", Technology and Applications of the HICOM ISDN Communication System, Special Issue Telcom Report and Siemens magazine COM, Dec. 1985, ISBN 3-8009-3846-4, pp. 4-111.
"High Performance Microprocessor with Integrated Memory Management", Intel Corporation, Oct. 1985, No. 231630-001.
Bachinger Gerhard
Barkmeyer Thomas
Kroesa Ehrard
Siegmund Wolfgang
Werres Bernhard
Chin Wellington
Olms Douglas W.
Siemens Aktiengesellschaft
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