Multiplex communications – Wide area network – Packet switching
Patent
1989-12-20
1993-02-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 370 857, H04J 312
Patent
active
051843480
ABSTRACT:
An ISDN multiprotocol communications controller for controlling a communication link of thte S.sub.2 type (LS.sub.21 to LS.sub.24) between a computer (COMP) and a set of terminals (T.sub.1, T.sub.2, . . .) through an automatic telephone branch exchange (PABX) comprising a basic controller (UEI) controlling the higher communication layers of the OSI model and a peripheral device (UPRI) executing the control of communications between the computer (COMP) and the other terminals, as well as the multiplexing and demultiplexing of the data channels of the link. The controller includes, in series, a dynamic allocation device (DADI) allocating the time channels (VT.sub.i, VT.sub.j) corresponding to the data channels, executing the concentration of m time channels of the link in n physical channels (with m>n) of a dual-access memory (DAMI) of the FIFO type, in transmission and reception, and a signal processor (PCSI) connected to a programmable memory (MMI.sub.2) containing programs for processing the multiplicity of protocols contained in the S.sub.2 link. The invention is useful in the control of communications in an ISDN network.
REFERENCES:
patent: 4437183 (1984-03-01), Profet
patent: 4745600 (1988-05-01), Herman et al.
patent: 4888766 (1989-12-01), Ogasawara
Ichikawa et al., "High-Speed Packet Switching System for Multimedia Communications", IEEE 1987.
French et al., "An Eight Channel Synchronous Data Controller for a Primary Rate Interface to ISDN", IEEE 1987.
Kun, Randy, "A VLSI Approach to supporting LAPD in an ISDN exchange termination", IEEE 1986.
Abdelmouttalib Najib
Duflot Didier
Bull S.A.
Jung Min
Olms Douglas W.
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