Multiplex communications – Wide area network – Packet switching
Patent
1985-07-26
1988-04-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082552, H04Q 1104
Patent
active
047363622
ABSTRACT:
A multiplexer for use in a digital subscriber controller having a number of analog ports and digital ports which can be programmed via an external microprocessor to establish time-division multiplexed bidirectional data paths between three subscriber-selected ports designated as "sources" and three subscriber-selected ports designated as "destinations". Among the ports is a line-interface port having two 64 kilobit-per-second channels on which analog/digital data is received from and transmitted onto the network transmission line. Among the digital ports is a three-channel serial port and a two-channel microprocessor interface port. An analog port is also provided at which a variety of audio transducers may be connected. The data-routing multiplexer consists of three sections, each comprising a plurality of registers connected to a single internal bus on which time-division-multiplexed signals are generated and received by particular subscriber-selected registers, each register within a section serving as either a generator or a receiver for the internal bus for a particular digital channel. An extension of the internal bus is connected to the analog port. A set of three control registers stores the subscriber-selected sources and destinations. Control signals are generated therefrom which affect the subscriber-selected interconnection of registers within the data-routing multiplexer with the internal bus. The multiplexer facilitates maintenance and testing of the digital subscriber controller by permitting a loopback path to be established for a device connected to a port by simply designating a path having that port as both its source and destination.
REFERENCES:
patent: 4547877 (1985-10-01), Lehman et al.
patent: 4589107 (1986-05-01), Middleton et al.
patent: 4689783 (1987-08-01), Kaczerowski
Clark Alan T.
Lange Arthur F.
Advanced Micro Devices , Inc.
King Patrick T.
Olms Douglas W.
Salomon Kenneth B.
Scutch III Frank M.
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