Multiplex communications – Wide area network – Packet switching
Patent
1988-03-10
1990-01-09
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 582, H04J 312, H04Q 1104
Patent
active
048933104
ABSTRACT:
A key telephone system includes a plurality of ports being linked by port associated bidirectional communication channels which are synchronously switched by transferring bit states between ones of the channels to provide communication paths between the ports as directed by a central processor. The ports are also linkable to and via the central processor by port associated message channels. An interface circuit is responsive to the central processor and message channel signals for regulating flow of messages received by the central processor and for effecting single and plural channel distribution of messages from the central processor. The message channels permit telephony operating features and functions to be provided either within the central processor or by appropriate apparatus means being connected at any of the ports.
REFERENCES:
patent: 4430733 (1984-02-01), Hardy et al.
patent: 4514597 (1985-04-01), Kikuchi et al.
patent: 4602132 (1986-07-01), Nagatomi et al.
patent: 4615028 (1986-09-01), Lewis et al.
patent: 4730304 (1988-03-01), Mezera et al.
patent: 4763316 (1988-08-01), Schaich et al.
Chapman Alan S. J.
Maginley Ronald J.
Morley Robert S.
Nizamuddin Nadir
Redmond Alan M.
Chin Wellington
Northern Telecom Limited
Safourek Benedict V.
LandOfFree
Digital key telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital key telephone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital key telephone system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-149876