Patent
1975-03-21
1977-12-06
Brown, Thomas W.
H04J 600
Patent
active
040618803
ABSTRACT:
Time-multiplex programmable switching apparatus for establishing on demand time shared connections between pairs of ports. Signals within the system are digital. The invention is described in the context of an electronic private automatic branch exchange (EPABX) telephone system. A central processor unit (CPU) including a recirculating memory carries port address pairs and digital information to be exchanged along with a status word used for identifying program loops. Program steps are sequenced or initiated by timing signals and signaling data from the port units. Common buses interconnect the port units with the central processor unit. Port units are grouped with a common buffer memory for converting parallel data from the CPU to serial form. The CPU memory includes slots for housekeeping functions to detect, inter alia, an off-hook telephone. The principles of the invention are applicable to telephone central offices and digital switching systems as for computers, for example. Individual EPAX's may be interconnected for expanded service.
REFERENCES:
patent: 3522380 (1970-07-01), Kneisel et al.
patent: 3627951 (1971-12-01), Batin
patent: 3781478 (1973-12-01), Blahut et al.
patent: 3787631 (1974-01-01), Lewis
patent: 3828136 (1974-08-01), Perna et al.
patent: 3851104 (1974-11-01), Willard et al.
patent: 3860761 (1975-01-01), O'Neill, Jr.
patent: 3885106 (1975-05-01), Deutsch
Collins Galen R.
Gendo Indra Lee
May George A.
Brown Thomas W.
Dicom Systems, Ltd.
LandOfFree
Time-multiplex programmable switching apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Time-multiplex programmable switching apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-multiplex programmable switching apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1552218