Telephonic communications – Special services – Conferencing
Patent
1986-09-22
1989-02-07
Dwyer, James L.
Telephonic communications
Special services
Conferencing
379201, 379292, 379216, H04M 356
Patent
active
048037206
ABSTRACT:
The invention is a software reconfigurable cross point switch which selectively interconnects a plurality of phone lines and a plurality of shared resources such as call progress monitors, dual tone multifrequency (DTMF) receivers, DTMF automatic dialers and automatic answer tone detectors. The invention achieves its objective of enhanced switching efficiency and greater flexibility in the connectivity between diverse communications elements, by independently switching two separate switching planes of the cross point switch so as to enable different paths to be taken by the transmit portion and the receive portion of a particular telephone connection.
The cross point switch architecture invention flexibly allows for many applications, one in particular being conference summing. By providing a plurality of build-out resistors connected to the separate inputs of one plane of the cross point switch, and connecting the corresponding outputs from the cross point switch to a single input of the summing amplifier, a conference summing function can be performed.
REFERENCES:
patent: 3531773 (1968-02-01), Beebe
patent: 3544726 (1970-12-01), Wimberly
patent: 3546394 (1970-12-01), Platt et al.
patent: 3577125 (1971-05-01), Frisbie
patent: 3588827 (1971-06-01), Hoffman et al.
patent: 3792200 (1974-02-01), Altenburger et al.
patent: 3792202 (1974-02-01), Adams, Jr. et al.
patent: 3814862 (1974-06-01), Eddy
patent: 3828314 (1974-08-01), Bradbery et al.
patent: 3865979 (1975-02-01), Hestad
patent: 3891801 (1975-06-01), Wang
patent: 3903373 (1975-09-01), Gueldenpfennig et al.
patent: 3928730 (1975-12-01), Aagaard et al.
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4046966 (1977-09-01), Urui
patent: 4075608 (1978-02-01), Koenig
patent: 4153817 (1979-05-01), D'Ortenzio
patent: 4232198 (1980-11-01), Warman
patent: 4424418 (1984-01-01), Moore et al.
COS/MOS 4.times.4 Crosspoint Switch with Control Memory, Digital Integrated Circuits, RCA Solid State Division, File No. 1076.
J. Lemp, Jr., "The 805A PBX-A Switching Bargain for Small Businesses," Bell Labs Record, vol. 51, No. 5, May 1973, pp. 136-142, see p. 138.
Witschi et al., "Application of Operational Amplifier Techniques . . . " IEEE NE Elec. Research & Engineering Meeting, 9/3/65, pp. 30-31.
Newell Darryl C.
Schroeder Karl F.
Wilkie Bruce J.
Dwyer James L.
Hoel John E.
International Business Machines - Corporation
LandOfFree
Dual plane cross point switch architecture for a micro-PBX does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual plane cross point switch architecture for a micro-PBX, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual plane cross point switch architecture for a micro-PBX will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1089823