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| Patent ID | Title | Date Filed |
| 5283786 | Burst architecture time-division switch and equipment access module for use in a switch of this kind
| November 20, 1991 |
| 5271002 | Communication switching element
| August 2, 1990 |
| 5268895 | Signaling message routing control using composite point code status
| May 23, 1991 |
| 5263121 | Neural network solution for interconnection apparatus
| September 12, 1991 |
| 5214638 | Digital communication electrical/optical access node having buffer memory matrix for switchable multi-channel bidirectional transmission
| November 8, 1990 |
| 5197063 | Circuit switching method and apparatus for time division network with various transmission speeds
| January 16, 1991 |
| 5138608 | Circuit arrangement for testing parts of a digital time-division telecommunication switching center, particularly a telephone switching center
| September 27, 1990 |
| 5093826 | Method for the operation of a multi-processor central control unit of a switching system
| September 19, 1989 |
| 5088089 | Apparatus for programmably accessing and assigning time slots in a time division multiplexed communication system
| December 15, 1989 |
| 5051982 | Methods and apparatus for implementing switched virtual connections (SVCs) in a digital communications switching system
| July 27, 1989 |
| 5045850 | Paging system with centralized page source and distributed page sources
| December 26, 1989 |
| 5040173 | Network control arrangement based on topological equivalence
| May 8, 1989 |
| 4993016 | Network control arrangement for processing a plurality of connection requests
| May 8, 1989 |
| 4991168 | Concurrent multi-stage network control arrangement
| May 8, 1989 |
| 4885741 | Data communication arrangement with embedded matrix switch
| August 3, 1988 |
| 4885738 | Method of and apparatus for establishing a wideband communication facility through a switched communications network having narrow bandwidth time division multiplexed channels
| July 31, 1987 |
| 4866708 | Communication channel ownership arrangement
| October 28, 1987 |
| 4852083 | Digital crossbar switch
| June 22, 1987 |
| 4811333 | Substantially non-blocking space switching arrangement
| March 31, 1987 |
| 4785446 | Distributed bit switching of a multistage interconnection network
| November 7, 1986 |
| 4761647 | Eprom controlled tri-port transceiver
| April 6, 1987 |
| 4740953 | Time division speech path switch
| May 7, 1986 |
| 4736362 | Programmable data-routing multiplexer
| July 26, 1985 |
| 4704716 | Method and apparatus for establishing a wideband communication facility through a communication network having narrow bandwidth channels
| December 31, 1985 |
| 4704606 | Variable length packet switching system
| February 24, 1987 |
| 4695997 | Device for performing wrap tests on a multiplex link in a data communication system
| June 14, 1985 |
| 4688212 | Centralized image responsive telephone time slot interchange system
| January 31, 1985 |
| 4656625 | Switching system having capability for telecommunication conferences
| May 28, 1985 |
| 4654845 | Parallel call processing system and method
| March 18, 1985 |
| 4628505 | Signaling terminal system for CCITT No. 7 common channel signaling system
| December 11, 1984 |
| 4615028 | Switching system with separate supervisory links
| February 6, 1984 |
| 4551831 | Time division multiplexed system for non real time digital switching
| January 31, 1984 |
| 4547877 | System for switching multirate digitized voice and data
| June 9, 1983 |
| 4530089 | Telecommunications digital switchblock utilizing control switch state maps
| July 26, 1983 |
| 4525831 | Interface arrangement for buffering communication information between a transmitting and receiving stage of a time-space-time digital switching system
| June 22, 1983 |
| 4524441 | Modular space stage arrangement for a T-S-T digital switching system
| June 22, 1983 |
| 4514842 | T-S-T-S-T Digital switching network
| November 3, 1983 |
| 4512012 | Time-switch circuit
| February 10, 1983 |
| 4509169 | Dual rail network for a remote switching unit
| November 3, 1983 |
| 4499461 | Circuit arrangement for centrally-controlled telecommunication exchange systems, particularly for time-division multiplex telephone exchange systems, with information exchange between PBX devices
| July 1, 1982 |
| 4497054 | One-for-N redundancy in a digital switch matrix
| April 29, 1983 |
| 4488292 | PCM-TDM Switching system using time slot multiples
| December 9, 1981 |
| 4470139 | Switching network for use in a time division multiplex system
| December 28, 1981 |
| 4450557 | Switching network for use in a time division multiplex system
| November 9, 1981 |
| 4399534 | Dual rail time and control unit for a duplex T-S-T-digital switching system
| December 23, 1980 |
| 4392224 | Speech path switching system in time-divisional electronic telephone switching system
| August 12, 1980 |
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