ISDN terminal adapter with teleconference provision
October 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesThree-party conference circuit for digital time-division-multiplex communication systems Agent communication arrangements for telecommunication systems Switching system having capability for telecommunication conferences Communication lines with terminate and leave capability-VF data bridge ISDN subscriber terminal control system Local communication system among ISDN terminal equipments Patent #: 4792800 InventorAssigneeApplicationNo. 419234 filed on 10/10/1989US Classes:370/264, Using plural diverse channel communications with a dedicated signaling channel (i.e., ISDN)370/524, Using a dedicated signaling channel (i.e., D-channel)379/93.14, Having switching station379/202.01ConferencingExaminersPrimary: Olms, Douglas W.Assistant: Hsu, Alpus H. Attorney, Agent or FirmForeign Patent References
International ClassesH04J 003/12H04M 003/42 AbstractA device for providing teleconference capabilities in an ISDN includes a first receiver for receiving a first signal representing a first message over a first ISDN B-channel. A second receiver receives a second signal representing a second message over a second ISDN B-channel. A receive mixer mixes the first signal with the second signal to produce a receive mixed signal. A local receiver receives a local signal representing a local message to be transmitted over the first and second ISDN B-channel. A first transmit mixer mixes the first signal with the local signal to produce a first transmit mixed signal. A first transmitter transmits the first transmit mixed signal over the second ISDN B-channel. A second transmit mixer mixes the second signal with the local signal to produce a second transmit mixed signal. A second transmitter transmits the second transmit mixed signal over the first ISDN B-channel. | |
