Time division digital communication system
Apparatus and method for executing communication protocol conversions
Communication system having reconfigurable data terminals
Multi-task state machine signalling translator
Time-division switching circuit transforming data formats
Digital transmission system
Digital telephone switch with simultaneous dual PCM format compatibility Patent #: 5060227
ApplicationNo. 749248 filed on 08/23/1991
US Classes:370/376, Time slot interchange, per se370/377, Having supervisory signaling370/384, Having a supervisory signaling feature370/467, Conversion between signaling protocols379/93.15, Having format conversion379/353Conversion of signal form
ExaminersPrimary: Olms, Douglas W.
Assistant: Blum, Russell W.
Attorney, Agent or Firm
International ClassH04J 003/12
AbstractA time division multiplex switching system converts call formats and signalling protocols so that calls can be interchanged between circuits originating in different networks thereby providing a gateway for telephone transmissions originating from sources (e.g., foreign countries) having differences in transmission (signal attenuation characteristics and companding laws) and signalling and numbering plans or protocols. This switching system is characterized by a processor which is programmed to identify the circuits requiring interconnection and to process signalling messages in accordance with the signalling systems and formats used in the circuits, while translating the signalling messages into common, protocol independent signaling messages which are used for establishing time division multiplex connections in a time slot interchange which is connected to the circuits via PCM highways and for exchanging signalling information (e.g., as to seizure, detection and release) between the circuits; the signalling messages also containing information for conversion of PCM data messages which are switched in the time slot interchange thereby reconciling differences in transmission, such as the companding law used for PCM encoding and decoding and the attenuation (pad value) of the call data in the circuits. The circuits may, for example, be incoming and outgoing trunks.