Radio PBX for personal communications system
A Radio PBX for use in a Digital Mobile Telephone system includes a plurality of transceivers to transmit and receive RF signals to and from subscriber units and/or an external base station in which at least one set of transmitter and receiver is communicating those RF signals, converting their frequencies and/or protocol, and said radio PBX is connected to one common antenna communicating with the subscriber unit and/or one common antenna communicating with the base station. The transceivers have a capability to convert said RF signals into base band signals and modulate them into new RF signals by adapting said base band signals between said transmitter and receiver. Moreover, each transceiver is tailored and/or automatically assigned for one of the Control trunk, Communication trunk, Local Line trunk, Service trunk, and/or Incoming and Outgoing Line trunk within a radio PBX. The control trunk is provided to synchronize with an external base station, and to control the control channel to and from an external base station and/or subscriber unit within a serving area. The communication trunk is provided to connect the communications between said base station and said subscriber units, and/or between the control trunk and said subscriber units. The local line trunk is provided to connect the communications between said subscriber units. The service trunk provides 3-way call bridge, voice mail, etc. The incoming and outgoing line trunk is provided to connect the communications between telephone lines and said subscriber units, and/or between telephone lines and communication trunks. The incoming and outgoing line trunk can be located remotely and can be connected to said radio PBX and/or communication trunks through open air propagation and/or existing CATV cable network and/or coaxial cable network. By the present invention, very cheap and higher traffic capacity of a radio PBX can be realized. And moreover, the higher efficiency in the channel usage can be ensured.