Abstract: A switchboard system includes an input/output section, first and second switches each for acting an active side switch or a standby side switch, a signal processing section for processing received cells, and a control section. The control section switches active side ascending cell routes from the then active side switch to the then standby side switch, transmits a plurality of specified cells through the active side switch to te signal processing section, and receives the specified cells through the active side switch, and switches active side descending cell routes from the then active side switch to the then standby side switch.

Abstract: A switchboard system includes an input/output section, first and second switches each for acting an active side switch or a standby side switch, a signal processing section for processing received cells, and a control section. The control section switches active side ascending cell routes from the then active side switch to the then standby side switch, transmits a plurality of specified cells through the active side switch to the signal processing section, and receives the specified cells through the active side switch, and switches active side descending cell routes from the then active side switch to the then standby side switch.

Abstract: A mobile communication system includes mobile terminals, radio base stations belonging to low- and high-speed mobile communication systems, and a mobile subscriber connecting apparatus to which the radio base stations are connected. The system uses both a first communication mode including the low-speed mobile communication system and a micro-cell zone and a second communication mode including the high-speed mobile communication system and a macro-cell zone.

Abstract: A mobile communication system has a radio port controller which continuously broadcasts information including a radio port identification through a radio port to be tested, and then specifies one of groups of mobile terminals and transmits a test paging message as many times as required to a coverage area of the radio port with respect to the specified group of mobile terminals. When a mobile terminal belonging to the specified group of mobile terminals receives the test paging message, it measures the quality of a downstream radio link. The mobile terminals transmits a test paging response message together with measured data of the quality of the downstream radio link and the radio port identification number to the radio port controller.

Abstract: A system is provided for processing synchronization signals. A plurality of synchronization signals are received having different periods and different degrees of priority, and are used to generate a regenerated synchronization signal in response to clock pulses. A selector is used for selecting a selected synchronization signal, from among those received synchronization signals having a correct period. The selected synchronization signal is chosen based upon the different degrees of priority. A nonvolatile memory stores memorized synchronization signal and an allowable phase range. An address counter, which receives as an input a controllable initial value, counts the clock pulses to produce a clock count over a period of time, and to cause the nonvolatile memory to output the stored synchronization signal as a read-out synchronization signal and to output the stored allowable phase range as a read-out range, in response to the clock count.

Abstract: A system for use in a local switching center is provided for processing synchronization signals. A transmission sync signal is generated at the local switching center for transmission to a switching center of a higher hierarchy for looping back to the local switching center. The looped back sync signal has a propagation delay time with respect to the transmission sync signal. A time division switch produces clock pulses. A stored pattern is read out of a non-volatile memory according to an address value provided by an address counter which counts the clock pulses of the time division switch. A delay time is also read out of the non-volatile memory according to the same address value. A phase difference signal is produced by comparing the length of the propagation delay time with the delay time read out of the non-volatile memory.

Abstract: Base stations are connected to subscriber lines of neighboring ISDN local switches, and mobile subscriber connection control equipment connected to the subscriber line of a particular ISDN local switch manages mobile subscriber data register equipment. Connection of a call which originates from or terminates at a mobile station, registration of the location of the mobile station, and channel switching process during service are performed by way of the mobile subscriber connection control equipment using an ISDN subscriber interface.

Abstract: In a radio channel selection method, when an originating operation is performed, a mobile terminal transmits a call setting signal indicating that communication can be performed by either of first and second communication schemes in different communication forms. A radio base station then receives the call setting signal from the mobile terminal, and it is checked whether there is any available radio channel in the first communication scheme. If there is an available radio channel in the first communication scheme, the selected available radio channel is transmitted, as a radio channel designation signal, to the mobile terminal. If there is no available radio channel in the first communication scheme, a search for an available radio channel in the second communication scheme is performed. If there is an available radio channel in the second communication scheme, the selected available radio channel is transmitted, as a radio channel designation signal, to the mobile terminal.

Abstract: For synchronization signals of zeroth and first series, a synchronization signal processing system comprises synchronization trunk device of the zeroth and the first series (77(0), 77(1)) for producing particular signals of the zeroth and the first series, respectively, and being exclusively operable in master and slave states.