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1. (WO2007004742) COMMUNICATIONS DEVICE AND COMMUNICATIONS METHOD
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CLAIMS

1. A communications device that is connected to a power line transmitting a waveform having characteristics of N-phase and T-cycle and performs communication by way of the power line, the communications device comprising:
a synchronous generator that generates a synchronous signal based on the waveform; and
a controller that outputs a control signal to the power line during a period of T/2M based on the synchronous signal generated by the synchronous generator, the control signal including information for allowing a plurality of communications devices to co-exist on the power line, the M being the N multiplied by a natural number.

2. The communications device according to claim 1, wherein the M is three.

3. The communications device according to claim 1, wherein the control signal includes a request for starting communication or communication end information.

4. The communications device according to claim 1, further comprising:
a data communications section that performs data communication by way of the power line, wherein
the controller controls data communication performed by the data
communications section in accordance with the control signal.

5. The communications device according to claim 4, wherein the controller controls data communication during a communication period subsequent to the period in accordance with the control signal.

6. The communications device according to claim 4, wherein the controller controls data communication in a communication period subsequent to the period in accordance with a control signal received from another communications device.

7. The communications device according to claim 6, wherein the communication period has a length of the period multiplied by an integer.

8. The communications device according to claim 5, wherein the control signal further includes information showing a length of the communication period.

9. The communications device according to claim 5, wherein the data communications section performs data communication in each communication period.

10. The communications device according to claim 1, wherein the control signal has a plurality of divided time segments, and specifics of control method are shown by a combination of signals of respective time segments.

11. The communications device according to claim 1, wherein the controller outputs a control signal including the same information in each of the plurality of periods which are adjacent to each other in terms of time.

12. The communications device according to claim 1, wherein the controller outputs the control signal when the data communications section does not performs data communication.

13. A communications method for a communications device is connected to a power line transmitting a waveform having characteristics of N-phase and T-cycle and performs communication by way of the power line, the method comprising the steps of:
generating a synchronous signal based on the wave form; and
outputting a control signal to the power line during a period of T/2M based on the synchronous signal generated by the synchronous generator, the control signal including information for allowing a plurality of communications devices to co-exist on the power line, the M being the N multiplied by a natural number.