| 摘要 |
<p>PURPOSE:To secure a communication similar to that secured by connecting directly a polling terminal and the terminal to receive polling together, by performing a control of call in response to the identification number of the terminal to receive polling that is transmitted by the polling terminal as well as providing the polling receiving function to an exchange network. CONSTITUTION:The terminal 1 to receive polling is stored in the packet multiplying device 5-A via te multipoint or a single circuit. At the same time, the device 5-A is connected to the packet exchange 6 by a packet multiplication. Furthermore the computer 4 is stored in the packet multiplying devide 5-B in the form of a single circuit. Thus a packet exchange network is formed. The exchange network includes a polling receiving function and at the same time carries out a control of call in response to the identification number of the terminal to receive polling that is transmitted from the polling terminal. In the case of the multipoint, the terminal parts to receive polling receive a polling successively. In this case a polling is applied to the single circuit in a completely independent cycle. As a result, the access time can be reduced, and at the same time the load of an exchange can be reduced.</p> |
