| 摘要 |
<p>PURPOSE:To easily extend terminals while keeping the band of a permanent virtual circuit(PVC) for connectionless mode communication a required minimum by constituting connectionless processing devices so that they can set mutual connection. CONSTITUTION:A connectionless processing device 4 is provided with an incoming call processing part 41 and a call set processing part 47 as means to set the connection to another connectionless processing device 4. The connectionless processing device 4 sets a call, and thereby, all of busses between connectionless processing devices are not kept directed to the device of the other party but only busses whose frequency in communication is easpecially high are always reserved. Busses whose frequency in communication is low are reserved by the call control at the time of arriving a message. Thus, the PVC band for connectionless mode communication in the network is reduced to a required minimum, and a communication request is satisfied up to a maximum even with respect to momentary concentration of communication to one line.</p> |
