| 摘要 |
PURPOSE:To reduce the information memory capacity inside an digital exchange by transferring all the information in storage to a receiving terminal device, and after confirming the completion of signal reception, by returning the transmission ready signal to the terminal of transmitting side. CONSTITUTION:Each time when a digital switch 1 stores the information received UI to a memory part 21 of an exchange part 2, it adds '1' to the countered value N stored at a counter part, then the information stored at the memory part 21 is transferred to the terminal device of receiver side. After receiving the information UI, the terminal device 7 of the receiver side sends a transmission ready signal PR. Receiving this, a digital exchange 1 erases the information UI in the memory, and at the same time reduce '1' from the counter value, and checks whether the counter value N is same or less than the number of windows N0. If it is confirmed to be '0', it sends a transmission ready signal to the terminal device 4 of transmission side. |
