| 摘要 |
PURPOSE: The packet interface switching subsystem of a full electronic exchange is provided to implement a packet data processing circuit pack performing an X.25 interface function and an X.75 interface function, and to make a subscriber access a PSPDN(Packet Switched Public Data Network) and an ISDN(Integrated Services Digital Network) through one packet interface switching subsystem, so that system maintenance can be easily performed. CONSTITUTION: PLCPs(Packet Layer Control Processors(110,111) control an X.25 packet layer and an X.75 packet layer. A PHM(Packet Handling Module,120) charges the processing of a X.25 protocol packet and an X.75 protocol packet. A message switching local module(400) is for IPC(Inter Processor Communication) between the PLCPs(110,111) and the PHM(120). A modem(130) connected with the PHM(120) communicates with an external subscriber in a packet switched network. A TCP(Telephony Control Processor,200) performs an interface switching control function to make a full electronic exchange supply a packet data service to an ISDN subscriber. A TSL(Time Switching and Link,400) performs time switching for packet data of a subscriber. A TLCP(Telephony Link Control Processor,300) manages the TSL(400) according to control of the TCP(200). |
