No.7 signal processing apparatus of the private exchange is provided with a number corresponding to the number of highways in the trunk interface portion, and has No.7 processing portions for extracting and inserting No.7 signals, and No.7 processing portions are respectively No.7 processor and It is composed of dual port memory, and the control unit of No.7 signal processing device and No.7 processors independently access corresponding dual port memory to process No.7 signal.
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