| 摘要 |
a subscriber switch sub-system having a LTAS for controlling a match of the subscriber with an arbitration line, a LSS for controlling a time division switch, a SSS for transmitting and receiving R2 multi frequency code and a dual tone multiple frequency and generating a signal sound, a TCS for controlling overall call processes, and an OSS for processing a specific service call; an internal connection network sub-system having a NTS for performing number translation and routing process, a SNS for maintaining a space switch, a recoding information resource, and a call switch resource, and a CSS for controlling a network synchronization and the space switch; and a central control sub-system having a MSS for collecting statistic data and a CAS. The method comprises the steps of passively limiting a terminating code depending upon call generation ratio by means of a code analysis data base; determining the limit of the call in accordance with the terminating code by means of the data base; analyzing the code by initializing the data; dividing and analyzing the code into three cases, i.e., the first case is that a code state is linked with the next digit, the second case is that the code state is marked with the last link, and the last case is that the code state is filled with codes which are not received; determining the limit possibility of information obtained in the last step after analyzing the code; registering a passive terminating code control function; and cancelling the passive terminating code control function.
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