Call handling capability of SPC switching system affects directly the reliability and usability of the full system.

程控交换机处理能力的高低，影响着系统的可靠性和实用性。

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This article analyses overhead of the system, starting from the time distribution of central processor in SPC switching system. Some methods increasing call handling capability are also described.

本文从程控交换机的中央处理机时间分配入手，进而对系统开销进行分析，并提出一些提高呼叫处理能力的方法。

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