程控交换机的呼叫处理能力是一项重要的技术数据。
The call handling capacity of the SPC switching system is one of the most important technical data.
实现N—ISDN的关键技术之一是对现有程控交换机的改造。
One of the key techniques of N-ISDN is how to redesign and reform the existing stored program control exchangers.
随着交换机的更新换代，技术的不断提高，交换机的发展趋势为更加数字型的程控交换机。
With switches upgrading, technology is constantly increasing, the trend for more control of program - controlled switches few fonts.
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