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介绍EWSD数字程控交换系统的APS安全防护 ,说明了APS代的概念 ,具体介绍了各级别恢复软件(Recovery)的功能以及恢复软件的升级顺序等。
Describes APS security protection of EWSD digital program-controlled switching system, explains the concept of APS generation, introduces the functions of recovery software at various levels and the upgrade order of recovery software.