[{"title":"( 8 个子文件 10.17MB ) 现代交换原理 ppt课件","children":[{"title":"第六章 呼叫处理的基本原理1.ppt <span style='color:#111;'> 3.03MB </span>","children":null,"spread":false},{"title":"第三章 1数字交换机的话路部分.ppt <span style='color:#111;'> 3.35MB </span>","children":null,"spread":false},{"title":"第八章 电话网及信令系统.ppt <span style='color:#111;'> 2.50MB </span>","children":null,"spread":false},{"title":"第七章 交换技术基础2.ppt <span style='color:#111;'> 105.12KB </span>","children":null,"spread":false},{"title":"第五章电话网及信令系统.ppt <span style='color:#111;'> 2.46MB </span>","children":null,"spread":false},{"title":"第二章 语音信号数字化.ppt <span style='color:#111;'> 878.00KB </span>","children":null,"spread":false},{"title":"第一章 概述.ppt <span style='color:#111;'> 427.50KB </span>","children":null,"spread":false},{"title":"第四章 程控交换机控制系统.ppt <span style='color:#111;'> 358.50KB </span>","children":null,"spread":false}],"spread":true}]