... 本文针对传统密码锁的密码存在被窃取复制的危险,安全性不足的问题,提出了一种电话远程控制密码锁系统。该系统利用公共交换电话网络(PSTN),使用多重密码,实现电话远程控制开锁。该系统由来电号码检测模块、DTMF信号检测模块、语音提示模块、E2PROM存储模块和电磁驱动...
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Call Forwarding示例显示了访问转寄的特性,该特性一般见于公共交换电话网络,但是它使用了一个SIP网络。
The call forwarding sample demonstrates the call forwarding feature typically seen in public switched telephone networks, but it USES a SIP network.
话音是人与人之间交流的主要方式,从最早出现公共交换电话网络到现在的第三代移动通信,语音通信是其最基本的功能。
As voice communications is the primary media of communication for human being, it plays a very important role from public switched telephone network to the third generation mobile communications.
从市场情况来看,电信业的竞争正在加剧,PSTN(公共交换电话网络)、CATV(有线电视网)、ATM和IP(数据网)都在相互窥视对方的传统市场。
According to the circumstances of the market, the competition of the telecom vocation is intensifying, the operators of PSTN, CATV, ATM and IP networks are peeking at others traditional markets.
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