Telephone operation and circuit switch is always the mainstream of the field of telecom since 100 years ago.
100多年来，电话业务和电路交换始终是电信业的主流。
参考来源 - IP电话QoS保障协议——RSVP的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
High Speed Circuit Switch Data?
高速线路转换数据HSCSD ？
The utility model relates to a circuit switch, in particular to be used for controlling and switching street lamps.
本实用新型涉及一种电路开关，特别是用于路灯控制和开关。
In the Stage of R4, ATM and IP become main medium of circuit switch instead of TDM, which make codec modes of core network more agility.
在R4阶段，ATM和IP承载渐渐取代TDM承载成为电路域的主要传播媒介，这两类传输媒介的引入使得核心网采用的编解码方式更加的灵活。
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