Study of passive q - switched unit of ndyag laser using ion - implanted gaas 离子注入sigaas做激光器被动调q元件的研究
Valve position switch unit 阀位开关装置
Tsu : time switching unit 时隙交换单元
Circuit switching unit 电路交换单元
In communications , a circuit , or channel , interconnecting two exchanges or switching units , capable of being switched at both ends provided with the necessary signalling and terminating equipment 在通信技术中,两个交换局或交换机之间的连接电路或信道,它能够在两端之间进行转接,并提供必要的信令和终端设备。