The legacy telephone switches all use the 2 mbs ports as their trunk modules 传统的话音交换机使用的中继模块都是2mbits端口。
General technical requirements and test methods for manual toll telephone switching equipment 人工长途电话交换设备通用技术要求和测试方法
Technical requirements and test methods for relays in manual toll telephone switching equipments 人工长途电话交换设备中继器技术要求和测试方法
Building 2 million ports digital program - controlled telephone switching systems for beijing telecom bureau 共200万数字程控交换机的安装开通项目管理。
Technical requirements and test methods for monitor ' s desks in manual toll telephone switching equipments 人工长途电话交换设备班长台技术要求和测试方法
The test methods for the technical specifications of ringing and tone for automatic telephone switching network 电话自动交换网铃流和信号音技术指标测试方法
The test methods for the technical specifications of subscriber line signalling for automatic telephone switching network 电话自动交换网用户信号技术指标测试方法
Digital program - controlled telephone switching system project ( 6 , 000 lines and trunks ) pingyao telecom bureau , shanxi province 陕西电信西安小寨局20000门程控交换机开通工程。
