现行

ITU-T Q.120-Q.139

Specifications of Signalling System No. 4
4号信号系统规范

1988-11-25

现行

ITU-T Q.120-Q.139

Specifications of Signalling System No. 4
4号信号系统规范

1988-11-25

现行

ITU-T Q.180

Interworking of signalling systems No. 4 and No. 5
4号和5号信号系统的互通

1988-11-25

现行

ITU-T Q.180

Interworking of signalling systems No. 4 and No. 5
4号和5号信号系统的互通

1988-11-25

现行

GB/T 39414.4-2020

北斗卫星导航系统空间信号接口规范 第4部分：公开服务信号B3I
Interface specification for signal in space of BeiDou navigation satellite system—Part 4: Open service signal B3I

2020-11-19

现行

ITU-T Q.621

Logic procedures for outgoing signalling system No. 4
4号输出信号系统的逻辑程序

1988-11-25

现行

ITU-T Q.611

Logic procedures for incoming signalling system No. 4
4号进线信号系统的逻辑程序

1988-11-25

现行

ITU-T Q.611

Logic procedures for incoming signalling system No. 4
4号进线信号系统的逻辑程序

1988-11-25

现行

ITU-T Q.621

Logic procedures for outgoing signalling system No. 4
4号输出信号系统的逻辑程序

1988-11-25

现行

ITU-T Q.310-Q.332

Specifications of Signalling System R1
信号系统R1规范

1988-11-25

现行

ITU-T Q.140-Q.180

Specifications of Signalling System No. 5
5号信号系统规范

1988-11-25

现行

ITU-T Q.251-Q.300

Specifications of Signalling System No. 6
6号信号系统规范

1988-11-25

现行

ITU-T Q.400-Q.490

Specifications of Signalling System R2
信号系统R2规范

1988-11-25

现行

ITU-T Q.400-Q.490

Specifications of Signalling System R2
信号系统R2规范

1988-11-25

现行

ITU-T Q.310-Q.332

Specifications of Signalling System R1
信号系统R1规范

1988-11-25

现行

ITU-T Q.140-Q.180

Specifications of Signalling System No. 5
5号信号系统规范

1988-11-25

现行

ITU-T Q.251-Q.300

Specifications of Signalling System No. 6
6号信号系统规范

1988-11-25

现行

ITU-T Q.634

Logic procedures for interworking of signalling system No. 4 to R2
4号至R2号信号系统互通的逻辑程序

1988-11-25

现行

ITU-T Q.681

Logic procedures for interworking of signalling system R2 to No. 4
信号系统R2至4号互通的逻辑程序

1988-11-25

现行

ITU-T Q.681

Logic procedures for interworking of signalling system R2 to No. 4
信号系统R2至4号互通的逻辑程序

1988-11-25