GB/T 15539-1995

GB/Z 41298-2022 Internet of thing (IoT) application protocol—Test methods of the constrained application protocol (CoAP) GB/Z 41294-2022 Internet of thing (IoT) application protocol—Technical requirements of the constrained application protocol (CoAP) GB/Z 41293-2022 Technology requirements on WAN based fast and self-deployment of sensor and actuator type of devices GB/Z 41292-2022 General technology requirements on WAN based remote measurement and control applications for intelligent agriculture GB/T 2683-1981 Test chart for facsimile transmission GB/T 2789-1981 Technical requirements for network interface for the analogue microwave relay communication systems GB/T 3380-1982 Ringing and tone for telephone automatic switching network GB/T 3378-1982 Subscriber line signalling system for telephone automatic switching network