| GPRSThe General Packet Radio Service (Universal grouping wireless service) is a new type of grouping data transmission service activated on the existing GSM network, it is a set of wireless transmission methods developed based on the concept of packet-switched. GPRS uses the group exchange technology, which allows multiple users to share some fixed channel resources. GPRS is particularly suitable for intermittent, sudden, or frequent, small amounts of data transmission and occasional transmission of large data volumes, it has the advantages of "real-time online", "pay-as-you-go", "Quick Logon", "high-speed transmission", and "easy switch.CDMACode Division Multiple Access is a new and mature wireless communication technology developed in the spread spectrum communication technology, a branch of digital technology. The principle of CDMA technology is based on the spread spectrum technology. It is about to transmit bandwidth information data with a certain amount of signal. It is modulated with a high-speed pseudo-random code with a bandwidth far greater than the signal bandwidth, the bandwidth of the original data signal is extended and then modulated and sent by the carrier. The acceptor uses identical pseudo-random codes to process the received bandwidth signal. The receiver replaces the bandwidth signal with the narrowband signal of the original information data for de-Scaling to implement information communication. ADSL(Asymetric Digital Subscriber Loop) technology is an asymmetric digital user loop technology that uses an existing pair of telephone copper wires to provide users with asymmetric upstream and downstream transmission rates (bandwidth ), uplink (from the user to the Network) is low-speed transmission, up to 640 Kbps; downlink (from the network to the user) is high-speed transmission, up to 7 Mbps. It was initially developed for the video-on-demand service. With the development of technology, it has gradually become a more convenient broadband access technology, which is valued by the Telecom Department.
Currently, GPRS, CDMA, And ADSL are not only used in various civil fields, but also widely used in industrial fields, convenient access and increasingly low network usage costs are the main reasons for the acceptance of these technologies. Currently, the following industries are used:
L. Industrial remote communication, telemetry, and remote control
2. Monitoring and remote maintenance of unattended stations in the telecom industry (such as mobile base stations, micro-mobile base stations, microwave and optical fiber trunk stations)
3. Urban distribution network automation system and Meter Reading Data Transmission
4. Monitoring of high-voltage power equipment, tap water, gas pipeline, Gates, pumping stations and water plants
5. Real-time Monitoring and maintenance of the Urban Hot Network System
6. Environment Protection System Data Collection
7. Three defenses and hydrological monitoring
8. Monitoring of people's air defense alarm equipment
9. Meteorological Data Collection
10. Other unattended (such as warehouses and office buildings, such as warehouses and office buildings) Monitoring
11. Financial and retail industries
12. Mobile Vehicle Monitoring and Scheduling System
13. Monitoring of tanks and oil pipelines
14. City street lamp monitoring
15. Mobile Office and medical care For detailed application solutions and cases, see typical applications and success stories. |
