Circuit Switched Data
Glossary Page
The CSD service (Circuit Switched Data) is a data transmission service available in GSM networks. This service operates on a circuit-switched network at a rate of 9.6 kbit/s and is distinguished by its low bit error rate, which is achieved through the use of special radio protocols and advanced error correction techniques. A flawless radio connection between the mobile phone or radio modem and the base station is essential for the CSD service to function without errors. Faulty radio connections can reduce the relatively low data rate and increase the likelihood of errors.
http://www.itwissen.info/definition/lexikon/circuit-switched-data-CSD.html
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