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Our online glossary is here to help you make sense of the terminology used in the cell phone industry. It covers mobile technologies, such as 3G and 4G, and even includes a bit of information on smartphone operating systems and the companies that make the cell phones and other mobile technology devices we all use.

What is "CSD"?

CSD, or Circuit-Switched Data, was a system used on early GSM networks to provide data access to mobile devices by allowing them to place a data call. CSD was capable of uplink and downlink rates of up to 9.6kbps. Later replaced by the faster HSCSD variant, circuit-switched data on wireless networks were eventually made completely obsolete by packet based networks such as GPRS and EDGE.

Also known as: "Circuit-Switched Data"

See Also: uplink, downlink, kbps, HSCSD, GPRS, EDGE

Referred to by: HSCSD

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