CSD (Circuit Switched Data)

CSD is the usual form of data transmission through circuit switching. Just as with audio transmission on land line based phones, charges are based on the time spent using it.

Maximum transfer rates vary between 9.6kbps and 14.4kbps depending on the mobile phone handset and theservice provider in use.

HSCSD (High Speed Circuit Switched Data) is the same thing as CSD but with an enhanced maximum transfer rate of 43.2kbps.

Also see the HSCSD section.

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