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high speed circuit switched data (HSCSD)

High Speed Circuit Switched Data (HSCSD) is the standard developed by the European Telecommunications Standards Institute (ETSI) for high-speed data communication in GSM networks.

In this standard, a maximum of eight time slots are bundled into a single transmission channel. This results in a total data rate of 76.8 kbit/s for a data transmission rate of 9.6 kbit/s per channel.

If 14.4 kbit/s per time slot is taken as the data transmission rate, which can be achieved with a more efficient error correction method, then this results in a total data rate of 115.2 kbit/s. This value is only achieved if all channels are used for data transmission, so that no more telephone calls can be made. In practice, however, this is likely to remain the exception. The actual offers are likely to be 57.6 kbit/s (4 x 14.4 kbit/s) or 38.4 kbit/s (4 x 9.6 kbit/s). Channel bundling does not have to be symmetrical for the transmit and receive directions; the standard allows separate settings for both traffic directions.

Data transmission rates of HSCSD

Data transmission rates of HSCSD

The HSCSD method has the disadvantage that complete channels are always reserved and therefore a relatively large amount of transmission capacity is available to the individual user.

HSCSD can transmit in the 960 MHz range as well as in the 1.8 GHz range.

With Enhanced Circuit Switched Data (ECSD), there is a technology that combines HSCSD and EDGE and thus ensures significantly higher data rates.

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Englisch: high speed circuit switched data - HSCSD
Updated at: 29.02.2008
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