High-speed circuit-switched data (HSCSD), is an enhancement to Circuit Switched Data (CSD), the original data transmission mechanism of the GSM mobile phone system, four to six times faster than GSM, with data rates up to 57.6 kbit/s.
Channel allocation is done in circuit-switched mode, as with CSD. This contrasts with the more widely adopted GPRS. Higher speeds are achieved as a result of superior coding methods, and the ability to use multiple time slots to increase data throughput.
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