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.
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.