High Speed Circuit Switched Data

communications (HSCSD) A planned feature of GSM Phase 2

defining a standard for circuit switched data transmission

over a GSM link at up to 57.6 (78.8?) kbps. This is

achieved by concatenating up to four consecutive GSM

timeslots, each of which is capable of 14.4 kbit/s. It uses

multiplexing and compression or filtering.

The following services toward the fixed network are

supported: V.34 up to 28.8 kbps and V.110 with rate

adaptation up to 38.4 kbps.

HSCSD is aimed at mobile workstation users. As it is

circuit switched, it is suited to streaming applications

such as video conferencing and multimedia. Bursty

applications like electronic mail, are more suited to

packet switched data (as in GPRS).

Ericsson.

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(1999-12-04)