HSCSD

HSCSD (high-speed circuit switched data)

GSM enhancement enabling data rates of 28 kbps and higher through the combination of multiple time slots. (Cingular)

With High-Speed Circuit Switched Data (HSCSD) you can transmit data at speeds of up to 43.2 kbps which means that data transmissions such as emails, faxes, or downloading files just became easier and faster. (Nokia)

A circuit-linked technology for higher transmission speeds-up to 57 kilobits per second, primarily in GSM systems. (Ericsson)

High-Speed Circuit-Switched Data (HSCSD), is an enhancement to Circuit Switched Data, the original data transmission mechanism of the GSM mobile phone system. As with CSD, channel allocation is done in circuit switched mode. The difference comes from the ability to use different coding methods and/or multiple time slots to increase data throughput.

CSD (Circuit Switched Data)

CSD allows a user to use their wireless handset as a modem for laptops, PDAs and other electronic devices via infrared ports or designated data cables. CSD also allows a user to access Wireless Internet via their wireless handset (handset must be WAP compatible). (Cingular)

Circuit Switched Data, often referred to as CSD, is the original form of data transmission developed for the TDMA-based mobile phone systems like GSM. CSD uses a single radio time slot to deliver 9.6 Kbits/sec data transmission to the GSM Network and Switching Subsystem where it could be connected through the equivalent of a normal modem to the PSTN allowing direct calls to any dial up service. As of 2006, some GSM-based service providers, Cingular et al, still provide CSD by request.