Proper noun
HSCSD
(communication, electronics) Initialism of Highspeed Circuit Switched Data (2.5G).
In addition to GPRS, there are two other GSM technologies which deliver data services: circuit-switched data (CSD) and high-speed circuit-switched data (HSCSD). Source: Internet
Some applications such as video calling may prefer HSCSD, especially when there is a continuous flow of data between the endpoints. Source: Internet