HSCSD

HSCSD

    While we are using Mobile GPRS , there would be an [E] or a [G] indicating whether it is using EDGE (Enhanced Data rates for GSM Evolution) (2.5G) or GPRS (General Packet Radio Service)(2G) is used for data transfer . But very rarely do we see an [H]. [H] indicates HCSD

      HSCSD (High Speed Circuit Switched Data) enables data to be transferred more rapidly than the standard GSM (Circuit Switched Data) system by using multiple channels. The maximum number of timeslots that can be used is four, giving a maximum data transfer rate of 57.6 kbps (or 38.4 kbps on a GSM 900 network). HSCSD is more expensive to use than GPRS, because all four slots are used simultaneously - it does not transmit data in packets. Because of this, HSCSD is not as popular as GPRS and is being replaced by EDGE.

        So don't be perplexed if you see an  [H] displayed on your phone while using GPRS. For more details look in the links given below

http://en.wikipedia.org/wiki/General_Packet_Radio_Service

http://www.mobile-phones-uk.org.uk/gprs.htm