Mobile Data - Circuit Switched Data (CSD)
This was the original data format used on cellular networks and simply described means that
the user makes a phone call, but rather that relay voice, data signals are passed from
"end-to-end"; like a phone call the user pays for the duration of the call.
All GSM mobile networks support data. Quite reasonably, few people are aware that
during a call on a mobile phone, the handset is only transmitting or receiving your call for
1/8th of the time.
To increase the capacity on each precious radio channel, all GSM networks use this TDMA signaling to
divide each channel into 8 time slots to carry calls.
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