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GPRS Class Type
The class of the device determines the speed at which GPRS can be used.
For example, the majority of GPRS terminals will be able to download data at speeds of up to 24Kbps (kilobytes per second). At the higher end, speeds are theoretically possible up to 171.2 kbit/sec when 8 slots are assigned at the same time to a single user. In reality 40-50Kbps.
PC cards capable of GPRS will send data up to speeds of 48Kbps.
Compare this to current data speeds available:
Type Uplink (Sending) Downlink (Receiving)
GPRS 14 kbps 28-64 kbps
GSM CSD 9.6-14 kbps 9.6-14 kbps
HSCSD 28 kbps 28 kbps
Dial-UP 56 kbps 56 kbps
ISDN Standard 64 kbps 64 kbps
ADSL 256 kbps 512 kbps
Broadband 2 Mbps 2 Mbps
GPRS Multislot Classes
Multislot classes are product dependant, and determine the maximum achievable data rates in both the uplink and downlink directions.
Written as (for example) 3+1 or 2+2, the first number indicates the amount of downlink timeslots (what the mobile phone is able to receive from the network).
The second number indicates the amount of uplink timeslots (how many timeslots the mobile phone is able to transmit).
The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications.