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Internet Access Guide : GPRS

Class Downlink Slots Uplink Slots Active Slots
1 1 1 2
2 2 1 3
3 2 2 3
4 3 1 4
5 2 2 4
6 3 2 4
7 3 3 4
8 4 1 5
9 3 2 5
10 4 2 5
11 4 3 5
12 4 4 5

Table: GPRS multi-slot classes

Theoretically, maximum data rate of Internet access over GPRS is 115 kbps that is achieved when all the eight time slots are used for GPRS connection. But that is not the case referring to the available multi-slot classes. Maximum only 5 time slots are allocated for GPRS downlink or uplink at any given time. That's why, the Internet experience using GPRS is like using dial-up Internet access. But when you travel to areas not covered by faster services such as EDGE, EV-DO, HSDPA, or Wi-Fi hotspots, GPRS often becomes the only alternative for your Internet connection.

GPRS device is also classified based on its support for voice and data. They are as follows:

Class A

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The device connects simultaneously to both GPRS and GSM/TDMA. While connecting to the Internet, the device can make and receive a call or a message without disconnecting from the Internet.

Class B

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The device connects to both GPRS and GSM/TDMA, but can use only one service at a time. When making or receiving a call or a message, the Internet connection (GPRS session) is suspended until the call ends.

Class C

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The device connects to one service only, either GPRS or GSM/TDMA. The device must be disconnected from the Internet (GPRS) when making or receiving a call or a message.


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