VEGA INSYS Modem GPRS 5.0 - Manual (Page 89)

INSYS GPRS 5.0 serial GPRS General
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Multislot class Downlink slots Uplink slots Active slots
8 4 TS 1 TS 5 TS
9 3 TS 2 TS 5 TS
10 4 TS 2 TS 5 TS
11 4 TS 3 TS 5 TS
12 4 TS 4 TS 5 TS
The maximum possible data rate therefore depends on the multislot class of the
device. The above table shows the available time slots (TS) of a device; the table
below shows the maximum data rate. The data rate, on the other hand, depends
on the used coding scheme (CS). This information is unfortunately not available
for the user. The network providers use different coding schemes according to the
reception situation.
1 TS 2 TS 3 TS 4 TS
CS1 9,05 18,1 27,15 36,2
CS2 13,4 26,8 40,2 53,6
CS3 15,6 31,2 46,8 62,4
CS4 21,4 42,8 64,2 85,6
Data rates of PC data including GPRS control data
1 TS 2 TS 3 TS 4 TS
CS1 8 16 24 32
CS2 12 24 36 48
CS3 14,4 28,8 43,2 57,6
CS4 20 40 60 80
Data rates of PC data only (without GPRS control data)
Note: The above mentioned values represent the theoretically maximum possible
values.
In practice, the following applies:
GPRS will not provide guaranteed data rates or bandwidths for the application.
The values allocated by the network provider (coding scheme and time slots to be
used) can change dynamically during a connection and, among other things, de-
pend on the current amount of connections in the GSM cell.
In the device class B, the INSYS GPRS 5.0 serial supports the GSM services GPRS,
CSD and voice. However, only one service can be executed at a time.