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TC65 JAVA User's Guide
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TC65 JAVA User's Guide_V05
Page 33 of 90
26.09.2005
5.9.3.3.2 Download
The data rate for downloading data over GPRS depends on the number of assigned
timeslots and the coding schemes given by the net. Since TC65 supports GPRS class 12,
the number of assigned timeslots can be up to 4. For the measurements, the Java
application receives data from the server over GPRS and sends them over RS232 to an
external device.
GP
RS
co
nn
ec
tio
n
do
wn
loa
d d
ata
TC65
Java
application
(transfer data)
AS
C1
Figure 16: Scenario for testing data rates on ASC1 with GPRS data download
The tables below show the download data rates that can be achieved if hardware flow control
is enabled on the CommConnection interface and the port speed is set to 230400.
Table 3: Download data rate with different number of timeslots, CS2
Download data rate with x timeslots
Coding scheme 2
[kbit/s]
1
timeslot
theor.
Value *
% from
theor.
Value
2
time-
slots
theor.
Value *
% from
theor.
Value
3
time-
slots
theor.
Value *
% from
theor.
Value
4
time-
slots
theor.
Value *
% from
theor.
Value
11
12 91%
21
24
87%
29
36
81%
35
48
73%
* net transmission rates for LLC layer
Table 4: Download data rate with different number of timeslots, CS4
Download data rate with x timeslots
Coding scheme 4
[kbit/s]
1
timeslot
theor.
Value *
% from
theor.
value
2
time-
slots
theor.
Value *
% from
theor.
value
3
time-
slots
theor.
Value *
% from
theor.
value
4
time-
slots
theor.
Value *
% from
theor.
value
17
20
85%
31
40
78%
35
60
58%
38
80
48%
* net transmission rates for LLC layer