EGS5 Hardware Interface Description
3.4 Automatic GPRS Multislot Class Change
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EGS5_HD_v02.004
Page 41 of 123
2012-02-09
Confidential / Released
3.4
Automatic GPRS Multislot Class Change
Temperature control is also effective for operation in GPRS Multislot Class 10 and GPRS Mul-
tislot Class 12. If the board temperature rises close to the limit specified for normal operation
(see
for limits) while data are transmitted over GPRS, the module automatically re-
verts:
•
from GPRS Multislot Class 12 (4Tx slots) to GPRS Multislot Class 8 (1Tx),
•
from GPRS Multislot Class 10 (2Tx slots) to GPRS Multislot Class 8 (1Tx)
This reduces the power consumption and, consequently, causes the board’s temperature to
decrease. Once the temperature drops by 5 degrees, EGS5 returns to the higher Multislot
Class. If the temperature stays at the critical level or even continues to rise, EGS5 will not
switch back to the higher class.
After a transition from a higher Multislot Class to a lower Multislot Class a possible switchback
to the higher Multislot Class is blocked for one minute.
Please note that there is not one single cause of switching over to a lower Multislot Class. Rath-
er it is the result of an interaction of several factors, such as the board temperature that de-
pends largely on the ambient temperature, the operating mode and the transmit power.
Furthermore, take into account that there is a delay until the network proceeds to a lower or,
accordingly, higher Multislot Class. The delay time is network dependent. In extreme cases, if
it takes too much time for the network and the temperature cannot drop due to this delay, the
module may even switch off as described in
.
