EES3 Hardware Interface Description
3.4 Automatic GPRS Multislot Class Change
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EES3_HD_v01.100b
Page 40 of 118
2009-08-12
Confidential / Released
3.4
Automatic GPRS Multislot Class Change
Temperature control is also effective for operation in EGPRS Multislot Class 12, EGPRS Mul-
tislot Class 10, GPRS Multislot Class 10 and GPRS Multislot Class 12. If the board temperature
rises close to the limit specified for normal operation (see
for temperature limits)
while data are transmitted over EGPRS or GPRS, the module automatically reverts:
•
from EGPRS Multislot Class 12 (4Tx slots) to EGPRS Multislot Class 10 (2Tx slots),
•
from EGPRS Multislot Class 10 (2Tx slots) to EGPRS Multislot Class 8 (1Tx),
•
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, EES3 returns to the higher Multislot
Class. If the temperature stays at the critical level or even continues to rise, EES3 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
.
