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AC75 Hardware Interface Description
Strictly confidential / Preliminary
3.4
Automatic EGPRS/GPRS Multislot Class Change
Temperature control is also effective for operation in EGPRS Multislot Class 10, GPRS
Multislot Class 10 and GPRS Multislot Class 12. If the board temperature rises close to the
limit specified for normal operation
module automatically reverts:
•
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, AC75 returns to the higher Multislot
Class. If the temperature stays at the critical level or even continues to rise, AC75 will not
switch back to the higher class.
After a transition from EGPRS Multislot Class 10 to EGPRS Multislot Class 8 a possible
switchback to EGPRS Multislot Class 10 is blocked for one minute. The same applies when
a transition occurs from GPRS Multislot Class 12 or 10 to GPRS Multislot Class 8.
Please note that there is not one single cause of switching over to a lower Multislot Class.
Rather it is the result of an interaction of several factors, such as the board temperature that
depends 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 Section 3.3.4.1.
1
See Chapter 5.2 for temperature limits.
AC75_HD_V00.202
1
while data are transmitted over EGPRS or GPRS, the
Page 40 of 120
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27.04.2006
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