Automatic Gprs Multislot Class Change - Siemens TC65 Hardware Interface Description
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TC65 Hardware Interface Description
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3.4
Automatic GPRS Multislot Class Change
Temperature control is also effective for operation in GPRS Multislot Class 10 and GPRS
Multislot Class 12. If the board temperature increases to the limit specified for restricted
operation
1)
while data are transmitted over GPRS, the module automatically reverts:
•
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 to a value of 5 degrees below the limit of restricted
operation, TC65 returns to the higher Multislot Class. If the temperature stays at the critical
level or even continues to rise, TC65 will not switch back to the higher class.
After a transition from GPRS Multislot Class 12 or 10 to GPRS Multislot Class 8 a possible
switchback to GPRS Multislot Class 12 or 10 is blocked for one minute.
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 3.3.3.1.
1)
See Table 16 for temperature limits known as restricted operation.
TC65_HD_V00.521
Page 35 of 99
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24.05.2005
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