Mambo Hardware Description
Version 1.01
class 8 (4 RX x 1 TX). This reduces the power consumption and, consequently, causes
the temperature of board to decrease. Once the temperature drops to a value of 5
degrees below the limit of restricted operation, MAMBO returns to the higher Multislot
class 10. If the temperature stays at the critical level or even continues to rise,
MAMBO will not switch back to the higher class. After a transition from Multislot class
10 to Multislot class 8 a possible switchback to Multislot class 10 is blocked for one
minute. Please, note that there is no one single cause of switching over to a lower
GPRS 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
terminal may even switch off.
4.2.1 Automatic
shutdown
Automatic shutdown takes effect if:
•
the MAMBO board is exceeding the critical limits of over or under
temperature.
•
the battery is exceeding the critical limits of over or under temperature.
•
Battery under voltage is detected.
The automatic shutdown procedure is equivalent to the power-down initiated, i.e.
MAMBO logs off from the network and the software enters a secure state avoiding
loss of data.
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