MC55i Terminal Hardware Interface Description
4.2 Operating Temperatures
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MC55i_Terminal_HD_v01.201a Page 34 of 47 2010-04-16
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4.2 Operating Temperatures
If the terminal board temperature rises close to the limit specified for normal operation, while
data is transmitted over GPRS, the module automatically reverts from GPRS Multislot Class 10
(2Tx slots) to GPRS Multislot Class 8 (1Tx). This reduces the power consumption and, conse-
quently, causes the board’s temperature to decrease. Once the temperature drops by 5 de-
grees, the module returns to the higher Multislot Class.
Table 15: Ambient operating temperature of MC55i Terminal according to IEC 60068-2 (w/o forced air circulation)
Parameter Min Max Unit
Normal operation -20 +65 °C
Restricted operation
1
1.
Restricted operation according to 3GPP TS 45.005 V6.7.0 (2004-11), Annex D, D.2.1, Temperature
(GSM 400, GSM 900 and DCS 1 800): “Outside this temperature range the MS, if powered on, shall not
make ineffective use of the radio frequency spectrum. In no case shall the MS exceed the transmitted
levels as defined in 3GPP TS 45.005 for extreme operation.”
-20 to -30 +65 to +75 °C
Automatic thermal shutdown
2
3
2.
When an emergency call is in progress automatic thermal shutdown is deferred. See also Section 3.5.5.
3.
Due to temperature measurement uncertainty, a tolerance of ±3°C on these switching thresholds may
occur.
<-30 >+75 °C
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