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Rev 6.1
January 28, 2019
47
8. Reliability Compliance and
Recommendations
8.1.
Environmental Specifications
The modem is compliant with the following operating classes. The table below lists the ideal
temperature range of the environment.
Table 30.
Operating Class Temperature Range
Conditions
Temperature Range
Operating/Class A
-20 °C to +55°C
Operating/Class B
-30 °C to +75°C
Storage
-40 °C to +80°C
8.1.1.
Function Status Classification
The classes reported below comply with the Annex “ISO Failure Mode Severity Classification”, ISO
Standard 7637, and Section 1.
Note:
The word “function” as used here concerns only the function performed by the modem.
Table 31.
ISO Failure Mode Severity Classification
Class
Definition
CLASS A
The modem remains fully functional during and after environmental exposure; and shall meet
the minimum requirements of 3GPP or appropriate wireless standards.
CLASS B
The modem remains fully functional during and after environmental exposure; and shall exhibit
the ability to establish a voice, SMS or DATA call at all times even when one or more
environmental constraint exceeds the specified tolerance. Unless otherwise stated, full
performance should return to normal after the excessive constraint(s) have been removed.
