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Reference Guide
8.3.1.
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" used here only concerns the function performed by the modem.
Table 39.
ISO Failure Mode Severity Classification
Class
Definition
All equipment/system functions are fulfilled normally (100% functional) during and after the
constraint.
CLASS A
The modem shall exhibit normal function during and after environmental exposure. The
modem performance shall meet the minimum requirements of 3GPP or appropriate wireless
standards.
All equipment/system functions are fulfilled normally during application of the constraint;
however, one or several of them may be out of the specified tolerances. After application of the
constraint, all functions automatically return within standard limits. The memories shall remain
in compliance with Class A.
CLASS B
The modem shall exhibit the possibility at all times to establish a voice, SMS or DATA call.
Unless otherwise stated, full performance should return to normal after the external influence
has been removed.
No functional requirement will be fulfilled during the application of the constraint; however, full
CLASS C
functionality will automatically be returned after the constraint has been removed.
Rev 1.0
Reliability Compliance and
Recommended Standards
1/27/14
52
52
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