4112221
Rev 7.2
June 19, 2013
92
User Guide
Reliability Compliance and
Recommended Standards
14.3.1. 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 FX Series.
Table 77.
ISO Failure Mode Severity Classification
Class
Definition
CLASS A
All equipment/system functions are fulfilled normally (100% functional) during and after the
constraint.
The FX Series shall exhibit normal function during and after environmental exposure. The FX
Series performance shall meet the minimum requirements of 3GPP or appropriate wireless
standards.
CLASS B
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.
The FX Series 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.
CLASS C
No functional requirement will be fulfilled during the application of the constraint; however, full
functionality will automatically be returned after the constraint has been removed.
14.3.2. Reliability Prediction Model
The following tables enumerate the different tests performed on the FX Series and their
corresponding conditions and results.
14.3.2.1.
Life Stress Test
The following tests the
FX Series’ product performance.
Table 78.
Life Stress Test
Designation
Condition
Performance Test
PT3T° & PT
Standard: N/A
Special conditions:
Temperature:
Class A: -20 °C to +55°C
Class B: -30 °C to +75°C
Rate of temperature change: ± 3°C/min
Recovery time: 3 hours
Operating conditions: Powered
Duration: 10 days
