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WA_DEV_FEX20_UGD_002 Rev 002 April 26, 2010 113
Fastrack Xtend User Guide
Reliability Standards: Compliance and
Recommendations
16.3.1. 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 Fastrack Xtend.
Table 80: ISO Failure Mode Severity Classification
Class Definition
CLASS A
All equipment/system functions are fulfilled normally (100% functional) during and after the
constraint.
The Fastrack Xtend shall exhibit normal function during and after environmental exposure. The
Fastrack Xtend 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 Fastrack Xtend 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.
16.3.2. Reliability Prediction Model
The following tables enumerate the different tests performed on the Fastrack Xtend and their
corresponding conditions and results.
16.3.2.1. Life Stress Tests
The following tests the Fastrack Xtend ‟ s product performance.
Table 81: Life Stress Tests
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