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HighWire HW400c/2 User Reference Guide Rev 1.0
2.7 Mean Time Between Failures (MTBF)
The Mean Time Between Failure (MTBF) of SBE, Inc’s HW400c/2 was
calculated per Telcordia Technical Reference TR-332 Issue 6, December
1997.
The following specific parameters were used:
Prediction method: Method I (Parts count procedure)
Application conditions: Case 1 (<1 hr burn-in, 50% electrical stress)
Environment:
Controlled, fixed, ground (mult. factor = 1.0)
Component quality factors:
Quality level II parts (level I on Rs, Cs and LEDs)
Ambient temperature:
50 C
Calculated MTBF:
>150,000 hours (not including installed PMC or PTMC modules)
October 10, 2006 Copyright 2006, SBE, Inc. Page 6