Dealing adequately with technical uncertainties

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MTBF calculation with Telcordia SR-332
  MTBF-Calculation acc. to Standards
       Mil-HDBK-217
    
  Telcordia SR-332
    
  IEC-TR-62380
    
  Siemens SN 29500
    
  FIDES 2009
    
  217Plus
    
  GJB/Z 299C

Telcordia SR-332 was the second electronic reliability prediction standard (after Mil-HDBK-217) and is still the second most popular of all current electronic reliability prediction standards.
With its latest edition (issue 4) from 2016, Telcordia has undergone by far the most revisions and is therefore the oldest
electronic reliability prediction standard; it has been consistently kept up to date for many decades:
Originally named Bellcore issue 1,2,3,4,5 and 6, then hcanged into Telcordia issue 1,2 3 and 4.


The Telcordia methodology is quite similar to the Mil-HDBK-217 methodology, however it tends to be simpler. In contrast to Mil-HDBK-217, Telcordia uses only up to 2 component specific parameters per component type. Aditionally, these 2 parameters are easier to determine (with the # of transistors or gates in ICs being the only exception). Similar methodology makes it quite easy to transform Mil-HDBK-217 MTBF values into Telcordia MTBF values (and vice versa), provided that a reliability prediction software is used.


Telcordia environment types are identical with Mil-HDBK-217 environment types, but Mil-HDBK-217 offers more environment types. The same is true for component coverage: Telcordia uses the same component categories like Mil-HDBK-217, but Mil-HDBK-217 offers more component categories.

Telcordia has some unique differentiators:
Taking into consideration every known aspect, Telcordia is probably the best available standard of all electronic reliability prediction standards.

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