DHS Technical Specification Tables 2-21
Table 2-10: Mean Time Between Failure Analysis
Component MTBF (hr)
Case Assembly 100.0
Power Supply Unit 193.0
CPU Module 3095.0
Standard Music On Hold Module 325.7
3 x 8 Module 5744.0
6-Port CO Line Module 7201.2
Option Module 2866.0
Basic Key Telephone 2988.3
Enhanced Key Telephone 4205.3
Executive Key Telephone 4275.3
2-Port CO Module and 2-Port Analog Expansion 5000.9
Method:
Use the figures above for each unit installed (or to be installed)
and calculate the total for this system configuration.
Use the total from Step 1 in place of the variable x in the formula
at the right to calculate MTBF for this system configuration.
(1 ÷ x)(10
9
) = MTBF hr
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