Vodavi Starplus DHS - X 8 Module; Mean Time between Failure Analysis

DHS-E Technical Specification Tables 3-13
Table 3-10: Mean Time Between Failure Analysis
Component MTBF (hr)
DHS-E
System 2 (3 x 8) Modules (6 x 16) 72347.9
Case Assembly 109.0
Power Supply Unit 193.0
CPU Module 7399.1
Modem Board 377.0
3 x 8 Module 5744.0
Basic Key Telephone 2988.3
Enhanced Key Telephone 4205.3
Executive Key Telephone 4275.3
2-Port Analog Adapter and 2-Port Analog Expansion 5000.9
DSS Console 1596.7
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