X 8 Module; Mean Time Between Failure Analysis - Vodavi Starplus DHS Technical Manual

DHS Technical Specification Tables
Case Assembly
Power Supply Unit
CPU Module
Standard Music On Hold Module

3 x 8 Module

6-Port CO Line Module
Option Module
Basic Key Telephone
Enhanced Key Telephone
Executive Key Telephone
2-Port CO Module and 2-Port Analog Expansion
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.
Table 2-10: Mean Time Between Failure Analysis
Component MTBF (hr)
100.0
193.0
3095.0
325.7
5744.0
7201.2
2866.0
2988.3
4205.3
4275.3
5000.9
9
(1 ÷ x)(10
) = MTBF hr
2-21