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

DHS-E Technical Specification Tables
Component
DHS-E
System 2 (3 x 8) Modules (6 x 16)
Case Assembly
Power Supply Unit
CPU Module
Modem Board

3 x 8 Module

Basic Key Telephone
Enhanced Key Telephone
Executive Key Telephone
2-Port Analog Adapter and 2-Port Analog Expansion
DSS Console
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 3-10: Mean Time Between Failure Analysis
MTBF (hr)
72347.9
109.0
193.0
7399.1
377.0
5744.0
2988.3
4205.3
4275.3
5000.9
1596.7
9
(1 ÷ x)(10
) = MTBF hr
3-13