Mtbf (Mean-Time Between Failure) Data - Comdial DX-80 Installation & Maintenance Manual

MTBF (Mean-Time Between Failure) data:

Cabinet Assembly
Power Supply Unit
CPM
408M
DPM8
COM4
APM4
MDM
AAM
Method:
1. Use the figures above for each unit installed (or to be
installed) and calculate the total for this system
configuration.
2. 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.
P7290 IMM
DX-80 I M
NSTALLATION AND AINTENANCE
Mean-Time Between Failure Analysis
System components
1-20
M 03/01
ANUAL
86.0
170.0
2915.7
11407.3
3560.8
6146.5
6860.2
761.0
2337.3
(1 ÷ x)(10 9
) = MTBF hours