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DX-120 Installation and Maintenance Manual
O
VERVIEW
Specifications
(continued)
MTBF (M
EAN
-T
IME
B
ETWEEN
F
AILURE
) D
ATA
Mean-Time Between Failure Analysis
System Components
Cabinet Assembly
86.0
Power Supply Unit
170.0
CPM
2,915.7
408M
11,407.3
DPM8
3560.8
DPM16
121,654.5
COM4
6,146.5
APM4
6,860.2
MDM
761.0
AAM
2,337.3
T1
318,076.27
ISDN (T1/PRI)
257,340.64
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 ³ )x(109) = MTBF hours
Summary of Contents for comdial DX-120
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