40 GBX24 VME 24 Port Gigabit Ethernet Switch
Publication No. GBX24-0HH/2
A.3 Reliability (MTBF)
Table
A
‐
3
shows
the
predicted
values
for
reliability
as
Mean
Time
Between
Failures
(MTBF)
and
failures
per
million
hours
(fpmh).
Table A-3 Reliability (MTBF)
Fail Rate (Failures Per Million Hours)
MTBF (Hours)
Environment
Copper Optical Copper
Optical
Ground Benign 30
°
C
3.43656
3.74538
290 989
266 996
Ground Fixed 40
°
C
10.27869
10.9053
97 289
91 699
Ground Mobile 45
°
C
21.47294
23.13103
46 570
43 232
Naval Sheltered 40
°
C
17.4719
18.55396
57 235
53 897
Naval Unsheltered 45
°
C
35.03249
38.2522
28 545
26 142
Airborne Inhabited Cargo 55
°
C
24.74602
25.8424
40 411
38 696
Airborne Inhabited Fighter 55
°
C
38.93049
40.5793
25 687
24 643
Airborne Uninhabited Cargo 70
°
C
46.50406
49.68857
21 504
20 125
Airborne Uninhabited Fighter 70
°
C 77.13415
80.4129
12 964
12 436
Airborne Rotary Wing 55
°
C
50.08184
53.53211
19 967
18 680
Space Flight 30
°
C
2.91438
3.18804
343 126
313 672
Missile Flight 45
°
C
61.143
16
355
Missile Launch 55
°
C
146.3959
6831
The
predictions
are
carried
out
using
MIL
‐
HDBK
‐
217F
Notices
1
and
2,
parts
count
method.
To
complement
the
217
failure
rates,
some
manufacturers’
data
is
included
where
appropriate;
π
Q
values
have
been
modified
according
to
industry
practice.
