
VIPer808 Specifications A-4
A.03 MTBF (MEAN TIME BETWEEN FAILURES)
The reliability analysis performed on the VIPer808 reflects all available options and has
resulted in the following predicted reliability:
TABLE A-3:
Reliability Prediction
Board
Configuration
Basic Board
Ethernet Interface
10Base 2
Ethernet Interface
10Base-T
Video Memory
512KB
1MB
512KB
1MB
512KB
1MB
CPU Type
MTBF (hour) /
Failure Rate (x10
-6
)
MTBF (hour) /
Failure Rate (x10
-6
)
MTBF (hour) /
Failure Rate (x10
-6
)
486DX33 5V
(INTEL)
140570
7.1139
139169
7.1855
130121
7.6851
128920
7.7567
132655
7.5384
131407
7.6100
486DX2-66 5V
(INTEL)
125359
7.9771
124243
8.0487
116982
8.5484
116010
8.6200
119025
8.4016
118020
8.4732
486DX4-100 3.3V
(INTEL)
137515
7.2719
136174
7.3435
127499
7.8432
126346
7.9148
129931
7.6964
128733
7.7680
486DX2-66 3.45V
(AMD)
160330
6.2371
158510
6.3087
146878
6.8084
145349
6.8800
150114
6.6616
148518
6.7332
486DX4-100 3.45V
(AMD)
150551
6.6423
148945
6.7139
138629
7.2135
137266
7.2851
141508
7.0667
140089
7.1383
5X86-133 3.45V
(AMD)
134686
7.4247
133399
7.4963
125064
7.9959
123954
8.0675
127402
7.8491
126251
7.9207
The MTBF is estimated using the prediction data from MIL-HDBK-217F, Reliability
Prediction of Electronic Equipment (Dec. 1991).
The VIPer808 board is considered functioning in a Ground Fixed environment as defined
in MIL-HDBK-217F. The calculations are performed at 20
°
C with a temperature rise of
10
°
C which is due to heat dissipated by active components.
It is assumed that only one failure at a time can occur and that the failure of any
component will result in the system becoming inoperative or, as a minimum, resulting in
a degraded mode of operation requiring repair action. All components are considered as
having an exponential distribution of time to failure, with a constant failure rate. A failure
rate is attributed to each component called in the parts list, according to the stress levels it
is submitted during normal operation.
Содержание VIPer808
Страница 21: ...Installing Memory 2 3 DIAGRAM 2 1 Assembly Top...
Страница 22: ...Installing Memory 2 5 DIAGRAM 2 2 Assembly Bottom...
Страница 26: ...Setting Jumpers 3 3 DIAGRAM 3 1 VIPer808 Jumper Locations with Default Settings...
Страница 28: ...Setting Jumpers 3 6 TABLE 3 1a Jumper Settings W1 W4 W13 W14...
Страница 29: ...Setting Jumpers 3 7 TABLE 3 1b AMD DX2 DX4 CPU Jumper Settings W1 W15 W15C...
Страница 30: ...Setting Jumpers 3 8 TABLE 3 1c AMD 5x86 CPU Jumper Settings W1 W15 W15C...
Страница 31: ...Setting Jumpers 3 9 TABLE 3 1d Intel CPU Jumper Settings W1 W15 W15C...
Страница 32: ...Setting Jumpers 3 10 TABLE 3 1e SGS CPU Jumper Settings W1 W15 W15C...
Страница 33: ...Setting Jumpers 3 11 TABLE 3 1f Jumper Settings W18 W20 W23...
Страница 92: ...Memory I O Maps B 1 APPENDIX B MEMORY I O MAPS B 01 MEMORY MAPS DIAGRAM B 1 Memory Map Diagram...
Страница 96: ...Mechanical Layout Block Diagram C 3 DIAGRAM C 1 Mechanical Specifications...