363-206-295
Technical Specifications
Issue 1 December 1997 10-41
Table 10-22. DDM-2000 OC-12 Circuit Pack Reliability (Note 1)
Notes
:
1. Calculations are based on Bellcore RPP Issue 4 data. All KS and Lucent components
considered as quality level III. All components evaluated at 40°C ambient and 50
percent electrical stress.
2. FITS is the number of failures per billion hours of operation (10
9
).
* Not available at time of issue.
Table 10-23. DDM-2000 Fan Shelf Steady State Failure Rates (Based on Bellcore RPP
Issue 4 Data)
Circuit Pack
CO RT
FITS (Note 2) MTBF (Years) FITS (Note 2) MTBF (Years)
BBF2B (TGS) 2311 49.40 3467 32.93
BBF4 (TG3) * * * *
BBG8 (SYSCTL) 12806 8.91 19208 5.94
BCP3 (TSI) 2692 42.41 4038 28.27
BCP4 (OHCTL) 19240 5.93 28860 3.96
BBG11 (3DS3) 3144 36.31 4716 24.21
BBG11B (3DS3) 3144 36.31 4716 24.21
BBG12 (3STS1E) 2586 44.14 3879 29.43
21D/21D-U (OLIU) 1599 71.39 2399 47.59
21G-U/21G2-U (OLIU) 6348 17.98 9522 11.99
23G (OLIU) 10029 11.38 15044 7.59
23G-U (OLIU) 9023 12.65 13535 8.43
23H (OLIU) 12836 8.89 19254 5.93
23H-U (OLIU) 11552 9.88 17328 6.59
DDM-2000 Fan Shelf Failures /10
9
hrs. RPP Prediction MTBF (years)
ED-8C733,G8 Fan Shelf 9879* 11.56
ED-8C733-30,G6 Fan Unit 2000 57.08
∗
This includes failure rates for individual fan units.
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