363-206-305
Technical Specifications
Issue 3 June 2000
10-61
DDM-2000 FiberReach System Reliability
Predictions
10
Table 10-26 and Table 10-27 show the system reliability predictions for the DDM-
2000 FiberReach Multiplexer.
Table 10-26. DDM-2000 FiberReach System Reliability Prediction.
*
Field replacement rate estimates, based on field CP returns and repairs, are used for the component whose failure
is silent service affecting and/or not service affecting.
Notes:
Environment
Telcordia Technologies
Criteria (Note 3) Prediction (Note 4)
Application (Note 2) Requirement Objective Outage (min/yr) MTBF (Yrs)
Point-to-Point
DS1 to OC-1 CO 1.75 0.25 0.1657 724
DS1 to OC-1(*) CO 1.75 0.25 0.0463 2590
DS1 to OC-1 RT 5.25 0.75 0.4971 482
DS1 to OC-1(*) RT 5.25 0.75 0.1391 1723
DS1 to OC-3 CO 1.75 0.25 0.1657 724
DS1 to OC-3 (*) CO 1.75 0.25 0.0463 2588
DS1 to OC-3 RT 5.25 0.75 0.4972 482
DS1 to OC-3 (*) RT 5.25 0.75 0.1394 1719
DS3 to OC-3 CO 1.75 0.25 0.1983 605
DS3 to OC-3 (*) CO 1.75 0.25 0.0219 5479
DS3 to OC-3 RT 5.25 0.75 0.5953 403
DS3 to OC-3 (*) RT 5.25 0.75 0.0661 3617
Ring Pass-
Through
OC-3c to OC-3c CO none none 0.00006 1554735
OC-3c to OC-3c RT none none 0.00052 345505
OS Interface
TBOS
(Note 5
) CO — 14.00 4.74 25
1.
Hardware failure rates are calculated per the RPP method, TR-NWT-000332, Issue 4,
Reliability
Prediction Procedure
.
2.
The environmental factor for the CO = 1.0 and for the RT = 1.5, per TR-NWT-000332, Issue 4,
Reliability Prediction Procedure
.
(Notes continued on next page)
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