363-206-285
Technical Specifications
Issue 3 June 2001
10-75
DDM-2000 OC-3 System Reliability Predictions 10
Example:
The unavailability of one 2-way DS3 channel within one DDM-2000 OC-3 system configured
to multiplex DS3 to OC-3, located in an uncontrolled environment, is 0.0662 minutes per year
(that is, fraction of time per year when the DS3 channel is unavailable). The mean time
between outage of the DS3 channel is 3608 years (that is, average length of time until a DS3
outage occurs).
Notes
:
1. Hardware failure rates are calculated per the RPP method, TR-NWT-000332, Issue 6,
"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."
Table 10-30. DDM-2000 OC-3 System Reliability Prediction (Note 1)
Application
Environment
(Note 2)
TelcordiaCriteria(Note3)
Prediction
(Outage, min/yr)
MTBF
Years
(Note 4)Requirement Objective
DS1 to OC-3
DS1 to OC-3
CO
RT
1.75
5.25
0.25
0.75
0.0464
0.1395
2587
1716
DS3 to OC-3
DS3 to OC-3
CO
RT
1.75
5.25
0.25
0.75
0.0219
0.0662
5474
3608
OC-3 to OC-3
OC-3 to OC-3
CO
RT
1.75
5.25
0.25
0.75
0.00013
0.00115
706329
16,120
EC-1 to OC-3
EC-1 to OC-3
CO
RT
1.75
5.25
0.25
0.75
0.0220
0.0665
5452
3589
DS1 to EC-1
DS1 to EC-1
CO
RT
1.75
5.25
0.25
0.75
0.0647
0.1944
1853
1233
DS1 to OC-1
DS1 to OC-1
CO
RT
1.75
5.25
0.25
0.75
0.0464
0.1396
2585
1714
OC-1 to OC-3
OC-1 to OC-3
CO
RT
1.75
5.25
0.25
0.75
0.00015
0.00131
617467
137227
DS1 to OC-12
DS1 to OC-12
CO
RT
1.75
5.25
0.25
0.75
0.0464
0.1395
2587
1717
OC-12toOC-12
OC-12toOC-12
CO
RT
4.373
13.118
27
18
OS Interface
TBOS
OS Interface
TL1/X.25
CO
CO
14.00
14.00
8.97
8.97
13
13
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