Nortel Networks Option 11C User Manual
Spares planning
Page 191 of 544
Failure rates
The failure rates in Table 58 are for Option 11C system components.
Note: Rates for circuit cards are based on 40°C ambient temperature.
Table 58
Failure rates for Option 11C system components (Part 1 of 2)
Failure rates for Option 11C system components (Part 1 of 2)
NT code
Description
Failure rate per 10
6
hrs.
NTAK02
SDI/DCH circuit card
2.9
NTAK04
AC/DC power supply
3.6
NTAK10
2.0Mb DTI
2.4
NTAK20
clock controller
.54
NTBK22
MISP circuit card
7.66
NTBK50
2.0Mb PRI
3.4
NTBK51
DDCH
1.22
NTDK16
48 port Digital Line Card
1.8
NTDK22
10 m Fiber Daughterboard
2.19
NTDK23
10 m Receiver card
2.15
NTDK24
3 km Fiber Daughterboard
2.19
NTDK25
3 km Receiver card
2.15
NTDK26
Upgrade Daughterboard
0.46
NTDK72
DC power supply
3.6
NTDK78
AC/DC power supply
3.6
NTDK79
3 km Fiber Daughterboard
2.19
NTDK80
3 km Receiver card
2.15
NTDK81
Software Daughterboard
0.83