Spares planning Page 191 of 544
Option 11C and 11C Mini Technical Reference Guide
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)
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