Hardware Reliability - Nortel Secure 4134 Installation Manual

Appendix

Hardware reliability

This section provides information about the reliability of the Secure Router
4134 hardware. This section uses the following terms:
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The following table provides information for the expected reliability of Secure
Router 4134 hardware in terms of FIT and MTBF.
Ensure you install the Secure Router 4134 and its components correctly and
operate the unit within the intended environment under specified conditions. The
failure rate and MTBF values in the following table do not include failure caused
by software or erroneous human action.
Hardware
Main board
VPN
Fan tray module
Non-PoE 250 W AC power
supply module
PoE 660 W AC power supply
module
250 W DC power supply
module
1-port T1/E1 Small Module
2-port T1/E1 Small Module
Copyright © 2007, Nortel Networks
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failures in time (FIT)—The number of failures for each billion (10
accumulated device hours.
mean time between failures (MTBF)—The average value of the time
intervals between successive outages of the system. This average
value is calculated from, and based on, a large population of nominally
identical items.
Failure rate
5 107 FITs
515 FITs
8 208 FITs
2 181 FITs
8 460 FITs
1 389 FITs
370 FITs
484 FITs
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301 01.02 Standard
10.0 7 August 2007
ATTENTION
MTBF
195 780 hours
1 940 558 hours
121 829 hours
458 377 hours
118 191 hours
719 672 hours
2 702 372 hours
2 062 556 hours
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