Hardware Reliability - Nortel Secure Router 4134 Installation Manual

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Appendix

Hardware reliability

This section provides information about the reliability of the Secure Router
2330/4134 hardware. This section uses the following terms:
•
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.
The following table provides information for the expected reliability of
Secure Router 4134 hardware in terms of FIT and MTBF.
ATTENTION
Ensure you install the Secure Router 2330/4134 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.
Table 62
Secure Router 4134 reliability
Hardware
Main board
VPN
PVM
Fan tray module
Non-PoE 250 W AC power
supply module
PoE 660 W AC power supply
module
250 W DC power supply
module
Failure rate
5 107 FITs
515 FITs
744 FITs
8 208 FITs
2 181 FITs
8 460 FITs
1 389 FITs
Nortel Secure Router 2330/4134
Installation — Hardware Components
NN47263-301 03.01 7 September 2009
Copyright © 2007-2008 Nortel Networks. All Rights Reserved.
MTBF
195 780 hours
1 940 558 hours
1 344 086 hours
121 829 hours
458 377 hours
118 191 hours
719 672 hours
121
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