Nortel 4134 설치 설명서
93
Appendix
Hardware reliability
Hardware reliability
This section provides information about the reliability of the Secure Router
4134 hardware. This section uses the following terms:
4134 hardware. This section uses the following terms:
•
failures in time (FIT)—The number of failures for each billion (10
9
)
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.
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.
Router 4134 hardware in terms of FIT and MTBF.
ATTENTION
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.
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
Failure rate
MTBF
Main board
5 107 FITs
195 780 hours
VPN
515 FITs
1 940 558 hours
Fan tray module
8 208 FITs
121 829 hours
Non-PoE 250 W AC power
supply module
supply module
2 181 FITs
458 377 hours
PoE 660 W AC power supply
module
module
8 460 FITs
118 191 hours
250 W DC power supply
module
module
1 389 FITs
719 672 hours
1-port T1/E1 Small Module
370 FITs
2 702 372 hours
2-port T1/E1 Small Module
484 FITs
2 062 556 hours
Nortel Secure Router 4134
Installation — Hardware Components
NN47263-301
01.02
Standard
10.0
7 August 2007
Copyright © 2007, Nortel Networks
.