H3C Technologies H3C MSR 50 - Manual (Page 21)

13
PSU
Functions
The power supply system of the MSR 50 can work in either single-power or dual-power mode. In
dual-power mode, the two PSUs (DC-input or AC-input) function in redundancy backup mode. That
means, when a PSU fails or its power supply is disconnected, another PSU can still work and supply all
the power required by the system.
You can connect a PSU to the backplane by inserting it from the rear of the router chassis. It is hot
swappable and its switchover does not affect the ongoing system operation.
NOTE:
•
When installing your router in a communications equipment room, ensure that the AC power
distribution cabinet can provide a lightning protection box or arrester against the current of 20 KA and
above.
• MPU-G2 does not support any PoE power module.
Appearance
Figure 13 AC-input PSU
Figure 14 DC-input PSU
LED
Table 10 PSU LED description
LED Meaning
ALM (red) ON means the PSU is not well-seated or has failed.
RUN (green) Steady ON means the PSU is operating normally, and OFF means the PSU has failed.
AC/DC OK (green)
PSU input LED. Steady ON means the normal voltage is inputting, and OFF means the
opposite.
FAN Module
Functions
The MSR 50-40 is configured with six fans; the MSR 50-60 is configured with eight fans. These fans are
working in pairs and the two fans in each pair are working in redundancy. When all these fans are
working normally, the operating temperature of the system can be maintained between 0°C and 55°C
(32°F to 131°F). As the failure of a fan does not affect the operation of other fans, the normal operating