Juniper Networks 5000 SERIES - Manuel (Page 14)

Chapter 1 Overview
6 User’s Guide
NetScreen-5200 Power Recommendations
Although the NetScreen-5200 can run with one power supply, it is advisable to install
both. This practice minimizes the likelihood of system failure due to individual power
supply failure.
When either power supply fails, the Alarm LED on the management module glows red. If
both are operational, the Alarm LED is off. For more information on power supply LEDs,
see Appendix B,
Port Descriptions and LED Status .
NetScreen-5400 Power Recommendations
When the NetScreen-5400 contains only two modules, it can operate with one power
supply. However, if the system contains three or four modules, the system requires at
least two power supplies. In either case, it is advisable to install all three power supplies.
This practice minimizes the likelihood of system failure due to individual power supply
failure.
When any power supply fails, the Alarm LED on the management module glows red.
While all three are operational, the Alarm LED is off. For more information on power
supply LEDs, see Appendix B,
Port Descriptions and LED Status .
The DC Power Supply
The DC power supply weighs about three pounds. The faceplate contains a power LED, a
power switch, a cooling fan vent, and three DC power terminal blocks that connect to
power cables.
The figure below shows the NetScreen-5200 DC power supply.
Thumbscrew
Power
LED
DC Power
Terminal
Blocks
Power Switch
Grounding
Screw