Chapter 18: Monitoring Power Supplies
The following sections describe each routing platform power supply location and type:
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M5/M10 Router Power Supplies on page 219
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M7i Router Power Supplies on page 220
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M10i Router Power Supplies on page 221
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M20 Router Power Supplies on page 222
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M40 Router Power Supplies on page 223
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M40e Router Power Supplies on page 224
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M160 Router Power Supplies on page 226
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M320 Router Power Supplies on page 227
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T320 Router Power Supplies on page 228
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T640 Routing Node Power Supplies on page 229
M5/M10 Router Power Supplies
Two load-sharing, isolated power supplies are located at the bottom rear of the M5 and M10 router chassis. The routers use either AC or DC power. Figure 85 shows the
M5 and M10 router power supplies and where they are installed in the chassis.
Figure 85: M5 and M10 Router Power Supplies
M5 and M10 router rear AC power supply DC power supply
Power supply A Power supply B
Understanding Power Supplies !
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JUNOS Internet Software Network Operations Guide: Hardware
When the power supplies are installed and operational, they automatically share the electrical load. If a power supply stops functioning for any reason, the remaining power supply instantly begins providing all the power the router needs for normal functioning and can provide full power indefinitely.
NOTE: Mixing AC and DC power supplies is not supported. The two power supplies must be either both AC or both DC.
When two power supplies are installed, at least one Routing Engine and one FPC must also be installed for both power supplies to power on. In the absence of this minimum load, only one power supply starts. (The router powers on and operates correctly with one power supply, but without the redundancy benefit of having a second power supply installed.)
M7i Router Power Supplies
Two load-sharing, isolated power supplies are located at the bottom rear of the M7i router chassis. The router uses either AC or DC power. Figure 86 shows the M7i router power supplies and where they are installed in the chassis.
When the power supplies are installed and operational, they automatically share the electrical load.
For full redundancy, two power supplies are required. If a power supply stops functioning for any reason, the second power supply instantly begins providing all the power the router needs for normal functioning. The second power supply can provide full power indefinitely.
Figure 86: M7i Router Power Supplies
M7i router rear
AC power supply DC power supply
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Power supply A
Power supply B
NOTE: When two power supplies are installed, at least one Routing Engine and one
FPC must also be installed for both power supplies to power on. In the absence of this minimum load, only one power supply starts. (The router powers on and operates correctly with one power supply, but without the redundancy benefit of having a second power supply installed.)
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Understanding Power Supplies
