Juniper Networks MX960 Benutzerhandbuch

DC Power Supply

In the DC power configuration, the router contains either two or four DC power
supplies (see Figure 1 on page 2), located at the lower rear of the chassis in
slots 

PEM0

 through 

PEM3

 (left to right). You can upgrade your DC power system from

two to four power supplies. The DC power supplies in slots 

PEM0

 and 

PEM2

 provide

power to the lower fan tray, DPC slots 

6

 through 

11

, and SCB slots 

1

 and 

2

. The DC

power supplies in slots 

PEM1

 and 

PEM3

 provide power to the upper fan tray, DPC

slots 

0

 through 

5

, and SCB slot 

0

.

Four power supplies provide full redundancy. If a DC power supply fails, its redundant
power supply takes over without interruption.

Each DC power supply has a single DC input (–48 VDC and return) that requires a
dedicated 80 A (–48 VDC) circuit breaker for the maximum router hardware
configuration. For information about site power preparations and connecting the
router to power and ground, see the MX960 Ethernet Services Router Hardware Guide.

For DC power supply and power system electrical specifications, see Table 1 on page 
3 and the MX960 Ethernet Services Router Hardware Guide.

Figure 1: DC Power Supply

Table 1 on page 3 lists the DC power supply electrical specifications. For DC power
system electrical specifications, see the MX960 Ethernet Services Router Hardware
Guide.

2

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DC Power Supply

MX960 Ethernet Services Router DC Power Supply Installation Instructions