High-Capacity Second-Generation Ac Power Supplies - Juniper MX960 Hardware Manual

Table 64: Zoning for High-Capacity Power Supplies in an MX960
Chassis Power Configuration
MX960 AC high-capacity power
supplies
MX960 AC high-capacity power
supplies

High-Capacity Second-Generation AC Power Supplies

The MX960 can also be powered by four high-capacity second-generation AC power supplies. The
high-capacity second-generation power supplies must be installed in adjacent slots in the chassis. They
can operate in either one-feed mode or two-feed mode. The maximum inrush current per feed for a
high-capacity AC power supply is 38 A per feed at 264 VAC.
In one-feed mode, the power supplies provide power at a reduced capacity (2000 W). In two-feed mode,
the power supplies provide power at full capacity (4100 W). To operate the MX960 at full capacity, you
must use the two-feed mode. High-capacity second-generation AC power supplies require one power
cord per feed. Therefore, to operate the MX960 at full capacity, you need four power cords.
Each high-capacity second-generation AC power supply accepts two AC feeds in two C19/C20 AC
receptacles, both receptacle located on the power supply. Do not use the receptacle located on the chassis.
When using the high-capacity second-generation AC power supplies in one-feed mode, plug one end of
the power cord into the corresponding AC receptacle directly on the power supply and the other end into
a AC outlet. When using the high-capacity second-generation AC power supply in two-feed mode, you
need two power cords. Plug both power cords into the AC receptacles on the power supply the other ends
of the cable into AC outlets.
In high-capacity second-generation AC power supply configurations, there are two zones that provide
power to specific components in the MX system. Redundancy is 1+1 per
the components that receive power for each zone in a high-capacity AC power supply configuration.
Power Supply
Zone (PEM)
Zone 0 PEM 0 or 2
Zone 1 PEM 1 or 3
Components Receiving Power
Lower fan tray
DPC/MPC slots 6 through 11
SCB slots 1 through 2
Upper fan tray
DPC/MPC slots 0 through 5
SCB slot 0
zone.Table 64 on page 135
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