Juniper MX960 Hardware Manual page 236

Both normal-capacity and high-capacity MX960 chassis with DC power supplies; MX960 chassis with
high-capacity AC power supplies; MX960 high-capacity second-generation AC power supplies; and MX960
high-voltage second-generation universal power supplies are zoned. MX960 chassis with normal-capacity
AC power supplies have one overall zone. Zoning means that certain components are powered by specific
power supplies (see Table 64 on page 135
be sure that there is adequate power for each zone.
Three AC power supplies are mandatory for MX960 chassis with normal-capacity AC power supplies.
Table 91: MX960 Zoning
Chassis Power Configuration
MX960 DC (normal-capacity and high-capacity power
supplies); MX960 AC (high-capacity power supplies;
MX960 AC high-capacity second-generation power
supplies and MX960 high-voltage second-generation
universal power supplies
MX960 DC (normal-capacity and high-capacity power
supplies); MX960 AC (high-capacity power supplies)
and MX960 AC high-capacity second-generation power
supplies; MX960 high-voltage second-generation
universal power supplies
The following sample configuration shows an MX960 chassis with:
Four high-capacity AC power supplies (using two feeds for each power supply); two supplies are active,
two are redundant
Six 16 port 10 GbE MPC with SFP+ interfaces (slots 0 through 5)
Two SCBs with two (redundant) RE-1800x2 routing engines (SCB slot 0 and SCB slot 1)
SCB (SCB slot 6)
Five 16 port 10 GbE MPC with SFP+ interfaces (slots 7 through 11)
High-capacity cooling system (upper and lower fan trays)
NOTE: The high-capacity cooling system satisfies cooling requirements of MPCs, and must
be used for proper cooling.
for information on zoning). When calculating power requirements,
Power
Zone Supply (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
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