Juniper MX10004 - Page 104

Table 36: Power Voltage Sengs for JNP10K-PWR-AC2 and JNP10K-PWR-DC2 Power Supplies
(Connued)
INP0 (Switch 1) INP1 (Switch 2) H/L (High-Input/
Low-Input Switch 3)
Output Power
On O On (High 80 A) 2750 W
O On On (High 80 A) 2750 W
On O O (Low 60 A) 2200 W
O On O (Low 60 A) 2200 W
NOTE: If any JNP10K-PWR-AC2 power supply is set to 20 A, then the power budget for all
power supplies installed in the system becomes 20 A, regardless of whether other power
supplies are set at 30 A. This design is to prevent overloading of the power supply that is set
to 20 A. See Table 50 on page 151 for details on seng the DIP switches.
2. Determine the total power required for your conguraon with line cards installed. The total power
available to the chassis is calculated by dividing the waage needed by the power rang, and then
rounding up.
In the previous examples, we calculated that an MX10004-PREMIUM system requires 10082 W with
four MX10K-LC9600 line cards. In this example, we calculate the total power available for two
JNP10K-PWR-AC2 power supplies set for dual feed and low power in an MX10004-PREMIUM
conguraon:
10082 W (premium system) / 3000 W (6000 W total, 3000 per device) = 3.36
Round up the result to three JNP10K-PWR-AC power supplies. An MX10004-PREMIUM redundant
AC system then has a sucient number of power supplies.
3. Calculate how much power the power supplies need. To determine the power required, mulply the
number of power supplies by the power supply waage that each supply requires. Then, divide by
the eciency of the power supply. The eciency rate accounts for the loss of energy within the
power supply and is 89 percent for power supplies running in MX10004 routers.
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