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In the previous examples, we calculated that a PTX10004 AC system requires 8325 W with three
PTX10K-LC1201-36CD line cards. In this example, we calculate the total power available for
JNP10K-PWR-AC2 power supplies set for dual feed and low power in a PREM2 configuration:
= (8325 W) / (3000 W) dual input, low power
= 2.78
Round up the result to three JNP10K-PWR-AC power supplies. A PREM2 redundant AC system then
has sufficient power supplies.
3. Calculate how much power the power supplies need. To determine the power required, multiply the
number of power supplies by the power supply wattage and divide by the efficiency of the power
supply. The efficiency rate accounts for the loss of energy within the power supply and is 89 percent
for power supplies running in PTX10004 routers.
JNP10K-PWR-AC2 Power Specifications
The JNP10K-PWR-AC2 power supply supports AC, high-voltage alternating current (HVAC), and
high-voltage direct current (HVDC).
Table 35 on page 95
lists the power specifications for the AC power supply (JNP10K-PWR-AC2) used in
a PTX10004 chassis.
Table 35: Power Specifications for a JNP10K-PWR-AC2 Power Supply
Specification
AC input voltage
DC input voltage
Input current rating
DC output power
Table 36 on page 96
shows the physical specifications for a JNP10K-PWR-AC2 power supply.
Value
180–305 VAC
190–410 VDC
28.5 A
12.3 V, 5500 W with dual feed and 5000 W with single feed
95
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