Juniper PTX10008 Hardware Manual page 66

NOTE: DC power supplies are shipped only in the redundant configuration of PTX10000 routers.
For details about different chassis configurations, see
on page 35 and PTX10016 Components and Configurations.
Each JNP10K-PWR-DC power supply weighs approximately 6 lb (2.7 kg) and has two independent pairs
of DC input lugs (Input 1, RTN, –48V/–60V and Input 2, RTN, –48V/–60V) on the faceplate of the power
supply. Each inlet requires a dedicated DC power feed. Although each inlet provides sufficient input power
to provide full output, always connect to a dedicated DC power feed to provide redundancy. Only one
power feed is operational at a time.
DC power models employ electronic A-B input selection. It provides 2n source redundancy and n+1 power
supply redundancy using fewer power supplies than you would require in a 2n configuration. Should one
power source fail, electronic A-B input selection routes the power supply to the alternate source.
Each JNP10K-PWR-DC power supply has a power switch with international markings for on (|) and off
(O), a fan, and four LEDs on the faceplate that indicate the status of the power supply. See
Figure 31 on page 67.
Figure 31: JNP10K-PWR-DC Power Supply
"PTX10008 Components and Configurations"
67