Juniper QFX10016, Hardware Manual

Page: 81 / 439

CAUTION: Before you begin installing the switch, ensure that a licensed electrician has
attached an appropriate grounding lug to the grounding cable that you supply. Using a
grounding cable with an incorrectly attached lug can damage the switch.
NOTE: QFX10000-PWR-DC power supplies are shipped only in the redundant configuration of
QFX10000 switches. For details about different chassis configurations, see
QFX10008
Configurations and Upgrade Options
and "QFX10016 Components and Configurations" on page
18 .
Each QFX10000-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 2
n source redundancy and n+1
power supply redundancy using fewer power supplies than you would require in a 2 n configuration.
Should one power source fail, electronic A-B input selection switches the power supply to the alternate
source.
70