Juniper QFX10008 Hardware Manual page 204

QFX10008 Switch Hardware Guide
204
The cable with very high resistance (indicating an open circuit) to chassis ground
is negative (–) and will be installed on the
The cable with very low resistance (indicating a closed circuit) to chassis ground is
positive (+) and will be installed on the
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables.
Install each power cable lug on the DC power input terminal, securing it with the nut
10.
(see Figure 117 on page
of torque to each nut. (Use the 13/32 in. [10 mm] nut driver or socket wrench.)
a. Secure each positive
input terminal.
b. Secure each negative
input terminal.
Each power supply has two independent sets of DC power input terminals (
: and
RTN –48V/–60V INPUT 2: : RTN –48V/–60V
supply must be powered by dedicated power feeds derived from feed
feed . This configuration provides the commonly deployed INPUT 1 / INPUT
INPUT 2
2 feed redundancy for the switch.
–48V
RTN (return) DC power input terminal.
205). Apply between 24 in.-lb (2.7 Nm) and 25 in.-lb (2.8 Nm)
(+) DC source power cable lug to the
DC source power cable lug to the
(–)
(input) DC power input terminal.
and to indicate
(+) (–)
RTN (return) DC power
(input) DC power
–48V
). For feed redundancy, each power
INPUT 1
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INPUT 1:
and