Juniper QFX Series Hardware Guide

Do not connect two sources to a single power supply because doing so
can potentially cause circulating current in feed wires whenever there is
any difference in the voltage of the two sources.
a. Secure the ring lug of the positive (+) DC power source cable to the V+ terminal
on the DC power supply.
b. Secure the ring lug of the negative (–) DC power source cable to the V– terminal
on the DC power supply.
c. Tighten the screws on the power supply terminals until snug using the screwdriver.
Do not overtighten; apply between 5 in-lb (0.56 Nm) and 6 in-lb (0.68 Nm) of
torque to the screws.
Figure 29: DC Power Supply Faceplate for a QFX5110
5
5—1— ESD grounding pointShunt negative input terminals (+RTN)
6—2— Fault LEDShunt positive input terminals (-48V)
7—3— Output LEDTerminal block
8—4— Input LEDEjector lever
CAUTION: The V+ terminals are shunted internally together, as are the
V- terminals. The same polarity terminal can be wired together from the
same source to provide an additional current path in a higher power
chassis. Do not connect the terminals to different sources.
Copyright © 2019, Juniper Networks, Inc.100
QFX5110 Switch Hardware Guide

Juniper QFX Series Specifications

General

Category	Switch
Series	QFX
Form Factor	1U, 2U, and modular chassis options
Power Supply	Redundant, hot-swappable power supplies
Cooling	hot-swappable fans
Virtual Chassis	Supported on certain models
Typical Use	Data center, cloud
Operating System	Junos OS
Management	CLI
Key Features	High performance, low latency, automation
Latency	Sub-microsecond latency
Port Density	Varies by model (e.g., QFX5100: up to 48x10GbE + 6x40GbE)