Juniper QFX Series Hardware Guide

Table 22: Site Electrical Wiring Guidelines (continued)
GuidelinesSite Wiring Factor
If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from
lightning or radio transmitters, seek expert advice.
Some of the problems caused by strong sources of electromagnetic interference (EMI) are:
•
Destruction of the signal drivers and receivers in the device
•
Electrical hazards as a result of power surges conducted over the lines into the equipment
Electromagnetic
compatibility
QFX5110 Chassis Grounding Cable and Lug Specifications
For installations that require a separate grounding conductor to the chassis, the switch
must be adequately grounded before power is connected to ensure proper operation
and to meet safety and electromagnetic interference (EMI) requirements. To ground a
QFX5110, connect a grounding cablewith a grounding lugto earth ground and then attach
it to the chassis grounding points.
NOTE: A groundconnection to the protective earthing terminal is not required
for an AC-powered switch. The AC power cords provide adequate grounding
when you connect the power supply in the switch to a grounded AC power
outlet by using the AC power cord appropriate for your geographical location.
WARNING: The switch is pluggable type A equipment installed in a
restricted-access location. It has a protective earthing terminal provided on
the chassis in addition to the grounding pin of the power supply cord. This
separate protective earthing terminal must be permanently connected to
earth ground for installations that require a separate grounding conductor
to the chassis.
WARNING: To comply with GR-1089 requirements, all intra-building copper
cabling used for SFP+ and QSFP+ ports must be shielded and grounded at
both ends.
CAUTION: Before switch installation begins, a licensed electrician must
attach a cable lug to the grounding cables that you supply. See “Connecting
the QFX5110 to Grounding Cable” on page 92. A cable with an incorrectly
attached lug can damage the switch.
Before connecting the switch to earth ground, review the following information:
•
The grounding lug required is a Panduit LCD10-10A-L or equivalent (not provided). The
grounding lug provided accommodates 14–10 AWG (2–5.3 mm²) stranded wire.
59Copyright © 2019, Juniper Networks, Inc.
Chapter 2: Site Planning, Preparation, and Specifications

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)