Qfx5120 Site Electrical Wiring Guidelines; Qfx10000 Rack Requirements; Table 49: Site Electrical Wiring Guidelines - Juniper QFX10008 Hardware Manual

QFX5120 Site Electrical Wiring Guidelines

Table 49: Site Electrical Wiring Guidelines

Site Wiring Factor
Signaling limitations
Radio frequency
interference
Electromagnetic
compatibility

QFX10000 Rack Requirements

Copyright © 2019, Juniper Networks, Inc.
Follow the prescribed electrostatic discharge (ESD) prevention procedures to prevent
damaging the equipment. Static discharge can cause components to fail completely
or intermittently over time.
Install the device in a secure area, so that only authorized personnel can access the
device.
Table 49 on page 119 describes the factors you must consider while planning the electrical
wiring at your site.
WARNING: You must provide a properly grounded and shielded environment
and to use electrical surge-suppression devices.
Guidelines
If your site experiences any of the following problems, consult experts in electrical surge
suppression and shielding:
Improperly installed wires cause radio frequency interference (RFI).
Damage from lightning strikes occurs when wires exceed recommended distances or pass
between buildings.
Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and
electronic devices.
To reduce or eliminate RFI from your site wiring, do the following:
Use a twisted-pair cable with a good distribution of grounding conductors.
If you must exceed the recommended distances, use a high-quality twisted-pair cable with
one ground conductor for each data signal when applicable.
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
The QFX10000 modular switch chassis are designed to be installed in four-post racks.
Rack requirements consist of:
Rack type
Mounting bracket hole spacing
Chapter 2: Site Planning, Preparation, and Specifications
119