Qfx10002 Rack Requirements; Table 31: Site Electrical Wiring Guidelines; Table 32: Rack Requirements For The Qfx10002 - Juniper QFX10002 Hardware Manual

Table 31: Site Electrical Wiring Guidelines

Site Wiring Factor
Signaling limitations
Radio frequency
interference
Electromagnetic
compatibility

QFX10002 Rack Requirements

Table 32: Rack Requirements for the QFX10002

Rack Requirement Guidelines
Rack type: four-post Use a four-post rack that provides bracket holes or hole patterns spaced at 1-U (1.75 in. or 4.45 cm)
increments and that meets the size and strength requirements to support the weight.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document
number EIA-310–D) published by the Electronics Industry Association.
Copyright © 2019, Juniper Networks, Inc.
WARNING: It is particularly important to 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 QFX10002 fixed-chassis is designed to be installed on four-post racks.
Rack requirements consist of:
Rack type
Mounting bracket hole spacing
Rack size and strength
Rack connection to the building structure
Table 32 on page 71 provides the rack requirements and specifications for the QFX10002.
Chapter 2: Site Planning, Preparation, and Specifications
71