Rack Requirements; Table 40: Rack Requirements And Specifications - Juniper EX9214 Hardware Manual

EX9214 Switch Hardware Guide
Table 39: Site Electrical Wiring Guidelines (continued)
Site Wiring Factor
Radio frequency
interference
Electromagnetic
compatibility
Related
Documentation

Rack Requirements

Table 40: Rack Requirements and Specifications

Rack Requirement
Rack type
Mounting bracket hole spacing
90
Guidelines
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
General Safety Guidelines and Warnings on page 299
General Electrical Safety Guidelines and Warnings on page 327
Prevention of Electrostatic Discharge Damage on page 329
You can mount the device on two-post racks or four-post racks.
Rack requirements consist of:
Rack type
Mounting bracket hole spacing
Rack size and strength
Rack connection to the building structure
Table 40 on page 90 provides the rack requirements and specifications.
Guidelines
You can mount the device on a rack that provides bracket holes or hole patterns spaced
at 1 U (1.75 in. or 4.45 cm) increments and meets the size and strength requirements to
support the weight.
A U is the standard rack unit defined by the Electronics Industry Association.
The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so that the
device can be mounted in any rack that provides holes spaced at that distance.
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