Juniper EX3300, Руководство по оборудованию, Страница: 80 / 272

Table 33: Site Electrical Wiring Guidelines (continued)
Guidelines Site Wiring Factor
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.
Radio frequency interference
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
Related
Documentation
General Safety Guidelines and Warnings on page 199
•
•
General Electrical Safety Guidelines and Warnings on page 229
•
Prevention of Electrostatic Discharge Damage on page 231
Chassis Physical Specifications for EX3300 Switches
The EX3300 switch chassis is a rigid sheet-metal structure that houses the hardware
components.
Table 5 on page 9 summarizes the physical specifications of the EX3300
switch chassis.
Table 34: Physical Specifications of the EX3300 Switch Chassis
Value Description
1.75 in. (4.45 cm) Chassis height
•
17.5 in. (44.5 cm)
• 19 in. (48.2 cm) with mounting brackets attached
Chassis width
12 in. (30.5 cm) Chassis depth
• EX3300-24T: 10 lb (4.6 kg)
• EX3300-24P: 11.6 lb (5.3 kg)
• EX3300-24T-DC: 9.8 lb (4.5 kg)
• EX3300-48T: 10.8 lb (4.9 kg)
• EX3300-48T-BF: 10.8 lb (4.9 kg)
• EX3300-48P: 12.8 lb (5.8 kg)
Weight
Copyright © 2016, Juniper Networks, Inc. 58
EX3300 Switch Hardware Guide