Site Electrical Wiring Guidelines For Juniper Networks Devices; Distance Limitations For Signaling; Radio Frequency Interference; Electromagnetic Compatibility - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Site Electrical Wiring Guidelines for Juniper Networks Devices

Distance Limitations for Signaling

Radio Frequency Interference

Electromagnetic Compatibility

426

Figure 239: T640 DC Power and Grounding Cable Lug

The grounding cable must be 4-AWG (21.2 mm
the local code.
T640 Chassis Description on page 13
Connecting the T640 Grounding Cable on page 133
T640 Preventing Electrostatic Discharge Damage on page 386
General Electrical Safety Warnings for Juniper Networks Devices on page 405
Distance Limitations for Signaling on page 426
Radio Frequency Interference on page 426
Electromagnetic Compatibility on page 426
Improperly installed wires can emit radio interference. In addition, the potential for damage
from lightning strikes increases if wires exceed recommended distances or if wires pass
between buildings. The electromagnetic pulse (EMP) caused by lightning can damage
unshielded conductors and destroy electronic devices. If your site has previously
experienced such problems, you might want to consult experts in electrical surge
suppression and shielding.
You can reduce or eliminate the emission of radio frequency interference (RFI) from your
site wiring by using 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, you might want to seek expert advice.
Strong sources of electromagnetic interference (EMI) can destroy the signal drivers and
receivers in the network device and conduct power surges over the lines into the
equipment, resulting in an electrical hazard. It is particularly important to provide a properly
grounded and shielded environment and to use electrical surge-suppression devices.
2
), minimum 90°C wire, or as required by
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