Juniper SRX240 Hardware Manual page 158

SRX240 Services Gateway Hardware Guide
Related
Documentation
144
Table 36: Site Electrical Wiring Guidelines for the Services Gateway
Site Wiring Factor
Signaling Limitations
Radio Frequency
Interference (RFI)
Electromagnetic
Compatibility (EMC)
CAUTION: To comply with intrabuilding lightning/surge requirements, the
intrabuilding wiring must be shielded. The shielding for the wiring must be
grounded at both ends.
SRX240 Services Gateway AC Power Specifications and Requirements on page 145
SRX240 Services Gateway Grounding Specifications on page 147
SRX240 Services Gateway Power Supply on page 20
Guideline
To ensure that signaling functions optimally:
Install wires correctly.
Improperly installed wires can emit radio interference.
Do not exceed the recommended distances or pass wires
between buildings.
The potential for damage from lightning strikes increases if wires
exceed recommended distances or if wires pass between
buildings.
Shield all conductors.
The electromagnetic pulse (EMP) caused by lightning can
damage unshielded conductors and destroy electronic devices.
To reduce or eliminate the emission of RFI from your site wiring:
Use twisted-pair cable with a good distribution of grounding
conductors.
Use a high-quality twisted-pair cable with one ground conductor
for each data signal when applicable, if you must exceed the
recommended distances.
Provide a properly grounded and shielded environment and use
electrical surge-suppression devices.
Strong sources of electromagnetic interference (EMI) can cause
the following damage:
Destroy the signal drivers and receivers in the device
Conduct power surges over the lines into the equipment, resulting
in an electrical hazard
NOTE: If your site is susceptible to problems with EMC, particularly
from lightning or radio transmitters, you may want to seek expert
advice.
Copyright © 2013, Juniper Networks, Inc.