Juniper Networks SRX 210 - Manual (Page 156)

Table 40: Site Electrical Wiring Guidelines for the Services Gateway
Guideline Site Wiring Factor
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.
Signaling Limitations
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.
Radio Frequency
Interference (RFI)
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.
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.
Related
Documentation
General Site Guidelines for Installing the SRX210 Services Gateway on page 39 •
• SRX210 Services Gateway Electrical and Power Requirements on page 42
• SRX210 Services Gateway Power Specifications and Requirements on page 141
Copyright © 2013, Juniper Networks, Inc. 140
SRX210 Services Gateway Hardware Guide