
Related
Documentation
Distance Limitations for Signaling for the SRX3400 Services Gateway on page 195
•
•
Electromagnetic Compatibility for the SRX3400 Services Gateway on page 196
Electromagnetic Compatibility for the SRX3400 Services Gateway
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 services gateway 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.
CAUTION:
To comply with intrabuilding lightning/surge requirements,
intrabuilding wiring must be shielded, and the shield for the wiring must be
grounded at both ends.
Related
Documentation
Distance Limitations for Signaling for the SRX3400 Services Gateway on page 195
•
•
Radio Frequency Interference for the SRX3400 Services Gateway on page 195
SRX3400 Services Gateway Network Cable Guidelines
This section includes the following topics:
•
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the SRX3400 Services
Gateway on page 196
•
Attenuation and Dispersion in Fiber-Optic Cable for the SRX3400 Services
Gateway on page 197
•
Calculating the Power Budget for Fiber-Optic Cable for the SRX3400 Services
Gateway on page 198
•
Calculating the Power Margin for Fiber-Optic Cable for the SRX3400 Services
Gateway on page 198
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the SRX3400 Services Gateway
Multimode fiber is large enough in diameter to allow rays of light to reflect internally
(bounce off the walls of the fiber). Interfaces with multimode optics typically use LEDs
as light sources. LEDs are not coherent sources, however. They spray varying wavelengths
of light into the multimode fiber, which reflects the light at different angles. Light rays
travel in jagged lines through a multimode fiber, causing signal dispersion. When light
traveling in the fiber core radiates into the fiber cladding, higher-order mode loss (HOL)
results. Together these factors limit the transmission distance of multimode fiber
compared to single-mode fiber.
Single-mode fiber is so small in diameter that rays of light can reflect internally through
one layer only. Interfaces with single-mode optics use lasers as light sources. Lasers
Copyright © 2013, Juniper Networks, Inc.
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SRX3400 Services Gateway Hardware Guide
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