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
Signal-Distance Limitations for the SRX3600 Services Gateway | 92
Radio Frequency Interference for the SRX3600 Services Gateway | 92
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the
SRX3600 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 generate a single wavelength of light,
which travels in a straight line through the single-mode fiber. Compared with multimode fiber, single-mode
fiber has higher bandwidth and can carry signals for longer distances. It is consequently more expensive.
RELATED DOCUMENTATION
Attenuation and Dispersion in Fiber-Optic Cable for the SRX3600 Services Gateway | 94
Calculating the Power Budget for Fiber-Optic Cable for the SRX3600 Services Gateway | 95
Calculating the Power Margin for Fiber-Optic Cable for the SRX3600 Services Gateway | 95
93
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