Gateway; Signal Loss In Multimode And Single-Mode Fiber-Optic Cable For The Srx5400 Services Gateway; Routing Engine Interface Cable And Wire Specifications For The Srx5400 Services Gateway - Juniper SRX5400 Hardware Manual

APPENDIX D
Cable and Wire Guidelines and
Specifications for the SRX5400 Services

Gateway

Network Cable Specifications and Guidelines for the SRX5400 Services Gateway

Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the SRX5400 Services Gateway

Copyright © 2014, Juniper Networks, Inc.
Network Cable Specifications and Guidelines for the SRX5400 Services
Gateway on page 203
Alarm Relay Contact Wire Specifications for the SRX5400 Services Gateway on page 207
Console Port Cable and Wire Specifications for the SRX5400 Services
Gateway on page 208
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the SRX5400 Services
Gateway on page 203
Attenuation and Dispersion in Fiber-Optic Cable for the SRX5400 Services
Gateway on page 204
Calculating Power Budget for Fiber-Optic Cable for the SRX5400 Services
Gateway on page 205
Calculating Power Margin for Fiber-Optic Cable for the SRX5400 Services
Gateway on page 205
Routing Engine Interface Cable and Wire Specifications for the SRX5400 Services
Gateway on page 207
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
203