Routing Engine Interface Cable and Wire Specifications for the SRX5400 Services
Gateway
lists the specifications for the cables that connect to management
ports and the wires that connect to the alarm relay contacts.
Table 48: Cable and Wire Specifications for Routing Engine Management
and Alarm Interfaces
Routing
Engine
Receptacle
Maximum
Length
Cable/Wire
Supplied
Cable
Specification
Port
RJ-45 female
6 ft
(1.83 m)
One 6-ft (1.83-m)
length with
RJ-45/DB-9
connectors
RS-232 (EIA-232)
serial cable
Routing Engine
console or
auxiliary
interface
RJ-45
autosensing
328 ft
(100 m)
One 15-ft (4.57-m)
length with
RJ-45/RJ-45
connectors
Category 5 cable or
equivalent suitable
for 100Base-T
operation
Routing Engine
Ethernet
interface
Related
Documentation
Connecting the SRX5400 Services Gateway to a Network for Out-of-Band Management
on page 185
•
•
Connecting the SRX5400 Services Gateway to a Management Console or an Auxiliary
Device on page 184
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable for the SRX5400 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 SRX5400 Services Gateway
on page 125
•
Copyright © 2017, Juniper Networks, Inc.
124
SRX5400 Services Gateway Hardware Guide
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