And Dispersion; Signal Loss In Multimode And Single-Mode Fiber-Optic Cable; Table 49: Cable Specifications For Switch-To-Management-Device - Juniper EX9214 Hardware Manual

EX9214 Switch Hardware Guide
Related
Documentation
Understanding EX Series Switches Fiber-Optic Cable Signal Loss, Attenuation, and
Dispersion

Signal Loss in Multimode and Single-Mode Fiber-Optic Cable

116

Table 49: Cable Specifications for Switch-to-Management-Device

Connections
Port on RE
Module Cable Specification
Console RS-232 (EIA-232) serial
( ) or cable
CONSOLE
auxiliary ( )
AUX
port
Ethernet ( ) Category 5 cable or
<...>
Management port equivalent suitable for
(10/100) 100Base-T operation
Alarm relay Wire with gauge
contacts between 28-AWG and
14-AWG (0.08 and
2.08 mm
Connecting an EX9200 Switch to a Management Console or an Auxiliary Device on
page 158
Connecting an EX9200 Switch to a Network for Out-of-Band Management on page 157
Connecting the EX9200 Switch to an External Alarm-Reporting Device on page 159
To determine the power budget and power margin needed for fiber-optic connections,
you need to understand how signal loss, attenuation, and dispersion affect transmission.
EX Series Switches use various types of network cable, including multimode and
single-mode fiber-optic cable.
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable on page 116
Attenuation and Dispersion in Fiber-Optic Cable on page 117
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. However, LEDs are not coherent light sources. 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 (layers of lower
refractive index material in close contact with a core material of higher refractive index),
higher-order mode loss (HOL) occurs. Together, these factors reduce the transmission
distance of multimode fiber compared to that of single-mode fiber.
Cable/Wire
Supplied
One 6 ft (1.83 m)
length with
RJ-45/DB-9
connectors
One 15 ft (4.57 m)
length with
RJ-45/RJ-45
connectors
No
2
)
Copyright © 2015, Juniper Networks, Inc.
Maximum Switch
Length Receptacle
6 ft RJ-45
(1.83 m) female
328 ft RJ-45
(100 m) autosensing
None —