And Dispersion; Signal Loss In Multimode And Single-Mode Fiber-Optic Cable; Table 76: Cable Specifications For Switch-To-Management-Device - Juniper EX4300 Hardware Manual

Table 76: Cable Specifications for Switch-to-Management-Device Connections
Ports on EX4300 Cable
Switches Specification
RJ-45 Console CAT5e UTP
( CON2 ) port (unshielded
twisted pair) cable
Management –
( ) Ethernet
MGMT
port
(10/100/1000)
Mini-USB Type-B –
Console ( )
CON1
port
Related
Documentation
Understanding EX Series Switches Fiber-Optic Cable Signal Loss, Attenuation, and
Dispersion

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

Copyright © 2015, Juniper Networks, Inc.
Cable/Wire
Supplied
One 7-ft (2.13-m)
length with
RJ-45/DB-9
connectors
No
No
Management Port Connector Pinout Information for an EX4300 Switch on page 142
Mini-USB Port Specifications for an EX4300 Switch on page 140
Console Port Connector Pinout Information for an EX Series Switch on page 139
EX4300 Switches Hardware Overview on page 3
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 137
Attenuation and Dispersion in Fiber-Optic Cable on page 138
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),
Chapter 8: Transceiver and Cable Specifications
Switch
Maximum Length Receptacle
7 ft (2.13 m) RJ-45
– –
– –
Additional
Information
"Connecting a
Switch to a
Management
Console" on
page 183
"Connecting a
Switch to a
Network for
Out-of-Band
Management" on
page 181
"Connecting an
EX4300 Switch to
a Management
Console Using the
Mini-USB Type-B
Console Port" on
page 185
137