Signal Loss In Multimode And Single-Mode Fiber-Optic Cables; Table 32: Cable Specifications For Console And Management Connections For The Qfx Series - Juniper QFX5100 Hardware Manual

QFX5100 Switch Hardware Guide

Table 32: Cable Specifications for Console and Management Connections for the QFX Series

Port on QFX Series
Device Cable Specification
Console port RS-232 (EIA-232) serial cable
Management port Category 5 cable or
equivalent suitable for
1000BASE-T operation
Related
Documentation
Understanding QFX Series Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion

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

84
NOTE: The QFX Series can be configured with SFP management ports that
support 1000BASE-SX transceivers. See Interface Specifications for SFP,
SFP+, and QSFP+ Transceivers for the QFX Series for more on the fiber-optic
cables required for use with these transceivers.
Cable Supplied
One 7-foot (2.13-meter) long
RJ-45 patch cable and RJ-45 to
DB-9 adapter
One 7-foot (2.13-meter) long
RJ-45 patch cable
Console Port Connector Pinouts for the QFX Series
Management Port Connector Pinouts for the QFX Series
Connecting a QFX Series Device to a Management Console
Connecting a QFX3600 Device to a Network for Out-of-Band Management
Connecting a QFX3500 Device to a Network for Out-of-Band Management
Connecting a QFX3100 Director Device to a Network for Out-of-Band Management
Connecting a QFX5100 Device to a Network for Out-of-Band Management
Connecting a QFX5200 to a Network for Out-of-Band Management
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.
The QFX Series uses various types of network cables, including multimode and
single-mode fiber-optic cables.
Signal Loss in Multimode and Single-Mode Fiber-Optic Cables on page 84
Attenuation and Dispersion in Fiber-Optic Cable on page 85
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 reflect 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
Device
Maximum Length Receptacle
7 feet (2.13 meters) RJ-45
328 feet RJ-45
(100 meters)
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