Specifications For 1786-Rpfm Fiber Optic Cable; Estimate Cable Lengths - Allen-Bradley ControlNet 1786-RPFM Installation Instructions Manual

12 ControlNet Modular Repeater Medium Distance Fiber Module

Specifications for 1786-RPFM Fiber Optic Cable

The quality of the fiber cable determines the distance you can achieve. Consult
your local distributor for attenuation specifications prior to purchasing your fiber
media components. The table below provides specifications for fiber optic cable:
Item
Fiber Type
Fiber Termination Type
Fiber Operating Wavelength
Optical Power Budget
1
This includes all loss associated with the fiber link, including: splices, fiber attenuation, bulkhead connectors,
and the 1786–RPFM ST terminations.
The medium-distance fiber module (1786-RPFM) is designed for use with 62.5/
125µm multi-mode optic fiber and plastic or ceramic ST type connectors. The
wavelength used is 1300 nm.

Estimate Cable Lengths

The maximum length of a fiber cable section for the 1786-RPFM is dependent on
the quality of the fiber, number of splices, and the number of connectors. The total
attenuation for a cable section must be less than 13.3dB.
Typically cable attenuation for a wavelength of 1300nm is less than 1.5dB/km.
IMPORTANT
Publication 1786-IN011B-EN-P - October 2000
Avoid splicing your cable. Connectors can cause considerable
attenuation and limit the maximum length of your system. Be
certain to check the attenuation of different cable sections
after the cable is installed.
Description
µm
62.5/125
®
ST (Plastic or ceramic)
1300nm
1
13.3db