Rockwell Automation 1786-RPFM ControlNet Modular Repeater Med-distance Fiber Module Installation Instructio - Manual (Page 10)

10 ControlNet Modular Repeater Medium-distance Fiber Module
Rockwell Automation Publication 1786-IN011C-EN-P - November 2010
You can attach a maximum of four modules to the repeater adapter, or, the
number of modules whose total power consumption does not exceed
1.6 A @ 5V DC, whichever occurs first.
Select Fiber Cable
The type of fiber cable you choose depends on the network environment. The
quality of fiber cable determines the distance you can achieve. The maximum
length of a fiber cable section for the module depends on the quality of fiber,
number of splices, and the number of connectors. The total attenuation for a
cable must be less than 13.3 dB. Typically, cable attenuation for a wavelength of
1300 nm is less than 1.5 dB/km.
Refer to the specification table on page 13 and also to the ControlNet Fiber
Media Planning and Installation Guide, publication CNET-IN001 , for more
details.
Also, consult with your local distributor for attenuation specifications before
you purchase your fiber media components.
Terminate Your Cable
You must terminate a medium distance cable in the field. To terminate, we
recommend that you cover unused ports with a suitable protector cap to prevent
dust and other contaminants from damaging the fiber transceiver ports.
For unused ports, we recommend that you place a simplex jumper between the
transmit port and receive port of an unused channel.
IMPORTANT If you exceed the module or power limit, you may damage the
repeater adapter and modules.
IMPORTANT Avoid splicing your cable. Connectors can cause considerable
attenuation and limit the maximum length of your system. Make
certain to check the attenuation of different cable sections after
you install the cable.