Installation guide

Planning and Designing RIO Cable System
890 USE 101 00 October 2006 35
Point-to-point
Topology with
Fiber Optics
The following illustration shows two segments of RIO coaxial cable connected point-
to-point by two 490NRP954 Fiber Optic Repeaters. The fiber link may be run over
much longer distances than a coaxial drop cable, and through harsh environments
with noise immunity that cannot be achieved with copper wire.
The distance between the two repeaters is limited by the maximum allowable
attenuation of the fiber optic cable used in the installation. Fiber attenuation is
calculated separately from coaxial cable attenuation (see Attenuation Consider-
ations in an Optical Path, p. 56 for more details).
RIO I/O I/O I/OPLCP/S
Head (with RIO Drop #1)
Trunk Cable
Drop Cable
Fiber Optic Repeater (Drop)
Fiber Optic Repeater (Head)
Fiber Optic Tx and Rx Cables
Tap Tap Trunk Cable Tap
Trunk Terminator
RIO Drop #2 RIO Drop #3 RIO Drop #4
RIO I/O I/O I/OP/S RIO I/O I/O I/OP/S RIO I/O I/O I/OP/S
Trunk Terminator
Tap
Legend
Coaxial Cable
Fiber Optic Cable
Note: The repeater that has a hard-wired (coaxial) connection to the head
processor at the top of the RIO network is called the drop repeater. The repeater
that has a coaxial cable connection to the RIO drops is called a head repeater.
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com