Installation guide

Glossary
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890 USE 101 00 October 2006
RG-11 A standard coaxial cable type, providing good shielding and medium to low signal
loss.
RG-6 A standard coaxial cable type, providing good shielding and fair signal loss.
scattering A property of glass that causes light to deflect from the fiber and contribute to
attenuation on the fiber link.
self terminating F
adapter
A device used on a drop cable to provide proper termination in the event that the
node is disconnected from the drop cable.
semirigid cable A standard coaxial cable with very low loss and maximum shielding over the
maximum trunk cable distance.
sequence
number
Part of the RIO message sent over the medium so that the nodes can track packet
numbers in the event that a packet retransmission becomes necessary.
shield The outer conductor of a coaxial cable that protects the message transmission on
the cable from noise.
shield
effectiveness
Measured in dB—the higher the value, the better the cable shield.
signal loss The amount of signal lost through media devices. See also attenuation.
spectrum
analyzer
A device used to test the medium’s ability to transmit within a frequency range. It
shows signal amplitude on the y-axis and frequency measurement on the x-axis.
star coupler Optical component that allows emulation of a bus topology in fiber optic systems.
start frame
delimiter
A preset octet pattern marking the start of the message packet.
sweep generator A test device for checking the amplitude integrity of a medium over the bandwidth of
RIO signals. It generates a user-specified output signal at a user-specified
frequency.
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This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com