Installation guide

Glossary

890 USE 101 00 October 2006 151

input module A device used to connect field inputs. This module mounts into an I/O housing at a

drop/channel location.

insertion loss The amount of signal lost through a device.

LAN (local area

network)

A computer network for communication among nodes over a relatively small area

(usually less than 10 mi)

link layer The RIO communications layer that assures proper message transmission and

reception over the network.

mandrel The inner section edge of the F connector. As you look into the F connector, the

mandrel is the flat edge; the white dielectric must be aligned to the edge of the

mandrel.

mechanical

splicing

Joining of two fiber optic cables together by mechanical means—e.g., elastrometric

splicing—to enable a continuous signal.

media Cable system components used to make a network.

Modbus A proprietary Modicon protocol for communicating between Modicon systems and

host devices—e.g., computers, data access panels.

modem

(modulator

demodulator)

A device that encodes digital data from a host device to an RF signal transmitted

over the network and vice versa.

multimode fiber An optical waveguide in which light travels in multiple modes. Typical core/cladding

sizes are 50/125 μm, 62.5/125 μm, and 100/140 μm.

This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com