Weidmuller SL-MOD-GW Bedienungsanleitung PDF herunterladen (Seite 6)

A.6

WAUS Data Products Main Line Catalogue 2013

Active Components

Optical ber interfaces

To send data over an optical ber, the data is converted

to a series of binary pulses (at a xed frequency) and sent

down the ber using an LED. At the other end the pulses are

detected by a matched photodiode. This string of binary 0s

and 1s is assembled back into packets of data at the data

link layer.

Due to the property of total internal reection, light

transmitted in optical ber has the advantage of low power

loss and attenuation so it can be used to send signals over

large distances. The typical composition of optical ber is

core, cladding and cover, as shown.

Light can be transmitted in two modes: single mode

and multimode. For single mode optical ber there is no

reection off the walls of the ber during transmission,

this allows greater bandwidth and data rates, over longer

distances, than multimode ber.

RJ45 plug T568A assignment T568B assignment

Core Cladding Cover

Single-mode optic fiber

Multi-mode optic fiber

SC connectors SFP multi-function connector LC connector ST connector

1st pin

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1st pin

Most commonly used ber optic connectors

The most commonly used ber optic connectors are SC, ST, LC, as well as some combined connectors such as

SFP, Combo.

RJ45

In a copper Ethernet connection, data is converted to a

binary electrical signal for transmission over the twisted

pair cable (Physical layer of the OSI model). The electrical

signals representing by binary codes 0 or 1 are received and

converted (at the Data Link Layer level) to data frames.

RJ45 connectors can be wired as either T568A and T568B

types. Twisted pair that has direct connection between

connectons at each end is called straight through cable,

while the other type is called a cross-over cable.

Industrial Ethernet Interfaces

Active Components | Industrial Ethernet Interfaces

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