Industrial Communication Guide

ETHERNET IN INDUSTRIAL USE

4.1.4. AIR AS A TRANSMISSION MEDIUM

The E2000 connector has a release tab and also a protective cap which automatically opens when the connector is plugged in. It can be used for both single-mode and multi-mode. The MPO connector (multiple-fiber push-on) clusters up to 32 fibers and is mainly used as a substitute for duplex patch cables as well as for applications where fiber optics lines are grouped together.

Data does not have to be transmitted via cables (such as copper cables or fiber optic cables): it can also be transmitted through the air, for example by means of Bluetooth, LTE and WLAN. Limitations to transmission via the air Air is generally accepted as a shared medium. This means that in a similar way to the hub mentioned at the beginning of this module, simultaneous collision-free wireless transmission by several parties is not possible. An increase in the number of users is bound to lead to a reduction in the transmission capacity available to each user. In order to avoid influencing other types of wireless transmission (such as military or police radio), specific radio frequencies have been de- fined for civilian use. The frequency ranges of 2.4 GHz and 5 GHz are used for wireless LAN worldwide. Restrictions are applied to these frequency ranges in the various groups of countries (USA, Japan and Europe). Transmission is via so-called channels. The more recent standards allow several channels to be bundled so as to achieve higher data rates.

Top view

Side view

Front view

E 2000 Connector

MPO Connector

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