Allied-telesis AT-MR820T Bedienungsanleitung PDF herunterladen (Seite 47)

AT-MR420T and AT-MR820T

Fiber Optic Backbone

By attaching a fiber optic transceiver, the AUI port can connect your

network to a fiber optic (10Base-FL/FOIRL) cable backbone.

Figure 15: AT-MR820T on a Fiber Optic Backbone

The advantages of fiber optic cable are as follows:

❑ immune to electromagnetic interference

❑ spans longer distances without attenuation

❑ eliminates grounding problems

❑ secure from unauthorized taps

10Base-FOIRL. The IEEE FOIRL (fiber-optic inter-repeater link)

standard limit of a fiber segment is 1 km. The fiber optic cable that

connects two repeaters is limited to 1 km.

10Base-FL. The more recent IEEE 10Base-FL standard extends a fiber

segment length to 2 km. This applies only to topologies in which one

10Base-FL node connects to another 10Base-FL node.

Fiber Optic

Transceiver

100 Meters

maximum

Category 3-5

UTP cable

wired 

Pin to Pin

MRx20T(UTP)Ver6_Book Page 25 Thursday, April 3, 1997 5:18 PM

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Allied-telesis AT-MR820T Bedienungsanleitung Seite 47