Allied Telesis AT-MR820T - Manual (Page 47)

AT-MR420T and AT-MR820T
25
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