Allied-telesis AT-MR820TR Bedienungsanleitung PDF herunterladen (Seite 48)

Topology

Backbone Networks

The most straightforward topology is a backbone network. Figure 15

show a backbone network topology with the AUI port attaching to a

coaxial Ethernet cable.

Figure 15: AT-MR820TR Backbone Topology

In a backbone network topology, each workgroup has its own local

network and the backbone is used to link the various workgroups

through the bridges. The advantages of a backbone network topology

are twofold:

❑ When the backbone network is operating correctly, any

problem within a sub-network does not affect other sub-

networks.

❑ Since faults are isolated to a single sub-network, they are

easier to locate.

MDI/MDI-X Switch and Uplink Port

While any RJ45 port can be used to cascade repeaters, port 4/8 has

been specifically designed with an uplink (cascading) capability, by

providing a Media Dependent Interface (MDI/MDI-X) switch.

Cascading through port 4/8 means if a single, standalone

AT-MR420TR/AT-MR820TR Micro Repeater can support 4/8 ports,

when a second AT-MR420TR/AT-MR820TR Micro Repeater is

uplinked (cascaded) using the port 4/8 of the first unit to any port of a

100 Meters

maximum

Category 3-5

STP/UTP cable

wired Pin to Pin

AUI cable

Coaxial Backbone

Ethernet

Transceiver

MRx20TR(STP/UTP)_BookA Page 26 Thursday, April 3, 1997 5:24 PM

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Allied-telesis AT-MR820TR Bedienungsanleitung Seite 48