Allied-telesis AT-MR820T Bedienungsanleitung PDF herunterladen (Seite 44)

Topology

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-MR420T/

AT-MR820T Micro Repeater can support 4/8 ports, when a second

AT-MR420T/AT-MR820T Micro Repeater is uplinked (cascaded) using

the port 4/8 of the first unit to any port of a second unit. A maximum of

four repeaters (the four repeater rule) can be interconnected. The

network effectively consists of 6 nodes for the AT-MR420T and 14

nodes for the AT-MR820T. The Uplink port is located on the back

panel, as shown in Figure 13.

Figure 13: Uplink Port

Port 4/8 has the ability to become a dedicated uplink port. To facilitate

this process, it uses a Media Dependent Interface (MDI/MDI-X) switch.

An MDI/MDI-X switch is a crossover/straight-through cable selection

slide switch. As shown in Figure 13, the MDI/MDI-X switch converts

the 10Base-T (RJ45) Port 4/ 8, to an uplinkable port that allows one

repeater to connect to another repeater without requiring special

crossover cables.

MRx20T(UTP)Ver6_Book Page 22 Thursday, April 3, 1997 5:18 PM

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Allied-telesis AT-MR820T Bedienungsanleitung Seite 44