Allied Telesis AT-MR820TR - Manual (Page 28)

Product Description
6
Backbone Enable Switch
This dual-position switch allows you to activate the backbone network
AUI and BNC ports.
When this switch is ON (default position), it is depressed below the
surface of the chassis. The ON position (enabled) indicates that both
10Base2 and AUI ports have a backbone network capability.
Deactivating the switch to OFF (disabled) means that the switch is
flush with the surface of the chassis. As a result, the ports are not
capable of connecting to a backbone network.
Media Select Switch
The Media Select switch is only active after the Backbone Enable
switch is activated. It functions as the name implies — you have the
ability to determine the medium of connectivity to the network
backbone: either the 10Base2 (BNC) port or the 10Base5 (AUI) port
(but not both).
The default position is AUI (the switch is flush with the surface of the
chassis).
The AUI port also allows you to attach an optional, inexpensive
external micro transceiver for additional LAN connectivity using
thinnet, twisted pair or fiber optic cable.
When the switch is pressed below the surface of the chassis, the
10Base2 port is selected. Notice that the 10Base2 backbone port also
includes a user-selectable 50
Ω
terminator switch. The use of the
terminator switch is discussed in Chapter 4.
MRx20TR(STP/UTP)_BookA Page 6 Thursday, April 3, 1997 5:24 PM