RadioLAN DockLINK - Manual (Page 100)

890-010 12/04/98 Page 92 © 1998 RadioLAN.
Status LEDs
There are two Status LEDs (green/green) which provide system status.
The green Status 1 LED illuminates when the DockLINK senses at least one wireless station within range.
The green Status 2 LED flickers when data passes between the DockLINK and wireless stations on the network.
MDI/MDI-X switch
Interconnection on a 10BaseT Network Interface Card must always be between MDI to MDI-X. The transmitter of
each device must connect to the receiver of the other device. The reversal of the transmit and receive
assignments is called a crossover function. Every 10BaseT interconnection requires a crossover function.
Generally, 10BaseT ports on an adapter card are configured as MDI, and 10BaseT ports on a repeater/hub are
configured as MDI-X.
The DockLink allows you to configure its 10BaseT port as an MDI (switch out position) or MDI-X (switch in
position) port. The abbreviation MDI stands for Media Dependent Interface, and is specified by the IEEE 802.3i
10BaseT standard to be the electrical and mechanical interface to the UTP wire. An MDI port transmits out to the
UTP wire on pins 1 and 2, and receives from the UTP wire on RJ-45 pins 3 and 6.
The MDI/MDI-X switch swaps the pin assignments of transmit and receive data wire-pairs for the 10BaseT port.
MDI-X configuration is used when the remote end of the wire is connected to a network station (for example,
a10BaseT adapter card) or to an MDI port on a 10BaseT concentrator. MDI configuration is used when the
remote end of the wire is connected to a 10BaseT concentrator.