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MDI/MDI-X Switch
The MDI/MDI-X (Media Dependent Interface/Media Dependent Interface with
Crossover) switch, located on the front panel, is a straight-through or
crossover cable selection switch. It enables the RJ-45 port to be connected to a
repeater or DTE device without using a special crossover cable. The default
setting of the switch is MDI-X, which means you can connect the RJ-45 port to
a workstation or to any other DTE device that uses a straight-through cable.
For the MDI configuration, slide the switch to the MDI position and connect
the RJ-45 port to a repeater, hub, or switch using a straight-through cable.
See Figure 9.
AUTO NEG
TX
RX
COL
Configuration Switches
The configuration switches on the rear panel of the unit are used to configure
the operating characteristics of the port, such as it's port speed and duplex
mode, and the maximum packet size allowed by the switch.
Configuring a 100Base-FX fiber optic port involves setting its duplex mode to
either half- or full-duplex. Configuring a 10/100Base twisted pair port involves
setting the speed and duplex mode. You can have the switch do this
automatically through auto-negotiation or you can set these values manually.
The Byte switch controls the maximum packets size that the unit will allow.
You can set the switch to either 1518 bytes, which is the normal Ethernet
packet size or to 1522 bytes, which make the Ethernet unit compliant with the
IEEE 802.1Q VLAN tagging standard.
10Base-T/
10Base-T/
100Base-TX
100Base-TX
LNK
MDI
MDI-X
MDI
MDI-X
100
FD
PORT 1
PORT 2
FS203 FAST ETHERNET SWITCH
IEEE 802.3 /802.3U
10Base T/
100Base-TX
MDI
PORT 1
Figure 9 MDI/MDI-X Switch
AT-FS200 Series Installation Guide
AUTO NEG
PWR
TX
LNK
RX
100
COL
FD
10Base-T/
100Base-TX
MDI-X MDI
PORT 2
MDI-X
9
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