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Crossover Cable
When cascading or connecting the hub to another switch, bridge, or hub
through the UTP port, a modified crossover cable is necessary. With a
crossover cable, two pairs of wires are switched at one connector end. Carry
out the following steps to create a customized, crossover twisted-pair cable:
1.
Leave one end of the cable as is, with the RJ-45 connector intact. The
wiring at just one end of the cable needs to be modified.
2.
At the other end of the cable, connect wires 1 and 2 to contacts 3 and 6
respectively. Likewise, connect wires 3 and 6 to contacts 1 and 2.
Refer to the following diagram:
RD+
RD+
1
1
3
3
6
6
TD+
TD+
RD-
RD-
TD-
TD-
2
2
Hub
(
MDI-X
)
Switch
(
MDI-X
)
Crossover Cable
MII Connector
The MII (Media-Independent Interface) is a standard 40-pin connector that
you can use to connect other types of 100Mbps network media to your DES-
2212. Using a transceiver connected to the MII port on the rear panel of
your switch, you can connect the switch to a 100BASE-FX or 100BASE-T4
link.
This appendix shows the pin assignments for the MII connector, which is
specified in the IEEE 802.3u Fast Ethernet standard.