10/100 Auto Negotiation Switch User’s Guide
Ports
There are three types of ports on the DES-3224: MDI-II Uplink, MDI-X and RS-232. The difference between the MDI-II Uplink port and the MDI-X ports is the internal pin arrangement.
MDI-II Port
An MDI-II port is a straight through port. The pin arrangement is the same as the pin arrangement of a straight through cable.
MDI-X Port
MDI-X ports are crossover ports. The pin arrangement is the same as the arrangement in a crossover cable. The advantage of an MDI-X port is that you can connect a device with an MDI-II port without using a crossover cable. Just make a straight cable, plug it into the MDI-II port and plug the other end into another device.
Table 3: Cable Connections, displays the proper cable to use when connecting to various devices.
Table 3: Cable Connections
| DES-3224 | Workstation with MDI-II Port | Other device | |
| | |
| MDI-X | MDI |
| | |
| | | | |
| MDI-II | Crossover | Straight | Crossover |
| | | | |
| MDI-X | Straight | Crossover | Straight |
| | | | |
The steps for connecting the DES-3224 to 10 Mbps devices or 100 Mbps devices are the same. All the ports will auto negotiate the proper speed and duplex mode. The DES-3224 has two rows of 12 MDI-X ports.
Follow these steps to connect cables to the DES-3224:
1.Check for the appropriate cable configuration for each device.
2.Plug one end of the cable into the MDI-II Uplink port, if appropriate, or any of the MDI-X ports.
3.Plug the other end into the appropriate port on the other device.
4.Verify that the LED indicates connection at the proper speed and duplex mode.
RS-232 Port
The RS-232 Port is located at the rear of the DES-3224. The RS-232 port is a female port that is used for serial communication. By connecting the DES-3224 and a PC you can configure the DES-3224 and check its status and configurations even when the network is down. Use the RS-232 cable provided to connect the DES-3224 and a PC.
