Table 1-3 explains crossover mode and squelch mode switch settings and the sections following the table explain these features in more detail. The channel selection switches are discussed in Table 1-4.
Table 1-3. Dip Switch SW3 Settings for Switches 1 and 4
| Switch | Function | Factory | Switch Setting |
| Default | Off | On |
| | |
| | | | | |
| 1 | Enable/disable | enable | disable | enable |
| | crossover mode for | | (uncrossed) | (crossed) |
| | port 8 only | | | |
| | | | | |
| 4 | Squelch mode | high | low | high |
| | | | | |
Crossover Mode Switch
All eight ports on the 10BASE-T Module are internally crossed over as per 10BASE-T standard. This enables the 10BASE-T Module to be connected to a 10BASE-T Transceiver. Port 8, however, can be uncrossed using the crossover mode switch to connect the 10BASE-T Module directly to another 10BASE-T Module without the need for an external crossover adapter. One port must be crossed over and the other port (port 8) must be uncrossed when connecting a 10BASE-T Module to another 10BASE-T Module. If both ports are crossed, you must use an external crossover adapter to provide a proper connection.
The Off position disables crossover mode (uncrosses) and the On position enables crossover mode (default), therefore, port eight is initially crossed over.
Squelch Mode Switch
The Squelch mode switch allows you to set the Squelch level to high (normal) or low (sensitive). The On position sets the Squelch level to high (default). The High Squelch level conforms to the proposed 10BASE-T standard. In general, 3Com recommends using High Squelch.
Introduction 1 - 7
