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Introduction 1 - 7
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.
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.
Table 1-3. Dip Switch SW3 Settings for Switches 1 and 4
Switch Function
Factory
Default
Switch Setting
Off On
1 Enable/disable
crossover mode for
port 8 only
enable disable
(uncrossed)
enable
(crossed)
4 Squelch mode high low high