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Two groups are defined when VLAN function is enabled. The setting 1
defines two groups without any overlapping. These two groups are in-
dependent and isolated. No network data can be forwarded between two
groups. However, the setting 2 defines two groups with some overleap-
ing ports. The overlapping ports belong to two groups at the same time.
They are able to communicate with any Ethernet nodes globally. De-
pending on your application need, choose the appropriate setting for
your installation.
3.7 Trunking Support
Two switch units can be cascaded together through any regular switched
port on each unit when an expansion is required. However, the transfer
bandwidth between the two cascaded ports is limited to 200Mbps full
duplex.
To increase the bandwidth for the connection between two switch units,
a trunking function is implemented on the switch unit for this purpose.
Some ports can be configured optionally as trunking ports. A pair of
trunking ports composes one trunk. Two switch units can be cascaded
through one trunk (two ports and two cables). The aggregated band-
width of one trunk can be up to 400Mbps.
The port pairs which are equipped with trunking function are:
Figure 3-5 Trunking Ports