3Com OfficeConnect 3CDSG10PWR User Manual page 207

Select port — Selects the port for mirroring or monitoring. A port
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unavailable for mirroring is colored grey.
Summary — Displays the current monitor and mirror ports. The fields
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displayed are:
Monitor — Displays the monitor port.
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Mirror In — Displays ports that are monitored on the RX.
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Mirror Out — Displays ports that are monitored on the TX.
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2 Select a port type.
3 If the Mirror port type has been selected, select Mirror In and/or Mirror
Out.
4 Select the ports to be monitored.
5 Click . Port mirroring is enabled, and the device is updated.
Configuring Port Mirroring 207