Chapter 5: Local Management
Desired Oper. Mode (Selectable)
This field allows the user to select the desired operational mode for an interface in port 25 or 26. The field toggles between 100BASE-FX and 100BASE-FXFD (full duplex) when an FE-100FX or FE-100F3 is installed. Section 5.15.1 describes how to configure a port with an FE-100FX or FE-100F3.
In normal operation, the port with an FE-100TX installed automatically establishes a link with the device at the other end of the segment without requiring user setup. However, Local Management provides the user with the option of manually configuring that port.
If an FE-100TX is installed, the field steps to Auto-Negotiation, 10Base-T, 10Base-TFD (full duplex), 100Base-TX, and 100Base-TXFD (full duplex). In normal operation, the port with an FE-100TX installed is capable of auto-negotiating the operational mode and no further user setup is required. Section 5.15.3 describes how to manually configure an FE-100TX.
In Auto-Negotiation, the FE-100TX negotiates to the highest common denominator of the two interfaces. The order of priority of negotiation is 100BASE-TXFD, 100BASE-TX, 10BASE-TFD, and 10BASE-T.
Advertised Ability (Selectable)
During auto-negotiation, the FE-100TX “tells” the device at the other end of the segment about its capabilities. The capabilities of a port (25 or 26) with an FE-100TX installed are 10Base-T, 10Base-TFD (full duplex mode), 100Base-TX and 100Base-TXFD (full duplex mode). In normal operation, with all capabilities enabled, the FE-100TX “advertises” that it has the ability to operate in any mode. The Network Manager may choose to set up the port so that only a portion of the available capabilities are advertised and the others are disabled. For example, only 100Base-TX and 100Base-TXFD might be enabled so that only devices that operate at 100 Mbps can communicate with that port. Section 5.15.5 describes how to enable or disable advertised modes.
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