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Chapter 5: Local Management
5-50 2E42-27/2E42-27R/2E43-27/2E43-27R User’s Guide
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.
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.
NOTE
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.