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87
(auto-negotiation). We recommend that you keep this setting so that
you have maximum flexibility when connecting devices to the unit.
The front panel ports on the Dual Speed Hub 500 and any transceiver
modules (that are used in the transceiver module slots) can only
operate in half duplex mode (shown by 'HD').
The Distance Extender Module is a 100Mbps transceiver module that
you can use with the Dual Speed Hub 500. The 100BASE-TX module
can only operate in half duplex mode, and the 100BASE-FX module
can operate in either full duplex mode or half duplex mode (this is
selectable by using the switch on the module). Refer to the
documentation that accompanies the module for information on
how to use it.
There are two levels of auto-sensing: 10/100 auto-sensing and Smart
auto-sensing. By default Smart auto-sensing is enabled for the stack.
It extends the normal auto-sensing functionality by monitoring any
100Mbps connections and, if necessary, downgrading them to
10Mbps connections if they are unsuitable at 100Mbps and will
operate better at 10Mbps.
If you set a port to a specific speed and then try to use the port with
equipment that operates at a different speed, the port will isolate
itself and the Port Status LED for that port may flash on the unit.
Smart auto-sensing will not affect ports that have been fixed to a
specific speed (either 10Mbps or 100Mbps) using the Port Speed
field.
Current Port Speed Shows the current port speed and duplex mode
('HD' is half duplex, 'FD' is full duplex).
If the connection has been downgraded from 100Mbps to 10Mbps
by Smart auto-sensing (probably due to poor quality cabling), there is
a line of red text under the Current Port Speed field informing you of
this change. For information on configuring Smart auto-sensing,
refer to
"Smart Auto-sensing"
on
page
98.
Console Port Configuration
This page configures the console port.
The console port on the Dual Speed Hub 500 is already correctly
configured by default, for direct connection to a management
station. Only alter these default settings if you are connecting a
modem to the console port.
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