Cabletron Systems 2000 - Manual (Page 64)

The SmartSwitch 2000 Chassis View
2-42 Managing the Hub
100Base-FX ports do not support auto negotiation for bandwidth or ßow control
capability, so you must choose between 100Base-FX Half Duplex and 100Base-FX
Full Duplex mode, and set the ßow control option. However, you must still be
sure that both link partners are set to the same operational mode, or the link will
be unstable.
For 1000Base-SX/LX/CX ports the speed and duplex modes are always
conÞgured at 1000MB Full Duplex. However, you can select Auto Negotiate
mode, which allows the port to negotiate with its link partner to Þnd the highest
mutually available bandwidth and ßow control. If you select Auto Negotiate
mode, you must also choose which of the portÕs bandwidth and ßow control
capabilities you wish to advertise to the link partner (refer to
Auto Negotiation
Technologies , page 2-42 ).
To set your desired operational mode:
1. Click on the Speed, Duplex, or Flow Control list box to display the menu of
available options; click to select the operational mode you wish to set.
2. Click on the Apply button to save your changes.
Auto Negotiation Technologies
For ports which have been conÞgured to operate in Auto Negotiate mode, this list
box allows you to select which of the operational modes available to the port will
be advertised to the negotiating link partner.
During Auto Negotiation, each of the link partners will advertise all selected
modes. Of the selected modes, the highest mode mutually available will
automatically be used. If there is no mode mutually advertised, no link will be
achieved.
If you have manually conÞgured speciÞc operational modes for your 100Base-TX
port or if you are conÞguring a 100Base-FX port, the Auto Negotiation
Technologies list box does not apply.
NOTE
If the port you are conÞguring does not support Flow Control, the Current Mode Þeld will
display Ònot supportedÓ and the Desired Mode list box will be disabled.
TIP
If you select Auto-Negotiation at both ends of a link, be sure at least one
mutually-advertised operational mode is available.