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AT-9000 Switch Command Line User’s Guide
145
Setting the Speed and Duplex Mode
The twisted pair ports on the switch can operate at 10, 100, or 1000 Mbps,
in either half-duplex or full-duplex mode. You may set the speeds and
duplex modes yourself or, since the ports support Auto-Negotiation, you
may let the switch configure the ports automatically. The default setting for
the ports is Auto-Negotiation for both speed and duplex mode.
To set the speed manually on a port or to reactivate Auto-Negotiation, use
the SPEED command in the Port Interface mode. The format of the
command is:
speed auto|10|100|1000
The “10” setting is for 10Mbps, the “100” for 100Mbps and the “1000” for
1000Mbps. The “auto” activates Auto-Negotiation for port speed.
The DUPLEX command, for setting the duplex mode, has this format:
duplex auto|half|full
The “half” setting is for half-duplex mode and “full” for full-duplex mode.
The “auto” activates Auto-Negotiation for duplex mode.
You should review the following information before configuring the ports:
Auto-Negotiation may be activated separately for speed and
duplex mode on a port. For instance, you may activate Auto-
Negotiation for speed on a port, but set the duplex mode manually.
The 1000 Mbps setting in the SPEED command is for fiber optic
modules. The twisted pair ports on the switch must be set to Auto-
Negotiation to operate at 1000 Mbps.
Note
To avoid a duplex mode mismatch between switch ports and
network devices, do not use duplex mode Auto-Negotiation on ports
that are connected to network devices on which the duplex modes
are set manually. Switch ports that are set to Auto-Negotiation
default to half duplex mode if they detect that the network devices
are not using Auto-Negotiation. This may result in duplex mode
mismatches in which the switch ports use half duplex mode, and the
network devices full duplex mode. To prevent this problem, always
manually set the duplex mode on ports that are connected to
network devices that are not using Auto-Negotiation.