3Com 3C16685 User Manual - page 56
56
C
HAPTER
3: U
SING
THE
C
OMMAND
L
INE
I
NTERFACE
Enabling and Disabling Auto-negotiation
Auto-negotiation is a system that allows the Hub to automatically
detect the speed of twisted pair links, and thereby set the speed of its
twisted pair ports. If auto-negotiation is enabled on a
10BASE-T/100BASE-TX port, the speed of the link is automatically
detected and set accordingly.
You can enable and disable auto-negotiation for Ethernet ports on
the Hub using the
autoNegotiation
command on the Ethernet
menu.
1 At the Top-level menu, enter:
ethernet autoNegotiation
The following prompt is displayed:
Select Ethernet port (1-24):
2 Enter the number of the port to have auto-negotiation enabled or
disabled.
The following prompt is displayed:
Enter new value (enable,disable) [enable]:
3 Enter
enable
or
disable
.
Fiber ports and Transceiver Module ports are not auto-negotiating. If
the port is one of these ports, auto-negotiation cannot be enabled.
If auto-negotiation is disabled, the speed of the port is set using the
portMode
command. For more information, see
“Specifying the
Speed of a Port”
on
page 59
.
Ethernet Port Statistics
You can display detailed information about a single Ethernet port by
entering the following:
ethernet detail
The command line interface shows a screen of information similar to
the following: