3Com 3C16685 User Manual - page 59
Commands
59
■
Total Errors
— This number should be a small proportion of
the Good Frames number. It is the sum of the following errors
seen at the port:
■
FCS Errors
■
FCS Alignment Errors
■
Short Events
■
Frames Too Long
■
Very Long Events
■
Data Rate Mismatches
■
Late Events
Specifying the Speed of a Port
You can specify the speed of Ethernet ports on the Hub using the
portMode
command on the Ethernet menu.
To specify the speed of a port:
1 At the Top-level menu, enter:
ethernet portMode
The following prompt is displayed:
Select Ethernet port (1-24):
2 Enter the speed required:
Enter new value (100half,10half): 10half
Port speeds specified using the
portMode
command do not take
effect until auto-negotiation is disabled on the port. For more
information, see
“Enabling and Disabling Auto-negotiation”
on
page 59
.
Port Security Feature
You can enable and disable security features on an Ethernet port
using the
security
command on the Ethernet menu. These
security features are Disconnect Unauthorised Device (DUD) and
Need to Know (NTK).
Disconnect Unauthorised Device (DUD)
If a packet address is
seen on a port that is not known by the Hub (it has not been
learnt), that port will be disabled.