3Com 3C16475BS User Manual - Page 44

Forgotten Password, Forgotten Static IP Address, Solving LED Issues, the port is off.

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44 CHAPTER 5: TROUBLESHOOTING Forgotten Password If you forget the password to the Web interface after you set it, you will need to reset the Switch to regain access. See "Resetting to Factory Defaults" on page 43 for instructions. After resetting the Switch, you can log on to the Web interface again using the default admin account settings: ■ User name - admin ■ Password - blank (no password) Forgotten Static IP Address If you forget the static IP address that you assigned to the Switch and you need to access the Web interface, use the Discovery application to automatically detect the IP address and connect to the interface. For information on using the Discovery application, refer to "Running the Discovery Application" on page 21. Solving LED Issues This section lists some issues that are related to the LEDs on the front panel of the Switch. For information on basic LED checks, refer to the following topics in Chapter 1: ■ (2) Module Active LEDs ■ (3) Link/Activity LEDs ■ (5) Power LED ■ (6) Duplex LEDs A link is connected, but the Link/Activity LED for the port is off. There is a problem with this connection. Verify that: ■ The device being connected to is powered on and operating correctly. ■ The cable is connected at both ends. ■ The cable is not damaged. ■ If the connection is to a workstation, that the workstation's network interface is installed and configured correctly. ■ The correct category of cable is being used for the required link speed. Category 3 cables can be used for 10BASE-T operation only. Category 5 cable is required for 100BASE-TX or 1000BASE-T. 3Com recommends Category 5e or 6 cables for 1000BASE-T operation. A fiber cable is connected, but the Module Active LED is off. Verify that: ■ The fiber cable is in good condition. ■ The SFP module is correctly inserted. ■ A 3Com SFP module is being used. Refer to "Approved SFP Transceivers" on page 18 for details. ■ The equipment at the far end is installed and correctly configured. The Link/Activity LED is on, but network performance is poor .

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44
C
HAPTER
5: T
ROUBLESHOOTING
Forgotten Password
If you forget the password to the Web interface after
you set it, you will need to reset the Switch to regain
access. See
“
Resetting to Factory Defaults
”
on
page 43
for instructions. After resetting the Switch,
you can log on to the Web interface again using the
default admin account settings:
■
User name –
admin
■
Password – blank (no password)
Forgotten Static IP Address
If you forget the static IP address that you assigned to
the Switch and you need to access the Web interface,
use the Discovery application to automatically detect
the IP address and connect to the interface.
For information on using the Discovery application,
refer to
“
Running the Discovery Application
”
on
page 21
.
Solving LED Issues
This section lists some issues that are related to the
LEDs on the front panel of the Switch. For informa-
tion on basic LED checks, refer to the following topics
in
Chapter 1
:
■
(2) Module Active LEDs
■
(3) Link/Activity LEDs
■
(5) Power LED
■
(6) Duplex LEDs
A link is connected, but the Link/Activity LED for
the port is off.
There is a problem with this connection. Verify that:
■
The device being connected to is powered on and
operating correctly.
■
The cable is connected at both ends.
■
The cable is not damaged.
■
If the connection is to a workstation, that the
workstation's network interface is installed and
configured correctly.
■
The correct category of cable is being used for the
required link speed. Category 3 cables can be used
for 10BASE-T operation only. Category 5 cable is
required for 100BASE-TX or 1000BASE-T. 3Com
recommends Category 5e or 6 cables for
1000BASE-T operation.
A fiber cable is connected, but the Module
Active LED is off.
Verify that:
■
The fiber cable is in good condition.
■
The SFP module is correctly inserted.
■
A 3Com SFP module is being used. Refer to
“
Approved SFP Transceivers
” on page 18
for
details.
■
The equipment at the far end is installed and cor-
rectly configured.
The Link/Activity LED is on, but network perfor-
mance is poor .