Network Adapter - LED Status

Network Adapter - LED Status

Use the below tables to determine the status of the Ethernet or Token-Ring adapter cards for diagnosing network problems.

Ethernet Card LED Status

LED Name - Status Explanation
LNK - On
LNK - Off
Sucessfully linked to the network
No link established. Check for:
Good network condition
Good cable between computer and network receptacle.
Ethernet adapter
Riser card
System board
ACT - On
ACT - Off
Activity present (Transmit and Receive data to and
from the network).
No activity.
100 TX - On
100 TX - Off
Network speed equals up to 100Mbps
Network speed equals up to 10Mbps

Token-Ring Card LED Status Adapter LED Status

Amber Green Explanation
The adapter is active and waiting for initialization.
Off Off The adapter initialization is in progress, the computer
is powered off, or the adapter is not active. Run LANAID
and verify the adapter's configuration. The adapter might
be configured for Plug and Play while the system is not
enabled for Plug and Play. Reconfigure a valid configuration
and store it to the adapter.
Off Blinking
The adapter did not detect any problems during its
self-diagnostic tests and is waiting to open.
If this LED state occurs after the adapter is open,
this state indicates that the adapter is closed.
Off On The adapter is open and operating correctly.
On Off The adapter self-diagnostics tests failed or there is a
problem with the adapter.
Off The adapter is closed. One of the following conditions
The adapter open failed.
The adapter detected a wire fault.
The adapter failed the auto-removal test.
On The adapter has detected beaconing or a hard error.

Token-Ring Table Terms and Definitions
Auto-removal    The state in which a token-ring adapter port removes itself
     from the network to perform self-tests to verify that it is not
     the cause of a hard error. If the tests are successfully,
     the port will reattach itself to the network.
Beaconing    The state that a token-ring adapter port enters after it has
     detected a hard error. The error condition is reported to the other
     devices on the network. Beaconing can result in the port removing itself
     from the network (auto-removal) to determine whether it is the cause
     of the hard error.
Hard error    An error condition on a network that requires removing the source
     of the error or reconfiguring the network before the network can
     resume reliable operation.
Initialization    The first step taken to prepare the port for use after the computer has
     been booted. During initialization, the port runs a series of internal
     self-diagnostic tests.
Open    The state in which the port has established connection with other
     devices on the ring.
Wire fault    An error condition caused by a break or short circuit in the cable segment
     that connects the port to its access unit, such as an IBM 8230 Token-Ring
     Network Controller Access Unit.

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