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
LNK - On
LNK - Off
Sucessfully linked to the network
No link established. Check for:
Good network condition
Good cable between computer and network receptacle.
ACT - On
ACT - Off
Activity present (Transmit and Receive data to and
from the network).
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
The adapter is active and waiting for initialization.
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.
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.
The adapter is open and operating correctly.
The adapter self-diagnostics tests failed or there is a
problem with the adapter.
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.
The adapter has detected beaconing or a hard error.
Token-Ring Table Terms and Definitions
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.
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.
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.
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
The state in which the port has established connection with other
devices on the ring.
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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