Cabletron Systems STHI User Manual

Page 5-26

5

Internal errors may be detected by the adapter’s hardware and/or 
firmware. These errors cause the adapter to remove itself from the ring 
and indicate a problem with the adapter hardware or firmware.

Frames reporting non-isolating errors do not provide sufficient 
information to determine the physical domain of a fault. These errors are 
common soft errors, meaning that they are to be expected and can be 
overcome by normal Token Ring operations. While they will not 
completely halt a network, excessive non-isolating errors reduce a 
network’s efficiency.

1

A Lost Frame Error may indicate that an adapter did not detect the return 
of the end of a frame it transmitted; the frame was lost somewhere on the 
ring. This can be caused by stations entering or leaving the ring. 
Replacement frames are automatically generated.

2

A Frame Copied Error may indicate that a station received a frame with its 
address as the destination, but the address recognized indicator bits were 
not set to zero. This is primarily caused by stations having duplicate 
physical addresses (at least one of which would be a Locally Administered 
address). All MAC addresses are unique. Ensure that any Locally 
administered addresses assigned do not duplicate another network 
device’s physical address.

3

A Rcvr Congestion Error may indicate that a station has 
received/repeated a frame addressed to it, but had no buffer space 
available to copy the frame. Replacement frames are automatically 
generated, but an excessive amount of these errors may indicate a 
hardware problem.