The cables are most likely type/cat 1. With a token ring type A connector.
They are very obsolete.
Here is a web page with the various types of type 1 cable ends.
http://www.pacificcable.com/TokenRing.htm
Note that type/cat 1 is shielded twisted pair and in fact is much better
then Cat 5 cable as it is shielded. If memory serves correctly, the max
length is 1500 feet for token ring, on this type cable.

bob in phx


"Michael Kennedy" wrote in message
...
I have a few IBM network cables with square connectors on the end. I
believe it is some form of token ring but I have no idea what the connector
is called. Is there any demand for these cables? I got it from a closing
grocery store.