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Plugged Token Ring Card into Ethernet Network

Plugged Token Ring Card into Ethernet Network

(OP)
Some genius at my company plugged a Token Ring 16/4 card into our TCP/IP Ethernet Cisco Switch (3500XL) without telling anyone.  When I went to troubleshoot the "slow connectivity" they were getting, I realized what he did.  First of all, I am very suprised that it works.  When the switch is at 10/half, it works, but is slow.  Any other setting degrades activity or stops it.  

To convert this system to ethernet, they are talking about a $10,000 cost to upgrade so it probably won't happen.

What harm can be done by allowing a token ring NIC to be plugged into an ethernet switch?  And can I do anything to improve my link?  

Sorry, very little (actually, next to none) knowledge of token ring.

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