RS/6000 Ethernet board, how do you activate the thick wire port

[R CC]

Recently I installed a RS/6000 model 320.  The ethernet board has both
a thick wire and a thin wire port.  The thinwire port is located at the
bottom of the board.  The board is located between a scsi adapter and a
Display adapter. 


The problem is that it is close to impossible to place a T connector on
the thinwire port.  There is a bottom plate that prohibits the T.  Right now
I have the T crammed into the back of the machine.  This is not a desirable
situation.  I am afraid that eventually the thin wire will short.  I tried 
to utilize the thickwire port and got no response.  When I changed over to
thinwire the network worked fine.  I also tried using a thick wire port
on a 530, same problem.  Is there a change to the board (like a jumper setting)
needed to utilize the thickwire port?

Short of using thickwire I could rearrange the board placement on the bus
so that the thinwire port would not be inhibited.  Is the board placement
on the bus specific?

The ethernet board is fine for the larger units, but on the 320 it is badly
designed.  If the thick and thin wire ports were changed there would be no
problem.


Gina Boice
Colorado School of Mines
gboice at Mines.Colorado.EDU