One warning about this: 
make sure there is an adapter cable connected on BOTH ends of the type 1
cabling; if you have a case where a disconnection is made on one of the
IBM connectors, you have a pair of ethernet loopback cables...

If your switch is set to full duplex, this may result in a packet
accelerator (you will suddenly run to maximal utilization everywhere
in that broadcast domain ...)

Likewise if you have autonegotiate enabled, and do not disable FD as
possibilities, you may find a similar situation.

(I have experienced and tracked this down due to some other person's
(serial) errors) 

If you intend to go 100Mb over Type1, I would recommend
that you nail your type 1 connected ports to Half Duplex only, that way if
something is disconnected improperly, you will not cripple your entire
broadcast domain... instead the port will light up like a christmas tree
(with collisions)... which I prefer greatly to the alternative of losing a
whole broadcast domain....




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