First of all thanks to the following for replying:
The original query was why was I getting the error message:
HIH0: xmit hung, donebits=0
As I had suspected, and speculated in my original question, the problem
was missing clock signals from the DCE. The cable was fine. I found this out
a couple of hours after posting the original question!
No-one mentioned which RS-449 -> X.21 cable to use (the diagrams in
the Sun X.25 Administrators Guide and the HSIS Installation Guide are
different). I used a cable made up to the specification in the HSIS Installation
Guide and it worked fine for me - I'd recommend using that one.
One interesting comment was that patch 100328 is now up to revision
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