X.25 on 2Mbit HSI port

Has anyone used X.25 + OSI + FTAM on the HSI port of an E4500 series (monoprocessor) at 2Mbit/s ?
For some reason, the link runs unstable at anything more than 64K. The HSI port 0 is connectet to a Sagem Megapack E15 supporting 2Mbit V.11 links. The other three ports are not connected.
If many FTAM associations are launched at the same moment, the E15 switch detects some problem after a while and restarts the link. This happens randomly, and apparently in direct relation to the CPU usage on the E4500.

X.25 is based on a bit synchronous serial (not lan) protocol and there are no standard java or javax packages that can be used to support it. The only thing I can suggest is looking at JNI calling out to some sort of library. Eicon (in Canada) use to sell very nice boards and libraries for a variety of platforms, but I haven't done anything with X.25 for about 8 years, so I am way out of touch.
Chuck

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