It seems like a hardware issue, unless you are seeing the same behaviour on both controller A and controller B.
Please open a case with NetApp support to see if the motherboard can be replaced.
If you see the same behaviour on both, then try enabling local echo on the hyperterminal program.
- On the HyperTerminal File menu, click Properties.
- On the Settings tab, click ASCII Setup.
- Check the Echo typed characters locally box.
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