A similar problem seems to be reported here 4 years ago: https://supportforums.cisco.com/discussion/10910226/sf100d-05datastream-problem

We have exactly the same problem when connecting this switch to a FitPC3 http://www.fit-pc.com/web/products/fit-pc3/We have tested it with different switches of that type, with different cables and with different FitPCs. No SF100D-05 works with any F...