Hello Reinhold,
As per this document, this product has not been supported since end of 2006. (
http://www.cisco.com/en/US/products/hw/ps4159/ps2160/prod_eol_notice09186a008032d51b.html)
So unfortunately, I cannot help you obtain these drivers.
I would like to help you with this, can you explain a bit more what you are testing and what your setup is, maybe we can find a workaround together.
Best regards,
Kris
