The LowPass Chebychev Type 11 Filter
This design method is based upon tables and post optimisation. This is because choice of zero placement and exact Fstop can be tricky for the higher orders. As a server application this is a nono. The method is not perfect so
if a design calculation takes a time, results in a very small value component or a slight ripple in the passband, adjust Fstop within the order range