Teraspeed Labs provides modeling and measurements services to the Signal Integrity community.
We have produced over 16,000 measurement based IBIS models for a variety of semiconductor vendors and end user companies for Signal Integrity Analysis.  Teraspeed Labs also provides SPICE to IBIS services.
Teraspeed Labs also has the ability to characterize devices in both the time and frequency domain.  Whether you are looking for discontinuities in high speed signal nets in the time domain or are trying to characterize insertion loss in the frequency domain we have the tools and experience.
Teraspeed Labs 
Measurement and Modeling Services