| DecascadeLeftT(SParamDataAndNoiseParamDataT, SParamDataAndNoiseParamDataT) | Decascades a from the left side of ab |
| DecascadeLeftT(SParamDataAndNoiseParamDataT, SParamDataAndNoiseParamDataT, SParamDataT) | Decascades a from the left side of ab using known S-Parameters of b |