Balun-less measurement methods@ nomenclature@ and fixtures are defined for measurement of transmission parameters of four-pair (16 port) devices typically utilizing multi-port network analyzers. The methods and fixtures have been shown to facilitate measurement of all differential mode@ mixed mode@ and common mode transmission parameters. Test interface performance specifications up to 2 GHz are provided by this document. Purpose Removal of the balun transformers from the measurement circuit allows extension of the bandwidth of testing (both low and high frequencies) to the inherent capabilities of the network analyzer and associated test fixtures. Elimination of baluns also allows the DUT to be tested with both differential mode stimulus or response@ or common mode stimulus or response. This enables testing of mixed mode parameters such as TCL@ TCTL and cross-modal NEXT and FEXT couplings without reconfiguration of the DUT or the measurement setup. Additionally@ the measurement data can be transformed into any required impedance environment@ as explained in Annex C.