This informational dialog shows the time domain parameters (TDR responses) that are currently available for your specific DUT setup diagram (shown in the TDR Setup dialog box). These available time domain parameters can be selected for display in the TDR Setup dialog box and selected for calibration in the TDR Calibration dialog box.

For differential setups, the dialog shows both the available single-ended and differential time domain parameters that can be displayed and calibrated. For single-ended setups, the dialog only includes the available single-ended time domain parameters.

The dialog identifies all possible time domain parameters, which are determined by the number of ports on the DUT. Time domain parameters become available (highlighted) by activating TDR steps in the DUT setup diagram. Only those parameters that are highlighted are available for display. Parameters that are dim are not available. For example, in the above pictures, the T11 and TDD11 responses are available, but the T12 and TDD12 responses are not. To enable more responses, you must turn on the associated TDR steps in the DUT setup diagram.

The following examples show all of the time domain parameters that could be available for selected DUTs. If you are unfamiliar with time domain parameter names, you may find this section helpful.

Example of Time Domain Parameters on Single Ended 4-Port DUT

There are 16 possible time domain parameter responses for this DUT. When using an N1055A TDR module all 16 responses could be simultaneously displayed.

Single Ended Time Domain Parameters (4-Port DUT)

DUT Setup Diagram	Time Domain Parameter	Response Description
Port 1 Step: On	T11	Return loss
	T21	Insertion loss
	T31	Near-end cross talk
	T41	Far-end cross talk
Port 2 Step: On	T12	Insertion loss
	T22	Return loss
	T32	Far-end cross talk
	T42	Near-end cross talk
Port 3 Step: On	T13	Near-end cross talk
	T23	Far-end cross talk
	T33	Return loss
	T43	Insertion loss
Port 4 Step: On	T14	Far-end cross talk
	T24	Near-end cross talk
	T34	Insertion loss
	T44	Return loss

Example of Time Domain Parameters on Differential 2-Port DUT

There are 16 possible differential and common-mode time domain parameter responses for this DUT. Because this is a differential DUT, 16 single-ended time domain parameter responses are also available. Therefore, a total of 32 possible time domain parameters are available for this DUT. When using an N1055A TDR module, all 32 responses could be simultaneously displayed.

Differential Time Domain Parameters (2-Port DUT)

DUT Setup Diagram	Time Domain Parameter	Response Description	Time Domain Parameter	Response Description
Port 1 Step: On	Differential Stimulus		Commom-Mode Stimulus
	TDD11	Diff. return loss	TDC11	Diff. return loss
	TDD21	Diff. insertion loss	TDC21	Diff. insertion loss
	TCD11	Comm. return loss	TCC11	Comm. return loss
	TCD21	Comm. insertion loss	TCC21	Comm. insertion loss
Port 2 Step: On	Differential Stimulus		Commom-Mode Stimulus
	TDD12	Diff. return loss	TDC12	Diff. return loss
	TDD22	Diff. insertion loss	TDC22	Diff. insertion loss
	TCD12	Comm. return loss	TCC12	Comm. return loss
	TCD22	Comm. insertion loss	TCC22	Comm. insertion loss

Example of Time Domain Parameters on Differential 4-Port DUT

For this DUT, a total of 128 time domain parameter responses are possible including 64 single-ended and 64 differential. There is a maximum limit of 64 responses can be acquired at a single time. So, when two N1055A modules are used, all eight cables are connected to the DUT but only two TDR incident steps can be activated.

Differential Time Domain Parameters (4-Port DUT)

DUT Setup Diagram	Time Domain Parameter	Response Description	Time Domain Parameter	Response Description
Port 1 Step: On	Differential Stimulus		Common-Mode Stimulus
	TDD11	Diff. return loss	TDC11	Diff. return loss
	TDD21	Diff. insertion loss	TDC21	Diff. insertion loss
	TDD31	Diff. near-end cross talk	TDC31	Diff. near-end cross talk
	TDD41	Diff. far-end cross talk	TDC41	Diff. far-end cross talk
	TCD11	Comm. Return loss	TCC11	Comm. Return loss
	TCD21	Comm. insertion loss	TCC21	Comm. insertion loss
	TCD31	Comm. near-end cross talk	TCC31	Comm. near-end cross talk
	TCD41	Comm. far-end cross talk	TCC41	Comm. far-end cross talk
Port 2 Step: On	Differential Stimulus		Common-Mode Stimulus
	TDD12	Diff. insertion loss	TDC12	Diff. insertion loss
	TDD22	Diff. return loss	TDC22	Diff. return loss
	TDD32	Diff. far-end cross talk	TDC32	Diff. far-end cross talk
	TDD42	Diff. near-end cross talk	TDC42	Diff. near-end cross talk
	TCD12	Comm. insertion loss	TCC12	Comm. insertion loss
	TCD22	Comm. return loss	TCC22	Comm. return loss
	TCD32	Comm. far-end cross talk	TCC32	Comm. far-end cross talk
	TCD42	Comm. near-end cross talk	TCC42	Comm. near-end cross talk
Port 3 Step: On	Differential Stimulus		Common-Mode Stimulus
	TDD13	Diff. near-end cross talk	TDC13	Diff. near-end cross talk
	TDD23	Diff. far-end cross talk	TDC23	Diff. far-end cross talk
	TDD33	Diff. return loss	TDC33	Diff. return loss
	TDD43	Diff. insertion loss	TDC43	Diff. insertion loss
	TCD13	Comm. near-end cross talk	TCC13	Comm. near-end cross talk
	TCD23	Comm. far-end cross talk	TCC23	Comm. far-end cross talk
	TCD33	Comm. return loss	TCC33	Comm. return loss
	TCD43	Comm. insertion loss	TCC43	Comm. insertion loss
Port 4 Step: On	Differential Stimulus		Common-Mode Stimulus
	TDD14	Diff. far-end cross talk	TDC14	Diff. far-end cross talk
	TDD24	Diff. near-end cross talk	TDC24	Diff. near-end cross talk
	TDD34	Diff. insertion loss	TDC34	Diff. insertion loss
	TDD44	Diff. return loss	TDC44	Diff. return loss
	TCD14	Comm. far-end cross talk	TCC14	Comm. far-end cross talk
	TCD24	Comm. near-end cross talk	TCC24	Comm. near-end cross talk
	TCD34	Comm. insertion loss	TCC34	Comm. insertion loss
	TCD44	Comm. return loss	TCC44	Comm. return loss