QPHY-10Base-T1-TDR

The Return Loss is measured at the medium dependent interface (MDI), which is the ratio between the power of the differential signal that is reflected due to impedance mismatch and the power of the differential incident signal (differential to differential). Additionally, the differential characteristic impedance is measured, which for a 10Base-T1S and 10Base-T1L compliant device will ideally be 100ω.

The Mode Conversion Loss is measured at the MDI, which is the ratio between the power of the differential signal that is reflected due to impedance mismatch and the power of the incident common mode signal (common to differential) for both the DUT as well as the test fixture alone. Additionally, the differential and common mode characteristic impedance is measured, which for a 10Base-T1S and 10Base-T1L compliant device will ideally be 100ω and 25ω respectively.

 

The impedance balance of the cabling and test fixtures in the test setup when measuring the MDI S-parameters and the mode conversion loss is critical. WavePulser 40iX measures the impedance profile of cables and test devices to ensure that the paths of the two signals D+ and D- are identical so that there is no mode conversion generated from a difference in electrical. The precise characterization of the test fixtures used to connect the DUT MDI to the test equipment provides confidence that the fixtures in use has enough mode conversion loss margin compared to the MDI requirement.

主要特性

• 支持 10Base-T1S 和 10Base-T1L (IEEE 802.3cg)
• 高度自动化且易于使用
• 内置自动 S 参数校准
• 自动将电缆反嵌到测试夹具
• 生成带有通过/失败结果的报告
• 支持所有 MDI S 参数测试
  • MDI 回波损耗 (S _dd11)
  • MDI 模式转换损耗 (S _dc11)

自动化一致性测试

QPHY-10Base-T1-TDR 根据 10Base-T1S 和 10Base-T1L 执行物理媒体附件 (PMA) 的 MDI S 参数一致性测试。 详细的连接图确保正确设置。 测试会话完成后，结果会自动编译成包含屏幕截图的综合通过/未通过报告。

S 参数自动校准和电缆去嵌入

QPHY-10Base-T1-TDR 自动执行所需的参考平面校准，并自动去嵌入用于连接测试夹具的电缆。

MDI 回波损耗 (S_dd11) 简化的合规性测试

回波损耗是在介质相关接口 (MDI) 处测量的，它是由于阻抗失配而反射的差分信号功率与差分入射信号（差分对差分）的功率之间的比率。 此外，还测量了差分特性阻抗，对于 10Base-T1S 和 10Base-T1L 兼容设备，理想情况下为 100ω。

MDI 模式转换损耗 (S_dc11) 简化的合规性测试

模式转换损耗在 MDI 处测量，它是由于阻抗失配而反射的差分信号功率与 DUT 和单独测试夹具。 此外，还测量了差模和共模特性阻抗，对于 10Base-T1S 和 10Base-T1L 兼容设备，理想情况下分别为 100ω 和 25ω。

可靠的测试夹具表征

在测量 MDI S 参数和模式转换损耗时，测试设置中布线和测试夹具的阻抗平衡至关重要。 WavePulser 40iX 测量电缆和测试设备的阻抗曲线，以确保两个信号 D+ 和 D- 的路径相同，从而不会因电气差异而产生模式转换。 用于将 DUT MDI 连接到测试设备的测试夹具的精确表征提供了信心，即与 MDI 要求相比，使用中的夹具具有足够的模式转换损耗裕度。