The UNH-IOL developed a series of Electrical Characteristics Measurement Tools for the DSL Testing Service as a general-purpose test tool to measure to measure the electrical properties of DSL equipment. It allows the measurement of complex input impedance, longitudinal balance, return loss, PSD mask conformance, attenuation, phase response, and group delay. It combines an easy-to-use graphical interface for the network analyzer with useful features to expedite and clarify data analysis.
PSD Mask Conformance
Provides an easy to use, graphical interface, to measure and compare a device's transmitted PSD against the standards reference requirements. The software includes reference masks for ADSL, ADSL2/2plus, and VDSL2, including all regional options. The software can also apply either upstream power back off (UPBO) and/or downstream power back off (DPBO) parameters to the reference mask verify these features within the device under test as well. Sliding window power measurements are also supported, allowing the tool to be used to directly perform testing according to the Broadband Forum's test plans.
Longitudinal Balance Measurements
Used to measure the longitudinal balance of one-port devices. With a well-balanced balun and a longitudinal bridge, a common mode voltage is applied to the DUT and the resulting differential voltage is measured. The ratio of these two voltages is called longitudinal balance and is a measure of how well the DUT rejects common mode noise.
Input Impedance Measurements
Tho measure the complex input impedance of one-port devices. Input impedance measurements allow the following display formats:
- Impedance (real component)
- Impedance (imaginary component)
- Impedance (magnitude)
This tab is used to measure the reflection coefficient of devices using a one-port technique. The reflection coefficient can be evaluated with respect to an arbitrary load impedance. Reflection measurements allow the following display formats:
- Reflection coefficient (real component)
- Reflection coefficient (imaginary component)
- Return Loss
Frequency Response Measurements
This tab is used to measure the frequency response of two-port devices. Frequency response measurements allow the following display formats:
- Magnitude Response
- Phase Response
- Group Delay