OFDM MER Minislot (DOCSIS 4.0 Upstream)

DOCSIS 4.0 Upstream OFDM MER Minislot trace shows the Modulation Error Ratio (MER) per Minislot. The unit of the X-axis is the minislot index, and the value of the Y-axis is the averaged MER per Minislot. The X axis of MER vs Minislot starts from 0 and ends with the number of maximum active minislots. The Y-axis is in dB for MER.

You can limit the number of symbols included in the measurement analysis data results using the Result Length, Measurement Interval, and Measurement Offset parameters.

Markers

When a marker is added to the trace, a banner of data appears at the top of the trace in green text. The marker results are described in the table below:

Marker Results	Description
Mkrn	specifies the marker index.
n minislot	specifies the minislot number at the marker's current position.
Data Result	This is the average MER(dB) for the minislot at the marker's current position.

Trace Color coding Scheme

A multi-color coding scheme is used to make it easy to visually identify common symbols, subcarriers, and data results within various OFDM Traces. This makes cross trace data comparisons and analysis easy to accomplish. Different colors are assigned to symbols representing a common subcarrier type including: Pilot and Data subcarrier types. Some common color scheme Traces include: Error Vector Spectrum, Error Vector Time, and IQ Meas.

You can also customize and re-assign Trace colors schemes, see the Display Preferences Color tab (click Utilities > Display Preferences > Color tab and select a new color for the active Mod Type element).