DOI: 10.5281/zenodo.18329468
title: GAL-2 Solstice 7-Day Run - Holdover Evidence Plots vs NTP

description: This dataset comprises the conclusive evidence plots derived from the GAL-2 Solstice 7-Day continuous run.

 

The dataset includes the following plots:

 

• Absolute offset versus NTP (time domain)

• Holdover error envelope versus NTP (µs → ms)

• Robust MTIE versus averaging time τ

 

All plots are referenced to NTP and exhibit bounded, non-diverging behavior relative to that reference over a 7-Day continuous run.

 

It is important to note that this dataset does not assert absolute UTC traceability and is intended solely for independent technical review purposes.
description: Technical Note (Units, Experimental Context, and Interpretation)

 

All raw time-offset measurements in this dataset are produced internally in microseconds (µs).

 

For visualization clarity, selected figures display values converted to milliseconds (ms) using a linear conversion:

ms = µs divided by 1 000.

 

The conversion is applied once, prior to aggregation and plotting. No figure mixes units within the same axis.

 

Figure units summary:

• Absolute Offset vs NTP: raw data in µs, displayed in ms

• Holdover Error Envelope vs NTP: raw data in µs, displayed in ms (explicitly noted as “µs → ms”)

• MTIE vs averaging time τ: raw data in µs, displayed in ms

 

Experimental context:

 

These figures correspond to a 7-day continuous robustness stress test and are not intended to represent NTP behavior under ideal, production, or telecom-grade synchronization conditions.

 

The experiment intentionally subjects the estimator to extreme NTP jitter and outliers, simulating adverse network environments such as high latency, congestion, asymmetry, and burst noise. The objective is to evaluate robust blocked estimation and holdover behavior under worst-case reference noise, not to optimize short-term precision.

 

Time base, aggregation, and windows:

 

All timestamps are UNIX epoch timestamps in UTC. Time-domain plots use “Time since start (hours)” derived from epoch deltas. Envelope and absolute-offset figures use non-overlapping 5-minute windows. Aggregations per window are explicitly defined in the plotting scripts (for example: max, min, absolute value). No temporal gaps or resampling are introduced beyond the stated windowing.

 

Holdover error envelope interpretation:

 

In the Holdover Error Envelope vs NTP figure, the shaded envelope represents the predicted uncertainty bounds produced by the robust blocked estimator under noisy reference conditions. The overlaid line represents the estimated residual offset during holdover operation, reflecting local clock drift compensation performed by the estimator. The figure demonstrates bounded behavior despite extreme reference noise, not adherence to tight phase masks.

 

MTIE interpretation:

 

The MTIE vs averaging time τ figure is computed using a robust blocked estimation approach and characterizes worst-case bounded error growth under noisy reference conditions. This plot is not intended to demonstrate compliance with classical telecom timing standards (such as ITU-T G.811 or G.823), but to document estimator behavior in a high-noise regime.

 

Data sources and reproducibility:

 

All figures are derived from the CSV data included in the accompanying ZIP archive. A README file in the archive documents the scripts and steps used to reproduce the figures. No post-publication modification of data has been performed.

 

Traceability disclaimer:

 

This dataset does not claim absolute UTC traceability. It is provided exclusively for methodological evaluation, robustness analysis, and independent technical review.
description:  

Additional Technical Clarification (Units and Aggregation)

 

 

All clock offset values were measured internally in microseconds (µs).

For visualization purposes, selected figures display values in milliseconds (ms), using the conversion:

 

ms = µs / 1000

 

This conversion was applied prior to aggregation and metric computation, including envelope bounds and MTIE estimation. No figure mixes units within the same axis.

 

Time-domain envelopes and absolute offset plots were computed using non-overlapping 5-minute windows, where reported values represent window extrema (max/min or max|offset| as indicated).

 

These figures are intended to characterize system behavior under extreme reference noise and outlier conditions and do not claim absolute UTC traceability.