Performance of CSMA with priority acknowledgements on intrabuilding power line local area networks
Bibliographic record
Abstract
The use and performance of carrier-sense multiaccess (CSMA) with priority acknowledgements (PA) for medium access control on intrabuilding power-line communication networks are described. Such networks, while universal in building coverage at no incremental installation cost and readily accessed, suffer from highly variable unpredictable signal-to-noise ratio. The architecture of the CSMA implementation is discussed, along with its advantages relative to token-passing or polling-access control schemes. Choice of the best packet length, in terms of throughput maximization, approximates 1000 bits. Delay-throughout performance is measured, and the effects of performance of the power-line channel behavior are ascertained. Extensive tests were conducted using channel bit rates from 1200 to 9600 b/s, with FSK (frequency-shift keyed) and spread-spectrum PSK (phase-shift keyed) modems transmitting at 3 V rms at frequencies ranging from 40 to 120 kHz. Included are results for potentially difficult cases involving transmissions across power phases.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".