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.>
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.009 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".