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41809fe43b4a7c53fa7e0f995496d10041c7d8b2
bf-infra/docs/messdaten/tp6-20260820/durchlauf1-ohne-call/sampler.csv
Christoph Emsenhuber cf44ce6a1e TP6 gemessen: Fall B, aber nicht hoerbar -- und der laute Befund liegt bei TP25 
Die TP6-Praemisse ist ausgefuehrt: drei Messreihen von einem kabelgebundenen
Client in VLAN10, zwei davon mit laufendem Telegram-Videocall an zwei Orten.

Ergebnis (Runbook §5): unter Dauer-Upload steigt die Latenz von 13 auf 40--60 ms,
im Download auf 36--41 ms. Das sind +28 bis +47 ms und damit ueber der Schwelle
von 30 ms, die §3 VOR der Messung festgelegt hat -- formal Fall B, CAKE ist
begruendet. Die Einschraenkung gehoert zur Zahl: durch alle sechs Lastphasen lief
ein Videocall, und es wurde kein einziger Problem-Button gedrueckt. Messbar ja,
wahrnehmbar nein. waveform sagt zeitgleich Grade A -- kein Widerspruch, sondern
ein kuerzerer Test, dessen Upload-Verteilung zweigipflig ist (25. Perzentil
14,5 ms, 75. Perzentil 47,5 ms).

Erstmals dokumentiert: die tatsaechliche Linerate. Upload 9,6 Mbit, Download
54,6 Mbit. Die im Repo kolportierten "~10 Mbit" galten immer nur dem Upload.

Der lautere Befund ist ein Nebenprodukt: der Core-Sampler hat 2,5 Stunden lang
das iPhone mitgeschrieben. Sticky Client (ein Weg durchs ganze Haus, dreimal
direkt an ap1 vorbei, eine einzige Uebergabe -- und die erst oben bei -73 dBm)
und Band-Ping-Pong (zwoelf Wechsel in neun Minuten am selben Ort). Je Wechsel bis
zu 4 s ohne Durchsatz -- als Obergrenze notiert, denn die Zaehler starten nach
einer Neuanmeldung bei null; der saubere Test per ping auf das Telefon steht aus.
Das passiert TROTZ aktivem 802.11k/v und FT, live geprueft: damit ist die
Merkregel ref_ft_is_not_roaming historisch. Der Bandabstand von 8--10 dB ist
dabei normale Physik; das Problem ist, dass 5 GHz an den Telefonier-Orten bei
-75 bis -80 dBm landet.

Zwei Messfehler bleiben dokumentiert, weil sie die Methode betreffen und beide
denselben Typ haben -- die Anzeige war gruen, die Wirkung fehlte:
speed.cloudflare.com/__down antwortet ohne User-Agent mit 403 und einem Byte
(saubere Ping-Reihe ueber tote Flows), und ein Call lief 5,5 Minuten ohne
Treiber (Marker geschrieben, nichts gemessen).

Status nachgezogen -- Header inklusive: TP6 von "Praemisse pruefen" auf
"gemessen, Fall B, nachrangig", TP25 auf kritischen Pfad. Rohdaten liegen unter
docs/messdaten/tp6-20260820/, damit die Zahlen nachpruefbar bleiben.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-21 00:31:13 +02:00

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