DOCSIS 3.1 Kanal für Upload nun verfügbar?

[Webmark]

Also, ich bin wieder zufrieden (bis zum nächsten Rückkanalstörer) und bin nun gespannt auf das Preisschild für den 100er Upload.

Danke für die Rückmeldung und ja, auf den Preis für einen höheren Upload bin ich ebenfalls gespannt.

[Yoshi2000]

Ich kann für verschiedene Anschlüsse hier auch die Beobachtung von Webmark bestätigen.

An meinen Anschluss ist sowohl mit dem TC4400 und auch der Vodafone Station der ODFMA Kanal mit weniger Pegel.

TC4400: Docsis 3.0 - 43.0 dBmV | Docsis 3.1 37.0 dBmV
Vodafone Station: Docsis 3.0 - 41.5 dBmV | Docsis 3.1 37.5 dBmV

Andere Anschlüsse mit Fritzbox oder Vodafone Station zeigen hier auch eine Differenz von 4 bis 7 dBmV.

[Flole]

Ach, auf einmal erkennst auch du eine Differenz?

Die habe ich schon vor einiger Zeit erkannt und dir erklärt, dass sie angezeigt wird weil es sich auf was anderes bezieht, aber sobald man es normalisiert wieder verschwunden ist.

[Flole]

An meinen Anschluss ist sowohl mit dem TC4400 und auch der Vodafone Station der ODFMA Kanal mit weniger Pegel.

Nein ist er nicht.... Der Pegel ist immer noch identisch, man bezieht sich lediglich auf eine andere Bandbreite bei der Anzeige (immer noch).

[Webmark]

Ich kann für verschiedene Anschlüsse hier auch die Beobachtung von Webmark bestätigen.

Danke für deinen Beitrag!

[denunge]

What Flole says is very relevant. The reported power depends on how many Hz it is measured across. A 6.4 MHz block contains more energy than a 3.2 MHz block.

6.4 MHz vs 1.6 MHz is a difference in power of 6 dB (4 x bandwidth). Modems often use P6.4 for legacy channels and P1.6 for OFDMA channels in the web interface. The signal is not "weaker" just because it is 6 dB lower. It is just displayed differently.

The total power in the OFDMA channel is actually greater than in the legacy channels, because it is much wider.

[gendel2]

What Flole says is very relevant. The reported power depends on how many Hz it is measured across. A 6.4 MHz block contains more energy than a 3.2 MHz block.

6.4 MHz vs 1.6 MHz is a difference in power of 6 dB (4 x bandwidth). Modems often use P6.4 for legacy channels and P1.6 for OFDMA channels in the web interface. The signal is not "weaker" just because it is 6 dB lower. It is just displayed differently.

The total power in the OFDMA channel is actually greater than in the legacy channels, because it is much wider.

Many thanks for the explanation. That sounds convincing to me. If only Flole had described it in the same detailed manner, the dispute could have come to an end way earlier. Instead, he chose to only make indirect remarks, which were unclear - at least to me…

[robert_s]

What Flole says is very relevant. The reported power depends on how many Hz it is measured across.

But we're not talking about power, we're talking about dBmV. From what I read, this is a logarithmic representation of the relation between the minimum and maximum voltage levels. I do not see any relation to time, and thus bandwidth.

E.g. if a signal is defined to be between +5V and -5V, the power required to generate the signal may vary with the resistance of the medium and the frequency at which you change the signal levels and thus the signal bandwidth - but the +5V and -5V parameters are unaffected by that.

Can you explain where the relation between dBmV and time|bandwidth comes from?

[denunge]

dBmV is actually a measurement of power. The number itself doesn't say anything about the bandwidth - that must be defined elsewhere. DOCSIS 3.1 says that the modem must report (to the CMTS) what the power is per 1.6 MHz.

[Flole]

If only Flole had described it in the same detailed manner, the dispute could have come to an end way earlier. Instead, he chose to only make indirect remarks, which were unclear - at least to me…

I did explain multiple times that it's referring to a different bandwidth. If it's unclear to you then you're free to do additional research, the specifications are public, or ask specific questions about whatever might be unclear to you. I'm not going to spoon feed you all the information.