Docsis 3.1 in 2016

anoniem zei:

https://www.dslreports.com/forum/r28661881-Extreme-305-65-now-505-100

om een idee te geven wat de technology nu al kan

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Briolet zei:

Toch is 2016 dichtbij en zal betekenen dat als er nu essentiële hardware vervangen wordt, dit hier al op voorbereid moet zijn. Anders kun je dat over 3 jaar weer vervangen.

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jojootje zei:

En nog even een sneer, zie je het al gebeuren, de hele straat met 500Mb tegelijk downloaden? Het is geen glas wat in die groene kabels zit. Daarvoor moet ie oranje zijn.
Opschieten sleuvengravers svp.

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grunnsat zei:

Ja, je kunt hele hoge snelheden halen, maar dan heb je ook heel veel bandbreedte nodig. Docsis 3.1 is efficiënter dan Docsis 3.0, maar slechts zo'n 50%. Je moet je dus afvragen of al die bandbreedte er wel is.

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DOCSIS 3.1: Begin Preparing Now

Posted on September 11, 2013 by Carl Weinschenk-BTR

Experts believe that DOCSIS 3.1 is few years off. The specification has not yet been finalized. After that, test and early customer premise equipment (CPE) and corresponding CMTS and CCAP line cards will be sprinkled through systems. The bottom line is that it will be a long time until DOCSIS 3.1 is an element of everyday cable operations.

So preparations should start now.

The industry has been down this road before. What seems like a long road, with plenty of cushion for adjustment, is deceptively short: The great change that the new technology brings demands equally great preparation to the plant, which must be in top shape when the first modems appear.

There are a couple of reasons that DOCSIS 3.1 requires operators to start preparing their plant early in the process:

• The new protocol’s two modulation schemes – orthogonal frequency division multiplexing in the downstream and orthogonal frequency division multiple access in the upstream – are more robust than the QAM and QPSK techniques used in DOCSIS 3.0. This ruggedness makes higher orders of modulation possible. These streams, which can offer densities of 512-QAM, 1024-QAM, 2048-QAM and even 4096-QAM, are increasingly sensitive. Problems such as packet errors are increasingly likely to occur, especially if the plant isn’t in great shape. In some cases, a poor platform will totally disrupt service. In others – perhaps most – DOCSIS 3.1 will fail back to a previous version of the standard.
• DOCSIS 3.1, as all DOCSIS protocols, will be backward compatible to earlier iterations specification. Thus, the amount of DOCSIS traffic will build. Poorly maintained systems will be hard pressed to support this gradually increasing traffic.

Brady Volpe, the principal of The Volpe Firm, suggests that a great deal of preparatory work for DOCSIS 3.1 is the type of block-and-tackling that operators have been doing since the industry was born. “A lot of networks today may be using 256-QAM, but if you look at the spread, you see a bunch of cable modems that have low MER (modulation error ratio) and are just on the edge of staying online,” he said. “Cable operators need to tighten up the plant to get the modems on the low side onto the Six Sigma curve.”

Volpe sees the way of setting up the infrastructure to succeed when DOCSIS 3.1 arrives as doing the basics. “We need to replace Fabry-Perot lasers with DFBs (distributed feedback lasers) and eliminate ingress noise. Today in DOCSIS 3.0, we are starting to do more channel bonding and are having problems. If operators think that DOCSIS 3.1 will make this better, they are very, very wrong. It is only going to make them worse.”

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