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DOCSIS 3.1 uses OFDM(A); this blog explains the basics of multiplexing, modulation and multiple access used with this new technology.
The CM-STATUS feature is of significant value in DOCSIS 3.x networks. However, originally it was designed in a way it was not 100% reliable. A specification addition in March 2014 changed this messaging facility and it was further fine-tuned in August 2014. This blog post provides an overview on why and how.
If you ask cable people for the differences between DOCSIS and EuroDOCSIS, the only thing they can typically think of is the difference in downstream channel width: 6 MHz for DOCSIS, 8 MHz for EuroDOCSIS. In reality there’s a lot more to it, as we will discuss in this blog post!
With climate changes and possible blackouts in Belgium, saving energy is becoming ever more important. So how can the Cable world contribute? The future standard, DOCSIS 3.1, promises advanced energy saving features using DOCSIS Light Sleep (DLS) mode. No need to wait though, the current specification (DOCSIS 3.0) already provides a mechanism to reduce cable modem power usage: Energy Management 1×1. Let’s take a closer look.
Will it turn out to be a marathon, or will 10 miles do this time? If understanding DOCSIS 3.0 was running 10 miles, how far will I need to run before I understand 3.1? Is the terrain rough and hilly or will it be a walk in the park?
While working with DOCSIS systems it is important to understand the upstream periodic ranging process. Ranging can be seen as the DOCSIS heartbeat between Cable Modem (CM) and Cable Modem Termination System (CMTS). As many people tend to struggle with the details of this process, the goal of this article is to visualize the periodic ranging process. Lets take a closer look at that ranging process – and let’s try to understand where things can go wrong during this DOCSIS heartbeat.
Cable modems get their operational parameters using config files. These config files define what the internet subscription will be, what additional services are activated and other configuration details. This blog post will get you started creating your own modem config file.
This blog post shows how to configure the ISC DHCP server to provision cable modems. Cable modems use DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings, including a number of DOCSIS-specific DHCP options.
More is better! It's true for many things, and the upstream frequency range for (Euro-)DOCSIS is one of those things, but like so often in life, it doesn't come for free. When considering extending this range it's good to know the benefits, possible issues you may encounter, and the alternatives. That is exactly what this article offers.
Extended upstream power allows 3.0 cable modems to transmit upstream bursts at higher powers than previously established. This feature has been added some time after the introduction of EuroDOCSIS 3.0. But why? Do we need higher powers now than before?