FEC Archives

5 07, 2023

SNR (RxMER) and DOCSIS 3.1 Modems

Mia Colabrese2023-07-05T16:32:25-04:00July 5th, 2023|

Welcome to another engaging episode of Get Your Tech On, titled "Your Questions, Our Answers: SNR (RxMER) and DOCSIS 3.1 Modems." In this episode, we delve into listener queries about DOCSIS technology, focusing on Signal-to-Noise Ratio (SNR), RxMER, and the details of DOCSIS 3.1 modems. Our host, Brady Volpe, founder of NimbleThis and The Volpe Firm, is joined by the highly knowledgeable John Downey, CMTS Technical Leader at Cisco Systems. Together, they explore the intricacies of these complex topics, helping to shed light on the common RF issues

It’s All About FEC

Mia Colabrese2018-06-01T08:21:05-04:00June 1st, 2018|

We have all heard the stories of how well DOCSIS 3.1 is working. Perhaps your system has been involved in one of these stories too. One thing is true, DOCSIS 3.1 is working really well — even better than we had anticipated. Here is why DOCSIS 3.1 is working really well — it is all about forward error correction (FEC). [For the purpose of this article we will only discuss error correction in the downstream] Reed Solomon forward error correction (RS-FEC) has been used in all previous generations

DOCSIS Reed-Solomon Codewords

Mia Colabrese2013-03-10T20:01:38-04:00March 10th, 2013|

How many bytes can a Reed-Solomon codeword bite? In my previous article on DOCSIS Codeword Errors, reader "Sandy" asked how many Reed-Solomon codewords would be required to transport a 1518 byte length of data? This is a very good question and one that I had never considered until I first faced when designing DOCSIS data-layer models in MATLAB. In the example I used in my previous article I chose a word that was 16 bytes long. I did this because it made it easy to draw an 8x8