DOCSIS 3.1 Archives

20 08, 2021

Cisco vCMTS

Mia Colabrese2021-08-23T11:57:31-04:00August 20th, 2021|

Cisco vCMTS? Brady Volpe founder of The Volpe Firm and Nimble This, John Downey and Jason Miller Technical Marketing Engineer of Cisco discuss Cisco's virtual CMTS (vCMTS). The topic came up during ANGACOMs 2021 presentation. I didn't know Cisco even had a vCMTS, did you? Well, let's find out what they are doing and if they are really taking away the CLI as discussed at ANGACOM. The discussion is on all things DOCSIS. Tips, suggestions and recommendations. Another power hour of cable with Brady Volpe and John Downey CMTS

15 07, 2021

DOCSIS Primary Channel Impaired Downstream Troubleshooting

Mia Colabrese2023-02-17T18:41:43-05:00July 15th, 2021|

In this episode Brady and John discuss what happens to an impaired DOCSIS Primary channel & ANGA COM highlights. When an impaired DOCSIS Primary channel occurs, do to one ore more impairment, how does it impact other DOCSIS channels? Primary being a type of "management" SC-QAM channel. Does it make a difference? We also cover the top content from the ANGA COM show. Didn't have time to watch all of the ANGA COM show material. No problem. Brady and John will make sure your up to speed

3 06, 2021

Recommendations to resolving DOCSIS 3.1 cable modems crashing with OFDMA

Mia Colabrese2021-06-03T12:49:12-04:00June 3rd, 2021|

Recommendations to resolving DOCSIS 3.1 cable modems crashing with OFDMA Place OFDMA channels above 42 MHz: For those fortunate with 5-65 MHz or 5-85 MHz return paths, keeping four 6.4 MHz SC-QAM signals below 42 MHz and then loading one OFDMA channel above 42 MHz is ideal. Your SC-QAM channels should be fully optimized with dynamic profile modulation up to 64-QAM. Then, by placing your OFDMA channel above 42 MHz, you’re ensuring its likely to be in a low noise environment. A bonus is that subscribers with in-home amplifiers

3 06, 2021

Cable Modems Crashing with OFDMA

Mia Colabrese2021-06-07T14:51:59-04:00June 3rd, 2021|

Why are the DOCSIS 3.1 Cable Modems Crashing with OFDMA This too shall pass. Yes, we’ve seen this before: OFDMA + DBC = BSoD Yes, you have experienced it. Either as a subscriber or technician. The cable modem is on but there is no data flowing through it. Reboot the modem and it works again. It’s the equivalent of the Microsoft Windows blue screen of death (BSoD) and it’s back with a vengeance for cable operators running DOCSIS 3.1 OFDMA with a noisy upstream. What gives? I will

23 04, 2021

Dynamic Range Window OFDMA Troubleshooting

Mia Colabrese2021-08-15T11:48:19-04:00April 23rd, 2021|

Dynamic Range Window (DRW) and OFDMA Upstream Troubleshooting. Tips, suggestions and recommendations. Another power hour of cable with Brady Volpe and John Downey CMTS Technical Leader at Cisco. More and more operators are introducing OFDMA into their networks and experiencing a learning curve with its introduction and Dynamic Range Window issues. Find out ways to overcome these issues and ask any questions you may have. The discussion is on all things DOCSIS. Basic recap of Dynamic Range Window also see our previous OFDMA podcast or live stream. Dynamic

3 03, 2021

Easy Transmission Line Theory

Mia Colabrese2021-03-03T10:27:53-05:00March 3rd, 2021|

A Lesson on Transmission Line Theory Transmission line theory can be intimidating, because of the complex mathematics involved. But I’m not going there. Transmission line theory is further complicated by modeling, say, coaxial cable (a transmission line) as a distributed circuit model, comprising series inductance, shunt capacitance, series resistance, and shunt conductance. But I’m not going there, either. Instead, I’m going to provide an analogy using a bucket of water and hose. Understanding the basic principles of transmission line theory is key to understanding how RF signals transporting

23 02, 2021

OFDMA Troubleshooting

Mia Colabrese2021-08-15T16:10:19-04:00February 23rd, 2021|

OFDMA Upstream Troubleshooting. Tips, suggestions and recommendations. Another power hour of cable with Brady Volpe and John Downey CMTS Technical Leader at Cisco. More and more operators are introducing OFDMA into their networks and experiencing a learning curve with its introduction. Find out ways to overcome these issues and ask any questions you may have. The discussion is on all things DOCSIS. OFDMA "UPSTREAM" Troubleshooting: General intro OFMDA Upstream. The A means upstream 50% increase in upstream traffic Noise in return Cable Modems locking up CM locking up

6 01, 2021

OFDMA 204 MHz Upstream

Mia Colabrese2021-08-15T16:13:35-04:00January 6th, 2021|

Another power hour of cable with Brady Volpe and John Downey CMTS Technical Leader at Cisco, explore 204 MHz in OFDMA deeper with a brief overview of the differences between OFDMA and OFDM. Also with a discussion on LEO satellites Starlink by SpaceX and answer more questions from our listeners. The discussion is on all things DOCSIS. OFDMA 204 MHz Upstream: General intro Low Earth Satellites and the internet Supports gaming Back scatter More satellites than since the dawn of satellites Do subscribe and hit the thumbs

8 12, 2020

Virtualization a Deeper Dive Special Series Part Three

Mia Colabrese2021-08-15T16:14:33-04:00December 8th, 2020|

Follow part 3 of this series on cloud native virtualization of DOCSIS and broadband networks? Brady Volpe and Asaf Matatyaou, Vice President, Solutions and Product Management, Cable Edge Business at Harmonic, explore this topic as it is becoming a big focus in the way we deploy and manage our networks through cloud native virtualization. In this second installment we focus more on practical applications of virtualized CMTSs and answer more questions from our listeners. Part 1 of this series: https://youtu.be/IKbVYHYvrEc Part 2 of this series: https://youtu.be/eJVy573ASyM and

24 11, 2020

OFDM and OFDMA

Mia Colabrese2020-11-25T08:36:22-05:00November 24th, 2020|

OFDM and OFDMA The value added and what it means to my network By now you have heard or have been exposed to orthogonal frequency division multiplexing (OFDM). It was the innovative technology introduced in Data-Over-Cable Service Interface Specifications (DOCSIS) 3.1 to increase the efficiency by which DOCSIS networks can transmit data in the downstream. Additionally, many cable operators are now actively deploying orthogonal frequency division multiple access (OFDMA), which was also introduced in the DOCSIS 3.1 specification in order to increase upstream bandwidth efficiency. So just what