channel bonding Archives

28 07, 2014

DOCSIS Channel Bonding Episode 3

Mia Colabrese2021-08-17T09:36:58-04:00July 28th, 2014|

DOCSIS 3.0 Channel Bonding – Your Questions Answered Episode 3 Hosted by Brady Volpe of The Volpe Firm and Nimble This with Guest John Downey of Cisco. Brady and John will discuss the many advantages and disadvantages of DOCSIS 3.0 channel bonding. When everything is operating properly, we have great advantages for modem speed and operation at the expense of allocating more spectrum for more DOCSIS 3.0 channels. When things are not going well, we may not be aware or we may not have the expertise to troubleshoot the situation or even

30 06, 2014

DOCSIS 3.0 Channel Bonding – Episode 3

Mia Colabrese2021-08-17T10:54:31-04:00June 30th, 2014|

DOCSIS 3.0 Channel Bonding - Your Questions Answered Brady Volpe and John Downey will discuss the many advantages and disadvantages of DOCSIS 3.0 channel bonding. When everything is operating properly, we have great advantages for modem speed and operation at the expense of allocating more spectrum for more DOCSIS 3.0 channels. When things are not going well, we may not be aware or we may not have the expertise to troubleshoot the situation or even remedy the issues properly. DOCSIS 3.0 channel bonding - Upstream and Downstream bonding have

18 06, 2014

DOCSIS Channel Bonding – Your Questions Answered Friday June 20th

Mia Colabrese2021-08-17T10:58:02-04:00June 18th, 2014|

DOCSIS Channel Bonding - Your Questions Answered Presented by Brady Volpe of The Volpe Firm and Nimble This and with guest John Downey. DOCSIS Channel Bonding with a focus on Upstream (US), Downstream (DS), Partial mode, BW allocation, and SG sizing. About John - John has over 20 years in the data/telecommunications/networking industry with a 4 year BS in Electrical Engineering from Penn State University. He has been working for Cisco the last 13 years as a Broadband Network Engineer presently with the Cable and Access Business Unit (CABU).

1 03, 2012

Impact of Impulse Noise on Adaptive Pre-Equalization Part II

Mia Colabrese2021-08-18T09:36:31-04:00March 1st, 2012|

In part I of this article I discussed adaptive pre-equalization in DOCSIS cable modems and how it can compensate for many upstream impairments such as frequency response, group delay and micro-reflections. I also left off with a cliff-hanger, which is also the title of the article; impulse noise has an impact on adaptive pre-equalization, but how and what is it? I'll cover both what impulse noise is and why and how it impacts adaptive pre-equalization.

7 12, 2011

DOCSIS 3.0 Partial Service

Mia Colabrese2021-08-17T10:25:49-04:00December 7th, 2011|

Partial Service is a new term encountered in the DOCSIS 3.0 MULPI specification and realized in field deployments of DOCSIS 3.0 cable modems using upstream bonding. This was a topic that I touched on in this years SCTE Cable-Tec Expo, but will explore in greater detail in this article. Partial service can be considered a feature because the cable modem will stay online even when one or more upstream transmit channels goes offline.

28 09, 2011

BTR | Rollouts Continue as DOCSIS 3.0 Matures

Mia Colabrese2022-02-15T16:04:02-05:00September 28th, 2011|

The following article just released by Broadband Technology Report was written by Carl Weinschenk. A number of us from the industry contributed to Carl's piece, but it is a nice high-level summary article on the status of DOCSIS 3.0. Below you will find a snippet of the article with a link to the BTR website for the complete read. Enjoy. Rollouts Continue as DOCSIS 3.0 Matures There are just two areas of concern as the rollout of DOCSIS 3.0 continues: the upstream and the downstream. Observers seem satisfied

9 09, 2011

Why are my DOCSIS 3.0 cable modems transmitting at 52.2 dBmV?

Mia Colabrese2021-08-18T09:53:33-04:00September 9th, 2011|

A recent question from a reader provided an interesting response - the answer: maximum transmit power is 52.2 dBmV for DOCSIS 3.0 cable modems under certain conditions. The answer is very simple. They were transmitting at their maximum transmit level. That being in a 16-QAM modulation with four bonded upstream channels.

22 08, 2010

DOCSIS 3.0 Tutorial – Upstream Channel Bonding

Mia Colabrese2021-11-24T09:39:36-05:00August 22nd, 2010|

The focus of this article will be on the mechanics of upstream channel bonding and how it works more from a DOCSIS protocol perspective. Much more detailed information can be found in the DOCSIS 3.0 MULPIv3.0 document located in the Library, but this will provide a high level overview for the layman who is curious about the basics. First lets understand that it is the cable modem that is doing the channel bonding, remember in the upstream the cable modem transmits data to the CMTS. Per DOCSIS 3.0, the CM can bond from one to four channels in the upstream as coordinated by the CMTS. The CM is always under control by the CMTS.

18 07, 2010

DOCSIS 3.0 Tutorial – Downstream Channel Bonding

Mia Colabrese2021-08-17T16:09:16-04:00July 18th, 2010|

Downstream Channel Bonding is perhaps the ball bearings of DOCSIS 3.0, enabling subscriber data speeds in excess of 160 Mbps (4 times that of previous DOCSIS versions). While conceptually simple, the principle of combining multiple downstream DOCSIS channels together to carry the same user data must have tight constraints in order to preserve the integrity of the data and have the data arrive at the correct subscriber's device and in sequence. This article will cover both the physical layer aspects and DOCSIS protocol aspects that enable channel bonding.

1 07, 2010

DOCSIS 3.0 Tutorial – The EQAM

Mia Colabrese2021-08-17T15:58:05-04:00July 1st, 2010|

In my article on DOCSIS 3.0 M-CMTS architecture, I talked about the distributed nature of the CMTS with an M-CMTS core (the CPU of the system), a DOCSIS Timing Server, and an edge Quadrature Amplitude Modulator (EQAM). I am going to cover the EQAM in detail in this article because in the past couple of years, EQAM (also spelled eQAM) has rapidly become part of our vocabulary but its operation and value often go unappreciated. Further, in order to fully understand DOCSIS 3.0 operation, downstream channel bonding, and possible issue which may arise, a thorough understanding of the eQAM is critical.