troubleshooting Archives

21 08, 2013

DOCSIS PNM – Something Really Interesting!

Mia Colabrese2021-08-18T09:15:32-04:00August 21st, 2013|

DOCSIS PNM - Get Excited! Awhile back I wrote an article about DOCSIS Proactive Network Maintenance (PNM). Not only did I find this technology fascinating I decided to really get involved with PNM. I will also be speaking at SCTE EXPO on the topic of PNM this year. Topic: DOCSIS Pre-Equalization: Vastly Powerful, Often Undervalued For those of you who have not heard of PNM, here are the highlights. DOCSIS Proactive Network Maintenance (PNM) developed by InGeNeOs™ under Cablelabs®. It is one of the coolest technologies I've been involved

30 05, 2013

Brady Volpe Presenting at ANGACOM June 4th – June 6th

Mia Colabrese2013-05-30T10:16:19-04:00May 30th, 2013|

Come See Brady Volpe present at ANGACOM 2013 Topics: You can also see Brady present on - DOCSIS & Testing Best Practice in an All Digital Plant - Tuesday, June 4, 2013, 12.00 to 1.15 p.m. Pre-equalization analysis (PNM) and the benefits this analysis has for cable operators is the topic Brady Volpe will present on at ANGACOM.de in Cologne Germany next week at the - ANGACOM International Breakfast by SCTE , June 5th, 2013. It will include the activity surrounding the CableLabs initiative on PNM. Additionally Brady Volpe will be in Halle 10.2 (upstairs)

28 05, 2013

Pre-equalization analysis PNM presentation at ANGACOM

Mia Colabrese2013-05-28T16:44:58-04:00May 28th, 2013|

Pre-equalization analysis (PNM) and the benefits this analysis has for cable operators is the topic Brady Volpe will present on at ANGACOM.de in Cologne Germany next week at the - ANGACOM International Breakfast by SCTE , June 5th, 2013. It will include the activity surrounding the CableLabs initiative on PNM. You can also see Brady present on - DOCSIS & Testing Best Practice in an All Digital Plant - Tuesday, June 4, 2013, 12.00 to 1.15 p.m. Additionally Brady Volpe will be in Halle 10.2 (upstairs) K19

17 09, 2012

DOCSIS Codeword Errors | What you should know

Mia Colabrese2024-04-19T10:18:35-04:00September 17th, 2012|

Calculating... Calculating... DOCSIS Codeword Errors - You will likely see them DOCSIS correctable codeword errors and uncorrectable codeword errors are available as a metric in most cable operator monitoring tools and Operations Support Systems (OSS). The monitoring tools and OSS generally provide data and dashboards for users to monitor overall network health and then identify a problem when it occurs. Metrics like codeword errors are extracted directly from DOCSIS CMTSs using Simple Network Management Protocol (SNMP) or Internet Protocol Detail Records (IPDR), the later being preferred due to

5 07, 2012

Subscribers get lower data rates than provisioned?

Mia Colabrese2020-06-09T09:36:58-04:00July 5th, 2012|

Why do my DOCSIS subscribers and their Cable Modems get lower speeds than what my DOCSIS config file says they should get? This is a common question that I am asked and it has more than one answer. All too often the RF plant is the first to blame for low DOCSIS cable modem speeds, but in many cases the root cause of the problem can be traced back to the cable modem configuration file and/or the lack of appropriate speed test applications in the headend. Also, some

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.

29 02, 2012

Impact of Impulse Noise on Adaptive Pre-Equalization

Mia Colabrese2021-11-24T09:26:04-05:00February 29th, 2012|

For those of you who have attended my seminars you are familiar with adaptive pre-equalization in cable modems (if not I'll explain it in detail momentarily). Also, if you have done any amount of RF plant troubleshooting you are certainly familiar with Impulse noise (again, I'll cover this too). But if you are like me, I never knew that the two topics were co-related.

15 02, 2012

SCTE Music City Chapter DOCSIS 3.0 Training

Mia Colabrese2012-02-15T12:42:01-05:00February 15th, 2012|

If you have missed our previous DOCSIS 3.0 seminars in the Southeast, make sure to catch this one next week in Nashville! John Downey of Cisco and I will be covering the critical DOCSIS 3.0 bonded downstream and upstream implementation and troubleshooting need-to-know issues.

26 01, 2012

Advanced Troubleshooting in a DOCSIS 3.0 Plant

Mia Colabrese2020-07-02T17:55:04-04:00January 26th, 2012|

If you missed the SCTE Cable-Tec 2011, I am making available my presentation and white paper on Advanced Troubleshooting in a DOCSIS 3.0 Plant. Each speaker had only 20 minutes to cover topics that could easily last hours, so the presentations are understandably brief. Below you will find my presentation in "Slideshare" for online viewing as well as a fully downloadable PowerPoint version. The PowerPoint version also has reader notes attached at the bottom of each slide which you may find useful. In addition, the animations work a little better in the downloadable version.

21 12, 2011

DOCSIS 3.0 Impaired Service

Mia Colabrese2021-08-17T16:00:00-04:00December 21st, 2011|

"Impaired Service" in which case one or more bonded upstream channels are impacted by upstream RF impairments while other bonded channels are not. Since subscriber data is striped (that is broken into pieces and spread across each upstream channel and then re-assembled by the CMTS), some of the data will be lost or have errors while other data will not. Subscribers will most likely notice an impaired condition as upstream data rates slow down due to TCP/IP transmissions and/or VoIP, gaming, teleconferencing and other real-time applications will be noticeably impacted.