Mia Colabrese, Author at Volpe Firm

21 09, 2011

Cable Modems init(r1) init(r2) Why are they stuck?

Mia Colabrese2021-08-20T09:21:27-04:00September 21st, 2011|

Cable Modems init(r1) init(r2), DOCSIS Cable Modems going offline? DOCSIS Cable Modems init(r1) init(r2) are stuck or offline! Many of us have been there before - one or more DOCSIS cable modems init(r1) init(r2) stuck in one of numerous "init()" conditions - how do we interpret these messages and what do we do? A recent reader wrote in and had just this problem. DOCSIS cable modems going offline and getting stuck in "R1" or "R2" condition, or Cable Modems init(r1) init(r2), because these are the status conditions displayed on the DOCSIS CMTS

15 09, 2011

Which is Best CMTS or EOC – Ethernet over Coax?

Mia Colabrese2011-09-15T18:24:40-04:00September 15th, 2011|

Interesting post from fellow DOCSIS technologist on CMTS vs. EOC (Ethernet over Coax). Check out the post and his blog.

11 09, 2011

DOCSIS 3.0 Speaking Engagements

Mia Colabrese2011-09-11T18:04:11-04:00September 11th, 2011|

See me present at IBBS's symposium during September 13-14, 2011 or Cable-Tec Expo during November 15-17, 2011 on DOCSIS 3.0 test equipment and troubleshooting.

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.

5 09, 2011

Top 10 DOCSIS 3.0 Terms You Need to Know

Mia Colabrese2021-08-17T13:31:08-04:00September 5th, 2011|

This is the speak you need to know when talking DOCSIS 3.0 to any DOCSIS Engineer or specialist. It is important that you learn the full name, in many cases the acronym and also what value the particular terminology plays in a DOCSIS 3.0 network as it will likely be crucial in troubleshooting tough-to-diagnose DOCSIS impairments.

14 08, 2011

Moving to the Cloud | Google Chromebook

Mia Colabrese2011-08-14T22:34:57-04:00August 14th, 2011|

Here is a list of five applications that I have found to be extremely useful for cloud-based computing. There are many I have still not tried, but this will give you some idea of what is out there. Chromebooks are definitely worth considering as a low cost laptop.

31 07, 2011

IPv6 and PC Provisioning in a DOCSIS Network

Mia Colabrese2021-08-18T10:01:08-04:00July 31st, 2011|

With IPv6 on the way in a number of MSO (Multi-System Operator) networks, I have received numerous questions lately about how home devices such as routers and PCs attached to DOCSIS cable modems will get their IP addresses. Will cable operators suddenly start issuing IPv6 IP addresses to their customers? Will you as a subscriber need to upgrade your equipment to support IPv6? Or does the cable modem act as a Network Address Translation (NAT) device and hand-out IP address to each device attached to it? These are some very good questions and the answers are addressed in the DOCSIS specification as I will outline.

24 06, 2011

DOCSIS T1, T2, T3, and T4 Timeout Descriptions

Mia Colabrese2022-06-20T20:55:33-04:00June 24th, 2011|

This is a handy summary of the various timeout errors you will find in a DOCSIS network. T3 and T4 timeouts are described in much more detail elswhere in this blog, however this post provides a high level overview of the various timeouts as a reference.

20 04, 2011

Undocumented Cisco CMTS Commands

Mia Colabrese2021-11-24T09:24:55-05:00April 20th, 2011|

Every now and then you find a very useful URL. If you are a Cisco CMTS user then you find some of the undocumented commands on this site usefull:

20 02, 2011

Fringe – President’s Day Topics

Mia Colabrese2020-07-02T15:20:04-04:00February 20th, 2011|

In case you have some free time on President's Day, here are of couple of things for you to take a look at. On the DOCSIS side, once you have had your dose of tutorials here, head over to the DOCSIS Help Forums at http://www.docsishelp.com/forums . Learn about Alice. While many of you are here to learn about DOCSIS, you may want to take an opportunity to find out the latest in educational software training out of Carnegie Mellon University (CMU). If you got excited about Alice, you may want to take the time to learn about one of the key creators of Alice, Randy Pausch.

About Mia Colabrese