Many of us have been there before – one or more cable modems 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, also known
Interesting post from fellow DOCSIS technologist on CMTS vs. EOC (Ethernet over Coax). Check out the post and his blog.
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:
After some requests, I’ve updated the library with a few examples of DOCSIS config files and a CMTS running config. You’ll need a DOCSIS config editor to view the config files, but the running configs for the CMTS are in text. Also, check out the ANSI document on Digital Transmission I posted. It is a
This is the first of a new series of Tutorials focused on the Data Over Cable Service Interface Specifications (DOCSIS) version 3.0. I will make the assumption that you are familiar with the DOCSIS 1.x / 2.0 standards or have already reviewed my DOCSIS Basics Tutorial as I will be using many terms without explanation since they were previously covered.
The DOCSIS 3.0 specification is an extension of the DOCSIS 1.x and 2.0 specification which dramatically increases the data throughput by adding a technology known as channel bonding to the DOCSIS downstream and upstream, adding increased security, adding support for IPv6, and substantially improving the back-office management support (MIBs, SNMP, IPDR, etc.) for DOCSIS. Each of these topics will covered in much greater detail in this DOCSIS 3.0 tutorial in multiple posts yet to come.
This article will focus more specifically on DOCSIS 3.0 issues that will occur as you are deploying DOCSIS 3.0 or post -deployment.
The first part of this article (in CT’s March 2009 issue) discussed downstream potential issues, while this one focuses on the potential issues associated with upstream deployments. In particular, this article covers the critical upstream areas that one should be aware of when getting ready to deploy or already deploying DOCSIS 3.0.
If you have not had a chance to catch the June issue of Communications Magazine, check out the article penned by John Downey, of Cisco Systems, and I on “the critical upstream areas that one should be aware of when getting ready to deploy or already deploying DOCSIS 3.0.”
The shortened version of this article can be found on CT’s website HERE. The full version should be made available on this blog soon.
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