Comments on: DOCSIS and Cable Modems – How it works :: Cable Modem Registration http://bradyvolpe.com/docsis-101/docsis101_modem-registration/ Wed, 21 Jul 2010 23:42:37 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Brady http://bradyvolpe.com/docsis-101/docsis101_modem-registration/comment-page-1/#comment-117 Brady Sun, 27 Jun 2010 12:11:25 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-117 Hi Tatak, If you move and take your cable modem with you, it is likely that you will be registering on a different CMTS. At the same time, depending upon your cable operator, you may or may not be registering with a different provisioning server. So there are a couple of things that come into play here that I will discuss. First, depending upon your cable operator, often times cable operators will put into place security measures to lock the MAC address of your cable modem to a specific CMTS. This prevents hackers from spoofing your MAC address and BPI certificate somewhere else in the cable network. So if you suddenly show up on a different CMTS it is possible that you will be rejected. Second, if your cable operator has multiple provisioning servers, you may need to be added to the provisioning server in the new area that you are moving (I don't know if your moving a very short distance or across many states). If you are not provisioned on the provisioning server, there is no way that the provisioning server will recognized your cable modem's MAC address as valid and allow it on the network. So in summary, if you are moving, it is always a good idea to let your cable operator know about the move and your new address so that they can make certain they have you provisioned in their back office system -Brady Hi Tatak,

If you move and take your cable modem with you, it is likely that you will be registering on a different CMTS. At the same time, depending upon your cable operator, you may or may not be registering with a different provisioning server. So there are a couple of things that come into play here that I will discuss.
First, depending upon your cable operator, often times cable operators will put into place security measures to lock the MAC address of your cable modem to a specific CMTS. This prevents hackers from spoofing your MAC address and BPI certificate somewhere else in the cable network. So if you suddenly show up on a different CMTS it is possible that you will be rejected.
Second, if your cable operator has multiple provisioning servers, you may need to be added to the provisioning server in the new area that you are moving (I don’t know if your moving a very short distance or across many states). If you are not provisioned on the provisioning server, there is no way that the provisioning server will recognized your cable modem’s MAC address as valid and allow it on the network.
So in summary, if you are moving, it is always a good idea to let your cable operator know about the move and your new address so that they can make certain they have you provisioned in their back office system

-Brady

]]> By: tatak http://bradyvolpe.com/docsis-101/docsis101_modem-registration/comment-page-1/#comment-52 tatak Thu, 17 Jun 2010 15:25:51 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-52 very good post, help me alot if i move to another home/far away (still same tv cable operator), does my cable modem need more longer time to lock again than before? sory for my english thanks, tatak very good post, help me alot
if i move to another home/far away (still same tv cable operator), does my cable modem need more longer time to lock again than before?

sory for my english

thanks,

tatak

]]> By: Brady http://bradyvolpe.com/docsis-101/docsis101_modem-registration/comment-page-1/#comment-51 Brady Wed, 26 May 2010 01:44:48 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-51 Murthy, Everyone starts somewhere. Every cable modem receives the same downstream frequency. Data sent to the cable modems flows in one continuous MPEG-2 Transport Stream (TS). Buried in this stream of data are Service Identifiers (SIDs) for each cable modem so that when data is transmitted to a modem, the SID acts as a tag to tell the modem when data is meant for that specific modem. This basically means that you can have hundreds of modems or more listening to one downstream 6 or 8 MHz QAM channel. The data takes care of the rest. Regards, -Brady Murthy,

Everyone starts somewhere. Every cable modem receives the same downstream frequency. Data sent to the cable modems flows in one continuous MPEG-2 Transport Stream (TS). Buried in this stream of data are Service Identifiers (SIDs) for each cable modem so that when data is transmitted to a modem, the SID acts as a tag to tell the modem when data is meant for that specific modem. This basically means that you can have hundreds of modems or more listening to one downstream 6 or 8 MHz QAM channel. The data takes care of the rest.

Regards,
-Brady

]]> By: Murthy Devarakonda http://bradyvolpe.com/docsis-101/docsis101_modem-registration/comment-page-1/#comment-50 Murthy Devarakonda Mon, 24 May 2010 21:06:13 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-50 Nice post. I have a novice question. Does every cable modem gets a different down stream frequency? Thank you. Murthy Nice post. I have a novice question. Does every cable modem gets a different down stream frequency?

Thank you.
Murthy

]]> By: Brady http://bradyvolpe.com/docsis-101/docsis101_modem-registration/comment-page-1/#comment-49 Brady Fri, 26 Feb 2010 12:56:40 +0000 http://bradyvolpe.wordpress.com/?p=143#comment-49 Hi Vendy, On the BPI, I have been asked to not provide a "How to hack cable modem's BPI+ security in layman's terms", so I will not be doing a special on BPI. Sorry for that. But to answer your question on High Pass filters, they are installed to protect TV's from cable Modems. This is especially true with newer cable modems (DOCSIS 3.0) or Euro-DOCSIS modems. D3.0 modems transmit up to 80 MHz and Euro-DOCSIS modems transmit up to 60 MHz. in either case, many TVs receive down to 50 MHz. So in theory the cable modem could transmit at very high levels into the frequency range that the TV set could be receiving. This would cause distortion and possible over-load on your TV set. Regards, -Brady Hi Vendy,

On the BPI, I have been asked to not provide a “How to hack cable modem’s BPI+ security in layman’s terms”, so I will not be doing a special on BPI. Sorry for that.

But to answer your question on High Pass filters, they are installed to protect TV’s from cable Modems. This is especially true with newer cable modems (DOCSIS 3.0) or Euro-DOCSIS modems. D3.0 modems transmit up to 80 MHz and Euro-DOCSIS modems transmit up to 60 MHz. in either case, many TVs receive down to 50 MHz. So in theory the cable modem could transmit at very high levels into the frequency range that the TV set could be receiving. This would cause distortion and possible over-load on your TV set.

Regards,
-Brady

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