This can be done by having the operator add another signature to the code file. Sometimes, an operator wants to have more control over which software versions are installed on its network as mentioned, the new software versions might not be certified. Adding a manufacturer's signature to a code file assures that a trusted manufacturer has signed the new software. Using that root certificate, the modem verifies the CVC included with the imagethen verifies the signature on the image and only after those checks pass upgrades its software. The root certificate is pre-installed in each modem. This CVC is signed by the same root certificate as is used to create the cable modem certificates. The private key used to create this signature is linked with a special certificate, the Code Verification Certificate CVC. This does not guarantee that the new software will work correctly that software might not be certifiedbut it can guarantee that a trusted manufacturer and not some hacker created the software. This ability is and has been an attractive target to tamper with a cable modem's software. The need for bug fixes and new features necessitate the ability to remotely install new software onto already deployed modems. Ideally, that certified software is installed at production time and is never changed. If a cable modem has been tested against these specifications certifiedyou can be sure it will behave correctly and securely. Hi Jan, I can help you out with that.Jump to navigation.
Modem files and TLV Log in or register to post comments. Unfortunately I did not realise that once one adds the "Docsis Extension Field" there are actually new parameters one can choose from, like the Service Identifier or Attribute masks and so on. May I ask what editor you are using? I finally figured out the syntax for the exentis editor by writing the file by hand, converting it using the linux docsis command and importing it into excentis. Hi Sarcarean, What I really needed was the syntax for the Excentis editor but thanks for your tip. Contact me via email at: contact embeddedcomputers. I am trying to add the service type identifier TLV I do know how to create basic docsis provisioning files and I have spent a couple of hours trying to figure this one out but unfortunately unsuccessfully.Īny pointers would be greatly appreciated. Hello, I was wondering if somebody could help me out. Transition metals: some cobalt chemistry.
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