The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 2006
Filed:
Jan. 18, 2000
Joanna Qun Zang, San Jose, CA (US);
Feisal Daruwalla, Santa Clara, CA (US);
James R. Forster, Los Altos, CA (US);
Guenter E. Roeck, San Jose, CA (US);
Joseph O'donnell, Fremont, CA (US);
John Chen, Fremont, CA (US);
Mark Millet, Mountain View, CA (US);
Joanna Qun Zang, San Jose, CA (US);
Feisal Daruwalla, Santa Clara, CA (US);
James R. Forster, Los Altos, CA (US);
Guenter E. Roeck, San Jose, CA (US);
Joseph O'Donnell, Fremont, CA (US);
John Chen, Fremont, CA (US);
Mark Millet, Mountain View, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A CMTS redundancy technique requires at least two CMTS interfaces (e.g., line cards) on one or more CMTS chassis at the head end of a cable network. One of the CMTSs serves as a backup or 'protecting' CMTS. When another CMTS (a 'working' CMTS) becomes unavailable to service its group of cable modems, the protecting CMTS takes over service to those cable modems. The SWITCHOVER takes place transparently (or nearly transparently) to the cable modems. The protecting CMTS provides service on the same downstream channel as used by the working CMTS. The cable modems need not modify any settings pursuant to their cable modem communication protocol (e.g., DOCSIS ranging). This transparency to the cable modems is realized by keeping the working and protecting CMTSs in synchronization regarding service parameters for the cable modems. In other words, the protecting CMTS maintains a list of current parameters for allowing service to the cable modems.