Method and apparatus for enhancing periodic ranging for cable modems
US6742186B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1999 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Jun 2, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0682
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed is a cable modem termination system (CMTS) capable of outputting periodic ranging opportunities. The CMTS includes an upstream receiver and demodulator capable of receiving an upstream signal, a downstream transmitter and modulator capable of transmitting a downstream signal, and a processor. The processor is arranged to output a first periodic ranging opportunity after a first polling interval from the downstream transmitter and modulator and to output a second periodic ranging opportunity after a second polling interval if the upstream receiver has not received a periodic ranging request in response to the first periodic ranging opportunity, wherein the second polling interval is shorter than the first polling interval. In one implementation, the first polling interval plus the second polling interval are less than a disconnect interval after which a cable modem that is communicating with the upstream receiver disconnects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.