Digital modem fast retrain escape mechanism
US6252901A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Apr 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/062
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and system for escaping from a fast retrain sequence in an ADSL system, particularly in a splitterless ADSL system. In one aspect of the invention, in order to minimize the impact of needing to complete nearly all of a fast retrain sequence, particularly when the sequence is unnecessary, the invention allows a responding transceiver unit to reply to a fast retrain request from an initiating transceiver unit with an "initialization" response. This response, not part of any standard ADSL fast retrain protocol, aborts a fast retrain sequence, and permits initialization to commence without the delay caused by waiting for completion of the fast retrain sequence. In another aspect of the invention, a fast retrain sequence is allowed to proceed up to a certain point, and then truncated by sending a command between a responding transceiver unit and an initiating transceiver unit. In particular, whenever initialization and power cut-back are both required (a typical case in ADSL systems), a fast retrain sequence is initiated, acknowledged, and executed until the end of the power cut-back section of the conventional fast retrain sequence, at which time a digital message is exchanged…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.