MDSL host interface requirement specification
US5910970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Jun 8, 1999 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03611
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A modem that operates selectively in the voice-band frequency band and higher frequency bands is provided. This modem supports multiple line codes, like DMT and CAP. The modem uses a Digital Signal Processor (DSP), so that different existing ADSL line codes, such as Discrete MultiTone (DMT) and Carrierless AM/PM (CAP), can be implemented on the same hardware platform. The modem employs a method for interfacing the modem hardware with a host operating system. The method calls a defined set of host interface functions for command/control, calls a defined set of host interface functions for link correction management, calls a defined set of host interface functions for data sending/receiving, calls a defined set of host interface functions for synchronization between voice-band audio and above voice-band audio, and calls a defined set of host interface functions to use the voice-band as control channel and above voice-band as a data channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.