MDSL host interface requirement specification

• US 5,910,970 A
• Filed: 10/31/1996
• Issued: 06/08/1999
• Est. Priority Date: 05/09/1996
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Lu, Xiaolin
• Primary Examiner(s): Ghebretinsae, Temesghen
• Application Number:
  US08/739,398
• Time in Patent Office: 950 Days
• Field of Search: 375/222, 375/377, 395/200.57, 395/200.58, 395/200.6, 395/200.67, 395/200.62, 395/856, 395/885, 395/309, 395/200.3, 379/93.01, 379/93.05, 379/93.28
• US Class Current: 375/377
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03611 Iterative algorithms
• CPC Class Codes: H04L 25/03 Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/4921 using quadrature encoding, e.g. carrierless amplitude-phase coding
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

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.

Claims

1. A method for interfacing modem hardware with a host operating system comprising the steps of:

a) calling a defined set of host interface functions for command/control

b) calling a defined set of host interface functions for link connection management

c) calling a defined set of host interface functions for data sending/receiving, and

d) calling a defined set of host interface functions for synchronization between voice-band audio and above voice-band video, and

e) calling a defined set of host interface functions to use the voice-band as control channel and above voice-band for the data channel.