Modem implemented in software for operation on a general purpose computer having operating system with different execution priority levels
US5925114A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A software implementation of a modem, particularly designed to execute on a general purpose host processor, controlled by a non-real-time, multi-tasking operating system (OS), such as the Windows 95 OS. The software modem is scaleable and portable. In this fashion, communication protocols (particularly datapumps) may be easily added to, or removed from, the system, and the modem may be easily adapted for use on other types of processors and operating systems. The controller and datapump portions execute as a plurality of interacting subsystems, each of which can execute at at least one of several priority levels. A HRT level routine is responsible for handling an ASIC that buffers transmit and receive samples destined to and received from the phone lines. A SRT level task includes logic that needs time functionality, but which is not time-critical like the HRT logic. BRT routines execute in an event-driven basis and are used for many controller functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.