Browse Prior Art Database

Asynchronous Carrier Adapter

IP.com Disclosure Number: IPCOM000059642D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Ku, EH: AUTHOR [+2]

Abstract

This article describes an asynchronous (async) carrier adapter utilizing a modem attachment card. The universal asynchronous receiver and transmitter (UART) chip is commonly used with the EIA driver in communications to transfer computer data between devices through modems and phone lines. With this system configuration, external modems are required for converting the computer data to phone line signal, and vice versa. To integrate the external modem into an integrated modem adapter for systems can be cost-effective as well as space saving (save on power supply, unneeded parts and elaborate box for the external modem). However, due to differences in input/output (I/O) architecture or structure among systems, often it resulted that the integrated modem adapter of one system cannot be used on another system.

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Asynchronous Carrier Adapter

This article describes an asynchronous (async) carrier adapter utilizing a modem attachment card. The universal asynchronous receiver and transmitter (UART) chip is commonly used with the EIA driver in communications to transfer computer data between devices through modems and phone lines. With this system configuration, external modems are required for converting the computer data to phone line signal, and vice versa. To integrate the external modem into an integrated modem adapter for systems can be cost-effective as well as space saving (save on power supply, unneeded parts and elaborate box for the external modem). However, due to differences in input/output (I/O) architecture or structure among systems, often it resulted that the integrated modem adapter of one system cannot be used on another system. The integrated modem adapter has to be redesigned and recertified for each of the different systems. The adapter arrangement disclosed herein makes unnecessary modem re-design and some of the lengthy re-certification process as well as to provide a path to the user for the cost-effective device upgrade and future expansion. In the present adapter shown within the broken line in the side view in Fig. 1, the async carrier adapter card is designed with a modem attachment card. The functions are divided into two groups. All system-related unique functions such as I/O decodes, system interface requirements (interrupt handling circuit, data bus structure, etc.) and the UART functions are combined on the async carrier adapter card. The feature-related functions common to all systems such as modem functions, phone line interface, dialing circuits, local controller, etc., for the modem are on the attachment card to the async carrier adapter card. Th...