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Method and apparatus for transmission of analog and digital

a technology of analog and digital transmission, applied in the direction of digital transmission, wireless communication, wireless communication, etc., can solve the problems of no capacity to work with all four, and no bridge throughput of 80%

Inactive Publication Date: 2008-01-01
MORRIS WALKER C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]In order to eliminate standard or fax data errors that may occur during signal quality deterioration, interference, noise, hand-off, and loss of carrier using dirty or poor quality conventional telephone line service, radio frequency networks, satellite systems and cellular telephone systems, the ITC-RM was developed. The ITC Reliable Mode (ITC-RM) enhances and fine tunes Microcom Networking Protocol (MNP) levels 2, 3, 4 and 5. ITC-RM is programmed in the modem BIOS in an erasable programmable read only memory (EPROM) 16 for modem-controller 120.
[0021]Among the unique advantages offered by the present invention installed in remote computer or DTE is the ITC-Reliable Mode. The ITC-RM enhances and fine tunes MNP for users who require fast, reliable and error-free standard data or fax data transmission over particularly poor lines, such as conventional rural telephone lines, radio frequency networks, satellite systems and cellular telephone systems. The present invention installed in a host computer or DTE is able to distinguish and auto switch from cellular incoming calls, radio frequency calls, satellite incoming calls or incoming conventional telephone line type of modem calls. The present invention installed in a remote computer or DTE communicating to the present invention installed in another remote or host computer or DTE via telephone line service, cellular telephone systems, satellite systems or radio frequency networks is able to transmit and receive standard data and fax data at a rate up to and exceeding 9600 bps.
[0029]The invention allows any computer or DTE to be an isolated communication device; when using a speakerphone and dialing telephone numbers, through the use of communication software, using a computer's or DTE's numeric keypad or numeric keys and can automatically dial or answer through communication software script files.

Problems solved by technology

The conventional telephone line type modem is not reliable over cellular telephone systems, radio frequency networks or satellite systems.
There are other error-correcting modems able to send and receive standard data over cellular telephone systems, and other modems able to send and receive standard data over radio frequency networks, and other modems able to send and receive standard data over satellite systems, but none have the capabilities to work with all four; telephone line service, radio frequency networks, satellite systems and cellular telephone systems.
It is rated at 1200 bps, but with the overhead of it's proprietary error correcting scheme, the throughput of the Bridge is no more than 80%.
The Span modem, if it is manually switched to non-cellular mode, will work with a conventional telephone line type of modem via telephone line; but the Span modem, connected to a computer and a telephone line, is unable to distinguish or auto switch from a cellular incoming Bridge call or an incoming conventional telephone line type of modem call.
This makes the Span modem unsuitable as a host type of modem where you have incoming cellular and conventional telephone line type modem calls.
The Bridge or Span modems do not support voice or fax communication over wireless radio frequency telemetry modules, packet radios, satellite systems or telephone line communications.
Compared to asynchronous communication, synchronous communication is faster, but is also requires more complex controlling software as well as hardware for it to properly transmit and receive standard data.
Because there is no common synchronizing clock between asynchronous systems, they are limited to slower speeds.
Signal quality deterioration, interference or noise, hand-off, and loss of carrier are some of the primary problems in the transfer of standard or fax data over rural telephone lines, cellular telephone systems, satellite systems and radio frequency networks.

Method used

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  • Method and apparatus for transmission of analog and digital
  • Method and apparatus for transmission of analog and digital
  • Method and apparatus for transmission of analog and digital

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Embodiment Construction

[0035]Referring to the drawing and to FIG. 1 in particular, shown therein and generally designated by the reference character 120, is a preferred embodiment of a modem-controller according to the present invention. Microcontroller 10 is a microprocessor which is employed as the controller for modem-controller 120. One static read-only memory (RAM) 14 is added to the system to provide adequate working space for programming. An erasable programmable read only memory (EPROM) 16 is added to the system to provide enough ROM space for the firmware. RAM 14 and EPROM 16 are operatively connected to microcontroller 10 by data and address bus 12. Microcontroller 10 executes the firmware or modem BIOS stored in EPROM 16 and manipulates the data in RAM 14 through the data and address bus 12. A decoder in microcontroller 10 is used to decode the address bus to select RAM 14, EPROM 16 or data pump 18. Modem-controller 120 communicates with the DTE 2 through the RS232C interface 6 operatively conn...

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PUM

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Abstract

A digital communications path-controller for auto switching and controlling the transmission and receiving of analog and error-free transmission of standard digital signals, fax digital signals and analog communications over telephone line service, radio frequency networks, satellite systems, as well as wireless telephone systems includes switches that receive control signals from the micro-controller for controlling and switching the analog or digital path of an internal analog board and the signals from a digital communications path to and from a radio frequency transceiver via a radio frequency transceiver interface / logic board, a wireless telephone transceiver via a wireless telephone transceiver interface, a telephone landline via a telephone line interface, a satellite system via a telephone landline through the telephone line interface. A method selects the telephone line interface which either connects to the telephone line, the satellite system or the wireless telephone, and another method bypasses the telephone line interface, selects and controls radio frequency telemetry modules or packet radios. The operation of the digital communications path-controller is divided into three modes comprising a command mode, a digital mode and an escape mode. The software is a set of digital communication protocols which provide error-free communication of digital and define a file transfer protocol at the application layer, the session protocol and the link protocol.

Description

[0001]This is a request for filing a divisional application under 37 C.F.R. § 1.60, of prior application Ser. No. 08 / 711,515 filed on Sep. 10, 1996 now U.S. Pat. No. 5,802,483, of Walker C. Morris, for METHOD AND APPARATUS FOR TRANSMISSION OF VOICE AND DATA, which was divisional application of utility application Ser. No. 08 / 314,533 filed Sep. 28, 1994 now U.S. Pat. No. 5,793,843, which was a File Wrapper Continuation of utility application Ser. No. 07 / 828,527 filed on Jan. 28, 1992, now abandoned, which was a Continuation-in-Part of utility application Ser. No. 07 / 733,826 filed Jul. 22, 1991, now abandoned, which was a Continuation-in-Part of utility application Ser. No. 07 / 429,356 filed Oct. 31, 1989, now abandoned.[0002]More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,230,010. The reissue applications are application Ser. No. 10 / 368,320, filed Apr. 28, 2003 (the present application) and application Ser. No. 11 / 430,301, filed May 8, 2006.<?ins...

Claims

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Application Information

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IPC IPC(8): H04Q7/20H04B7/185H04B7/26H04L29/06H04L29/08H04M11/06H04W88/02
CPCH04B7/18567H04M11/06H04W88/02H04L69/18H04L69/324H04L9/40
Inventor MORRIS, WALKER C.
Owner MORRIS WALKER C
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