MXPA96005498A

MXPA96005498A - Method and system to interoperate between integrated services digital network transportation and a public switched telephony network, to allow simultaneous transmission of voice and data on a telephone line

Info

Publication number: MXPA96005498A
Application number: MXPA/A/1996/005498A
Authority: MX
Inventors: Ruhi Dagdeviren Nuri; Prestinario Jerome; R Klein Kenneth; Pratap Mahendra
Original assignee: At&T Corp
Priority date: 1995-11-13
Filing date: 1996-11-11
Publication date: 1997-08-01

Abstract

The present invention relates to a telephone system that simultaneously transmits voice and data over a public switched telephone network and over a telephone line between a calling party location having an ISDN connection and a destination party location that has an analog POTS connection. The calling party location determines whether the calling party location has an analog POTS connection, and then creates a connection between the calling party and the destination party. The voice and data band signals are formed into packets and multiplied and transmitted through the public switched telephone network to a modem located at a destination part location. The packets are demultiplied into separate digital signal and voiceband components and the digital signal components are demodulated within the modem. The demodulated data signals are sent to a data terminal and the voice band signals are sent to an analog terminal.

Description

METHOD AND SYSTEM TO INTEROPERATE BETWEEN INTEGRATED SERVICES DIGITAL NETWORK TRANSPORTATION AND A PUBLIC SWITCHED TELEPHONE NETWORK, TO ALLOW SIMULTANEOUS TRANSMISSION OF VOICE AND DATA ON A TELEPHONE LINE FIELD OF THE INVENTION This invention relates to a method and system for simultaneously transmitting voice and data through a public switched telephone network and on a telephone line between a calling party location having an ISDN connection and a location of destination part that has an analog POTS connection. BACKGROUND PB T-A INVENTION Many businesses and individuals use telephone lines that comply with the standards of the Integrated Services Digital Network (ISDN) to connect to the public switched telephone network. The ISDN lines allow fast data transfer such as 64 bytes per second. Those businesses that use ISDN can communicate with other businesses that have ISDN connections with simultaneous voice and data connections. Between the two existing ISDN connections, it is possible to digitize voice, optionally compress voice and data and even finalize voice and data. Schemas for communication between two ISDN connections include error correction schemes and control commands and frame information. Many other features and configurations are possible for those with skill in the REF: 23282 technique, when two businesses that use ISDN connections communicate with each other. Some businesses and individuals however have not adapted ISDN as quickly as some proponents desired. In this way, these individuals and businesses are still connected to the public switched telephone network through an Old Simple Telephone Service (POTS = Plain Old Telephone Service) or analog connection, also called a Ring-Tip (T / R) connection. . As a result, if another business with an ISDN connection using a standard protocol attempts simultaneous voice and data communication from the ISDN connection, through the network to the POTS line, communication will fail. Currently there are existing schemes and protocols that allow simultaneous voice and data communication between two analogue lines (POTS) using odems. However, there is no existing scheme for simultaneous voice and data communication between an ISDN connection and a standard POTS connection. COMPENDIUM OF THE INVENTION The advantages and features of the present invention now allow simultaneous transmission through a public switched telephone network and over a telephone line between a calling party location, which has an ISDN connection and a part location. destination that has an analog POTS connection.

In accordance with the present invention, the calling party location includes an appropriate software platform, to determine if the calling party location has an analog POTS connection. When the software platform determines that there is an analog POTS terminal at the destination, a connection is created between the calling party location and the destination part location. Data and voice band signals are formed into packets and then multiplied at the location of the calling party. The advanced data and voiceband packets are transmitted through the public switched telephone network to a specialized modem located at a destination part location. The packets are demultiplied into separate digital signal and voiceband components and demodulated within the modem. The demodulated data signals are sent to a data terminal and the voiceband signals are sent to an analog terminal such as a standard telephone. The present invention now allows an ISDN subscriber to communicate with a destination party connected by a POTS, and allows at the destination, the simultaneous use of a computer while the standard POTS telephone is also used. Data signals can be modulated within the modem at the destination part location. Data on any voice band signals can be packaged and multiplied and then transmitted over the public switched telephone network, to the calling party location. At the calling party location, the packets are deciphered. In one aspect of the invention, the voice can be digitized at the part of the party calling ISDN and compress the voice and digitized data. BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and other objects and advantages of the present invention will be more fully appreciated from the following description, with reference to the accompanying drawings in which: Figure 1 is a general view showing an aspect of the system the present invention having a calling party with an ISDN connection and a destination party having a POTS connection. Figure 2 illustrates the different types of Tip-Ring (POTS) and ISDN scenarios that can be employed with the method and system of the present invention. Figure 3 is a high-level flow diagram illustrating an aspect of the method and system of the present invention. PKSCRTPCTQN DBTAT .ADA Now with reference to Figure 1, there is illustrated an overview of the system of the present invention, which allows simultaneous transmission of voice and data through a public switched telephone network and a line over a telephone, between a calling party location, generally indicated at 10 and having an ISDN connection and a destination part location, generally indicated at 12, and having an analog POTS connection to the public switched telephone network 14. This analog connection is also denominates a connection of Tip-Ring (T / R). In the illustrated embodiment, the destination part location 12 comprises residential facilities. In Figure 1, the calling party location 10 is illustrated as a Private Branch Exchange (PBX) and includes a Basic Rate Interface (BRI) that can employ a single B channel at 64 kbps. As illustrated, an ISDN telephone 17a, and standard 17b computer, are connected in a processor that is a Private Switchboard. The processor 18 includes a software program with advanced protocol as explained below. The software program together with the processor 18 is referred to below as the Logical Support Platform 20. The Logical Support Platform 20 emulates a simultaneous data and voice protocol and signals for a specialized modem 22, located at a part site. Target 12. The Logical Support Platform 20 also includes the software that works with the processor 18 to determine if a calling party location 10 has an analog POTS connection.

In accordance with the present invention, after the Logical Support Platform 20 determines that the destination part location 12 has an analog POTS connection, a connection is created between the calling party location 10 and the destination party location. 12. The data and voice band signals are formed into packets and ultiplejan at the calling party location 10 with the Logical Support Platform and then transmitted as packets through the public switched telephone network 14 to the modem 22, located at the destination part location 12. This modem 22 has appropriate specialized firmware records 24 that will work with a special protocol to unpack the packets into separate digital signal and voiceband components, and then demodulate the signal components digital within the modem 22. The demodulated data signals are sent to a data terminal such as a computer 26, and the signals of speech band are sent to an analog terminal, such as the standard POTS telephone 28. As illustrated, the destination part location 12 includes a computer 26 and telephone POTS 28 connected directly to the modem 22. In accordance with the present invention , the modem includes programs recorded in unalterable memory 30 that modulate the digital signal from the computer and form packets and multiply the voice and data band signals received from the computer 26 and the location of the destination part 12. The packets are then transmitted through the public switched telephone network 14 to the calling party location 10. As is well known to those of skill in the art, network switches 32, typically 5ESS switches, convert digital to analog signals, as signals reach the destination part location 12 and its modem 22. In accordance with the present invention, the modem 22 takes the received signal from the network 14, and the decomposes into data and voice components to signal to the telephone and computer, as required. Now with reference to Figure 2, there is illustrated a public switched telephone network and various scenarios and different analog ISDN (T / R) systems that can be employed with the present invention. In the illustrated embodiment, conventional computers 40 and telephones 42 can be connected to an analog line or T / R. Additionally, ISDN phones 44 and standard 46 computers can be connected to lines that have an ISDN connection. End-user devices 48 can be connected to enhanced network services 50, of network 14 and a bridge 52 can be connected to a Private Switchboard 54 and an ISDN / POTS 56. Also, a director 58 can be connected to a Private Switchboard 60 and then connect to a plurality of computers 62. The ISDN telephones 44 would be included within the PBX 60. Another computer 46 and telephone 44 are connected inside a PBX 64, which connects to the Network through a PRI / BRI as it is known by those with skill in the technique. Another computer 46 and telephone 44 can be connected to a PBX 66, which includes a Telephone-Computer Synchronization Interface (CTSI). The Logical Support Platform 20 provides algorithms for advanced digital signal processing (DSP). The analog connection at the destination part location 12 does not include appropriate software to rectify the problem of information transfer between the digital ISDN line and the analog line. The digital signal processing algorithms as part of the Logical Support Platform 20, can classify the various signals because that software at the calling party location 10 determines in advance the capabilities of the other endpoint, i.e. the connection analog in the destination part location. The Logical Support Platform 20 at the calling party location 10, also, reconstructs the speech before the analog connection and can extract digitized text as long as it knows when there is text present. This is determined by the Logical Support Platform 20. You can simultaneously recover voice and data by interpreting a converted waveform. The normal line interface is employed and supported by an intelligent DSP as is known to those skilled in the art. The DSP algorithm works in a way, when the destination part location 12 has a digital ISDN connection and works in another way, when it has an analog connection as in the present invention. The DSP is programmable on the Logical Support Platform 20. This technique used for point-to-point calls can be used for multi-point conferences equally. As long as the exchange handling the conference is aware of the endpoint capabilities, such as ISDN or POTS connection, it can instruct its own DSP to deal with the situation correctly. In accordance with the present invention, voice and data can be compressed and digitized. The system can include advanced voice and data with an error correction scheme, as well as control commands and frame information. Other services may be included that will be apparent to those skilled in the art. Now with reference to Figure 3, a high level flow diagram showing the method of the present invention is illustrated. For comprehension purposes, all blocks are numbered with the sequence starting from 100. When a call is made from a calling party location 10, to a destination party location 12, the Logical Support Platform 20, first it determines if the destination part location 12 has an analog POTS connection (block 100). When so determined, a connection is created between the calling party location 12 and the destination part location 12 (block 102). The voice and data band signals are formed into packets (block 104) and multiplejan (block 106) at the calling party location, by the Logical Support Platform 20. The packets of voice and data bands are multiplied, then they transmit through the Public Switched Telephony Network to the modem 22, located in the destination part location (block 108). The packets are demultiplied into separate digital signal and speech band components (block 110) and the digital signal components are demodulated within the modem (block 112). The demodulated data signals are then sent to a data terminal, such as the computer (block 114) and the voiceband signals are sent to an analog terminal such as the POTS telephone (block 116). Any signals generated by the computer and the telephone at the destination part location are received in the modem (block 118). The voice and data band signals are formed into packets (block 120) and multiplejan (block 122). The finalized packets are then transmitted through the public switched telephone network to the calling party location (block 124). The packets are demultiplied at the calling party location (block (126).

It will be understood that the foregoing description of the invention is merely intended as illustrative thereof, and that other embodiments, modifications and equivalents may be apparent to those skilled in the art, without departing from its spirit. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims

CLAIMS 1. A method for simultaneously transmitting voice and data over a public switched telephone network and over a telephone line between a calling party location having an integrated services digital network connection and a destination party location having an old simple telephone service analog connection, characterized in that it comprises: determining whether the destination part location has an analog old simple telephone service connection, creating a connection between the calling party location and the part location of destination, form packets of the voice and data band signals and aggregate them in the calling party location, transmit the voiceband and multiple data packets through the public switched telephone network to a modem located in the location of destination part, demultiple packets into separate components of voice band and digital signal and demodulates r the digital signal components within the modem, and send the demodulated data signals to a data terminal and the voice band signals to an analog terminal. The method according to claim 1, characterized in that it includes modulating data signals within the modem, forming packets and multiplying the data signals and any voice bands, which are received from the destination part location, transmitting the packets Grouped over the public switched telephone network to the location of the calling party, and demultiple the packets at the location of the calling party. 3. The method according to claim 1, characterized in that it includes digitizing the voice in the location of the ISDN calling party. 4. The method according to claim 1, characterized in that it includes compressing the digitized data and voice. 5. A system for simultaneously transmitting voice and data over a public switched telephone network and over a telephone line between a calling party location having an ISDN connection, to a destination party location having an analog connection POTS, characterized in that it comprises: processing means placed in the calling party location, to determine if the destination part location has an analog POTS connection, means to generate a telephone connection between the calling party location and the location of destination part having an analog POTS connection, means for bundling the data and voiceband signals and ultiplejar the packets at the calling party location, means for transmitting the voiceband packets and multiplexed data through from the public switched telephone network to the destination part location, and a modem at the destination part location for reci If the packets transmitted from the calling party location are received, the modem includes processing means to a) demultiplate the packets into separate digital and voiceband components, b) demodulate the digital signal components within the modem, and c) send the data signals demodulated to a data terminal and voice band signals to an analog terminal. The system according to claim 5, characterized in that the modem includes means for modulating data signals within the modem, means for forming packets and multiplying the data signals and any voice bands that are received from the location of part of destination, means for transmitting the multiple packets through the public switched telephone network to the calling party location and means for demuxing the packets at the calling party location. The system according to claim 5, characterized in that it includes means for digitizing the voice at the calling party's ISDN location. The system according to claim 5, characterized in that it includes means for compressing digitized voice and data.