Asymmetric implementation of DSVD for voice/data internet access

• US 6,904,037 B2
• Filed: 11/05/1996
• Issued: 06/07/2005
• Est. Priority Date: 11/05/1996
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Oran, David R., FitzGerald, Cary W., Knappe, Michael E.
• Primary Examiner(s): NGUYEN, STEVEN H D
• Application Number:
  US08/743,837
• Publication Number:
  US 20030026243A1
• Time in Patent Office: 3,136 Days
• Field of Search: 370351-356, 370/505, 370400-402, 370492-495, 370465-466, 370/474, 375/222, 379 9301- 9305, 379/93.09, 379/93.14, 379/91.34, 379/88.17, 379/90.01, 379/93.34
• US Class Current: 370/352
• CPC Class Codes: H04L 12/5692 Selection among different networks
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

Voice and data streams transmitted from a conventional DSVD modem are interfaced directly to a network access server through a modified DSVD modem according to the invention. The voice and data is formatted into network data packets that are then routed directly to different endpoints through the network access server. The modified DSVD modem includes a packet framer that removes conventionally transmitted V.76 DSVD framing formats and stuffs bytes into the voice and data to form network packets. The network access server then routes the voice and data packets to the different endpoints identified in a packet header. Since the voice and data are output from the DSVD modem in data packets, the voice and data can be routed more efficiently to different network endpoints.

Claims

1. A Digital Simultaneous Voice/Data (DSVD) endpoint, comprising:

a data port interface for coupling to an access server or telephony gateway for generating an Internet Protocol (IP) voice packet to transmit to a telephone having an IP address corresponding to the IP voice packet and an IP data packet to transmit to a computer having an IP address corresponding to the IP data packet via an Internet network and configured to transmit and receive both the voice packets and the data packets;

a circuit switched interface for coupling to a circuit switched network;

a modem configured to receive and transmit a Digital Simultaneous Voice/Data (DSVD) data stream containing DSVD multiplexed voice and digital data from a remote DSVD endpoint; and

a framer and interleaver configured to interleave the voice and data packets together, and add DSVD madam framing to the interleaved voice and data packets;

the framer and interleaver further configured to remove DSVD modem framing from the DSVD multiplexed voice and digital data received over the circuit switched interface and transmit both the voice and digital data over the data port interface over the Internet network to the access server or telephony gateway;

the DSVD endpoint not compressing or decompressing the voice data contained in the DSVD data stream or the voice packets transmitted between the remote DSVD endpoint and the access server or telephony gateway and deriving the IP addresses corresponding to the IP voice packet and the IP data packet using only the DSVD data stream.

2. A DSVD endpoint according to claim 1, wherein the modem comprises a V.34 modem.

3. A DSVD endpoint according to claim 2, wherein the framer and interleaver adds V.76 framing before sending the interleaved voice and data packets to the V.34 modem.

4. A DSVD endpoint according to claim 1, wherein the framer and interleaver segments the voice and data packets received over the data port and interleaves the segmented voice and data packets.

5. A DSVD endpoint according to claim 1, wherein the data port interface, circuit switched interface, modem, and framer and interleaver comprise a standalone device operating in a separate enclosure from any access server or telephony gateway coupled to the data port interface.

6. A method for processing a Digital Simultaneous Voice/Data (DSVD) data stream, comprising:

receiving and transmitting the Digital Simultaneous Voice/Data (DSVD) data stream containing DSVD multiplexed voice and digital data over a circuit switched interface located in a first DSVD endpoint and establishing the DSVD data stream with a second DSVD endpoint;

removing DSVD modem framing from the DSVD multiplexed voice and digital data received over the circuit switched interface;

transmitting both the voice and digital data as interleaved packets over a same data port interface of the first DSVD endpoint to an access server or telephony gateway for generating an Internet Protocol (IP) voice packet to transmit to a telephone having an IP address corresponding to the IP voice packet and an IP data packet to transmit separately to a computer having an IP address corresponding to the IP data packet via an Internet network; and

the first DSVD endpoint not compressing or decompressing the voice data contained in the DSVD data stream or the voice packets received over the data port interface between the second DSVD endpoint and the access server or telephony gateway.

7. A method according to claim 6, including using a V.34 modem for transmitting and receiving the DSVD data stream.

8. A method according to claim 7, including removing V.76 framing from the DSVD data stream received from the V.34 modem.

9. A method according to claim 6, including segmenting the voice and data packets and interleaving the segmented voice and data packets.

10. A method according to claim 6, including:

enclosing circuitry for transmitting and receiving the voice packets and data packets, and transmitting and receiving the Digital Simultaneous Voice/Data (DSVD) data stream in a standalone DSVD enclosure; and

coupling the stand alone DSVD enclosure to a stand alone access server gateway.

11. An electronic storage medium containing software used for processing a Digital Simultaneous Voice/Data (DSVD) data stream, comprising:

code for receiving and transmitting the Digital Simultaneous Voice/Data (DSVD) data stream containing DSVD multiplexed voice and digital data over a circuit switched interface located in a first DSVD endpoint and establishing the DSVD data stream with a second DSVD endpoint;

code for removing DSVD modem framing from the DSVD multiplexed voice and digital data received over the circuit switched interface;

code for transmitting both the voice and digital data as interleaved packets over a data port interface of the first DSVD endpoint to an access server or telephony gateway for generating an Internet Protocol (IP) voice packet to transmit to a telephone having an IP address corresponding to the IP voice packet and an IP data packet to transmit separately to a computer having an IP address corresponding to the IP data packet via an Internet network; and

code for the first DSVD endpoint not compressing or decompressing the voice data contained in the DSVD data stream or the voice packets received over the data port interface between the second DSVD endpoint and the access server or telephony gateway.

12. An electronic storage medium according to claim 11 including code for using a V.34 modern for transmitting and receiving the DSVD data stream.

13. An electronic storage medium according to claim 12 including code for removing V.76 framing from the DSVD data stream received from the V.34 modem.

14. An electronic storage medium according to claim 11 including code for segmenting the voice and data packets and interleaving the segmented voice and data packets.

15. An electronic storage medium according to claim 11 including:

code for enclosing circuitry for transmitting and receiving the voice packets and data packets, and code for transmitting and receiving the Digital Simultaneous Voice/Data (DSVD) data stream in a standalone DSVD device; and

code for coupling the stand alone DSVD device to a stand alone access server gateway.

16. A system for processing a Digital Simultaneous Voice/Data (DSVD) data Stream, comprising:

means for receiving and transmitting the Digital Simultaneous Voice/Data (DSVD) data stream containing DSVD multiplexed voice and digital data over a circuit switched interface located in a first DSVD endpoint and establishing the DSVD data stream with a second DSVD endpoint;

means for removing DSVD modem framing from the DSVD multiplexed voice and digital data received over the circuit switched interface;

means for transmitting both the voice and digital data as interleaved packets over a data port interface to an access server or telephony gateway for generating an Internet Protocol (IP) voice packet to transmit to a telephone having an IP address corresponding to the IP voice packet and an IP data packet to transmit separately to a computer having an IP address corresponding to the IP data packet via an Internet network; and

means for the first DSVD endpoint not compressing or decompressing the voice data contained in the DSVD data stream or the voice packets received over the data port interface between the second DSVD endpoint and the access server or telephony gateway.

17. A system according to claim 16 including means for using a V.34 modem for transmitting and receiving the DSVD data stream.

18. A system according to claim 17 including means for removing V.76 framing from the DSVD data stream received from the V.34 modem.

19. A system according to claim 16 including means for segmenting the voice and data packets and interleaving the segmented voice and data packets.

20. A system according to claim 16 including:

means for enclosing circuitry for transmitting and receiving the voice packets and data packets, and means for transmitting and receiving the Digital Simultaneous Voice/Data (DSVD) data stream in a standalone DSVD device; and

means for coupling the stand alone DSVD device to a stand alone access server gateway.

21. A Digital Simultaneous Voice/Data (DSVD) endpoint, comprising:

a data port interface configured to communicate with an access server or telephony gateway for generating an Internet Protocol (IP) voice packet to transmit to a telephone having an IP address corresponding to the IP voice packet and an IP data packet to transmit separately to a computer having an IP address corresponding to the IP data packet via an Internet network;

a circuit switched interface configured to communicate with a remote endpoint over a circuit switched network;

a modem configured to establish a Digital Simultaneous Voice/Data (DSVD) data stream containing multiplexed voice and digital data with the remote endpoint; and

a circuit configured to convert between the (DSVD) multiplexed voice and digital data and the IP voice packets and IP data packets;

the endpoint not compressing or decompressing the voice data contained in the DSVD data stream or the voice packets transmitted between the remote endpoint and the access server or telephony gateway.

22. A Digital Simultaneous Voice/Data (DSVD) endpoint according to claim 21 wherein the circuit comprises a framer and interleaver.

23. A Digital Simultaneous Voice/Data (DSVD) endpoint according to claim 22 wherein the framer and interleaver segments the voice and data packets received over the data port and interleaves the segmented voice and data packets.

24. A Digital Simultaneous Voice/Data (DSVD) endpoint according to claim 23 wherein the data port interface, circuit switched interface, modem, and framer and interleaver comprise a standalone device operating in a separate enclosure from any access server or telephony gateway coupled to the data port interface.