Method for the transmission and control of audio, video, and computer data over a single network fabric

• US 6,574,242 B1
• Filed: 06/08/1999
• Issued: 06/03/2003
• Est. Priority Date: 06/10/1998
• Status: Expired due to Term

• Current Assignee: Network-1 Technologies, Inc.
• Original Assignee: Merlot Communications Incorporated
• Inventors: Keenan, Ronald M., Barraza, Thomas F., Caceres, Edward R., Deptula, Joseph A., Evans, Patrick A., Setaro, Joseph
• Primary Examiner(s): Nguyen, Steven
• Assistant Examiner(s): DUONG, DUC T
• Application Number:
  US09/327,930
• Time in Patent Office: 1,456 Days
• Field of Search: 370/351,352,353,354,355,356,395.5,395.53,395.61,422,425,473,474,476,493,494
• US Class Current: 370/474
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/4035 in which slots of a TDMA packet structure are assigned based on a contention resolution carried out at a master unit TDM/TDMA multiplex systems per se H04J3/1694; hybrid switching systems H04L12/64
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H04L 2012/644 Star
• CPC Class Codes: H04L 2012/6443 Network Node Interface, e.g. Routing, Path finding
• CPC Class Codes: H04L 2012/6454 Random, e.g. Ethernet
• CPC Class Codes: H04L 2012/6459 Multiplexing, e.g. TDMA, CDMA
• CPC Class Codes: H04L 2012/6475 N-ISDN, Public Switched Telephone Network [PSTN]
• CPC Class Codes: H04L 2012/6481 Speech, voice
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/13 in a LAN segment, e.g. ring or bus
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 49/205 Quality of Service based
• CPC Class Codes: H04L 49/254 Centralised controller, i.e. arbitration or scheduling
• CPC Class Codes: H04L 49/3027 Output queuing
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

A local area network of devices connected to a Communication Switching Module (CSM) carry both delay-sensitive information and non-delay sensitive user data in master Ethernet packets transmitted over the LAN at a constant rate. Signaling and control information from the devices initialize a permanent virtual connection (PVC) between devices and the CSM. The signaling and control information is contained in standard Ethernet packets which are encapsulated along with non-delay sensitive data in the master Ethernet packets and performs various control functions for the LAN devices and the CSM.

Claims

1. In a local area network (LAN) adapted for packet switching using standard Ethernet packets transmitted between a plurality of user terminal equipment devices, said LAN being further arranged to include a plurality of user terminal equipment (UTE) adapters connectable to said devices and at least one Communication Switching Module (CSM), said UTE adapters and said CSM having respective network ports and user ports connected together through a plurality of LAN segments and identified by Media Access Control (MAC) addresses, said UTE adapters and said CSM each having SAR means for segmentation and reassembly of Ethernet packets received by or transmitted from the network ports and user ports, said SAR means being adapted to segment received data of a first delay-sensitive data type and received data of a second non-delay sensitive data type, to encapsulate the segmented data into master Ethernet packets at fixed locations in said packets according to data type, to extract segments of the first and second data types from said packets, and to re-assemble the extracted segments into the first and second data types, and to transmit said master Ethernet packets at a selected constant rate, wherein selected first and second devices each providing data of said first data type are connected respectively to said first and second UTE adapters and require a permanent switched connection for exchange of signaling and control information, the method of servicing devices connected to the UTE adapters, said method comprising:

receiving a first master Ethernet packet at the CSM from a first UTE adapter;

extracting data of the first data type from the first master Ethernet packet using the SAR means;

processing the extracted data;

inserting said extracted data of the first data type into a second master Ethernet packet using the SAR means;

transmitting the second master Ethernet packet to a second UTE adapter, and including the additional steps of

exchanging master Ethernet packets at said constant rate over the LAN segments between the CSM and the first and second UTE adapters;

establishing a full duplex permanent virtual connection (PVC) between each of said UTE adapters and the CSM over a constant bit rate (CBR) variable band width channel for data of the first data type; and

supplying signaling and control information in said master Ethernet packets.

2. The method according to claim 1, wherein the signaling and control information is supplied as data of the first data type.

3. The method according to claim 1, wherein the signaling and control information is supplied as data of the second data type.

4. The method according to claim 3, including the step of:

supplying the signaling and control information in the form of standard Ethernet packets; and

encapsulating the standard Ethernet packets into the master Ethernet packets as data of the second type.

5. The method according to claims 1, wherein said selected first and second devices comprise digital telephones with keyboards, and comprising the additional step of:

employing the digital keyboards of the digital telephones to provide said signaling and control information, whereby the CBR channel may establish peer-to-peer connection from the keyboards to initiate transport of digital voice signals between first and second digital telephones.

6. The method according to claim 1, including the steps of:

connecting a digital telephone with a keyboard as said first device;

providing a wide area network (WAN) interface card in the CSM having a port connectable for full duplex digital data service transmission, the WAN interface card being connected to the SAR means;

employing the keyboard of the digital telephone to provide signaling and control information to the CSM; and

processing signaling and control information and relaying it to the port of the WAN interface card;

whereby the CBR channel may establish connection from the keyboard of the digital telephone to the keyboard of a remote digital telephone.

7. In a local area network (LAN) adapted for packet switching using standard Ethernet packets transmitted between a plurality of user terminal equipment devices, said LAN being further arranged to include a plurality of user terminal equipment (UTE) adapters connectable to said devices and at least one Communication Switching Module (CSM), said UTE adapters and said CSM having respective network ports and user ports connected together through a plurality of LAN segments and identified by Media Access Control (MAC) addresses, said UTE adapters and said CSM each having SAR means for segmentation and reassembly of Ethernet packets received by or transmitted from the network ports and user ports, said SAR means being adapted to segment received data of a first delay-sensitive data type and received data of a second non-delay sensitive data type, to encapsulate the segmented data into master Ethernet packets at fixed locations in said packets according to data type, to extract segments of the first and second data types from said packets, and to re-assemble the extracted segments into the first and second data types, and to transmit said master Ethernet packets at a selected constant rate, the method of servicing devices connected to the UTE adapters, said method comprising:

receiving a first master Ethernet packet at the CSM from a first UTE adapter;

extracting data of the first data type from the first master Ethernet packet using the SAR means;

processing the extracted data;

inserting said extracted data of the first data type into a second master Ethernet packet using the SAR means;

extracting data of the second data type from the master Ethernet packets using the SAR means;

reading the MAC address of the extracted data; and

IF the MAC destination address of the extracted data matches the MAC address of the user port being serviced by the SAR means, THEN processing the extracted data as signaling and control information, and

transmitting the second master Ethernet packet to a second UTE adapter.

8. The method according to claim 7, wherein the second master Ethernet packet is transmitted via a second CSM to the second UTE adapter.

9. In a local area network (LAN) adapted for packet switching using standard Ethernet packets transmitted between a plurality of user terminal equipment devices, said LAN being further arranged to include a plurality of user terminal equipment (UTE) adapters connectable to said devices and at least one Communication Switching Module (CSM), said UTE adapters and said CSM having respective network ports and user ports connected together through a plurality of LAN segments and identified by Media Access Control (MAC) addresses, said UTE adapters and said CSM each having SAR means for segmentation and reassembly of Ethernet packets received by or transmitted from the network ports and user ports, said SAR means being adapted to segment received data of a first delay-sensitive data type and received data of a second non-delay sensitive data type, to encapsulate the segmented data into master Ethernet packets at fixed locations in said packets according to data type, to extract segments of the first and second data types from said packets, and to re-assemble the extracted segments into the first and second data types, and to transmit said master Ethernet packets at a selected constant rate, the method of servicing devices connected to the UTE adapters, said method comprising:

receiving a first master Ethernet packet at the CSM from a first UTE adapter;

extracting data of the first data type from the first master Ethernet packet using the SAR means;

processing the extracted data;

inserting said extracted data of the first data type into a second master Ethernet packet using the SAR means;

transmitting the second master Ethernet packet to a second UTE adapter;

exchanging signaling and control information between said first and second UTE adapters and the CSM; and

dynamically varying the bandwidth of the CBR channel in response to the signaling and control information.

10. The method according to claim 9, including the steps of:

expanding the variable bandwidth to provide for a temporary switched connection between MAC addresses of the first and second UTE adapters for said data of the first data type over a PVC, and

continuing to exchange signaling and control information over the PVC as standard Ethernet packets encapsulated in the master Ethernet packets as data of the second data type, while exchanging data of the first data type at a constant bit rate in the same master Ethernet packets.