Transport protocol conversion method and protocol conversion equipment

• US 6,557,031 B1
• Filed: 09/04/1998
• Issued: 04/29/2003
• Est. Priority Date: 09/05/1997
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Suzuki, Toshiaki, Shibata, Koichi, Mimura, Itaru
• Primary Examiner(s): Coulter, Kenneth R.
• Assistant Examiner(s): KANG, PAUL H
• Application Number:
  US09/148,326
• Time in Patent Office: 1,698 Days
• Field of Search: 709/203, 709/218, 709/217, 709/230, 709/219, 709/249, 709/246, 709/236, 710/33, 348/7, 725/148, 725/149, 725/63-72, 725/86-104, 725/105-134
• US Class Current: 709/218
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/104 in the network
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/085 specially adapted for interworking of IP-based networks with other networks
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/2381 Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network transmission of MPEG streams over ATM H04L12/5601
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 21/64707 for transferring content from a first network to a second network, e.g. between IP and wireless

Abstract

A transfer protocol conversion method and a protocol conversion equipment are disclosed in order to transmits TS packets for a CATV network, a DAVIC network or the like by use of IP packets for the Internet. In a network using TS packets, the transmission is made with an Internet protocol header stored in a private field of an adaptation field defined in the TS packet. An equipment for protocol conversion between a network using TS packets and an Internet forms an IP packet for the Internet by use of the header transferred by the private data. Further, lower 8 bits of the IP address of an IP packet and lower 8 bits of the PID value of a TS packet are made the same and upper 24 bits of the IP address are converted into a 5-bit value so that the converted 5-bit value is made to correspond to upper 5 bits of the PID value.

Claims

1. A CATV system comprising:

a first CATV network for transmitting a digital video signal compressed in accordance with the Moving Picture Experts Group-2 (MPEG2) system;

a second CATV network for transmitting a digital video signal compressed in accordance with the MPEG2 system;

an Internet Protocol (IP) network using the IP prescribed by the Internet Engineering Task Force (IETF);

a first interworking unit connected to said first CATV network and said IP network said first interworking unit converting the digital video signal transmitted in said first CATV network to a packet based on the IP and transmitting the packet to said IP network; and

a second interworking unit connected to said second CATV network and said IP network, said second interworking unit converting the packet to a digital video signal compressed in accordance with the MPEG2 system and transmitting to said second CATV network the digital video signal converted thereto from the packet in said second interworking unit.