The Transmission of IP Over the Vertical Blanking Interval of a Television Signal (RFC2728)
Original Publication Date: 1999-Nov-01
Included in the Prior Art Database: 2019-Feb-10
Internet Society Requests For Comment (RFCs)
R. Panabaker: AUTHOR [+2]
This document describes a method for broadcasting IP data in a unidirectional manner using the vertical blanking interval of television signals. [STANDARDS-TRACK]
Network Working Group R. Panabaker Request for Comments: 2728 Microsoft Category: Standards Track S. Wegerif Philips Semiconductors D. Zigmond WebTV Networks November 1999
The Transmission of IP Over the Vertical Blanking Interval of a Television Signal
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (1999). All Rights Reserved.
This document describes a method for broadcasting IP data in a unidirectional manner using the vertical blanking interval of television signals. It includes a description for compressing IP headers on unidirectional networks, a framing protocol identical to SLIP, a forward error correction scheme, and the NABTS byte structures.
This RFC proposes several protocols to be used in the transmission of IP datagrams using the Vertical Blanking Interval (VBI) of a television signal. The VBI is a non-viewable portion of the television signal that can be used to provide point-to-multipoint IP data services which will relieve congestion and traffic in the traditional Internet access networks. Wherever possible these protocols make use of existing RFC standards and non-standards.
Traditionally, point-to-point connections (TCP/IP) have been used even for the transmission of broadcast type data. Distribution of the same content--news feeds, stock quotes, newsgroups, weather
Panabaker, et al. Standards Track [Page 1]
RFC 2728 IPVBI November 1999
reports, and the like--are typically sent repeatedly to individual clients rather than being broadcast to the large number of users who want to receive such data.
Today, IP is quickly becoming the preferred method of distributing one-to-many data on intranets and the Internet. The coming availability of low cost PC hardware for receiving television signals accompanied by broadcast data streams makes a defined standard for the transmission of data over traditional broadcast networks imperative. A lack of standards in this area as well as the expense of hardware has prevented traditional broadcast networks from becoming effective deliverers of data to the home and office.
This document describes the transmission of IP using the North American Basic Teletext Standard (NABTS), a recognized and industry- supported method of transporting data on the VBI. NABTS is traditionally used on 525-line television systems such as NTSC. Another byte structure, WST, is traditionally used on 625-line systems such as PAL and SECAM. These generalizations have exceptions, and countries should be treated on an individual basis. These existing television system standards will enable the television and Internet communities to provide i...