Technically Magazine serial Transmission had a very (too) intimate relationship between text and subtitles - which is why one entity (Oracle) had to do both,
Magazine parelell is a much better system as any magazine could be transmitted on any line at any time - !
When did parallel magazines start? I remember one of the services announcing a new faster method of transmitting and then in the late 80s Ceefax reorganised itself into 6 magazines.
But I always remember sections being seperate - the 100s and 200's on Oracle and the Telesoftware on the 700s seperate to the rest of Ceefax
I don't know ..... but mid late 80s ... it still was relatively "new" when I got involved in 1989
But mag parallel does not always mean faster text at a page throughput level.
But it does give more control over cycle time ...but it is not easy to understand..
as number of pages per mag , how many rows per page,
His many lines allocated, what other magazines in the stream ,
How do you sequence them ? Do you have any out if sequence ( timer) pages
They All interact ...
Just for correctness Ceefax transmitted mag 7 Telesoftware just like any other page .. it's just that they were not edited like the text pages but loaded directly into the transmission system.
But mag 7 on itv was page based data brodacasting with a separate company and systems,
Like so many things in teletext text .... magazines were a mix of technicality ..a byte in the page header x/0 and the wish to have sections on news city sport etc...
I thought that most itv playout used inserters at the vt machines ...
The BBC used this pre network transmission area
The the NTA used VITC and output inserters
The Digital area went to the correct system of source inserters include news studios and policing on the output of the playout suite,
The Broadcast centre went to output inserters ( as servers would only play out programmes with subtitles in the VBI at ingest ..which of course was before they were created !)
Something that many people don't understand these days is that communications was serial line (often on dial up) and a 9k6 connection was fastin 1990
but was used into this century !
Last edited by Technologist on 12 May 2020 1:41pm
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