Author Topic: Handshake protocol origins  (Read 684 times)

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Offline UnixonTopic starter

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Handshake protocol origins
« on: November 07, 2020, 11:38:44 pm »
Historical question: when and how 2-phase and 4-phase handshake protocols first originated in electronics?
 

Offline helius

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Re: Handshake protocol origins
« Reply #1 on: November 10, 2020, 12:38:07 pm »
I think you're referring to flow control ("2-phase") and arbitration ("4-phase")?
I'm not sure at all when they were first developed, but flow control has to be very old. Digital teleprinters came in the late 1800s or early 1900s as an outgrowth of the telegraph. In telegraphy, there were conventional ways of letting the other party talk ("Over" or "Go Ahead" were abbreviated with special morse codes). In a two-way teleprinter circuit, that kind of convention could be used to switch access to a shared circuit. Later on with modems flow control was accessed using RTS (ready to send) and CTS (clear to send) signals.
Arbitration is needed for multi-master access to shared media, which includes computer buses and also things like Ethernet. Again I don't know the order of discovery, but the IBM 360 definitely had a form of arbitration for its channel architecture and most other large computers of the 1960s had similar features.
 

Offline UnixonTopic starter

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Re: Handshake protocol origins
« Reply #2 on: November 10, 2020, 02:57:15 pm »
I think you're referring to flow control ("2-phase") and arbitration ("4-phase")?
I was referring to methods of organizing flow control in asynchronous circuits design.
This is often mentioned in literature as "2-phase bundled data" and "4-phase bundled data" conventions.
https://static.docsity.com/documents_pages/2013/03/17/874400db135e3b94cf39d492e412b844.png

My attempts to trace origins showed that earliest published works that at least resemble the idea are somewhere between works of David E. Muller in 1954 and Claude Shannon in 1939.
 


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