[GreenKeys] RCA teleprinter ad on EBAY 381052171359 trans-atlantic

[Lester Veenstra]

When did the first "climbing head" TD's come out?
These were used to "go back and repeat" in an ARQ system.


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Dave
Horsfall
Sent: Friday, November 14, 2014 12:13 PM
To: Greenkeys
Subject: Re: [GreenKeys] RCA teleprinter ad on EBAY 381052171359
trans-atlantic

On Fri, 14 Nov 2014, Jones, Douglas W wrote:

> Sounds like parity for error detection with some kind of ENQ-ACK flow 
> control with NAK used to request retransmission? Hard to tell from this 
> kind of ad, but definitely some kind of error correction protocol.

More like ARQ than FEC (SECDED for example), in other words.

-- 
Dave Horsfall DTM (VK2KFU)  "Bliss is a MacBook with a FreeBSD server."
http://www.horsfall.org/spam.html (and check the home page whilst you're
there)
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