[GreenKeys] TTY protocol

[Duncan M. Brown]

Sam: Do  you have any sources for the pre-WWII tape relay & ZCZC uses??

Dave:  I saw that Wikipedia article, too.  However, "NNNN" is not "just a
series single hole punches"  --  "N" is 3rd & 4th bits.

  --Duncan


> [Original Message]
> From: Sam Hallas <s.hallas at ntlworld.com>
> To: Dave Meier <n4mw at msn.com>
> Cc: Greenkeys <greenkeys at mailman.qth.net>
> Date: 17-Aug-08 16:19:38
> Subject: Re: [GreenKeys] TTY protocol
>
> Dave Meier wrote:
> >  I found a wikipedia entry which explained this.  It also said that
> >  the NNNN punched hole pattern was just a series single hole punches
> >  to be easily identifiable to the operator as the tear point.
>
> Dave, I couldn't find the article. Could you post the link, please?
>
> I have a feeling that the use of ZCZC & NNNN predates WWII and most 
> likely started with the cable operators like Cable & Wireless, where 
> torn tape relay was widely used.
>
> Cheers,
> Sam
>
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