[GreenKeys] Teletype near Toronto

[Jim Haynes]

On Thu, 28 Apr 2011, Bill Horne wrote:
>
> I guess my real question is whether the 32/33 could be directly
> connected to a DC loop circuit without added equipment; i.e., if they
> had the gas-arc tubes and other safety equipment usually found in
> demodulators that were attached directly to Ma Bell's lines.
>
Sure.  I should let the Bell company guys answer this one instead of
trying to answer it myself, but perhaps the reason Bell Labs wanted
current loop on the basic machines was just so that they could be
operated over existing current loop circuits.  Some of those Bell
Labs guys were pretty old.  Maybe they didn't forsee that modems would
come to dominate the transmission end of things.