Re: tlug: RJ-11 in the UK?

[Jim Tittsler <jwt-tlug@example.com>]

On Thu, Oct 15, 1998 at 06:12:44PM +0900, Jonathan Byrne - 3Web wrote:
> >Another thing to watch for is the "guard tone" setting.  I think
> 
> What's a guard tone?

Guard tones were used by the answering V.22/V.22bis modems during the
handshake sequence in the UK (1800Hz) and some other European countries (uh,
I forget, 500Hz?).  I think their main purpose in life was to give a solid
carrier that could be used to control the echo cancellation on the phone
network.

-- 
Jim-but-I-haven't-done-a-modem-in-years-Tittsler, Tokyo   ICQ: 5981586


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