"Rob Walker" <(E-Mail Removed)> wrote in message
news:40c4a93c$0$20518$(E-Mail Removed)...
>
> "Dominic" <d.foulkes-(E-Mail Removed)> wrote in message
> news:40c493e5$0$6334$(E-Mail Removed). ..
> > John Appleyard wrote:
> > > We plan to convert our Business Highway to ADSL as soon as our
> > > exchange is enable (June 16). Currently we use the 2 analogue lines
> > > that come with Highway for a fax (Hewlett Packard G95 all in one),
> > > and an Ingenico TT41 credit card machine thingy.
> > >
> > > I've heard that some new faxes may be incompatible with ADSL, and the
> > > bank who rent us the credit card machine say that there may be
> > > communications problems with "digital lines" (though they won't say
> > > what they mean by that).
> > >
> > > Q. Can the fax and credit card machine work over our ADSL line? Or
> > > should we rent a second line for analogue devices?
> >
> > ADSL is an analogue service; your ISDN (Highway) line will be converted
to
> > an analogue line to support ADSL. There should be no problems using a
fax
> or
> > credit card machine on an ADSL line (except that some filters are not
> > compatible with certain fax machines).
>
> Well, that's not strictly true. What does the 'D' is ADSL stand for if not
> digital. It is a digital servcie but co-exists on a standard analogue PSTN
> line.
It's not strictly true to say that it is digital either. ADSL uses analogue
modulation. There was a lengthy discussion about this not long ago on here,
and it's not really relevant here. The point is that you cannot have ADSL on
an ISDN line without BT first downgrading it back to an analogue phone line.
An ISDN line or variant thereof is what is the merchant bank meant by a
'digital line' in this context.
Dominic
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