"Craig Whitmore" <lennon@orcon.net.nz> wrote:
>Telecom call them 2 Wire A1 leased circuits as far as I know. The only

Telecom defines an analogue (A1 or V1) circuit (according to my rather
elderly copy of the Telecom List of Charges) as, "a 2-wire conditioned
voice-grade circuit meeting ITU specification M.1040, operating between
300 and 3400 Hz."

It happens that the cheapest way to deliver this service, at least if
both ends terminate at the same exchange, is simply to patch the two tail
circuits together, giving a hard-wired pair running from end to end.
But that's not how the service is defined, and there's nothing saying
Telecom can't or won't introduce digital or analogue multiplexing
equipment (e.g. 1+1, 0+2), stick filters in it and so-on. Various
outfits have tried doing DSL type things over A1 or V1 circuits, and a
couple have come horribly unstuck.

-- don

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Received on Sun Aug 26 21:46:36 2001