Ascend Archive
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Fw: (ASCEND) Pipeline family and Always On/DI?
Matt Holdrege wrote:
>
> >Matt, the 64kbps D channel in a PRI on the MAX would seem to be just
> >the ticket to terminate these X.25 VC's at the ISP -- without X.75,
> >since both sides are 'DTEs' to the telco. Or am I missing something
> >here. Cost?
>
> X.75 (this this the NNI X.25 version of X.75) happens in the carrier
> network. Not the Max. This is one of the many difficult points to AO/DI.
Most carrier ISDN switches can do X.25 service on the D channel without explicit
X.75. X.75 becomes necessary only when you go from one telco to another, and is
probably best avoided. ;-) Since AO/DI would primarily be interesting to access
*local* ISPs, I don't think this is an issue.
'Difficult points to AO/DI' seem to lie mostly in the carrier's facilities and
organization, not in the IP gear. For a MAX or Pipeline it should just be MP across
nxB + an X.25 VC; I don't see how that can be so terribly complicated...? (Naive
smile...)
> >Dial-up may be dead in two years' time in the US (?), but over here it
> >will take longer. AO/DI would still be of some interest.
>
> Ha-Ha-Ha-Ha (maniacal laugh continues...) Somehow I don't think our 100
> million-odd modems will go away that fast.
I was only quoting established networking gurus.
I may have had it backwards, though. As Jamie Penner (Canada) noted on this list,
they (and us, over in Europe) may have to deal with monopolies that push ADSL on the
basis of cross-subsidies from their telephony services, long before it happens in
the US.
Cheers,
-Peter
---------------------------
Peter Kleynjan
Ixonet bv
Utrecht, The Netherlands
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