Domain hosting & ISP recommendations
Bruce M Simpson
bms at incunabulum.net
Mon Mar 10 15:48:23 GMT 2008
Jamie White wrote:
> I would check you package, because my upstream is now a very nice
> 328kbps up, and I a lot of use of it as well.
> Also, Virgin Media packages advertised all offer the same upstream.
> Sounds like you've been unlucky.
The upstream bandwidth compares very reasonably to other low end
consumer DSL packages, but that's about it, as Jonathan quite rightly
points out, you can get much better upstream capacity if your DSL
provider is set up for that.
To be sure the latency profile of G.dmt-lite/G.dmt vs DOCSIS is
different, I've seen wildly varying claims made for one versus the
other. I personally use DOCSIS because the modem devices allow bridging
directly to the upstream with a public IP, enabling you to run VPN
tunnels OK. ADSL modems generally don't, unless you buy very specific
models, or install an ADSL modem card in a box YOU control.
Do remember that the use of ATM AAL5 is written into the spec for G.dmt.
Its on-link transmission behaviour is deterministic, at least up until
you get to the ATM switch.
DOCSIS uses a CSMA/CD MAC protocol, ie it's non-deterministic unless you
are the only subscriber on the uBR at the head end.
Virgin did recently begin upgrading the NTL and Telewest networks which
they acquired, and consumer units, to DOCSIS 2.0, which may help, but
not in the immediate future. They continue to advertise large downstream
capacity in unsubstantiated-claim-land (aka advertising), but of course
that's their prerogative.
There are bigger concerns about the operation of that network, in terms
of privacy, ie the possible introduction of the Phorm. This in
particular has me thinking of ISP shopping. If they did adopt Phorm,
this would surely trigger a change in terms and conditions allowing folk
to wriggle free without financial suffering.
On the business front, I have had trouble with simple things such as
refunding of payments debited in error by them, so I'm not 100%
confident in that organisation.
At the end of the day, caveat emptor -- the success of consumer
DSL/cable sales largely depends on folk not knowing what they are being
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