[clug] ADSL2+ speeds (Sakari Mattila)
Alex Satrapa
grail at goldweb.com.au
Thu Feb 12 23:06:57 GMT 2009
On 13/02/2009, at 00:36 , smattila at tpg.com.au wrote:
> He changed the pair the telephone was using and now all is well.
> There is big difference between
> pairs in big cables. There is cross-talk between the pairs.
Not just cross-talk, but due to the way cable is terminated (eg: punch-
blocks), you can end up with stray capacitance at the terminator
simply due to the technician not checking that the ends of the were
were trimmed at the punch block (rather than having another half an
inch of copper radiating from the other side), then there's the
possibility of wire being stretched as it's being manhandled into
various pits and risers.
> I has been happy with "3" 1 - 6 GB per month 3G connection. Not
> fast, about 2 Mb/s
> at best, in theory 3.6 Mb/s. Reliable, but depends on other 3G
> users. It is uncapped and about $ 110 per GB when over the limit.
> One trick to know and avoid: "3" RF-modem can make alternative
> GSM connection, uncapped.
I will never ever use "3" for this reason. If you drop off 3G
connection, you are charged at normal data rates for GSM/GPRS.
Actually, that should be "when" not "if".
Watching my girlfriend's supposed-3G connection through a provider
whose name is not relevant, we'll be sitting at the dining room table
with a 3G signal, and in the course of 10 minutes it will drop to GSM,
back up to GPRS, then sometimes back up to 3G. Even worse, in the
course of these channel/speed adjustments it will randomly get a new
IP address. The best way to guarantee 3G connectivity is to keep hands
off the computer (ie: do nothing for a while). The best way to
guarantee that the connection drops back to GPRS or GSM is to start
using the Internet.
3G wireless works fine for casual web browsing, but is unusable for
anything that requires a session for longer than a few minutes, or
more than a few dozen kbps speed.
This dodgey connectivity occurs in suburbs such as Holt and Isabella
Plains. In some suburbs we have no connectivity at all (eg: certain
streets in Dunlop). My experience has been that having no connectivity
is easier to cope with than having dodgey 3G connectivity.
In the six months we've been using it, had we been using "3" we would
have racked up a couple of hundred dollars in traffic charges.
Thankfully we're not using "3".
Alex
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