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kevmetric
Competition, Open And Free Markets
join:2002-01-15
| Interleaved vs. Fast Mode
As you can see, most DSL customers
are put on the Fast Mode first, since
there's a higher efficiency (more data,
less error correction code in each packet).
Also, Fast Mode allows users to have quicker,
smaller ping times.
Unless a higher gauge wire is used in
the local loop, or a the power output
of the modem is increased (for a greater
number of frequencies) the max distance
in the loop, to perserve sync is about 5.5 km.
The sync would be roughly 230 kbps.
On the other hand, if the interleaved
channel is used, due to poor wire or
interference on the loop, a small amount
of data is transmitted per packet, to
make room for more error correction
code. This means a lower efficiency
exists, to get more reliability and
less errors, loss of sync or dropped
or lost packets. The ping times or
delays would increase, as well.
Some carriers suggest that at 3.6 km
distance, a subscriber could achieve
3 Mbps ...however, real world
conditions usually advise 2.7 km, from
what I've read on this forum, for example.
[text was edited by author 2002-09-06 07:14:53] | |
quanta
Premium
join:2002-05-07
Toronto, ON |  You should put this in the DSL FAQ.
--
Happy customer of LONDON14CG0 | |
kevmetric
Competition, Open And Free Markets
join:2002-01-15
| reply to kevmetric
The funny thing is that, the computer OEM
manufacturers (HWP, CPQ, Dell, IBM) were
in 1998, extremely pressured to roll out
DSL for customers, so they put either
Wildwire DSL modems in the computers (for
the Lucent implementations) or G.Lite
DSL modems (for an industry consensus
implementation) in the computers
themselves. None were compatible with
the Canadian DMT implementation, and
as well, Nortel came up with the CAP
implementation (960/120), also proprietary.
The DSL rollout only began as recently as
Winter 1997/ Spring 1998 ....with Nortel's
development in the labs, that DSL
technology, and Lucent as well.
Shortly afterwards, Alcatel stepped into
the game and took it over. In Canada, anyway.
I guess that's where the internet and
I.T. bubble came from ... everyone predicting
that along with high speed DSL service,
at very low cost, huge 1 Mbit speeds, for
85% of the population immediately available,
everyone would begin a new spending cycle
for Windows, computers, printers, screens,
sound systems, and more, driving the price
of those high tech companies through the
roof.
As of now, only Microsoft has benefitted, with
windows XP.
[text was edited by author 2002-09-06 11:53:20] | |
renton
Come On You Spurs
Premium
join:2002-01-05
North York, ON | reply to kevmetric
Thanks Kev, excellent info | |
kevmetric
Competition, Open And Free Markets
join:2002-01-15
| reply to kevmetric
Some people are predicting that ethernet
cards and routers will be going the
way of the dodo bird, in a couple of
years, as soon as we can have an ATM
media concentrator in the back of your
computer. This way, ATM goes straight
from the DSLAM to the CPU ...with less
so-called middle-men in between, such
as PPP, etc.
It's up in the air, I would guess. The dialup
internet will still be here 10 years from now,
surely. So, chances are PPPoE as well ...with
a nic/router. | |
quanta
Premium
join:2002-05-07
Toronto, ON | reply to kevmetric
ATM? Yeah right. Too expensive.
--
Happy customer of LONDON14CG0 | |
kevmetric
Competition, Open And Free Markets
join:2002-01-15
| reply to kevmetric
Actually, there's no requirement for
an Ethernet-based port, in the back
of a computer.
What's required, is merely a device,
in a PC (like a PC-Card) to have
ATM capability, with an RJ11 in the back.
At this time, it's too expensive.
That's why most DSL modems have an RJ45
port, going to a nic with RJ45... those
nic cards are selling for the price of
a movie plus popcorn.
No other reason exists, than cost, why
users don't have an ATM port, for an ATM
chord into a ATM bus, on a PC Card,
in the back of a computer.
It is my understanding, that CO's and
backbones are made up of ATM DS3's, for
example.
[text was edited by author 2002-09-17 00:59:57] | |
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