On 2023-03-03 10:11, James Knott via talk wrote:
On 2023-03-03 09:37, Alvin Starr via talk wrote:
Rogers offers 2.5Gbit fiber in some places.
Feel free to correct me but I believe that all the "optical" and
co-axial cable based services are shared(GPON).
So you could be sharing your 2.5Gb with up to 100 other people and if
everybody decides to download a few hundred GB of video files at the
same time you could be seeing speeds like 25Mb.
So last mile bit rate is almost always much greater than the
bandwidth that is available from the end node(home) to the core(151
front).
I have seen 6Mbit DSL reduced to hundreds of bps by chronic back-haul
congestion.
So a fiber/cable modems buffering with a 1Gb output may be enough to
cover the practical bandwidth available on a reasonably loaded network.
ADSL always comes in as a poor 2nd to cable. I'm on Rogers with a
500/30 package. I rarely see less than about 920/32.
That is pretty good, getting just about 2x the service speed.
xDSL has some serious speed limitations trying to run over old POTS
copper lines.
I am amazed that they can get 100Mb over old copper lines.
The upside of ADSL is that it is wire speed from the customer point to
the node equipment is what you can get before back-haul.
With cable the all the customers on the segment are sharing the same
bandwidth.
So if your the first one on the cable you have the full speed to
yourself but if your number 100 then you and the 99 other people are
sharing that speed.
Everybody oversells their bandwidth because not all your customers will
be using the full bandwidth all the time.
Generally the averaging works well but at some point your customers
start using more of their bandwidth and your back-haul and upstream
bandwidth need to increase.
The carriers ran into this problem years ago and resorted to deep packet
inspection and heavy duty traffic management because the cost of
increasing the back-haul was higher than the cost of the fancy routers.
All that infrastructure is still there and in use, which is the reason
you will see blazing speeds using speedtest but not so fast with
real-life data.
Are there any ISPs distributing from 151 Front W. to customers? (I
worked in that building for 17 years.) The nearest Bell offices are
on Simcoe, near Dundas and on Adelaide, near Bay. I'm not sure where
the nearest Rogers office is and I don't know where Beanfield is. 151
Front W. is the Torix Internet Exchange point, where various carriers
and ISPs meet to exchange data. For some reason, Bell doesn't seem to
be there.
https://www.torix.ca/
https://en.wikipedia.org/wiki/Toronto_Internet_Exchange
I picked 151 front as a common point that people would know as a
backbone point.
There are a hand full of IX points in Toronto now but 151 is still the
biggest.
There is also a reasonable likelihood that some of your traffic will
still transit 151 Front.
Bell has facilities in the building but last time I looked was not a
member of TORIX.
I am sure there are still some boutique ISPs serving from 151 front.
When UUNET moved into 151 front the reason I was given was because of
the adjacent CO.
That was also LONG before the building became a data center, and lots of
big Bell COs are gone now or nothing more than a small brick building,
so that CO may have gone also.
https://www.speedtest.net/result/14428650936
Never trust speedtests because the carriers manipulate the traffic to
prioritize speed test sites.
Try copying a multi GB file and see what your speeds are.
Better still wrap it in a VPN.
The point I would like to make is that the speed of the cable into your
house is seldom if ever the same as the throughput of the overall
backing network.
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Alvin Starr || land: (647)478-6285
Netvel Inc. || Cell: (416)806-0133
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