On 2023-03-03 12:47, James Knott via talk wrote:
On 2023-03-03 12:17, James Knott wrote:
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.

If you're on Fibe, you only have your own wire out to the node in the neighbourhood.  From there, it's shared.  Not much different from cable.
Well with cable you can have 1000 people connected to the line card on the node before your on the shared back-haul.
So its shared up front and on the back.


Forgot to mention, even with original ADSL, with the dedicated copper pair, going back to the CO, the Internet connection was still shared at the DSLAM.  Several years ago, I was setting up some DSLAMs for Sprint Canada, just before Rogers bought them.  Each DSLAM shelf had 32 lines connected to it, but all that traffic wound up on a DS3, which was 45 Mb.  So, you had 32 ADSL lines sharing that 45 Mb.

That kind of makes my point.

The last DSLAMs I looked at well over 5 years ago were 24 ports with multiple 1G back-hauls
That is less than full bandwidth to less than half the available bandwidth.

On the other hand DOCSIS can support something like 1000 subscribers on a cable interface, and then you have the same issues of back-haul.

GPON and 10-GPON I believe are limited to 128 subscribers per fiber interface.

In all cases we have a funnel.
The question is how big is the mouth of the funnel and how small is the throat.

I don't have a particular love for one technology over another.
But with decades of experience with DSL I am familial with all the warts and features of the technology.

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