[LINK] NBN upgrade
David
dlochrin at aussiebb.com.au
Mon Nov 22 13:25:16 AEDT 2021
On 2021-11-21 14:24, I wrote:
>>
>> (DSL is a great practical illustration of Claude Shannon's famous theorem IMO. Some modems can even display a bar-chart of the number of bits negotiated per bin over the total bandwidth.)
Out of idle curiosity I had a look at the performance of my own FTTN modem at the end of about 1Km of fairly old, rural & regional, and now rather wet, copper. Each DSL "bin" has 4.3125 KHz of bandwidth.
The number of bits transmitted per bin varies from 1 to 13, and the resulting downstream bitrate per bin varies from 1.2040 to 13.640 Kbit/s.
Now 1.2040 Kbit/s over a single 4.3125 KHz bin sounds to me very like an old 1,200/75 bit/s dialup modem running over a PMG copper tail about 35 years ago. But I now get around 30/6 Mbits/s from the same tail, Claude Shannon be blessed!
DL
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