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Technology Stocks : ADSL, ISDN, and the future.
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To: Joan Osland Graffius who wrote (96)3/28/1996 12:08:00 PM
From: yard_man   of 198
 
Yes, I was referring to the bandwidth constraints of the two media:
the telco's twisted copper pair lines and the cableco's coaxial cable.
The coaxial cable has at least 100:1 advantage. A year ago I attended
a telecommunications seminar where a consultant included a chart comparing the
number of digitally modulated video channels which could be carried
over a copper loop with the number that could be carried over a
fiber optics/coaxial cable hybrid (i.e. coaxial cable for the last
to your house). 'Telco copper loop 1 - 4 channels, coax 1000's.'
This was an "apples to apples" comparison.

ADSL simply uses the best or state of the art digital modulation
technique to get the most out of the physically available transmission
bandwidth in the local loop, which is limited by the twisted copper
pair. It seems to me that if Telcos have any advantage in the delivery
of data services, these advantages must depend on their switching
networks.
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