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Can cable and DSL modems do data compressions?



 
 
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  #11  
Old August 30th 13, 04:54 AM posted to comp.dcom.modems.cable,comp.dcom.adsl,comp.dcom.xdsl,comp.sys.dcom.xdsl,dsl.help
ps56k[_2_]
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Posts: 2
Default Can cable and DSL modems do data compressions?

hmmm - so tell me - how do they present a "carrier" for any type of wire -
be it telco DSL or coax cableTV ????
just because you have a digital 1 or a digital 0 - it still needs to travel
in the "analog world" via some kind of analog carrier,
which is of course - MODULATION -
oh yeah -
digital TV - now how is that transmitted via over the air waves ?
digital cellphones - what "freq" was that transmitter ?


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  #12  
Old August 30th 13, 06:13 PM posted to comp.dcom.modems.cable,comp.dcom.adsl,comp.dcom.xdsl,comp.sys.dcom.xdsl,dsl.help
Retired[_4_]
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Posts: 3
Default Can cable and DSL modems do data compressions?

On 8/29/13 11:54 PM, ps56k wrote:
hmmm - so tell me - how do they present a "carrier" for any type of wire -
be it telco DSL or coax cableTV ????
just because you have a digital 1 or a digital 0 - it still needs to travel
in the "analog world" via some kind of analog carrier,
which is of course - MODULATION -
oh yeah -
digital TV - now how is that transmitted via over the air waves ?
digital cellphones - what "freq" was that transmitter ?



Re Digital TV, see page 23 Section 5.4 for info on the 8-VSB
Modulation Method carrier used by US terrestrial TV systems

http://www.atsc.org/cms/standards/a5...art-2-2011.pdf

Re cell phone frequencies, it varies by country and "G-type" ( 3G, 4g,
etc)

see here for a listing

http://www.gsmarena.com/network-band...=UNITED+STATES
  #13  
Old September 10th 13, 10:13 PM posted to comp.dcom.modems.cable,comp.dcom.adsl,comp.dcom.xdsl,comp.sys.dcom.xdsl,dsl.help
ps56k[_2_]
external usenet poster
 
Posts: 2
Default Can cable and DSL modems do data compressions?


"Retired" wrote in message
news
On 8/29/13 11:54 PM, ps56k wrote:
hmmm - so tell me - how do they present a "carrier" for any type of
wire -
be it telco DSL or coax cableTV ????
just because you have a digital 1 or a digital 0 - it still needs to
travel
in the "analog world" via some kind of analog carrier,
which is of course - MODULATION -
oh yeah -
digital TV - now how is that transmitted via over the air waves ?
digital cellphones - what "freq" was that transmitter ?



Re Digital TV, see page 23 Section 5.4 for info on the 8-VSB Modulation
Method carrier used by US terrestrial TV systems

http://www.atsc.org/cms/standards/a5...art-2-2011.pdf

Re cell phone frequencies, it varies by country and "G-type" ( 3G, 4g,
etc)

see here for a listing

http://www.gsmarena.com/network-band...=UNITED+STATES


sorry - was being tongue in cheek sarcastic -

people tend to forget that ANY digital representation MUST have an analog
equiv to be transported in the real world,
and this usually involves some form of modulation of a carrier.




 




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