 tschmidtPremium,MVM
join:2000-11-12
Milford, NH
kudos:8
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1 edit | reply to batterup
Re: Running dedicated line for DSL said by batterup:The laws of physics must have changed. DSL is an analog signal a T-1 is digital. DSL uses a a frequency a T-1 is 1s and 0s, off and on. Original T1 was pretty crude, used simple bipolar signaling. T-1 was developed in late 50s, early 60s. At that time semiconductor technology was very limited. Even so digital carrier was a tremendous advantage over analog FDM. Simple on off signaling is spectrally inefficient, it required a dedicated pair in each direction and a cable could only support a limited number of digital circuits.
The advent of cheap large-scale integration means complex modulation schemes could be used. Current generation T-1 makes extensive use of DSP, much like DSL. It is more spectrally efficient, which is why modern T-1 only needs a single pair.
FCC regulations require Telcos to deliver T-1 over traditional two pair interface. However how signal is transported from customer to CO is not specified.
/tom |
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 49528867Premium
join:2010-04-16
Fort Lauderdale, FL
kudos:3 | said by tschmidt:FCC regulations require Telcos to deliver T-1 over traditional two pair interface. However how signal is transported from customer to CO is not specified. /tom Telco's do not hand off a T1 to the customer, the T in T1 implies transport, what is handed off to the customer is a two pair or four wire DS1 (digital signal level 1).
Wayne
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Certified Kwanon fanboy since 1971.  |
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tschmidtPremium,MVM
join:2000-11-12
Milford, NH
kudos:8 Reviews:
·G4 Communications
·Fairpoint Commun..
·Hollis Hosting
| said by 49528867:Telco's do not hand off a T1 to the customer, I understand that and you are correct. But it is common usage to call a 1.544mbps connection a T-1.
/tom |
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