ronpin
Imagine Reality
join:2002-12-06
Nirvana
 ·AT&T Southwest
| DSL over Fiber I keep hearing that DSL over fiber doesn't work -- but how can that be true?
If I hookup a DSL modem WAN port (telco side) to a copper-to-fiber media converter -- the converter should faithfully recreate whatever signal is present on the copper -- even the 256 discrete multi-tones *analog* signal of VDSL. The receiving converter should faithfully recreate the 256 DMT signal at the other end. Am I missing something?
As long as the DSL signal "gets-to stay analog" -- what's the problem?
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ronpin
Imagine Reality
join:2002-12-06
Nirvana
·AT&T Southwest
1 edit | Re: DSL over Fiber Yes -- silly to place a DSL on fiber -- *BUT* -- that's what you'd be *forced* to do if you wanted to "retrofit" a fiber from your house -- to a FTTN node. Telco's want every customer served by the same interface -- no exceptions for those pesky FTTH resellers (who'd really prefer a straight OC12 backbone feed from the telco, no DSL)
So, I definitely see the sillyness -- but also the opportunity for FTTH -- in spite of DSL.
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dslwanter
Why would I want DSL? I have FTTH
Premium
join:2002-12-16
Lowellville, OH
 ·Armstrong Zoom In..
·AT&T Midwest
1 edit | Re: DSL over Fiber DSL isn't feasible over fiber, period. DSL is a radio signal that dies after 3 miles. If it was easy to repeat, telco's would be able to offer 6mbps DSL to their entire blueprint. The signal would be more reliable over fiber since fiber is virtually transparent to EMI unlike copper.
Verizon has the right idea, so do cable companies offering DOCSIS via FTTH in new areas. AT&T is on the wrong track and will still have to deal with "distance" issues. Why? Because they won't ditch xDSL technology.
If a company is going to spend the money to build a fiber network, they're going to look to save on ways to provide service and DSL wouldn't be a smart choice.
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ronpin
Imagine Reality
join:2002-12-06
Nirvana
·AT&T Southwest
| Re: DSL over Fiber said by dslwanter  :DSL isn't feasible over fiber, period. DSL is a radio signal Your cell phone antenna output would happily modulate a media converter (connected via coax). It is analog modulation with digital encoding -- and for VDSL it contains 256 "discreet multi-tones" (oh they're very discreet  ) I still see no technical reason -- but yes, apparently no telco will spend ~$200 per customer to extend a DS-1 line via media converters.
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