 NetFixerFreedom is NOT freePremium
join:2004-06-24
The 'Boro
 ·Vonage
 ·Cingular Wireless
 ·Comcast
 ·AT&T Southeast
| AT&T "dry" DSL isn't really "dry" "Others spent considerable energy claiming it was technically impossible. Some execs insisted existing lines would oxidize and the network would fail should dry loop DSL be offered."
AT&T apparently still thinks that copper wire pairs need a dial tone to prevent decay. I have two "dry" DSL circuits, one from Covad and the other from AT&T/BellSouth. The Covad circuit is data only, but the AT&T circuit has a dial tone and is capable of making outgoing voice calls.
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We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.
Test your firewall. |
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| They put sealing current on the line for a good reason,to avoid galvanic corrosion of metallic (copper) pairs to keep from getting high Resistance open's and other troubles in splice module's.And yes over time you will have trouble in splice's that used dry module's. |
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 calvoiper
join:2003-03-31
Belvedere Tiburon, CA | I just can't buy this. For years (decades, really) the Bells just disconnected unused pairs--no dial tone, nothing. It's only been since the advent of (relatively) cheap electronic switches that they leave every pair connected and just electronically block the line.
calvoiper
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VoIP--the death knell of remaining voice monopolies! |
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cpal
join:2002-07-10
Herndon, VA | reply to jackoffjill
Explain then, how radio broadcasters for over 60 years used "dry pairs" for audio transmission from remote sites, as Studio-Transmitter links, etc. with low noise requirements that even DSL pairs don't have to meet. Or perhaps you are saying that after 10 years or so there might be a problem? I'd guess that would be about 5 years longer than the life of the average DSL line due to churn or just change in or upgrade to the broadband service. I believe the biggest problem in DSL lines, other than loading coils which must be removed if DSL is to work, are stubs--wires connected in parallel with existing cable pairs so that one pair from a CO can service more than one location (not at the same time) without a truck roll. At the frequencies used by DSL, those stubs can "tune" a loop and make it unusable until removed. The OP was correct: the database to track what were then called "special services" loops was pretty primitive compared to what was available for use with dial tone lines, but there were a lot of "dry pairs" in use way before DSL existed. |
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