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To: SteveG who wrote (7908)11/21/1997 8:39:00 AM
From: bill c.  Respond to of 21342
 
SteveG: >>Let's split it and say 1/3 of US copper have inductance coils that need to be removed. <<

This falls into the category of 70-80% of the lines that support ADSL. BA feels that they will serve ~90% with the DSC digital loop carrier system. Those customers over 18,000ft, which are usually on load coils are being placed onto DLC systems.

.. BA's deployment of Litespans is accelerating in areas where DSL deployment is concentrated initially. Litespans will be located remotely as well as in central offices. Bell Atlantic has a separate contract with DSC for the upgrade of outside plant copper plant to DLCs -- and this could be increased by this DSL action.

Importantly, the agreement calls for DSC to provide Bell Atlantic with the technology to overcome existing distance limitations of ADSL technology through the combined use of DLCs and RADSL. Currently, ADSL equipment will not work over DLCs which serve most loops more than two to three miles from a telephone company central office....


telechoice.com

>> And it DOESN'T include fixing bridge taps <<

Not all bridge taps have to be removed.

>> We could come up with some ballpark figure, suffice to say that ADSL deployment is DEFINITELY a significant dollar/effort committment and far from a plug and play technology. <<

For the RBOC's to compete with cable this has to be done on 1/3 of the lines, with a migration path toward FTTN. Longer loops with load coils are being replaced with fiber and DLC systems. DSC has 7 million lines serviced with it's DLC system and Lucent has 25 million lines. I'm not sure of the percentage of Lucent lines that are on the older SLC equipment which doesn't support ADSL. DLC systems where being installed well before ADSL came around. So the costs involved with running fiber and installing those DLC system can't all be charged against ADSL.... until later.