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Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it. DLCDLC is A Digital Loop Carrier. An SLC is an AT&T variety, 'lightspan' is another.. you may come across either or any of these terms when hearing why you cannot get DSL.
Beginning in the 80s, to save money (copper loops are relatively expensive), Telcos began to install DLC frames around their existing wire centers, particularly in fast growing districts to provide for the flood of new lines required.
These local concentrators, although digital, and fibre optic, were designed before DSL was really available, and do not support it. They do support ISDN, however. It is estimated that nationally around 20% of US telephone lines are served from a DLC (the percentages vary slightly depending on which Telco you are talking about). Furthermore, about half of those DLCs are of an old type that do not support DSL. The newer half are installed capable of supporting DSL, but are only just being enabled for that..
All is not lost if you are on on either type of concentrator, the older ones can be retro-fitted with newer cards that will bring them to a level of DSL compatibility, but as of the end of 1999, the process has hardly started!
In summary, there is one chance in 5 that you are on a DLC, and at present cannot get DSL.
For or an interesting document on the pros and cons of ADSL vs Fibre vs DLCs, check out Extending ADSL services to remote DLC locations tutorial.
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