Try to Google the following:

adsl sdsl ldds glossary

quote:
DSL Digital Subscriber Line
ADSL Asymmetric DSL
BDSL Broadband DSL
CDSL Consumer DSL [Rockwell]
FDSL Fixed Directory Subscriber List
HDSL High-Bit-Rate DSL +
High-Data-Rate DSL
IDSL Integrated Services Digital Network DSL
RDSL Rate-Adaptive DSL
SDSL Single-Line DSL +
Symmetric DSL
VDSL Very-High-Bit-Rate DSL
VADSL Very-High-Rate Asymmetric DSL
VDSL Very-High-Data-Rate DSL
LDDS Long Distance Discount Services (company)NOT!
LDDS Limited Distance Data Set YES!
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.