0-9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z xDSL A generic (the letter "x" means generic) term for a digital subscriber line (DSL) equipments and services, including ADSL, HDSL, IDSL, SDSL, and VDSL.