\definelayer [Kontaktdaten]
  [
    x=20mm,
    y=30mm,
    width=65mm,
    height=30mm,
    state=start
  ]

\setupbackgrounds [paper]
  [
    %setups=ALayer,
    % The setup ALayer is never defined
    background=Kontaktdaten,
    state=start
  ]

\starttext
\strut

\setlayerframed [Kontaktdaten]
  [
    background=color,
    backgroundcolor=lightgreen,
    width=10mm,
    height=130mm,
    frame=off,
    hoffset=-20mm,
    voffset=145mm,
    align=right
  ]{A}

\setlayerframed [Kontaktdaten]
  [
    background=color,
    backgroundcolor=darkgreen,
    width=10mm,
    height=60mm,
    frame=off,
    hoffset=-20mm,
    voffset=85mm,
    align=right
  ]{B}

\setlayerframed [Kontaktdaten]
  [
    background=color,
    backgroundcolor=lightgreen,
    width=60mm,
    height=175mm,
    frame=off,
    leftframe=on,
    framecolor=green,
    rulethickness=.5cm,
    hoffset=-10mm,
    voffset=100mm,
    align=right
  ]{%
\startlines
  Infobox:
  Peter
  New York
  0171/782801
  test@test.de
\stoplines}

\setlayerframed [Kontaktdaten]
  [
    width=30mm,
    height=40mm,
    %frame=\LayoutTest,
    frame=off,
    hoffset=-10mm,
    voffset=60mm,
    strut=no,
    %offset=overlay
  ]{%
  \externalfigure[cow][width=30mm,height=40mm]}

\page
\stoptext