documentclass[crop,tikz]{standalone}


usepackage{tikz}
usetikzlibrary{shapes,arrows}
usetikzlibrary{positioning}

usetikzlibrary{arrows,
    chains,
    decorations.markings,
    shadows, shapes.arrows,shapes, fit}

begin{document}
tikzset{%
sum/.style      = {draw, circle, node distance = 2cm}, % Adder
input/.style    = {coordinate}, % Input
output/.style   = {coordinate}, % Output
block/.style = { draw,
              thick,
              rectangle,
              minimum height = 2em,
              fill=white,
              align=center
},
wide block/.style = {
              block,
              minimum height = 3em,
              text width=2.5cm,
              minimum width = 8em,
},
dotted_block/.style={draw=black!20!white, line width=1pt, dash pattern=on 1pt off 4pt on 6pt off 4pt,
            inner sep=6mm, rectangle, rounded corners}
}
newcommand{suma}{Large$+$}

begin{tikzpicture}[auto, thick, node distance=2cm, >=triangle 45]
draw
node at (0,0){}
node [input, name=input1] {}
node [align=center, wide block, right = 1cm of input1] (inte2) {IEEE1}
node [align=center, wide block, right = 1cm of inte2] (inte3) {IEEE2}
node [align=center, wide block, right = 1cm of inte3] (inte4) {IEEE3}
node [sum, right = 1cm of inte4] (suma1) {suma}
node [input, name=input2, above = 1cm of suma1] {}
node [output, name=output1, right = 1cm of suma1] {};
node [align=center, wide block, right = 0.5cm of output1] (glamor) {glamor};
node[wide block, right = 15mm of glamor] (trainer) {trainer};
node[block, below=10mm of glamor](M){giga};
node[block, below=10mm of trainer](L){mn};
node [dotted_block, fit = (inte2) (inte3)] (aa) {};
node [dotted_block, fit = (inte4) (suma1)] (aa2) {};
node [dotted_block, fit = (glamor) (trainer) (L) (M)] (aa3) {};

node at (aa.north) [above, inner sep=3mm] {T1};
node at (aa2.north) [above, inner sep=3mm] {T2};
node at (aa3.north) [above, inner sep=3mm] {T3};

draw[->](input1) -- node {kmm}(inte2);
draw[->](inte2) -- node {kdd}(inte3);
draw[->](inte3) -- node {dx}(inte4);
draw[->](inte4) -- node {msg}(suma1);
draw[->](input2) -- node {taco} (suma1);
draw[<-](glamor.west) --node[above]{$y$} ++(-1.5,0);
draw[->](glamor) -- node {dol} (trainer);
draw[->](trainer.east) -- node[name=y]{kmm} ++ (2,0);
draw[->,rounded corners](trainer.east) -- ++(1,0) |- (L);
draw[->](L)--(M);
draw[<-, rounded corners]([yshift=1mm]glamor.south west)
       -- ++(-1,0) |- (M.west);
end{tikzpicture}
end{document}