docs/manuals/user/old/pon-requirements/reference-internal.svg

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  <title>blockdiag</title>
  <desc>blockdiag {

    //orientation = portrait;

    // Blocks used
    SDN [label = "SDN\nController", width = 64];
    M [label = "PON\nManager", width = 64];
    V [label = "Voltha\nCore &amp; NBI", width = 74];
    A [label = "OLT\nAdapter", width = 64];
    A2 [label = "ONU\nAdapter", width = 64];
    U [label = "Upstream\nNetwork", width = 64];
    L2 [label = "L2 Aggr.", width = 64, shape = cloud];
    OL [label = "OLT chip\n&amp; firmware", width = 64];
    ON [label = ONU, width = 64];
    R [label = RG, width = 64];

    U &lt;-&gt; L2 [label = Pd];
    L2 &lt;-&gt; OL [label = Pu];
    OL &lt;-&gt; ON;
    ON &lt;-&gt; R [label = Pr];
    M &lt;-&gt; V;
    M &lt;-&gt; SDN;
    SDN &lt;-&gt; V [label = Pv];
    V &lt;-&gt; A [label = Pa];
    V &lt;-&gt; A2;
    A &lt;-&gt; OL [label = Pc];

    group {
        SDN; M; V; A; A2; U; L2; OL; ON; R;
        shape = line;
        color = "#FFFFFF";
        fontsize = 24;

        group {
            label = "PON Network";
            V; A; A2; OL; ON;

            group {
                label = "Voltha";
                color = "#AAAAFF"
                V; A; A2;
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  <text fill="rgb(0,0,0)" font-family="sans-serif" font-size="11" font-style="normal" font-weight="normal" text-anchor="middle" textLength="58" x="618" y="72">&amp; firmware</text>
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  <text fill="rgb(0,0,0)" font-family="sans-serif" font-size="11" font-style="normal" font-weight="normal" text-anchor="middle" textLength="24" x="96" y="58">PON</text>
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