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msc {
hscale=3;
te [label="TE"], nt [label="NT"], an [label="AN"], le [label="LE"], l23 [label="L23"];
--- [label="LE initiated activation of ISDN user port"];
le <= l23 [label="MPH-AR\nActivate Request"];
an <= le [label="FE101\nActivate access"];
te <=> an [label="Activation procedure"];
an => le [label="FE104\nAccess activated"];
le => l23 [label="MPH-AI\nActivate Indication"];
...;
te => an [label="UL LAPDm frames"];
an => le [label="Enveloped UL LAPDm frames"];
le => l23 [label="UL LAPDm frames"];
le <= l23 [label="DL LAPDm frames"];
an <= le [label="Enveloped DL LAPDm frames"];
te <= an [label="DL LAPDm frames"];
}
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