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-rw-r--r--2021/osmodevcall-v5/isdn-control.msc19
1 files changed, 19 insertions, 0 deletions
diff --git a/2021/osmodevcall-v5/isdn-control.msc b/2021/osmodevcall-v5/isdn-control.msc
new file mode 100644
index 0000000..0b89b85
--- /dev/null
+++ b/2021/osmodevcall-v5/isdn-control.msc
@@ -0,0 +1,19 @@
+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"];
+}
personal git repositories of Harald Welte. Your mileage may vary