Small tool to generate ladder diagrams for network protocols. obsoleted by mscgen.
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# define the entities in the system (in order)
ms "MS"
msc "MSC"
hlr "HLR"
gmsc "SMS GW-MSC"
smsc "SMSC"
# define the protocol messages in-order
smsc gmsc "NMSMS-EST-REQ (RP-DATA)"
gmsc hlr "MAP SRI SM req"
hlr gmsc "MAP SRI SM resp"
gmsc msc "MAP MT FORWARD SM req"
msc ms "Paging procedure via BSC/BTS" dashed
ms msc "Establish Connection via BTS/BSC" dashed
msc ms "Authentication / Ciperhing" dashed both
ms msc "CP-ACK for previous CP-DATA"
ms msc "CP-DATA (RP-ACK)"
msc gmsc "MAP MT FORWARD SMS resp"
msc ms "CP-ACK for previous CP-DATA"
gmsc smsc "NMSMS-DATA-IND (RP-DATA)"