That's a good diagram, and accurate. If you wanted to you could show the firewall between the BES and the Internet (port 3101 outbound only). Also, the NOC (RIM infrastructure) is not specific to each network - it's one relay for each territory (EU, NA and AP).
There is another variation, and that would be the database. You can run the database engine on the BES server but you can also run the BES database on a remote SQL server. So you could show an optional third hardware box connecting to the BES to reflect this in environments where clients wished to use a remote SQL server.
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