What is Network Load in terms Tb/s?

Hi Friends!,
Usually the network load can be measured in the unit of Erlang.
But, what is the real meaning of network load in terms of Tb/s (Terabit/sec)?
Could anyone have answer for this?

I believe if you choose to set date/time automatically ( system prefs/date & Time) using a network time server, this option allows you to connect to it if you have your firewall on.
Drew
iMac G5 2.1 1.5GB RAM , iBook , iPod 5G   Mac OS X (10.4.5)  

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