Yes it is available to query. In inventory look under Network Adapters - Network Adapter. UNder here you are likely to see more than one entry as each card gets an entry. You could use query to find adapters where Active=Yes or even Link Status=Connected. In here you also have a data rate field. You might want to filter donw further using connector type so that you don't include wireless devices.
MarXtar Ltd/MarXtar Corporation
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Update - New Stand-Alone State Notifier Console for Service Desk Operators
Update - State Notifier now detects machine and user Idle states
Update - WoW & State Notifier now integrate for even more functionality