SQL Server/T-SQL Tutorial/System Settings/PACK RECEIVED

@@PACK_RECEIVED Returns the total input packets read from the network since the SQL Server instance was last

started. You can monitor whether the number increments or stays the same, thus surmising if there is a network 
availability issue.
3>
4> SELECT "PackReceived", @@PACK_RECEIVED
5> GO
------------ -----------
PackReceived        6457
(1 rows affected)