How Spotlight SQL Server determining Packets Error Rate Alarm and how the rate is calculated. (4285941)

Spotlight on SQL Server Enterprise obtains the values from SQL Server using:
Counter:           sys.dm_os_performance_counters
Reference:         http://technet.microsoft.com/en-us/library/ms187743.aspx

A packet is declared incorrect if at least one bit is erroneous. 
See below Wikipedia link for more information.

Spotlight on SQL Server Enterprise calculates our rate as follows:
Spotlight on SQL Server Enterprise do 2 collections and take the difference between them (second collection - first collection) and divide by the time difference.

Here are a few links to information about bit and packet error rates, etc.
http://technet.microsoft.com/en-us/library/ms190343.aspx
http://whatis.techtarget.com/definition/bit-error-rate-BER
http://en.wikipedia.org/wiki/Bit_error_rate