Summation check

In telecommunication, the term summation check (sum check) has the following meanings:

• A check based on the formation of the sum of the digits of a numeral.
  • Note: The sum of the individual digits is usually compared with a previously computed value.
• A comparison of checksums on the same data on different occasions or on different representations of the data in order to verify data integrity.

Source: from Federal Standard 1037C