System integrity
In telecommunications, the term system integrity has the following meanings: 

 That condition of a system wherein its mandated operational and technical parameters are within the prescribed limits.  
 The quality of an AIS when it performs its intended function in an unimpaired manner, free from deliberate or inadvertent unauthorized manipulation of the system. 
 The state that exists when there is complete assurance that under all conditions an IT system is based on the logical correctness and reliability of the operating system, the logical completeness of the hardware and software that implement the protection mechanisms, and data integrity.

References
 
 National Information Systems Security Glossary

Telecommunications systems
Technology systems
Systems engineering
Computer security
Reliability engineering