Integration parameter
Integration parameters were crucial to the proper operation of a transporter. Without their proper calibration, transportation was impossible. 

When trying to rescue Cyrano Jones from Koloth in 2269, Montgomery Scott was temporarily unable to re-materialize the trader in the 's transporter room because the Klingon's phaser attack on Jones' ship had somehow "decalibrated the integration parameters". ()

See also  
 Integration matrix
Transporter technology