Phaser cannon

Phaser cannon is a type of phaser bank used by at least the Federation and Species 6339. It has been utilized as a ground vehicle mounted and a starship mounted weapon.

Ship-mounted phaser cannon
The shipmounted Federation cannon is an optronically targeted phaser. It was presumably first introduced in the Defiant starship. In the mirror universe the Defiant phaser cannons were called multi-targeting phaser banks by the Klingons.

''The use of the name "phaser cannon" here comes from the computer screen in "Live Fast and Prosper". It was used along with the cut-away graphic, that first appeared in the Star Trek: Deep Space Nine Technical Manual.

The four cannons of the Defiant-class have been seen usually firing phaser bolts simultaneously in short rapid fire bursts and in only one direction. The cannons can also fire beams. The combined firepower of the four phaser cannons of the Defiant appears to be almost as powerful as the combined firepower of two wing-mounted disruptor cannons on a Klingon Bird-of-Prey.