Jamming signal
A jamming signal or jamming frequency was a transmission capable of disrupting various ship's systems, including communications, sensors, and transporters.

In 2152, the crew of a Mazarite ship that was pursuing  utilized a jamming signal to disrupt the Starfleet vessel's communications and sensors, thereby preventing the Enterprise crew from requesting assistance from a Vulcan ship. Ambassador V'Las, whom the Enterprise crew was attempting to safely transport back to the Vulcans, suggested transmitting on a little-used diplomatic frequency, which she suspected the Mazarites were unaware of. In order to conceal the approach of the Vulcan ship, Lieutenant Reed, Enterprises tactical officer, was able to deflect the Mazarites' jamming signal, disrupting their sensors as well. The plan was successful, and the Vulcan combat cruiser Sh'Raan was able to come to the Enterprises assistance, driving the Mazarites off. ()

In 2374, The Doctor, EMH of the , managed to remodulate one of Seven of Nine's Borg implants to emit a jamming signal, successfully disabling a neural interface with which she and the rest of the Voyager crew had been outfitted by a Hirogen boarding party. This allowed Seven to subsequently disable Captain Janeway's interface, who then deactivated the interfaces of the entire crew, allowing them to retake Voyager from the Hirogen. ()

The high-energy drill utilized by the Romulan mining vessel Narada generated a jamming signal as a side-effect of its operation. In the alternate reality created by Nero's temporal incursion, this required a team from the  to space jump from a shuttlecraft to the drilling platform in 2258 in order to manually disable the drill, allowing the Enterprise to re-establish transporter control and mount a rescue mission to . ()

In 2263 of the same alternate reality, just before the Battle of Altamid, Krall's swarm drones seemed to jam Enterprises communications, which  alerted the rest of the command crew to. However, this was not intentional; these were VHF radio signals which the drones were using to communicate, which Enterprises former crew exploited during Krall's final assault on the Federation. ()

de: Störsignal
Communications technology