Jack in

The action of Jacking-in is when a net operator sends his or her Net Navi into the cyber world. In MegaMan Battle Networks 1, 2, and 3, the PET contained a wire that plugged into the jack of an electrical unit. From Megaman Battle Network 4 on, all Navis jacked in by wireless transport. To jack-in with MegaMan in the games, Lan would have to be standing considerable close to the jack-in port. The act of "Jacking-out" is the opposite operation.

When a navi is in the cyber world, their operators can disconnect without jacking them out but they cannot send battle chips to their navi without connection. Also, if a navi loses its connection with its operator, the navi can only jack-out by manually returning to the original jack-in site.

In MegaMan Battle Network 2, Lan receives a wireless port adapter before leaving to Netopia. Fortunately for him, he is able to attach it to two ports; one that became out of reach due to a trap and the other that was too far to reach without going near Princess Pride. The wireless allows MegaMan to jack-in through the wireless field. The wireless is essentially the predecessor to the wireless PET's introduced in MegaMan Battle Network 4.

In the Japanese version of both the game and anime, the phrase is "Plug-in..."

Notable Quotes
Most net operators call a sort of battle cry before jacking-in their navi by yelling out their navi's name.
 * Lan Hikari "Jack-in! MegaMan.EXE transmit" (MegaMan Battle Network)