Noun
telephone central where circuits are completed with patchcords
Source: WordNetDuring World War II, codebooks were only used each day to set up the rotors, their ring settings and the plugboard. Source: Internet
During the Spanish Civil War the Italian Navy used the K model of the commercial Enigma without a plugboard; this was solved by Knox in 1937. Source: Internet
For a message to be correctly encrypted and decrypted, both sender and receiver had to configure their Enigma in the same way; rotor selection and order, starting position and plugboard connections must be identical. Source: Internet
Current flowed from the battery (1) through a depressed bi-directional keyboard switch (2) to the plugboard (3). Source: Internet
Current flowed from the keyboard through the plugboard, and proceeded to the entry-rotor or Eintrittswalze. Source: Internet
Keys were easily changed by changing the rotor disks and the plugboard wires. Source: Internet