Components, controls and connectors.
a. COMSEC Device TSEC/KY-57. The KY-57 is a scrambler-descrambler. It is the base
component of the Vinson system. It has the capacity for storing and utilizing six different TEKs.
(1) Audio connector. The audio connector is used to connect the handset to the KY-57 when
using AN/PRC-77 or AN/VRC-12 series radio sets. With SINCGARS, secure communications are
possibly with the handset connected to the audio connector on the RT in manpack or mounting adapter
in vehicular configurations. The SINCGARS interconnect cable provides connection of audio from the
RT to the KY-57.
(2) Fill connector. The fill connector is used to connect the KY-57 to the fill device using
the fill cable. This connection must be made whenever a TEK is to be loaded into the KY-57.
(3) Radio connector. This connector is used to connect the KY-57 to the radio to carry
signals from the radio to the KY-57. This includes audio and control signals.
(4) FILL switch. The fill switch is used to select the position which has the TEK stored or is
to receive the TEK during loading.