M2259-00-200-812 T2000 Radio Encryption 47
Copyright TEL Encrypted Radio Programming and Service Manual
5 T2000 Radio Encryption
T2000 radios can be encryption-enabled in the field using the T2000 Encryption Upgrade Kit
(IPN T2000-EA-001) and the appropriate Transcrypt or Midian Encryption Module.
This kit comprises a flex circuit which brings all connections required for encryption to a single
connector for plug-in encryption functionality. This is the Tait standard encryption interface.
Instructions for fitting the flex are on page 65 of this manual.
Note: Ensure the encryption module to be fitted has been configured for the T2000 radio. See
the module manufacturer’s service manual for more information.
This is a hardware-only addition to the radio. It offers:
user control of Encryption state – On or Off – by the Aux key (or a Function key
programmed as Aux)
encryption state indicated by lighting the Green LED on the Aux (or a Function) key.
5.1 Circuit Operation
The diagram below shows the encryption circuit operation for both a T2000 encrypted radio and
a T2000 radio as a programming radio.
Note: When using a T2000 radio as a programming radio, an encryption module should not
be fitted.
Connecting an encryption module automatically diverts the audio through the module. No link
setting changes are required if a module is removed.
Transmit and receive audio is intercepted by the flex from the Scrambler/Vox connector, across
R673 and R638. Audio passes through the encryption module and is encrypted or not, according
to the user-selected encrypt state.
The module Mode input is driven from the Aux signal from the radio micro. When the radio is
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