analyzer monitors the BER test pattern input and
provides a metering display of bits received,
number of bits expected, and bit error rate
percentage.
Cipher - to convert information to a seemingly
random pattern for transmission or wireline
delivery in order to protect sensitive information.
Ciphered voice and data can only be understood by
means of a special key.
VSELP Modulation – Vector Sum Excited Linear
Predictive technique used in ASTRO radios and
test equipment to digitize analog signals before
transmission and to reconstruct analog signals on
the receiving end.
Decryption - process of converting cipher text to
plain text
Encryption - process of converting plain text to
cipher text
Key - a sequence of bits stored electronically in the
encryption and decryption modules. Once the key
has been loaded, it trains the internal
encryption/decryption circuits.
Key Inserter - a device used to load an electronic
encryption key into a radio or other device. Also
called a keyloader.
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