General Dynamics R2600 Series, Operator'S Manual, Page: 203 / 402

Section 11
SECURENET OPTION INTRODUCTION
11-1 INTRODUCTION
This manual contains information for using the
R2670 FDMA Digital Communications System
Analyzer with SECURENET Options. The
SECURENET Option provides unique testing
features for communications equipment using
SECURENET encoding and modulation
principles. Standard R2670 capabilities are
retained. The additional SECURENET test
sequences are accessed via the LCD display,
screen-defined softkeys, numeric keypad, cursor
movement keys, and optical tuning knob. The
SECURENET Option functions may also be
accessed via the remote control interface port.
11-2 CAPABILITIES
The SECURENET Option gives the R2670 the
capability of monitoring and generating
SECURENET signals. A SECURENET signal
relates to a Motorola proprietary signaling
scheme in which a 12 kbps serial bit stream is
mapped into one of two corresponding
amplitudes, filtered digitally, and then modulated
onto an RF carrier. Most of the SECURENET
user interface operates exactly like that of the
standard R2670. Several new features were
added to test the unique requirements of user
SECURENET equipment.
Voice Mode System Testing
Voice mode provides SECURENET-
compatible modulation and demodulation with
vocoding. The SECURENET Option generate
and monitor modes support actual functional
voice testing in encrypted mode using either a
test key or an operating key loaded from a
separate compatible keyloader.
Bit Error Rate (BER) Testing
A BER test pattern can be selected to modulate
the R2670 generator section. A BER test
pattern can likewise be decoded by the R2670
in monitor mode. BER tests can also be
conducted in duplex mode for loop testing.
Dedicated Test Screens
Dedicated test screens can be setup as a start-up
default condition or as a programmable test set-
up. Dedicated SECURENET test screens are
zoned with RF and Audio Modulation control
screens to simultaneously display test results
along with their test conditions.
Baseband Audio Scope Display
The display provides a graphic image of the
audio baseband signal. This baseband signal is
selectable at either the vocoder input in
generate mode or the vocoder output in monitor
mode.
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