Section 19
PROJECT 25 INTRODUCTION
19-1 INTRODUCTION
This manual contains information regarding the
R2670 Project 25 features. Project 25 provides
unique testing features for communications
equipment using Project 25 encoding and
modulation principles. The additional Project 25
test capabilities are accessed via the LCD display,
screen-defined softkeys, numeric keypad, cursor
movement keys, and optical tuning knob. Some
of the Project 25 functions may also be accessed
via the remote control interface port.
19-2 CAPABILITIES
The Project 25 feature set gives the R2670 the
capability of monitoring and generating Project
25 signals. A Project 25 signal relates to the
Association of Public-Safety Communications
Officials International (APCO) Project 25 digital
standard Common Air Interface (CAI) signaling
scheme in which a serial bit stream is encoded,
mapped into one of four corresponding
amplitudes, filtered digitally, and then modulated
onto an RF carrier.
NOTE
Trunking operation is described in section 23.
Voice Mode System Testing
Voice mode provides Project 25-compatible
modulation and demodulation with Improved
Multi-Band Excitation (IMBE) vocoding. The
Project 25 Option generate and monitor modes
support actual functional voice testing in both
the unencrypted and encrypted modes. In the
encrypted mode, either a test key or an operator
key loaded from a separate compatible
keyloader can be used.
Bit Error Rate (BER) Testing
A BER test pattern can be selected to modulate
the R2670 generator for BER testing. A 1011
Hz Tone Test pattern can likewise be decoded
by the R2670 in monitor mode and a BER
computed from a comparison with a stored
version of the expected pattern.
Dedicated Test Screens
Dedicated Project 25 test screens are zoned
with RF and Modulation control screens to
simultaneously display test results along with
their test conditions. Dedicated test screens
can be set up as a start-up default condition or
as a programmable test set-up.
Clear Scope Display
The display provides a graphic image of the
audio clear signal. This clear signal is
selectable at either the vocoder input in
generate mode or the vocoder output in
monitor mode.
19-3 PROJECT 25 CONNECTORS
The R2670 has two connectors as shown in
Figure 19-1. Both connectors are located on the
side of the housing. The KVL connector provides
a receptacle for loading an external encryption
key. The other connector is an interface port.
253
Summary of Contents for R2600 Series
Page 8: ...3 7 1 3 AC DC Voltmeter 41 3 7 1 4 INT DIST EXT DIST Meter 43 v...
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Page 66: ...DISPLAY ZONE RF ZONE AUDIO ZONE Figure 3 1 Screen Zone Arrangement 20...
Page 68: ...Figure 3 2 System Help 22...
Page 83: ...Figure 3 11 General Sequence Mode Select 37...
Page 85: ...39 Figure 3 12 RF Display Zone...
Page 88: ...Figure 3 14 Digital Voltmeter Screens 42...
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Page 205: ...Figure 11 1 R 2670 with SECURENET Option Housing 159...
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Page 218: ...Figure 13 8 Test Key Programming Display Figure 13 9 External Key Programming Display 172...
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Page 267: ...Figure 17 7 Encryption Select Display Figure 17 7 Encryption Select Display 221 221...
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Page 291: ...Figure 18 1 Radio BER Test Mode Audio Zone Figure 18 2 Radio BER Test Mode BER Meter 245...
Page 293: ...Figure 18 4 Receive BER 247...
Page 298: ...Figure 18 6 ASTRO CLEAR SCOPE Display of Output Modulation 252...
Page 304: ...Figure 21 1 PROJ 25 Version Screen Figure 21 2 PROJ 25 Options Screen 258...
Page 309: ...Figure 21 6 SET UP Display Screen Figure 21 7 Encryption Select Display 263...
Page 335: ...Figure 22 4 PROJ 25 CONV CLEAR SCOPE Display of Output Modulation 289...
Page 339: ...Figure 24 1 PROJ 25 Version Screen Figure 24 2 PROJ 25 Options Screen 293...
Page 354: ...Figure 25 3 Encryption Select Display Figure 25 4 Algorithm Select Display 308...
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