Viavi 8800SX Manuale utente
8800SX Series
P25 Phase II Test
Option 05
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX P25 Phase 2 Operation
•The P25 Phase 2 Option 05 allows transmitter and receiver testing of both subscriber portable and mobile
radios as well as base stations.
•Testing is generally performed using OEM software to put the radio into a “Test Mode” to control the radio
or base station for various transmit patterns and receiver BER measurements.
Note: The 8800SX does not support Phase II Trunking.
Introduction
•Phase II Trunking uses a Phase 1 Control Channel
–Maintains compatibility
•Phase II Voice channels use HCPM and HDQPSK modulation
for uplink and downlink
•Phase II Subscriber TX/RX
–Transmits HCPM Modulation
–Receives HDQPSK
•Phase II Base Station TX/RX
–Transmits HDQPSK
–Receives HCPM
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX P25 Phase 2 Operation
Switching Systems to P25 Phase 2
To access this system –
1. Press the Home Button
2. Select Configuration by pressing
LMR
3. Select Advanced Digital
Note: The 8800SX will reboot and come up
into the Phase II system after making this
selection. Repeat this process choosing LMR
to return to the LMR system after Phase II
testing is complete.
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2
3
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© 2018 VIAVI Solutions Inc.
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8800SX P25 Phase 2 Operation
•3 Modulation/Demodulation Types
•C4FM
•HDQPSK
•HCPM
•Measurements
•Symbol Deviation and Modulation Fidelity
•Symbol Clock Error
•Frequency Error
•Signal Power
•Bit Error Rate
•FM Deviation Meter
•Graphics
•Digital Plots: Constellation, Eye Diagram, and Distribution
•Power Profile: HCPM Timeslot Burst
Summary of Capabilities
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
•From the Generators Menu
•Generator
•Modulation
•From the Receivers Menu
•Receiver
•Digital
•From theAnalyzers Menu
•Digital Plots
•Power Profile (for H-CPM only)
•Power Profile can be stacked on top of
the Digital Plots Tile.
•Use the “Fast Stack” Icon to select
the hidden tile.
Window Selections
Initial Settings
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
HDQPSK Loopback - What you should see when testing a base station
With the generator enabled, and the input and
output ports routed to TR, it is possible to test
or view the various modulation types prior to
testing a radio or base station.
1. Set the Demod Type to HDQPSK
2. Set the Modulation Type to HDQPSK
3. Set the Modulation Pattern to 1031
4. Pressing the Cycle Button on the Digital
Plots Tile will allow viewing of the Eye
Diagram and Constellation Plots in addition
to the Distribution Plot. Note: Power Profile
Plots are not valid for HDQPSK
Modulation.
HDQPSK Modulation has a Symbol Deviation
of 2250 Hz and should be within 10% of that
value or ±225 Hz.
HDQPSK Modulation
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
HCPM Loopback – What you should see when testing a subscriber radio
With the generator enabled, and the input and
output ports routed to TR, it is possible to test or
view the various modulation types prior to
testing a radio or base station.
1. Set the Demod Type to HCPM
2. Set the Modulation Type to HCPM
3. Set the Modulation Pattern to 1031
4. Set the Modulation Mode to Free Run for
loopback operation. To test a transmitter
this setting must be changed to SYNC.
5. Pressing the Cycle Button on the Digital
Plots Tile will allow viewing of the Eye
Diagram and Constellation Plots in addition
to the Distribution Plot. Note: Power Profile
Plots are not valid for HDQPSK
Modulation.
HCPM Modulation has a Symbol Deviation of
3000 Hz and should be within 10% of that value
or ±300 Hz.
HCPM Modulation
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
Setup for testing a base station
To test a base station:
1. Enter the transmitter frequency on the
8800SX Receiver Tile.
2. Enter the receiver frequency on the
Generator Tile.
3. Set the 8800SX Output Port to ANT.
4. Set the 8800SX Input Port to TR.
5. Connect the 8800SX ANT to the base
station RX Input.
6. Connect the 8800SX TR Port to the base
station TX Output.
7. Set the 8800SX receiver demod to
HDQPSK.
8. Set the 8800SX modulation to HCPM.
9. Set the 8800SX modulation pattern to 1031
and change the mode from Free Run to
SYNC and enable the RF Generator.
10. Power measurements for Phase II signals
should be made with the Signal Power
Meter after it has been calibrated with the
Norm Button.
When testing base stations, the 8800SX is able to
synchronize to the outbound signal and transmit in
either logical channel 0 or 1.
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
Setup for testing a subscriber radio
To test a subscriber radio:
1. Enter the transmitter frequency on the
8800SX Receiver Tile.
2. Enter the radio receiver frequency on the
8800SX Generator Tile.
3. Set the 8800SX Output Port to TR.
4. Set the 8800SX Input Port to TR.
5. Connect the 8800SX TR Port to the
subscriber radio antenna port.
6. Set the 8800SX receiver demod to HCPM.
7. Set the 8800SX modulation to HDQPSK.
8. Set the 8800SX modulation pattern to 1031.
When testing subscribers, the 8800SX can not only
measure the important modulation parameters, but
also display the profile of burst and verify that it is
within the parameters specified in TIA-102-CCAB.
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© 2018 VIAVI Solutions Inc.
viavisolutions.com
8800SX Screen Setup for P25 Phase 2
Testing a subscriber transmitter
To test a subscriber radio:
1. With OEM software, configure the radio to
transmit a Phase II 1031 pattern.
2. Set the 8800SX RF Generator Enable to
Off.
3. Key the radio with the OEM software.
4. The Power Profile Ramp should be within
the pre-defined mask. A green indicator light
indicates that the signal is within the mask.
Note: Power measurements for Phase II signals
should be made with the Signal Power Meter
after it has been calibrated with the Norm
Button.
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