Viavi 8800SX Manual de usuario

8800SX Series

P25 Phase II Test

Option 05

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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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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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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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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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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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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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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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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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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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