Viavi CX300 ComXpert User manual

CX300 ComXpert
Communication Service Monitor
P25 Option Guide

VIAVI Solutions
1-844-GO-VIAVI
www.viavisolutions.com
CX300 ComXpert
Communication Service Monitor
P25 Option Guide
22146777 Rev.000

22146777 CX300 ComXpert P25 Option Guide Rev. 000
January 2022 i
Notice
Every effort was made to ensure that the information in this manual was accurate at the time of release.
However, information is subject to change without notice, and VIAVI reserves the right to provide an
addendum to this manual with information not available at the time that this manual was created.
Copyright/Trademarks
© Copyright 2022 VIAVI Solutions, Inc. All rights reserved. No part of this guide may be reproduced or
transmitted, electronically or otherwise, without written permission of the publisher. VIAVI Solutions and
the VIAVI logo are trademarks of VIAVI Solutions Inc. (“VIAVI”).
All other trademarks and registered trademarks are the property of their respective owners.
Patent Information
Patented as described at www.viavisolutions.com/patents
Copyright Release
Reproduction and distribution of this guide is authorized for US Government purposes only.
DFARS Statement
If software is for use in the performance of a U.S. Government prime contract or subcontract, software is
delivered and licensed as “Commercial Computer Software” as defined in DFAR 252.227-7014 (Feb
2014), or as a “Commercial Item” as defined in FAR 2.101(a) or as “Restricted Computer Software” as
defined in FAR 52.227-19 (Dec 2007) or any equivalent agency regulation or contract clause. Use,
duplication or disclosure of Software is subject to VIAVI Solutions' standard commercial license terms,
and non-DOD Departments and Agencies of the U.S. Government will receive no greater than Restricted
Rights as defined in FAR 52.227-19(c)(1-2) (Dec 2007). U.S. Government users will receive no greater
than Limited Rights as defined in FAR 52.227-14 (June 1987) or DFAR 252.227-7015 (b)(2) (November
1995), as applicable in any technical data.
Terms and conditions
Specifications, terms, and conditions are subject to change without notice. The provision of hardware,
services, and/or software are subject to VIAVI’s standard terms and conditions, available at
www.viavisolutions.com/en/terms-and-conditions.
Open Source Disclaimer - IMPORTANT READ CAREFULLY
The CX300 ComXpert Communications Service Monitor includes third party software licensed under the
terms of separate open source software licenses. By using this software you agree to comply with the
terms and conditions of the applicable open source software licenses. Software originated by VIAVI is not
subject to third party licenses. Terms of the VIAVI Software License different from applicable third party
licenses are offered by VIAVI alone.

Rev. 000 CX300 ComXpert P25 Option Guide 22146777
ii January 2022
Declaration of Conformity
VIAVI recommends keeping a copy of the Declaration of Conformity that shipped with the unit with the
test set at all times.
Warranty Information
Warranty information for this product is available on the VIAVI website at
https://www.viavisolutions.com/en-us/warranty-information.
Federal Communications Commission (FCC) Notice
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
This equipment was tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference, in which case you will be required to correct
the interference at your own expense.
The authority to operate this equipment is conditioned by the requirements that no modifications be made
to the equipment unless the changes or modifications are expressly approved by VIAVI.
ALERT
•To comply with FCC RF Exposure compliance requirements, a separation distance of at
least 20 cm must be maintained between the antenna of this device and all persons.
•This transmitter must not be co-located in conjunction with any other antenna or
transmitter.

22146777 CX300 ComXpert P25 Option Guide Rev. 000
January 2022 iii
Industry Canada Requirements
This device complies with Industry Canada's license-exempt RSSs. Operation is subject to the following
two conditions: 1) This device may not cause interference; and, 2) This device must accept any
interference, including interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts
de licence. L'exploitation est autorisée aux deux conditions suivantes: 1) l'appareil ne doit pas produire
de brouillage; et, 2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le
brouillage est susceptible d'en compromettre le fonctionnement.
EU WEEE and Battery Directives
This product, and the batteries used to power the product, should not be disposed of as unsorted
municipal waste and should be collected separately and disposed of according to your national
regulations.
VIAVI has established a take-back processes in compliance with the EU Waste Electrical and Electronic
Equipment (WEEE) Directive, 2012/19/EU, and the EU Battery Directive, 2006/66/EC.
Instructions for returning waste equipment and batteries to VIAVI can be found in the WEEE section of
VIAVI’s Standards and Policies web page.
If you have questions concerning disposal of your equipment or batteries, contact the VIAVI WEEE
Program Management team at WEEE.E[email protected].
EU REACH
Article 33 of EU REACH regulation (EC) No 1907/2006 requires article suppliers to provide information if
a listed Substances of Very High Concern (SVHC) is present in an article above a certain threshold.
For information on the presence of REACH SVHCs in VIAVI products, see the Hazardous Substance
Control section of VIAVI’s Standards and Policies web page.
EU CE Marking Directives (LV, EMC, RoHS, RE)
This product conforms with all applicable CE marking directives. Please see EU Declaration of
Conformity for details.
EMC Directive Compliance
This product was tested and conforms to the EMC Directive, 2014/30/EU for electromagnetic
compatibility.

Rev. 000 CX300 ComXpert P25 Option Guide 22146777
iv January 2022
California Proposition 65
California Proposition 65, officially known as the Safe Drinking Water and Toxic Enforcement Act of
1986, was enacted in November 1986 with the aim of protecting individuals in the state of California and
the state's drinking water and environment from excessive exposure to chemicals known to the state to
cause cancer, birth defects or other reproductive harm.
For the VIAVI position statement on the use of Proposition 65 chemicals in VIAVI products, see the
Hazardous Substance Control section of VIAVI’s Standards and Policies web page.
Korea Certification
Ordering information
This manual is a product of the VIAVI Technical Publications Department, issued for use with the CX300
ComXpert Communications Service Monitor. The PDF format of this manual is available on the VIAVI
product website.
Go to: https://www.viavisolutions.com/en-us/resources/literature-library
•Type CX300 to find the manuals associated with the CX300 ComXpert Communications Service
Monitor
Contact Information
Contact the Technical Assistance Center (TAC) for technical support or with any questions regarding this
or other VIAVI products.
•Phone: 1-844-GO-VIAVI
•Email: Tech[email protected]
For the latest TAC information, go to:
https://www.viavisolutions.com/support/technical-product-support
Class A Equipment (Industrial Broadcasting &
Communications Equipment).
This equipment is Industrial (Class A) electromagnetic wave suitability
equipment and seller or user should take notice of it, and this
equipment is to be used in the places except for home.

22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 ROR - i
Record of Revisions
RECORD OF REVISIONS
REV. DATE ACCEPTANCE
000 January 2022 VIAVI

Record of Revisions
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
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22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 Preface - i
Preface
This preface explains how to use this manual. Topics discussed include the following:
• About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
• Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
• Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv

Preface
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
Preface - ii January, 2022
About this Manual
Scope of Manual
This manual describes test and measurement functions associated with the CX300
ComXpert P25 Option. Refer to the CX300 ComXpert Communication Service Monitor
Operation Manual for information about test set operation, system settings, and Analog
test and measurement functions.
Intended Audience
This manual is intended for personnel who are familiar with P25 systems and operation of
the CX300 ComXpert Communication Service Monitor.
This manual is intended for novice, intermediate, and experienced users who want to use
the CX300 ComXpert P25 Option effectively and efficiently.
Related Information
This is the CX300 ComXpert P25 Option Guide. This manual is to be used in conjunction
with the following publications:
•CX300 ComXpert Quick Start Guide, 22130635, which provides basic operating
and safety information.
•CX300 ComXpert P25 Option Guide, 22146777, which provides information about
the test and measurement functions found in the CX300 P25 options.
•CX300 ComXpert Communication Service Monitor Operation Manual, 22130634,
which provides instructions to install, configure, and operate the CX300
ComXpert’s standard test and measurement functions
•CX300 Remote Programming Manual, 22146776, which defines the
Standard-Commands-for-Programmable-Instrument (SCPI) Consortium’s SCPI
standard and provides instructions for using this manual for various test and
measurements.
•CX300 Maintenance Manual, 22130636, provides basic instructions for
assembling the instrument components, setting up the CX300 Test Set,
instrument specifications, and instructions for removal, installation and calibration
procedures.

Preface
22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 Preface - iii
Typographical Conventions
This manual uses the following typographical conventions:
Table 1 Text formatting and other typographical conventions
Item(s) Example(s)
References to terms used to
identify key areas of the UI such
as screens, panes, menus, or
toolbars.
Navigate to the Date and Time screen.
Open the RF Receiver settings menu.
Some controls are also accessed from the Quick
Access Toolbar.
Hardware buttons, keys, or
switches that you press or flip.
Press the On button.
Flip the Power switch to the on position.
Software components such as
buttons, menus, tabs, or fields
on a PC-based or Web-based
user interface
Click Start.
Click File > Properties.
Type the name of the probe in the Probe Name
field.
Directory names, file names,
and code and output messages
that appear in a command line
interface or in some graphical
user interfaces (GUIs).
$NANGT_DATA_DIR/results (directory)
–test_products/users/defaultUs
er.xml (file name)
–All results okay. (output message)
Text you must type exactly as
shown into a command line
interface, text file, or a GUI text
field.
– Restart the applications on the server using the
following command:
$BASEDIR/startup/npiu_init restart
Type: a:\set.exe in the dialog box.
References to guides, books,
and other publications appear in
this typeface.
Refer to Newton’s Telecom Dictionary.
Required arguments (text
variables in code).
<password>

Preface
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
Preface - iv January, 2022
Contact Information
Contact the Technical Assistance Center (TAC) for technical support or with any questions
regarding this or another VIAVI products.
•Phone: 1-844-GO-VIAVI
•email: [e-mail]
For the latest TAC information, go to:
https://www.viavisolutions.com/en-us/services-and-support/support/technical-assistance.
Conventions
Symbols and Markings
The following conventions are found on the instrument and in product documentation:
Safety Definitions
This manual uses the following terms to indicate conditions or activities which are potential
safety hazards:
Table 2 Symbols and Markings
NOTE
This symbol indicates a note that includes important supplemental
information or tips related to the main text.
Attention Symbol
This symbol represents a general hazard. It may be associated with either a
DANGER, WARNING, CAUTION, or ALERT message. See Table 3 for more
information.
Table 3 Safety Definitions
Term Definition
CAUTION Identifies conditions or activities that, if ignored, can result in
equipment or property damage, e.g., Fire.
Mise en Garde Identifiez les conditions ou les activités qui, si ignorées, peuvent
entraîner des dommages à l’équipement ou aux biens, p. ex. un
incendie.

Table of Contents
22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 TOC - i
Table of Contents
Chapter 1 Introduction to the CX300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 CX300 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2 CX300 P25 Option Features and Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2.1 P25 Conventional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2.2 P25 CX300-DP25P2 option Phase 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3 Verifying P25 Option Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.1 Factory Installed Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.2 Post Production Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4 P25 Test Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4.1 Radio Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4.2 AutoTest Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.5 Accessing P25 Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.6 P25 User Interface Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Chapter 2 P25 Test and Measurement Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 P25 Generate and Receive Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.1 RF Generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.2 P25 Modulation Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.3 Analog Modulation Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.4 RF Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2 P25 Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.1 Meter Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.1.1 Meter Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.1.2 Lower Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.2.1.3 Upper Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.2 Meter Scale Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.2.1 Average Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.2.2 Refresh Meters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.2.3 P25 Demod Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.2.4 Analog Demod Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.2.5 RF Error Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.2.6 Signal Power Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.2.7 Modulation Fidelity Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.2.8 Symbol Deviation Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.9 Symbol Clock Error Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.10 Bit Error Rate Meter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.2.11 Channel Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.12 Constellation Plot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Table of Contents
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
TOC - ii January, 2022
2.2.13 Distribution Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.2.14 Eye Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3 Audio Controls and Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.4 Frequency List Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2.5 Normalize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Chapter 3 P25 Calls and Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Testing P25 Phase 1 Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.1 P25 Transceiver Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.2 Equipment Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.3 Hardware Setup Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4 Configuring the CX300 Test Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.1.5 Testing P25 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.1.6 Testing P25 Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2 P25 Receiver Sensitivity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.1 P25 Receiver Sensitivity Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.2 Equipment Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.2.3 Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.2.4 Configuring the CX300 Test Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.2.5 Performing the P25 Receiver Sensitivity Test . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Appendix A Terms and Acronyms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

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January, 2022 LOF - i
List of Figures
Figure Title Page
Figure 2-1 . . . Service Option Field Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 2-2 . . . Example of Constellation Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Figure 2-3 . . . Example Distribution Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Figure 2-4 . . . Example Eye Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Figure 3-1 . . . P25 Transceiver Test Setup Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 3-2 . . . P25 Receiver Sensitivity Test Setup Diagram . . . . . . . . . . . . . . . . . . . . 3-6

List of Figures
Final CX300 ComXpert P25 Option Guide 22146777 Rev.000
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22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 LOT - i
List of Tables
Table Title Page
Table 1 . . . . . Symbols and Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Table 2 . . . . . Safety Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Table 3 . . . . . Text formatting and other typographical conventions . . . . . . . . . . . . . . . . . . iv
Table 2-1 . . . . . P25 Modulation Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Table 2-2 . . . . . Screen Name Controls and Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Table 2-3 . . . . . Eye Diagram Controls and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Table 3-1 . . . . . Testing P25 Phase 1 Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

List of Tables
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
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22146777 Rev. 000 CX300 ComXpert P25 Option Guide Final
January, 2022 1 - 1
1
Chapter 1Introduction to the CX300
This chapter provides a general description of the CX300 P25 options. Topics discussed
in this chapter include the following:
• CX300 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• CX300 P25 Option Features and Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• P25 Conventional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• P25 CX300-DP25P2 option Phase 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• Verifying P25 Option Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
• Factory Installed Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
• Post Production Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
• P25 Test Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
• Radio Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
• AutoTest Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
• Accessing P25 Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
• P25 User Interface Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Chapter 1 Introduction to the CX300
CX300 Overview
Final CX300 ComXpert P25 Option Guide 22146777 Rev. 000
1 - 2 January, 2022
1.1 CX300 Overview
The CX300 ComXpert is a compact, bench-top communications test set for use in the Land
Mobile Radio or Two-Way Communications Industry. The CX300 is ideal for performing
preventative maintenance on two-way radios and their applicable support infrastructure.
Refer to the CX300 product brochure for a succinct overview of the unit, and to the CX300
Operation Manual for additional details.
The CX300 P25 software option provides various features for testing P25 radio systems.
1.2 CX300 P25 Option Features and Capabilities
This section highlights key features and capabilities of CX300 P25 software options.
1.2.1 P25 Conventional
P25 Conventional, option CX300-DP25P1, provides the following test features:
•Software identified as P25 Phase 1
•Ability to transmit P25 C4FM modulation waveforms
•Ability to receive, demodulate, and analyze P25 C4FM signals
•A variety of P25 and Analog meters for evaluating DUT transmit and receive
performance
•Constellation, Distribution, and Eye Diagram plots for P25 modulation analysis
1.2.2 P25 CX300-DP25P2 option Phase 2
The CX300 P25 Phase 2 protocol radios. It adds th ability to configure HCPM and
HDQPSK Phase 2 Modulation types. It requires option CX300-DP25P1.