Viavi ONX-220 User manual

ONX-220
User's Guide

ONX-220 User's Guide
22135173, Rev. 000 June 20202
Notice
Every effort was made to ensure that the information in this manual was accurate at the time
of printing. 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 2020 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”).
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.
and any use of such marks by VIAVI is under license.
All other trademarks and registered trademarks are the property of their respective owners.
Copyright release
Reproduction and distribution of this guide is authorized for US Government purposes only.
Ordering information
This guide is a product of the VIAVI Technical Publications Department, issued as part of the
product. You can obtain the manual through StrataSync. A printed quick start guide also ships
with the instrument and can be downloaded through StrataSync.
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 standard terms and conditions,
available at www.viavisolutions.com/en/terms-and-conditions.
Open Source Disclaimer - IMPORTANT READ CAREFULLY
The OneExpert CATV 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.

ONX-220 User's Guide
22135173, Rev. 000June 2020 3
Federal Communications Commission (FCC) Notice
This equipment has been 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 the user will be required to correct the interference
at his own expense.
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.
Any changes or modifications not expressly approved by VIAVI could void the user's authority
to operate the equipment.
CAUTION:
yThis equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. The End user must follow the specific operating instructions
for satisfying RF exposure compliance.
yThis transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
Industry Canada Requirements
This device complies with Industry Canada license-exempt RSS standard(s). 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.
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
Device operation in the band 5150–5250 MHz is only for indoor use.
Dans la bande de fréquence 5150-5250 Mhz, l’utilisation du produit doit être uniquement en
intérieur.

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22135173, Rev. 000 June 20204
Japan Radio Law
The GITEKI Mark can be found on the meter in the “System -> File Browser -> Documents”
folder.
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 process 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 the VIAVI Standards and Policies web page.
If you have questions concerning disposal of your equipment or batteries, contact the VIAVI
WEEE Program Management team at [e-mail].
EU REACH
Article 33 of EU REACH regulation (EC) No 1907/2006 requires article suppliers to provide
information if a listed Substance 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 the VIAVI Standards and Policies web page.
EU CE Marking Directives (LV, EMC, RoHS, RE)
This product conforms with all applicable CE marking directives. For details, please see the EU
Declaration of Conformity documentation included in the shipping package and available on
StrataSync.
China RoHS
China RoHS documentation is included in the shipping package and available on StrataSync.

ONX-220 User's Guide
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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 the VIAVI Standards and Policies web page.
Compliance with 2014/53/EU Radio Equipment Directive (RED)
In accordance with Article 10.8(a) and 10.8(b) of the RED, the OneExpert DSP instruments for
sale in the EU operates in the 5-205 MHz frequency range at a maximum RF transmit power of
+15dBm.
Please contact us for more information:
VIAVI Solutions
Network Service Enablement
6001 America Center Drive
San Jose, CA, 95002

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Precautions
WARNING:
The maximum “RF” input voltage to the meter is 125 Volts
(AC or DC). A larger voltage will damage the meter.
WARNING:
Pursuant to FCC 15.21 of the FCC rules, changes not
expressly approved by VIAVI might cause harmful
interference and void the FCC authorization to operate this
product.
WARNING:
The antenna used for this instrument is installed at the
VIAVI factory or by VIAVI-approved repair facilities. During
operation of the device, a distance of 20 cm or more should
be maintained between the antenna in this device and person.
To ensure compliance, do not operate at closer distances
than this. The antenna on the unit is located inside the device
at the top of the unit attached to the back plastic case. Do not
use any antenna other than the installed antenna.
CAUTION:
Do not use the instrument in any manner not recommended
by the manufacturer.
CAUTION:
A strong electromagnetic eld may affect the measurement
accuracy of the meter.

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Precautions (continued)
CAUTION:
Use only the battery charger supplied with the meter. Use of
any other charger may damage the battery.
NOTE:
All spent batteries should be disposed of according to local
laws and guidelines.

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Contents
About this Guide 19
Purpose and scope ................................................................................................ 19
Assumptions............................................................................................................ 19
Technical assistance............................................................................................... 19
Safety and compliance information .................................................................20
Conventions ............................................................................................................20
Typographical conventions..........................................................................20
Keyboard and menu conventions.............................................................. 21
Symbol conventions...................................................................................... 21
Symbol conventions (continued) ...............................................................22
Safety Definitions ..........................................................................................22
What ships with the ONX-220? .........................................................................23
Preparation for use................................................................................................23
Available models....................................................................................................23
Chapter 1 Quick Tour 25
About the ONX-220...............................................................................................26
Benefits.............................................................................................................26
Key features.....................................................................................................26
Connected ....................................................................................................... 27
Flexible and affordable ............................................................................... 27
Efficient ........................................................................................................... 27
A guided tour of the ONX-220...........................................................................28
Front view ........................................................................................................28
Bottom view....................................................................................................29
Status indicators.............................................................................................30
Touchscreen display.......................................................................................30
Softkeys............................................................................................................30
Back and Power buttons..............................................................................30

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Navigating the user interface .............................................................................31
Battery status and time ...............................................................................32
Expanding a menu.........................................................................................32
Selecting a menu option..............................................................................32
Using the tray menu .....................................................................................32
Entering data................................................................................................... 33
Personalizing the user interface ........................................................................33
Shortcuts ..........................................................................................................33
Rearranging icons...........................................................................................33
Chapter 2 Utilities 35
Accessing system utilities....................................................................................36
Displaying the System Settings menu .....................................................36
Displaying the Tray menu............................................................................ 37
Setting up your instrument ................................................................................38
Configuring international settings............................................................38
Setting the date and time ...........................................................................39
Set the time ..........................................................................................39
Set the date...........................................................................................39
Specify the date format.....................................................................39
Specify the time format.....................................................................39
Change the time zone ........................................................................39
Control Time Synchronization ..........................................................39
Changing screen and power settings ...................................................... 40
Set the backlight................................................................................. 40
Set the backlight timeout ................................................................ 40
Set the power off delay.................................................................... 40
Setting the volume........................................................................................ 41
Specifying the location for saved files..................................................... 41
Specifying user information........................................................................ 41
Restoring factory defaults ..................................................................................42
Establishing network connections....................................................................42
Enabling network connectivity..................................................................42
Establishing an Ethernet connection........................................................43
IPv4 Address Mode..............................................................................43
IPv6 Address Mode............................................................................. 44
IP Dual Stack Address Modes .......................................................... 44
Establishing an RF Connection ...................................................................45
Establishing a WiFi connection...................................................................45
Adding a WiFi network profile ...................................................................45
Connecting to a WiFi network................................................................... 46
Establishing a Bluetooth connection........................................................47
Enabling Bluetooth connectivity ...............................................................47
Connecting to a Bluetooth device.............................................................47
Updating the instrument’s firmware .............................................................. 48
Contents

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Download the firmware to a USB drive.................................................. 48
Updating the firmware from a USB drive ...............................................50
Updating the firmware from StrataSync..................................................51
Troubleshooting the Upgrade Process .....................................................52
No IP address .......................................................................................52
IP address of ONX or gateway starts with 192.168.0 .................53
Viewing hardware/software versions and options...............................53
Installing options ...........................................................................................54
Synchronizing to the StrataSync server ..........................................................55
To sync with StrataSync ...............................................................................55
Generating reports ........................................................................................ 57
Saving a report ............................................................................................... 57
Capturing a screen shot................................................................................58
To capture a screen shot ....................................................................58
To capture the tray menu or a popup menu ................................58
Viewing a report.............................................................................................58
Viewing your work orders...................................................................................59
Editing work orders.......................................................................................62
Saving a report to a work order.................................................................63
Work order notifications............................................................................. 64
Workflow settings ........................................................................................ 64
Managing files........................................................................................................65
Accessing the file browser...........................................................................65
Selecting files or folders...............................................................................65
Opening files or folders................................................................................65
Copying and pasting files or folders........................................................ 66
Uploading files using FTP/HTTP................................................................ 66
Managing files with StrataSync ...................................................................... 66
Viewing the User’s Guide on your instrument ..............................................67
Remotely operating the instrument ................................................................67
Setting up the ONX for VNC...................................................................... 68
Connecting to your ONX via VNC on your PC or Mobile Device ..... 69
Using a PC keyboard .....................................................................................70
VNC availability ..............................................................................................70
Ending a remote operation session...........................................................70
Browsing the web .................................................................................................71
Accessing the web browser .........................................................................71
Navigating the browser ...............................................................................71
Opening a web page .................................................................................... 72
Adding bookmarks ....................................................................................... 72
Exiting the browser ...................................................................................... 72
Contents

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Chapter 3 Menus and Workflow 73
Main Screen Selections ........................................................................................74
Testing Workflow...................................................................................................74
Choose Test......................................................................................................74
Choose test location......................................................................................74
Connect the Meter.........................................................................................74
Enter Work Order ........................................................................................... 75
To run a test assigned to a previously loaded Work Order ...... 75
To run a test at location and create a new Work Order ............ 75
Review Test Results...............................................................................................76
Dashboard........................................................................................................76
Drill Down..............................................................................................76
Pass/Fail Indication..............................................................................76
Channel View................................................................................................... 77
Measurement Pass/Fail Indication .................................................. 77
Chapter 4 CATV Testing 79
CATV Test Options ................................................................................................ 80
OneCheck ........................................................................................................ 80
To run a OneCheck Test...................................................................... 81
Cable Fault Finder and HL Leakage (optional) .............................82
Results.....................................................................................................82
Saving Results.......................................................................................82
Ingress Scan .....................................................................................................83
To run an Ingress Scan ........................................................................83
Results.....................................................................................................83
ChannelCheck................................................................................................. 84
To run a ChannelCheck ...................................................................... 84
Results.................................................................................................... 84
Saving results....................................................................................... 84
DOCSIS Check..................................................................................................85
To run a DOCSIS Check .......................................................................85
Results.....................................................................................................85
Saving results........................................................................................85
Spectrum ......................................................................................................... 86
To run a Spectrum test ...................................................................... 86
Results.................................................................................................... 86
Quick Check .....................................................................................................87
To run a Quick Check...........................................................................87
Results.................................................................................................... 88
Contents

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Cable Fault Finder (optional)...................................................................... 89
Drop Check ........................................................................................... 89
Cable Length ........................................................................................ 90
To run Cable Fault Finder .................................................................. 90
Results.................................................................................................... 90
HL Leakage (optional)................................................................................... 91
To run HL Leakage ............................................................................... 91
Results.....................................................................................................92
Additional notes for leakage monitoring in the home..............92
Chapter 5 Ethernet Testing 93
About Ethernet testing ....................................................................................... 94
Selecting Ethernet mode.................................................................................... 94
To select Ethernet mode ............................................................................. 94
Specifying Ethernet settings..............................................................................95
Loading a test profile..........................................................................95
Configuring a new Ethernet profile..................................................................95
Saving test profiles....................................................................................... 96
Connecting to the line......................................................................................... 96
Viewing results .............................................................................................. 96
Testing the data layer ..........................................................................................97
Chapter 6 Data Testing 99
About Data Tests ................................................................................................100
Ping and Traceroute testing (optional)..........................................................100
Speed Check testing (optional).........................................................................101
Apache server setup ....................................................................................101
Server scaling ...............................................................................................104
Server over-provisioning ..........................................................................104
Chapter 7 Fiber Testing 105
About the optical tools ......................................................................................106
Inspecting fiber....................................................................................................106
Measuring optical power ..................................................................................108
Chapter 8 WiFi Testing 109
About the WiFi tests (Plus and Pro models)..................................................110
Scanning for WiFi networks................................................................................111
Chapter 9 Configuring the OneExpert with StrataSync 113
Configuration Templates ....................................................................................114
Limit Plans ..............................................................................................................115
Limit Plan Configuration .............................................................................115
New Limit Plans.............................................................................................116
Limit Plan Configuration...................................................................116
Contents

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Viewing, Editing, Renaming, or Deleting a Limit Plan.............. 117
Saving Limit Plans...............................................................................117
Limit Plan Deployment................................................................................118
DOCSIS Service Plans...........................................................................................119
DOCSIS Service Plan Configuration..........................................................119
New DOCSIS Service Plans .........................................................................119
General Info.........................................................................................120
Data Limits............................................................................................121
VoIPCheck Limits................................................................................ 122
Viewing, Editing, Renaming, or Deleting a DOCSIS Plan ........ 123
Saving DOCSIS Service Plans .......................................................... 123
DOCSIS Service Plan Deployment ........................................................... 124
Off-Air Ingress Plans ........................................................................................... 125
Off-Air Ingress Plan Configuration ......................................................... 125
New Off-Air Ingress Plans.......................................................................... 125
Off-Air Ingress Band.......................................................................... 126
Viewing, Editing, Renaming, or Deleting an Off-Air Ingress
Plan........................................................................................................ 126
Saving Off-Air Ingress Plan ............................................................. 126
Off-Air Ingress Plan Deployment..............................................................127
Measurement Settings....................................................................................... 128
Measurement Settings Configuration.................................................... 128
New Measurement Settings ..................................................................... 128
OneCheck Settings ............................................................................ 129
Viewing, Editing, Renaming or Deleting a Measurement Plan ...
130
Saving Measurement Settings .......................................................130
Measurement Settings Deployment........................................................131
Limit Plan Exclusion Zones................................................................................ 132
Limit Plan Exclusion Zone Configuration............................................... 132
New Limit Plan Exclusion Zones .............................................................. 132
Limit Plan Exclusion Zone Configuration .................................... 133
Viewing, Editing, Renaming, or Deleting a Limit Plan Exclusion
Zone....................................................................................................... 133
Saving Limit Plan Exclusion Zones ................................................ 133
Limit Plan Exclusion Zone Deployment ................................................. 134
Tilt Settings........................................................................................................... 135
Tilt Settings Configuration........................................................................ 135
New Tilt Settings ......................................................................................... 135
Tilt Settings ......................................................................................... 136
Viewing, Editing, Renaming, or Deleting Tilt Settings ............ 136
Saving Tilt Settings ........................................................................... 136
Tilt Settings Deployment............................................................................137
Digital Measurement Settings ......................................................................... 138
Digital Measurement Settings Configuration...................................... 138
New Digital Measurement Settings........................................................ 138
Contents

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Digital Measurement Settings ....................................................... 139
Viewing, Editing, Renaming, or Digital Measurement
Settings ................................................................................................ 139
SavingDigital Measurement Settings .......................................... 139
Digital Measurement Settings Deployment.........................................140
Ingress Span ...........................................................................................................141
Ingress Span Configuration ........................................................................141
New Ingress Span..........................................................................................141
Ingress Span ........................................................................................ 142
Viewing, Editing, Renaming, or Deleting Ingress Span ........... 142
Saving Ingress Span .......................................................................... 142
Ingress Span Deployment.......................................................................... 143
Auto Purge.............................................................................................................144
Auto Purge Configuration..........................................................................144
New Auto Purge ...........................................................................................144
Auto Purge Settings.......................................................................... 145
Viewing, Editing, Renaming, or Deleting Auto Purge.............. 145
Saving Auto Purge............................................................................. 145
Auto Purge Deployment ............................................................................146
Channel Plan Template....................................................................................... 147
Channel Plan Template Configuration.................................................... 147
New Channel Plan Template ..................................................................... 147
Channel Plan Template Settings....................................................148
Viewing, Editing, Renaming, or Deleting a Channel Plan
Template...............................................................................................148
Saving Channel Plan Templates .....................................................148
Channel Plan Template Deployment.......................................................149
Throughput URL Settings..................................................................................150
Throughput URL Settings Configuration...............................................150
New Throughput URL Settings ................................................................150
Throughput URL Settings................................................................. 151
Viewing, Editing, Renaming, or Deleting Throughput URL
Settings ................................................................................................. 151
Saving Throughput URL Settings................................................... 151
Throughput URL Settings Deployment ................................................. 152
Chapter 10 Using the OneExpert with a Mobile Device 153
VIAVI Mobile Tech app........................................................................................ 154
Connecting to StrataSync.................................................................................. 154
Using the Mobile Tech app ............................................................................... 155
Logging in to StrataSync............................................................................ 155
Pairing the OneExpert to your mobile device...................................... 156
Mobile Tech Main Menu..............................................................................157
Connecting to your OneExpert via Remote Display .................................. 159
Updating the firmware from StrataSync ......................................................160
Contents

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Viewing hardware/software versions and options..............................161
Syncing to the StrataSync server .................................................................... 162
Syncing with StrataSync ............................................................................ 163
Managing files...................................................................................................... 165
Instrument Files............................................................................................ 165
Local Files ....................................................................................................... 167
Managing files with StrataSync .....................................................................169
Chapter 11 Test Results 171
OneCheck results ..................................................................................................172
Upstream Results..........................................................................................172
Downstream Details.....................................................................................173
System View........................................................................................ 174
MER ....................................................................................................... 174
BER......................................................................................................... 174
Off-Air Ingress .................................................................................... 174
DOCSIS Details...............................................................................................175
ChannelCheck results.......................................................................................... 176
QAM Channels............................................................................................... 176
OFDM Channels ............................................................................................ 176
Dashboard.......................................................................................................177
Channel View..................................................................................................177
QAM Channels .....................................................................................177
OFDM Channels.................................................................................. 178
Spectrum/IUC................................................................................................ 179
Level Over Time (optional) ........................................................................ 179
MER Over Time (optional) ......................................................................... 179
BER Over Time (optional)........................................................................... 179
DQI Over Time (optional)...........................................................................180
ICFR (In-Channel Frequency Response) (optional) ..............................180
Tilt ....................................................................................................................180
SmartScan (optional)...................................................................................180
Favorites ..........................................................................................................181
Constellation...................................................................................................181
Level Variation (OFDM) .............................................................................. 182
MER Variation (OFDM) ............................................................................... 182
Profile Analysis (OFDM).............................................................................. 182
DOCSISCheck results ............................................................................................. 183
QAM Channels............................................................................................... 183
OFDM Channels ............................................................................................ 183
Dashboard...................................................................................................... 183
Downstream ..................................................................................................184
Level Over Time (optional) ........................................................................184
MER Over Time (optional) .........................................................................184
BER Over Time (optional)........................................................................... 185
Contents

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Chapter Contents
DQI Over Time (optional)........................................................................... 185
Upstream........................................................................................................ 185
Transmit Over Time (optional).................................................................. 185
Upstream ICFR (optional)...........................................................................186
Upstream EQ Analysis.................................................................................186
Registration ...................................................................................................186
Throughput (optional) ................................................................................186
Ping/Traceroute (over DOCSIS) (optional)............................................. 187
Level Variation (OFDM) .............................................................................. 187
Profile Analysis (OFDM)..............................................................................188
MER Variation (OFDM) ...............................................................................188
Ingress Scan results .................................................................................................189
Changing the display .................................................................................189
Zooming..........................................................................................................189
Panning ..........................................................................................................189
Quick Check results ............................................................................................................................. 189
Cable Fault Finder results.....................................................................................190
Drop Check.....................................................................................................190
Cable Length..................................................................................................190
Changing the display ..................................................................................191
Zooming...........................................................................................................191
Panning ...........................................................................................................191
Changing Cable Type....................................................................................191
Moving the markers.....................................................................................191
Adding a second marker..............................................................................191
Stopping the test ......................................................................................... 192
StrataSync reports ....................................................................................... 192
HL Leakage results................................................................................................. 193
Equalizing the signal................................................................................... 193
Adjusting the volume and mute .............................................................. 193
StrataSync reports .......................................................................................194
Spectrum results..................................................................................................... 195
Moving the markers.................................................................................... 195
Adding a second marker............................................................................. 195
Changing the Display.................................................................................. 195
Changing RBW and AGC............................................................................. 195
Stopping the test ......................................................................................... 195
WiFi Scan results ..................................................................................................196
AP List ............................................................................................................196
List Data..........................................................................................................196
Choosing APs to graph ...............................................................................196
Channel Graph............................................................................................... 197
Time Graph..................................................................................................... 197

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Chapter Contents
Chapter 12 Appendix 199
Cleaning the instrument ...................................................................................200
Resolving problems ....................................................................................200
General testing ..................................................................................... 200
Data testing........................................................................................200
Limited warranty .................................................................................................201
Getting technical assistance .............................................................................201
Additional information.......................................................................................201
Specifications....................................................................................................... 202
Ordering information ........................................................................................ 206
Feature matrix ......................................................................................................207

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About this Guide
Thank you for purchasing the ONX-220. This guide provides setup and operating instructions
to get you up and running as soon as possible.
Purpose and scope
The purpose of this guide is to help you successfully use the product features and capabilities.
Additionally, this guide provides a complete description of the VIAVI warranty, services, and
repair information.
Assumptions
This guide is intended for novice, intermediate, and experienced users who want to use the
product effectively and efficiently. We are assuming that you have basic computer and mouse/
track ball experience and are familiar with basic telecommunication concepts and terminology.
Technical assistance
If you require technical assistance, call 1-844-GO-VIAVI / 1.844.468.4284.
Outside US: [phone]
Email: T[email protected]om
For the latest TAC information, visit
https://support.viavisolutions.com/welcome

ONX-220 User's Guide
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About this Guide
Safety and compliance information
Safety information is contained in a separate guide and is provided in printed format with the
product.
For information about CE compliance, see the Declaration of Conformity. A copy of the
declaration is included in the shipping package.
Conventions
This guide uses typographical and symbols conventions as described in the following tables.
Description Example
User interface actions On the Status bar, click Start.
Buttons or switches that you press
on a unit Press the ON switch.
Code and output messages All results okay
Text you must type exactly as
shown Type: a:\set.exe in the dialog box
Variables Type the new hostname.
Book references Refer to Newton’s Telecom Dictionary
A vertical bar | means “or”: only
one option can appear in a single
command.
platform [a|b|e]
Square brackets [ ] indicate an
optional argument. login [platform name]
Slanted brackets < > group
required arguments. <password>
Typographical conventions