VeEX MTTplus-522 OSP+ User manual
Table of Contents
1.0 About this User Manual
2.0 Safety Information
3.0 Introduction
3.1 Evolution of Residential DSL to G.fast
3.2 Physical Layer Testing
4.0 Basic Operations
4.1 Touch-Screen Display
4.2 Battery
4.3 Connector Panel
5.0 Setup
5.1 DMM Multimeter
5.1.1 DMM Capacitance
5.1.2 DMM Resistance
5.1.3 DMM Auto Test
5.1.4 Recommended DMM Measurements
5.1.5 Ground Resistance
5.2 TDR
5.2.1 Time Domain Reflectometer (TDR)
5.3 RFL (Resistance Fault Locator)
5.4 OSP Expert
5.4.1 Impulse Noise
5.4.2 Longitudinal Balance
5.4.3 LOSS
5.4.4 PDS Noise
5.5 POTS (VF)
5.5.1 NOISE
5.5.2 Ringers
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5.5.3 Longitudinal Balance
5.6 V-FED (Far End Device)
5.6.1 Insertion Loss with V-FED
5.6.2 RFL with V-FED
5.6.3 Basic Test Procedure
5.7 DSL/G.fast Overview
5.7.1 ANSI
5.7.2 DMT
5.7.3 ADSL2
5.7.4 ADSL2+
5.7.5 VDSL2
5.7.6 G.fast
5.8 DSL/G.fast Measurements
5.8.1 Setup
5.8.2 Line Status
5.8.3 DSL Modem
5.8.4 Errors
5.8.5 Tones
5.8.6 Bits per Tone
5.8.7 SNR per Tone
5.8.8 HLOG
5.8.9 Quiet Line
5.8.10 Events
6.0 Common Functions
7.0 Warranty and Software
8.0 Product Specification
9.0 Certification and Declarations
10.0 About VeEX
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1.0 About This User Manual
This user manual is suitable for novice, intermediate, and experienced users and is intended to help you successfully use the
features and capabilities of the different modules for test platforms. It is assumed that you have basic computer experience and
skills, and are familiar with IP and telecommunication concepts, terminology, and safety.
Every effort was made to ensure that the information contained in this manual is accurate. However, information is subject to change
without notice. We accept no responsibility for any errors or omissions. In case of discrepancy, the web version takes precedence
over any printed literature.
(c) Copyright 2019 VeEX Inc. All rights reserved. VeEX, VePAL are registered trademarks of VeEX Inc. and/or its affiliates in the
USA and certain other countries. All trademarks or registered trademarks are the property of their respective companies. No part of
this document may be reproduced or transmitted electronically or otherwise without written permission from VeEX Inc.
This device uses software either developed by VeEX Inc. or licensed by VeEX Inc. from third parties. The software is confidential
and proprietary of VeEX Inc. The software is protected by copyright and contains trade secrets of VeEX Inc. or VeEX's licensors.
The purchaser of this device agrees that it has received a license solely to use the software as embedded in the device, and the
purchaser is prohibited from copying, reverse engineering, decompiling, or disassembling the software.
For more technical resources, visit the VeEX Inc. web site at www.veexinc.com. For assistance or questions related to the use of
this product, call or e-mail our customer care department for customer support. Before contacting our customer care department,
have the product serial number and software version ready. Please locate the serial number on the back of the chassis. Please
provide this number when contacting VeEX customer service.
Customer Care:
Phone: + 1 510 651 0500
E-mail: [email protected]
Website: www.veexinc.com
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2.0 Safety Information
Safety precautions should be observed during all phases of operation of this instrument. The instrument has been designed to
ensure safe operation however please observe all safety markings and instructions. Do not operate the instrument in the presence
of flammable gases or fumes or any other combustible environment. VeEX Inc. assumes no liability for the customer's failure to
comply with safety precautions and requirements.
Lithium-ion Battery Precautions
Lithium-ion (Li-ion) battery packs are compact and offer high capacity and autonomy, which make them ideal for demanding
applications, like providing long lasting power to portable test equipment. For safety reasons, due to their high energy concentration,
these battery packs and products containing them must be used, charged, handled, and stored properly, according to the
manufacturer’s recommendations.
Li-ion battery packs contain individual Li-ion cells as well as battery monitoring and protection circuitry, sealed in their plastic
container that must not be disassembled or serviced.
The test set unit's battery pack is also fitted with a safety connector to prevent accidental short circuits and reverse polarity.
Always charge the unit's battery pack inside the test platform battery bay using the AC/DC adapter supplied by VeEX.
Do not charge or use the battery pack if any mechanical damage is suspected (shock, impact, puncture, crack, etc).
Do not continue charging the battery if it does not recharge within the expected charging time
Storage: For long term storage, the battery pack should be stored at 20°C/68°F (room temperature), charged to about 30 to
50% of its capacity. Spare battery packs should be charged and used at least once a year to prevent over-discharge (rotate
them regularly).
It is recommended to charge and use battery packs at least every three months. Battery packs must not go without
recharging (reconditioning) for more than six months.
After extended storage, battery packs may reach a deep discharge state or enter into sleep mode. For safety reasons, Li-ion
batteries in deep discharge state may limit the initial charging current (pre-recharge) before starting their regular fast charging
cycle. The pre-charging state may take several hours.
Air transportation of Li-ion batteries is regulated by United Nations' International Air Transportation Association (IATA)
Dangerous Goods Regulations and by country-specific regulations. Please check local regulations and with common carriers
before shipping Li-ion battery packs or products containing relatively large Li-ion battery packs.
Electrical Connectors
Telephone lines may carry dangerous voltages. Always connect the electrical test ports to known test interfaces which carry low
level signals.
ESD: Electrostatic Discharge Sensitive Equipment
Test modules could be affected by electrostatic discharge. To minimize the risk of damage when
replacing or handling test modules, make sure to follow proper ESD procedures and dissipate any
electrostatic charge from your body and tools and remove the use proper grounding gear.
Perform all work at a workplace that is protected against electrostatic build-up and discharging.
Never touch any exposed contacts, printed circuit boards or electronic components.
Always store test modules in ESD protected packaging.
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3.0 Introduction
MTTplus-522
The MTTplus-522 Outside Plant (OSP)+ Expert Module combines key copper verification features with DSL/G.fast modem
emulation. It is designed for Service Providers deploying broadband services over a DSL or G.fast access network.
Platform Highlights
Modern, modular test platform with a growing range of available test modules covering legacy and modern Access (copper
and fiber), FTTx, Metro, Carrier Ethernet and Transport technologies
Test set connectivity via USB, Ethernet, WiFi, and Cellular
Fast and efficient test results transfer to USB memory stick
Built-in GPS option
Built-in camera option for job site documentation, QR, and bar code
Small package and lightweight
Field replaceable battery pack
Large LCD touch screen and ambient light sensor
WiFi Wiz with InSSIDer SSID Analysis
Fiber Optic Tools USB accessories support: Digital Fiber Inspection Scope and Optical Power Meter
3.1 Evolution of Residential DSL to G.fast
As DSL technology continues to improve, the copper wire length from a broadband provider's distribution point to the customer
premises has decreased, providing even greater speeds to customers.
ADSL relied solely on existing copper telephone wire infrastructure, connecting from the Digital Subscriber Line Access Multiplexer
(DSLAM) at the provider's central office to reach customer premises. With VDSL, fiber from the CO is deployed to a DSLAM at an
optical node (FTTN) closer to the customer premises, further shortening the length of copper cabling. VDSL2 and G.fast are capable
of closing the distance from a distribution point (FTTdp) to a few hundred meters of the end subscriber. G.fast supports speeds of
150 Mbps to 1 Gbps depending on the distance from the distribution point.
DSL Network Types
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CPE Emulation for ADSLx, VDSL2, and G.fast
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3.2 Physical Layer Testing
Time Domain Reflectometer (TDR); up to 2 lines simultaneously
Locate cable faults.
Determine distance to a open, short, load coil, and bridge tap.
Resistance Fault Locator (RFL)
Detect and find ground, cross battery and shorts.
Capacitance Meter; with Ring, Tip, and Ground results
Estimate loop length.
Determine capacitive cable balance.
Resistance Meter; with Ring, Tip, and Ground results
Verify insulation resistance.
Detect the presence of shorts.
DC Volt Meter; with Ring, Tip, and Ground results.
Verify proper POTS line power.
Detect foreign DC voltage.
AC Volt Meter; with Ring, Tip, and Ground results
Detect Foreign AC induced voltage T/G, R/G, T/R, from adjacent power lines.
DC Current Meter; with Ring to Tip results
Verify POTS DC Loop current.
Frequency Response/Attenuation Measurement
Determine loss characteristics for the entire VDSL/ADSL band.
PSD Background Noise Measurement
Measure ambient noise.
Longitudinal Balance
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Checks whether the cable pair has adequate balance for crosstalk immunity.
VF Noise Measurement:
Metallic Noise measures the background noise on a cable pair.
Power Influence measures the noise from sources such as power.
Balance is derived from Metallic Noise minus Power Influence.
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4.0 Basic Operation
For information on Basic Operations, Home menu, Launching Test Applications, and other features specific to the MTTplus Host
Chassis, refer to the MTTplus Platform Manual. The following sections describe basic operations for the MTTplus-522 module.
4.1 Touch-Screen Display
The LCD supports touch-screen operation. To operate the touch-screen, use the stylus located in the top cover to navigate the
menus and tabs. Please observe the following precautions:
Never use excessive pressure on the touch-screen as this may damage its functionality.
Never use sharp objects such as a pen, screwdriver etc. as this may damage the surface.
Clean the surface of the touch screen using a soft cloth and mild detergent only. Do not use alcohol.
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4.2 Battery
The MTTplus chassis is equipped with an intelligent Li-ion rechargeable battery pack which is located in the rear of the unit. The
battery will be partially charged upon delivery, so it is recommended to charge the battery fully before use. Please charge the battery
at room temperature to preserve its life and to obtain maximum charge. The battery is charged during operation provided the unit is
connected to the AC Mains using the supplied AC adapter. Removing the battery, while the unit is powered on is not recommended -
this may result in damage. Charge the battery by connecting the AC Main adapter to the power jack on the left side.
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4.3 Connector Panel
The MTTplus-522 module supports:
RJ11 LINE interface for G.fast and DSL
RJ45 Ethernet Port, for DSL to PC Pass Through mode
TIP/A, RING/B, GND/E 2mm Mini Banana
Connector Panel
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5.0 Setup
5.1 DMM Mulitmeter
Cable Balance
Loop length estimates
Ensure proper insulation / resistance between Tip (A) - Ring (B) - Ground (E)
Fault identification, such as a short or foreign battery
To get started, select the desired mode, then the desired leg (e.g. Tip-Ring) or All, which will measure all three legs.
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5.1.1 DMM Capacitance
Capacitance Loop Length Estimate
Based on Capacitance Tip-Ring value; requires an Open circuit at the far end of the line.
Capacitance Balance
Ratio of: (Capacitance Tip-Ground) / (Capacitance Ring-Ground), displayed as a percentage from 1.0% to 100.0%
Pass Threshold is typically ≥95%.
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5.1.2 DMM Resistance
Insulation Resistance should be ≥3.5 MΩ
Loop Resistance / Length Estimate: based on Resistance Tip-Ring value, with a hard short at the far end of the line.
Use Ωmode for measuring a circuit less than 10 kohms
Use MΩmode for measuring Insulation Resistance or 'Leakage'
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5.1.3 DMM Auto Test
Auto Test: quickly steps through major DMM tests automatically
5.1.4 Recommended DMM Measurements
5.1.5 Ground Resistance
A special mode that measures the resistance between the ground at the CO/Exchange and the ground at the test set location.
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5.2 TDR
Fault identification and location
Impedance mismatch detection
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5.2.1 Time Domain Reflectometer (TDR)
Range: a drop down menu to set the approximate footage range
Cable: Select the Type of Cable being tested to configure the appropriate Vp value.
Vp%: manually set the Velocity of Propagation
Gain: in units of dB, can be adjusted to magnify small events
Start/Stop: Manually Start and Stop the TDR
One/Two: One Pair Trace or Two Pair Traces
MFL/AFL: select between Manual Fault Locator (MFL) or Automatic Fault Locator (AFL), which tries to find the first fault event.
1 or 2 Markers: activate a second marker for determining Delta distance between two events.
M1/M2 Locked/Unlocked: use to lock a Marker position
Meters/Feet: choose the appropriate measurement unit.
Left and Right Arrows: for Marker control.
Impedance: Impedance mismatch detection.
If using MFL, Manual Fault Locate Mode, first select the appropriate Distance Range, then press Start.
The test set automatically selects the appropriate pulse width setting for the selected distance range.
When using Two Pair Mode, you can select between Split Mode or Over Mode.
- Split Mode presents two separate TDR traces, with Trace One at the top half of the screen and Trace Two at the bottom half of the
screen.
- Overlay Mode superimposes the two traces into a single presentation, which can be used for troubleshooting a problem pair against a
known good pair.
5.3 RFL
The Resistance Fault Locator can determine the distance to faults not detectable by a TDR
Requires a shorting strap or Far End Device at the far end
Proper connections to the pair(s) under test is critical for the RFL measurement to be done properly. Follow the graphical setup guide
for both near end connections and far end shorting Strap connections. You can select between One Pair or Two Pair.
Two Pair should only be used if you have access to at least two known good conductors.
Once ready, press Start to begin the measurement.
For tips on running RFL with V-FED device at the far end, refer to section 5.6.2.,
The test set also supports a 'Euro RFL' mode, which is for customers based in Europe, and uses a different connection setup.
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5.4 OSP Expert (Optional Features)
5.4.1 Impulse Noise
To access Impulse Noise go to OPS Expert > Impulse Noise.
Detect impulse noise spikes on the signal and keep a running count of the number of impulse events over time. Impulse noise is defined
as a random pulse whose amplitude is much higher than that of background noise.
Impulse noise is transient, short duration noise, which can cause transmission errors
Difficult to detect with a Spectrum Analyzer
Presented as Impulse Noise Event Counter and Graph
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5.4.2 Longitudinal Balance
To access Longitudinal Balace go to OSP Expert > Longitudinal Balance.
Cable Balance is critical for crosstalk immunity
Interference is a common-mode (longitudinal) signal
When the degree of unbalance with respect to earth ground (Capacitive and Resistive) is significant: a normal-mode
crosstalk signal arises
Longitudinal Balance is another measurement technique used to quantify the degree of cable unbalance
Transmit a common mode test signal [along the shield of the cable] and measure the resultant differential signal [across
Tip (A) and Ring (B)], reported in units of dB.
Voiceband Longitudinal Balance typical Pass Limit is > 60 dB
Wideband Longitudinal Balance typical Pass Limit is > 38 dB
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5.4.3 LOSS
Go to section 5.6.1.
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5.4.4 PSD
To access PSD go to OSP Expert > PSD 8MHz and PSD 35 MHz.
PSD Field Spectrum Analyzer – Wideband Background Noise Measurement
Measure induced crosstalk from in-service neighboring cable pairs, or external noise
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5.5 POTS (VF) (Optional Features)
5.5.1 Noise
To access Noise go to POTS (VF) > Noise.
When this measurement is selected, a message screen will appear prompting you to connect TIP1, RING1 and the Ground test leads.
1. Noise: Measure the background noise on a cable pair. To preform this measurement, there must be a quiet termination or open
at the end of the cable pair. It is measured in dBrn (decibels relative to noise). dBrn=dBm+90. First press 'Noise (V) then
'Measure'.
2. Power Influence: is noise to ground measurement that measures noise from sources such as induced AC voltage from power
utility lines. It is displayed in the Power Influence box. First press 'Power Infl.' then 'Measure'.
3. Balance: Displays CALC. BALANCE. This is the difference between Power Influence and Metallic Noise. After obtaining
measurements for Noise and Power Influence, press 'Balance', then press 'Measure'.
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5.5.2 Ringers
The Ringers function measures the capacitance associated with one or more ringer circuits on the line. One old style mechanical ringer
has a capacitance of 0.47 μF. Newer phones have electronic ringers that have much lower capacitance than 0.47 μF.
To access Ringers go to POTS (VF) > Ringers menu. To measure, press the desired leg.
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5.5.3 Longitudinal Balance
To access Longitudinal Balance go to POTS (VF) > Longitudinal Balance.
Cable Balance is critical for crosstalk immunity
Interference is a common-mode (longitudinal) signal
When the degree of unbalance with respect to earth ground (Capacitive and Resistive) is significant: a normal-mode
crosstalk signal arises
Longitudinal Balance is another measurement technique used to quantify the degree of cable unbalance
Transmit a common mode test signal [along the shield of the cable] and measure the resultant differential signal [across
Tip (A) and Ring (B)], reported in units of dB.
Voiceband Longitudinal Balance typical Pass Limit is > 60 dB
Wideband Longitudinal Balance typical Pass Limit is > 38 dB
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