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VeEX MTTplus-522 OSP+ User Manual

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Summary of Contents for VeEX MTTplus-522 OSP+

  • Page 2: Table Of Contents

    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...
  • Page 3 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 MTTplus-522_OSP+_Test_Module Page 3 of 44...

  • Page 4: About This User Manual

    (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.

  • Page 5: Safety Information

    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.
  • Page 6 Wear ESD protection and grounding gear when: Inserting, extracting, or handling test modules. Connecting or disconnecting cables from modules or platform. Go back to top Go back to TOC MTTplus-522_OSP+_Test_Module Page 7 of 44...

  • Page 7: Introduction

    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...

  • Page 8: Physical Layer Testing

    CPE Emulation for ADSLx, VDSL2, and G.fast Go back to top Go back to TOC 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.
  • Page 9 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. MTTplus-522_OSP+_Test_Module Page 10 of 44...

  • Page 10: Basic Operations

    4.0 Basic Operation For information on Basic Operations, Home menu, Launching Test Applications, and other features specific to the MTTplus Host MTTplus Platform Manual. The following sections describe basic operations for the MTTplus-522 module. Chassis, refer to the 4.1 Touch-Screen Display The LCD supports touch-screen operation.

  • Page 11: Setup

    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. Go back to top Go back to TOC 5.1.1 DMM Capacitance Capacitance Loop Length Estimate...

  • Page 12: Dmm Resistance

    Go back to top Go back to TOC 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 Ω mode for measuring a circuit less than 10 kohms Use MΩ...

  • Page 13: Dmm Auto Test

    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. Go back to top Go back to TOC 5.2 TDR Fault identification and location...
  • Page 14 Open At Far End Short Bridge Tap Go back to top Go back to TOC MTTplus-522_OSP+_Test_Module Page 15 of 44...

  • Page 15: Time Domain Reflectometer (Tdr)

    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.

  • Page 16: Osp Expert

    Go back to top Go back to TOC 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.

  • Page 17: Longitudinal Balance

    Go back to top Go back to TOC 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...
  • Page 18 5.4.3 LOSS Go to section 5.6.1. Go back to top Go back to TOC 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 MTTplus-522_OSP+_Test_Module Page 19 of 44...
  • Page 19 Go back to top Go back to TOC 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.
  • Page 20 Go back to top Go back to TOC 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) >...
  • Page 21 Go back to top Go back to TOC MTTplus-522_OSP+_Test_Module Page 22 of 44...
  • Page 22 5.6 Far End Device (V-FED) V-FED is an optional Far End Device accessory for the MTTplus-522 module. Provides shorting function for RFL Signal transmission for Insertion Loss Battery operated V-FED requires a special RJ45 to multiple alligator clips test cable (P/N F02-00-100G) MTTplus-522_OSP+_Test_Module Page 23 of 44...

  • Page 23: Insertion Loss With V-Fed

    Pair 1: Blue Color Bands For Insertion Loss For RFL: used for Communication with MTTplus-522. Black Clip = Tip / A Blue Clip = Ring / B Pair 2: Red Color Bands Used for RFL Strap function, along with Green Clip. Black Clip = Tip / A Red Clip = Ring / B Ground: Green Clip...

  • Page 24: Rfl With V-Fed

    Basic Test Procedure: Make FED connections to the copper pair(s) under test and power on the V-FED. Make MTTplus-522 connection to the copper pair(s) under test. Enter Loss and press 'Start'. Use the arrow keys to scroll between the test points. 5.6.2 RFL with V-FED FED Connections for RFL Strap Function: Red Banded Test Clips + Ground Clip...

  • Page 25: Dsl/Gfast Overview

    MTTplus-522 V-FED Go back to top Go back to TOC 5.7 DSL/Gfast Overview ADSLx and VDSL2 technology uses the copper pair between the exchange or street cabinet and the customer premises. The usable bandwidth is extended from 4 kHz to 2.2 MHz in the case of ADSL2+ and up to 30 MHz for VDSL2. Extended bandwidths make the copper pair far more susceptible to faults, impairments and other degradation.

  • Page 26: Ansi

    The MTTplus-523 offers the following test functions: Emulates customer modem (XTU-R or G.Fast FTU-R) to prove that synchronization or link up with DSLAM / DPU is possible Provides key link performance statistics - measures downstream bit rate, upstream bit rate, max bit rate, relative capacity, signal to noise (SNR) margin, and attenuation among other measurements Carrier Tone statistics in both graphical and table format Error metrics and Events Table...

  • Page 27: Vdsl2

    ADSL2+ Frequency Spectrum Go back to top Go back to TOC 5.7.5 VDSL2 Frequency configuration options of 8.5 MHz, 12 MHz, 17.7 MHz, and 30 MHz are set automatically depending on DSLAM settings. Note: Impulse Noise Protection (INP) Electrical appliances and installations at customer premises often generate short bursts of noise of relatively high amplitude.
  • Page 28 Note: Annexes: Similar to ADSL and ADSL2+, VDSL2 includes regional bandplan annexes that specify PSD Masks which are designed to coexist with other services. Annex A specifies bandplans for the North American and enables VDSL2 to be deployed with traditional POTS telephony. Annex B specifies bandplans for Europe and and enables VDSL2 deployment with underlying POTS and ISDN services.

  • Page 29: G.fast

    5.7.6 G.fast G.fast is ideally suited for Fiber to the Distribution Point (FTTdp), where pure FTT deployment costs remain high. G.fast enables telecommunications service providers to stay competitive with cable operators, offering Gigabit+ services based on DOCSIS 3.x. G.fast highlights: Aggregate data rate targets of up to 1 Gbps for short copper loops, less than 300 meters.

  • Page 30: Line Status

    Setup tab Go back to top Go back to TOC 5.8.2 Line Status The current measurements displayed include the following: Rate (kbps): Downstream and Upstream rate Max (kbps): Maximum Downstream and Upstream rate Capacity (%): Ratio of the actual rate versus the maximum bit rate SNR Margin (dB): Signal to Noise Ratio margin Attenuation (dB): Difference in the power level transmitted at the near end and received at the far end Delay (ms): Interleave delay...
  • Page 31 Line Status G.fast Line Status G.Fast Mode lists the following key G.fast measurements: Net Data Rate (kbps): Current achieved data rate Expected Throughput Rate (kbps): The rate available in Showtime assuming full protection against an impulse noise environment Aggregate Rate: The sum of Downstream and Upstream rates SNR Margin (dB): Maximum dB increase in equalized noise or maximum dB decrease in equalized signal that a system can tolerate and maintain a BER of 1E-7 Start (ST) and duration time (ET), DSL synchronization status, ADSLx/VDSLx mode and profile, and estimated length are...

  • Page 32: Dsl Modem

    5.8.3 DSL Modem Status The DSL Modem Status icon indicates whether Showtime is in effect No Showtime Showtime status achieved Go back to top Go back to TOC 5.8.4 Errors Line and channel performance measurements include the following: CRC: Received CRC-8 code word does not match the code word transmitted. A count of the superframes that contained CRC.

  • Page 33: Tones

    Errors tab G.fast Near End Performance Counters G.fast mode displays the same errors as other ADSLx/VDSLx modes along with the followings near end performance counters: RTX-TX:Retransmitted frames may be sent to mitigate impulse noise in place of FEC or interleaving RTX-Uncorrected RTX Seamless Rate Adaptation (SRA) Fast Rate Adaptation (FRA)

  • Page 34: Bits Per Tone

    Bits per Tone Graph Zoom In/Zoom Out for Graphs The graph can display two different scales using Zoom In: The first scale displays all the tones on the same screen. Tap Zoom In to display a smaller range of tones on screen. Move the pointer past 127 to view tones 128-255 in one screen. Press Zoom Out to return to the original view displaying all the tones on the graph.
  • Page 35 ADSL, G.fast Comparison Specifications VDSL G.fast Full form Very high bit rate digital subscriber line Fast access to subscriber terminals Frequency Up to 30 MHz 2-106 MHz, 2-212 MHz (future) Maximum data rate 1 Gbps over distance of 70 meters 100 Mbps in both upstream and downstream 800 Mbps over distance of 100 meters (VDSL2)

  • Page 36: Snr Per Tone

    Interpreting the Results The lower frequency tones represent the bandwidth used for the upstream signal. The higher frequency tones at the right show the frequencies used for the downstream signal. The bits should drop to zero after the end of the upstream. This is the buffer between the upstream and downstream signals. The actual size of this buffer varies.

  • Page 37: Hlog

    Go back to top Go back to TOC 5.8.8 HLOG HLOG provides an attenuation vs carrier bin frequency graph. The frequency response curve can depict the presence of Bridge Taps, which can have a characteristic magnitude dip. A clean Hlog curve's slope will decline gradually and evenly. "Clean Line"...

  • Page 38: Quiet Line

    Go back to top Go back to TOC 5.8.9 Quiet Line QLN provides a quiet line noise vs. carrier bin Spectrum graph. This can help detect the presence of RF interference on the copper pair under test. Go back to top Go back to TOC 5.8.10 Events The Events tab displays a date and time log of events such as synchronization status and errors that occur during testing.

  • Page 39: Common Functions

    6.0 Common Functions For more information on the MTTplus platform common fuctions please refer to the MTTplus Platform Manual here. The following functions are common to all VeEX test sets: Tool Utilities Files Tools tab Tools tab Go back to top Go back to TOC...

  • Page 40: Warranty And Software

    Replace hardware which prove to be defective provided that the products that the customer elects to replace are returned to VeEX Inc. by the customer, along with Proof of Purchase, within thirty (30) days of the request by the customer, freight prepaid.

  • Page 41: Product Specification

    8.0 Product Specifications The most recent product specifications can be downloaded here from the VeEX website. Go back to top Go back to TOC MTTplus-522_OSP+_Test_Module Page 42 of 44...

  • Page 42: Certification And Declarations

    EU market after July 1, 2006 must pass RoHS compliance. For more information about RoHS as it relates to VeEX Inc, go to the VeEX web site at www.veexinc.com/RoHS. Go back to top Go back to TOC...

  • Page 43: About Veex

    With a blend of advanced technologies and vast technical expertise, VeEX’s products diligently address all stages of network deployment, maintenance, field service turn-up, and integrate service verification features across DSL, Fiber Optics, CATV/DOCSIS, Mobile backhaul and fronthaul (CPRI/OBSAI), next generation Transport Network, Fibre Channel, Carrier &...

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