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VeEX MTTplus-523, User Manual

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VeEX MTTplus-523 User Manual Download Page 19

bits. However, due to the face that a 

minimum of 2 bits

 (QAM-4) are encoded per bin, the SNR of any single bin 

cannot drop

below 6dB

.

Raw SNR per Tone

Go back to top

 

Go back to TOC

6.3.3 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" HLOG Graph with No Bridge Taps

Dips on Curve May Indicate Bridge Taps

MTTplus-523_e-manual, D07-00-117P RevA00

Summary of Contents for MTTplus-523

Page 1: ...MTTplus 523_e manual D07 00 117P RevA00 ...

Page 2: ...L to G fast 4 0 Basic Operations 4 1 Touch Screen Display 4 2 Battery 4 3 Connector Panel 5 0 DSL G fast Overview 6 0 DSL G fast Measurements 7 0 Common Functions 8 0 ReVeal Software 9 0 Warranty and Software 10 0 Product Specification 11 0 Certification and Declarations 12 0 About VeEX Go back to top MTTplus 523_e manual D07 00 117P RevA00 ...

Page 3: ...smitted 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 sol...

Page 4: ...cted 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 shall not go without recharging recon...

Page 5: ...ents Always store test modules in ESD protected packaging 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 523_e manual D07 00 117P RevA00 ...

Page 6: ...reater 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 premise further shortening the length of copper cabling VDSL2 and G fast are c...

Page 7: ...o back to top Go back to TOC 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 du...

Page 8: ...o 256 separate 4 3125kHz wide bins called sub carriers Even though each of these 256 sub carriers or tones can support a modulation of up to 15 bits the maximum achievable downstream data rate is actually 8 128 Mbit s due to error checking and related overhead data In the upstream direction a maximum of 30 sub carriers is used each tone being modulated with up to 15 bits providing a maximum theore...

Page 9: ...troduced a parameter called Impulse Noise Protection INP that allows operators to select the maximum impulse length that the DSL system can correct VDSL2 uses the same parameter and when implemented an INP value between 2 and 16 can correct errors from noise impulses ranging from 250µs to 3 75ms in length INP is a key feature in most IPTV video deployments and enables better Video QOS by minimizin...

Page 10: ...andard which has numerous configuration profiles and bandplans to meet regional service provider requirements The frequency bandwidth has increased from 12 MHz to 30 MHz with options for 8 5 MHz 12 MHz 17 7 MHz and 30 MHz spectrums The standard also defines asymmetric Plan 998 and symmetric PLan 997 bandplans for the transmission of upstream and downstream signals Profiles To simplify configuring ...

Page 11: ...n 300 meters Based on ITU T standards G 9700 and G 9701 Spectrum frequency range from 2 MHz to 106 MHz Tone spacing of 51 75 kHz 2048 maximum number of tones 12 Bits per Tone 212 MHz profile planned for the future for faster max rates Uses Time Division Duplexing TDD while traditional DSL uses Frequency Division Duplexing Enables flexible configuration of carriers shared by downstream and upstream...

Page 12: ...al to noise ratio 4 Exchange DSLAM sends the minimum signal to noise ratio and decides on the power output per tone 5 Showtime Initialization concludes in which the line is active and higher layer protocols such as ATM can begin negotiation to transfer data over the connection Showtime indicates that the port is working properly and synchronized The following measurements and parameters are displa...

Page 13: ...ignal 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 INP sym See the note on Impulse Noise Protection Depth fm Interleave depth Tx Power Transmitting power output is typically the level needed to achieve the noise margin configured in the DSLAM Mode Indicates the current test mode Line Status Line...

Page 14: ... 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 displayed in a separate table DSL Modem Status The DSL Modem Status icon indicates whether Showtime is in effect No Showtime Showtime status achieved...

Page 15: ...with no SES However these 10 seconds with no SES are excluded from unavailable time Retrain Press to resynchronize the modem Tap Reset to reset error counters On line Reconfiguration OLR During initial modem link up a signal to noise measurement is made for each tone and the bit distribution is optimized to deliver the desired bit rate During showtime modems constantly monitor the SNR tone On line...

Page 16: ...s aid the detection of copper faults that degrade DSL service quality Graphs and tables of carrier tone measurements are displayed in the Tones tab Select a tone measurement from the side panel to view Viewing Exact Measurements on a Graph Bits per Tone Graph To find the exact measurement on a graph such as bit count and frequency of a specific tone tap on the graph to move the marker to the exact...

Page 17: ...d on each bin on a good quality line Each tone bin represents a 4 3125 kHz bandwidth and is used to transfer up to 15 bits in a single direction In VDSL2 Bandplan 30a the tone bandwidth is increased to 8 625 kHz In contrast G fast has a tone spacing of 51 75 kHz and typical maximum of 12 bits per tone The usable spectrum for G fast is up to 106 MHz ADSL G fast Comparison Specifications VDSL G fast...

Page 18: ...e modem to transmit the provisioned rate This can be displayed as a graph or as a table During initial modem link up a signal to noise measurement is made for each tone and the bit distribution is optimized to deliver the desired bit rate During showtime modems constantly monitor the SNR tone and the bit distribution is adjusted to optimize bandwidth based on noise interference and cross talk If a...

Page 19: ... TOC 6 3 3 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 HLOG Graph with No Bridge Taps Dips on Curve May Indicate Bridge Taps MTTplus 523_e manual D07 00 117P RevA00 ...

Page 20: ...trum graph This can help detect the presence of RF interference on the copper pair under test QLN Go back to top Go back to TOC 6 3 5 Events The Events tab displays a date and time log of events such as synchronization status and errors that occur during testing Events MTTplus 523_e manual D07 00 117P RevA00 ...

Page 21: ...Go back to top Go back to TOC MTTplus 523_e manual D07 00 117P RevA00 ...

Page 22: ...7 0 Common Functions Tools tab The following functions are common to all VeEX test sets Tool Utilities Files Go back to top Go back to TOC MTTplus 523_e manual D07 00 117P RevA00 ...

Page 23: ...8 0 ReVeal Software For more information on using the ReVeal CX300 software refer to the user manual on the VeEX website Go back to top Go back to TOC MTTplus 523_e manual D07 00 117P RevA00 ...

Page 24: ...Inc by the customer along with proof of purchase within thirty 30 days of the request by the customer freight prepaid Additionally during the warranty period VeEX Inc will provide without charge to the customer all fixes patches and enhancements to the purchased software firmware and software options VeEX Inc does not warrant that all software or firmware defects will be corrected New enhancements...

Page 25: ...10 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 523_e manual D07 00 117P RevA00 ...

Page 26: ...nts of European Union and European Free Trade Association EFTA EN61010 1 Click here for CE Declaration of Conformity relating to VeEX products What is RoHS RoHS is the acronym for Restriction of Hazardous Substances Also known as Directive 2002 95 EC it originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products All applicable ...

Page 27: ...worldwide distribution channel provides uncompromised product support Visit us online at www veexinc com for latest updates and additional documentation VeEX Incorporated 2827 Lakeview Court Fremont CA 94538 USA Phone 1 510 651 0500 Fax 1 510 651 0505 Customer Care Phone 1 510 651 0505 Email customercare veexinc com Go back to top Go back to TOC MTTplus 523_e manual D07 00 117P RevA00 ...

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