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Coherent interference

- CSO/CTB, spurs or ingress produce symbol clusters with a hole in the center so they appear as "donuts". This can also be a result of laser

clipping or sweep interference.

Coherent Interference

Phase noise

- Also known as Phase jitter in a QAM signal, it is caused by transponders in the transmission path or by the I/Q modulator. Phase jitter is a statistical

quantity that affects the I and Q path equally. Phase noise causes the symbol clusters to appear as arcs, particularly those near the edges of the constellation. Phase

noise can also result from faulty headend up/down converters.

Phase Noise

CX350 e-Manual D07-00-037 RevC01

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Содержание VePal CX350

Страница 1: ...CX350 e Manual D07 00 037 RevC01 Page 1 of 81...

Страница 2: ...Utility Ports 5 0 Home Screen and Menu 5 1 Screen Layout 5 2 Screen Icons 6 0 Setup 6 1 Channel Tables and Locations 6 1 1 Channel Tables 6 1 2 Locations 6 1 3 Test Point Compensation 7 0 Test Applic...

Страница 3: ...ons 7 8 3 Remote Operations 7 8 4 R Server 7 8 5 RP Balancing 7 8 6 TDR 7 8 7 DS1 7 8 8 OFDM 8 0 Tools 8 1 IP Tools 8 1 1 IP connection 8 1 2 Ping 8 1 3 Trace Route 8 1 4 Web FTP 8 1 5 ARPwiz 8 1 6 Vo...

Страница 4: ...Results 10 1 Saving Files 10 2 Recalling Files 10 3 File Transfer 10 3 1 USB File Transfer 10 3 2 FTP File Transfer 11 0 Setup Main Menu 12 0 ReVeal Software 12 1 Profiles 12 2 Results 12 3 Software 1...

Страница 5: ...CX350 e Manual D07 00 037 RevC01 Page 5 of 81...

Страница 6: ...ived 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 This user manual is suita...

Страница 7: ...nal level meter capabilities and is equipped with enhanced spectrum forward and return path analysis functions The unit can be equipped with an optional dual band cable modem option to validate DOCSIS...

Страница 8: ...ration 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 li...

Страница 9: ...recessed to prevent accidental power on Press the key for 3 5 seconds to turn the unit on To turn off the unit press the power key for at least 2 seconds If the unit does not respond holding the powe...

Страница 10: ...e use the arrow enter and escape keys to navigate The location of the cursor on the screen is indicated by a focus state The focus state varies depending on the function or section of the test set Pl...

Страница 11: ...back to top Go back to TOC 4 5 Connectors and Panels The connector panel located at the top of the unit comprises the following test ports some are optional CX350 e Manual D07 00 037 RevC01 Page 11 of...

Страница 12: ...To access the Ethernet port remove the protective rubber cover on the right hand side of the unit to expose the connector Ethernet applications include IP connectivity testing Net Wiz testing WiFi Wiz...

Страница 13: ...Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 13 of 81...

Страница 14: ...specific to the test set Single Channel System Scan Tilt Analysis Cable Modem Spectrum Analysis Installation Check USG with FEC Advanced Tools to access more advanced features Return Path Analysis Swe...

Страница 15: ...the main Home menu screen Close Closes screen and returns user to the previous screen QAM unlocked Indicates QAM lock has not been achieved on the digital carrier QAM lock Indicates QAM lock has been...

Страница 16: ...Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 16 of 81...

Страница 17: ...el Tables to perform measurements in Single Channel mode By default the unit is preloaded with several channel tables according to industry standard Annex A B and C systems Selecting a Channel Table T...

Страница 18: ...Channel Table Selection Select a table and press the Edit button Channel Table Editing CX350 e Manual D07 00 037 RevC01 Page 18 of 81...

Страница 19: ...n settings are pre set measurement thresholds for analog and digital carriers By default the unit is pre loaded with Groundblock Set Top Box and Tap locators When performing a measurement one of these...

Страница 20: ...e loss at a certain test point to be automatically compensated When performing a measurement one of these preset test points can be selected by tapping the check box The CX350 stores 10 sets of TP com...

Страница 21: ...Location Editor Location Editor Digital CX350 e Manual D07 00 037 RevC01 Page 21 of 81...

Страница 22: ...Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 22 of 81...

Страница 23: ...ters are displayed The channel to be measured can be entered by either tapping on the Channel box or the Frequency box and use the pop up keypad to enter the channel number or frequency respectively A...

Страница 24: ...Peak Power Measurement Go back to top Go back to TOC 7 1 2 Digital Channel Measurements When testing a digital channel the unit first tries to achieve digital lock Once digital lock is achieved the un...

Страница 25: ...analog systems MER measures how tightly symbols are recorded with respect to an optimum location based on the Error Vector Magnitude EVM Modulation Error Ratio MER and Error Vector Magnitude EVM Rela...

Страница 26: ...e of the signal after the FEC has corrected all the possible errors Severely Error Seconds numeric Constellation graphic Max Adjacent Channel Delta numeric in dB The constellation display supports a z...

Страница 27: ...rection e g FEC will attempt to the correct these errors thus avoiding video impairments Observing the symbol s shape and location relative to their ideal positions allows you to draw some conclusions...

Страница 28: ...own as Phase jitter in a QAM signal it is caused by transponders in the transmission path or by the I Q modulator Phase jitter is a statistical quantity that affects the I and Q path equally Phase noi...

Страница 29: ...is now off Equalizer Off Go back to top Go back to TOC 7 2 Tilt Analysis Overview Tilt measurement is used to check the channel levels at the lowest and highest frequencies because level variations a...

Страница 30: ...vides a graphical overview of the entire channel plan according to the selected active channel table It can provide fast visual confirmation or a snapshot of key analog and digital TV channels or DOCS...

Страница 31: ...pectrum analysis provides a convenient way to measure the amplitude of digitally modulated carriers and to troubleshoot ingress in the forward and reverse paths The following measurements and capabili...

Страница 32: ...y and the frequencies either side can be monitored Vertical scale dB Sets the logarithmic scale to 5dB or 10dB per division Resolution Bandwidth kHz MHz Selectable filter sizes 125kHz 330kHz 1 MHz Res...

Страница 33: ...tal power contained within the 6 or 8 MHz carrier This is similar to needing to measure the area within the signal haystack instead of its height only Using this example the power has to be measured w...

Страница 34: ...ty For maximum sensitivity both the input attenuator and resolution bandwidth settings must be minimized Note Common Path Distortion CPD Produced by poor contacts in the cable distribution network the...

Страница 35: ...in cable modem is able to range register and connect with the headend CMTS to obtain the necessary parameters and a valid IP address on the network Launch the cable modem application to access the set...

Страница 36: ...his can be a time consuming step if the CM is not on a channel 2 CM demodulates the DOCSIS signal and looks for a SYNC message 3 CMTS periodically broadcasts Upstream US Channel Descriptors UCD over t...

Страница 37: ...ownloading CM configuration files for individual customer service These configurations could include Quality of Service QoS parameters Vaseline Privacy Implementation BPI operating frequency assignmen...

Страница 38: ...FTP tab The IP functions are similar to the ones described in IP Tools ARPWiz is not supported on the Cable Modem interface VeTest VeTest is a throughput test to an actual customer speed test server s...

Страница 39: ...option supports CW CW 2 tone QPSK QAM 16 Annex A QAM 64 Annex B QAM 128 Annex A and QAM 256 Annex B signal generation QAM 16 STD Annex A QAM 64 STD Annex A and QAM 128 STD Annex A are with ITU standar...

Страница 40: ...er Functions Go back to top Go back to TOC 7 7 Installation Check Overview This function performs measurements on user pre defined channels up to 16 analog channels and or 16 digital channels can be p...

Страница 41: ...o2 Power Level in dBmV dBuV Video Audio2 Delta in dB Max Adjacent Channel Delta in dB Go back to top Go back to TOC Digital Channels The following measurements are performed for each channel QAM Power...

Страница 42: ...Errored Seconds count Return Path Level Measurement Note Forward Error Correction FEC FEC can only correct errors up to a point after which errors are passed onto the decoding circuitry Pre Post FEC B...

Страница 43: ...itally modulated carriers it is difficult to measure the average power level switch the spectrum analyzer to zero span to obtain an accurate amplitude measurement Check the upstream carrier to noise c...

Страница 44: ...al HFC system tone insertion between channels is not possible therefore In Service Sweep ISS is the preferred solution ISS measures existing channels and makes a comparison Forward Path Sweep Insertio...

Страница 45: ...ysis Remotely performs on demand testing of return path QAM analysis Remotely performs return path alignment with CW signal generated by USG in CX350 To set up connection through Remote View 1 Under A...

Страница 46: ...turn to the USG FEC menu For operations between CX350 and a CX380 unit Remotely View a CX380 unit configured in Responder mode for the following tests Spectrum Analysis Return Path QAM Analysis Return...

Страница 47: ...Modem USB 3G data modem USB Bluetooth with mobile phone dialing Automatic test results upload after each install GPS job location mapping Daily weekly monthly statistical analysis of job technician a...

Страница 48: ...cursor directly to the first event or fault thus eliminating the need to visually interpret the wave form When set in Manual Fault Location MFL mode the waveform can be visually scanned similar to con...

Страница 49: ...ss the AFL key then press Start If the scan stops within the first meter 3 feet it will be identified as the connection between the CX350 and the cable under test Press the Start key to continue the s...

Страница 50: ...Typical Cable Vp and Impedance Values Go back to top Go back to TOC 7 8 7 DS1 Please contact VeEX Customer Care for more information Go back to top Go back to TOC 7 8 8 OFDM The Japanese standard OFDM...

Страница 51: ...8 1 1 IP Connection Setup Enter a Static IP address or use DHCP to connect to the network If DHCP is selected an IP address will be automatically assigned to the test set The user can also turn the DN...

Страница 52: ...ndary DNS IP address if applicable DHCP status Pass or Fail IP connection status Pass or Fail Gateway status Pass or Fail DNS stats Pass or Fail Note Ensure the status is PASS before continuing with a...

Страница 53: ...vailable Profile Recall a Ping profile from memory or create a new test setup Destination Enter the destination IP address or URL to Ping Number of Pings Enter the number of Ping attempts that will be...

Страница 54: ...e is a common method used to find the route to the destination IP address or URL It is often used to identify routing problems and unreachable destinations All the remote IP addresses and their respon...

Страница 55: ...tination Note If there is no response from a particular hop an asterisk will be displayed Trace Route Result Go back to top Go back to TOC 8 1 4 Web FTP FTP The File Transfer Protocol is used to verif...

Страница 56: ...login into server Password Enter password needed to login and authenticate access to the FTP server Press Start to initiate the download or upload process Note For FTP upload the user can also set the...

Страница 57: ...orm a Web Test follow the procedure below Mode Select Web Test from Mode selection Web Mode Select Test from the Web Mode selection Profile Recall a known profile or enter the desired IP address or UR...

Страница 58: ...tion and encoding then press Browse The screen will turn blank while launching the spider web browser engine The web page is divided into quadrants Use the slide keys to navigate up down and left righ...

Страница 59: ...y to translate IP addresses to Ethernet MAC addresses ARP is defined in RFC826 Setup Profile Recall an address stored as a profile or enter a desired IP address Source address Enter the IP address ran...

Страница 60: ...matically report Stations Routers Gateway Printers Provide MAC and IP addresses of each device PING each device and verify that the device is active Provide detected networks NetBiOS IPX etc Status Pr...

Страница 61: ...at least 30 45 seconds for the unit to detect the wireless adaptor and for the software driver to load VPAL products support Linksys USB wireless adaptors only and have the necessary software driver...

Страница 62: ...lity used in WLAN networks but the most likely definition of signal quality or PN code correlation strength is that it is some metric of the correlation between the correct symbol stream and the actua...

Страница 63: ...ptic connectors for dirt and end face quality The handheld probe design enables easy inspection of patch cords and difficult to reach bulkhead or patch panel connectors Clear images are displayed on t...

Страница 64: ...Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 64 of 81...

Страница 65: ...e 9 8 Remote Access Go back to top Go back to TOC 9 1 About This section provides information about the software version serial number Management MAC address and Test MAC addess of the unit Utility Se...

Страница 66: ...back to top Go back to TOC 9 3 Bluetooth This provides the utility to setup Bluetooth paring Go back to top Go back to TOC 9 4 Power This provides information about the current power source and batter...

Страница 67: ...ight if device is not used for and with the pull down menu adjust the duration of the idle time before the backlight is turned off Once the timer is active and the backlight turned off any action on t...

Страница 68: ...be prompted Show Password Hides unhides username and password information associated with FTP and related IP functions Results Saving Upon pressing the Result key the test results can be automaticall...

Страница 69: ...Go back to top Go back to TOC 9 8 Remote Access To set remote VNC access Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 69 of 81...

Страница 70: ...File menu Test Results of the active Test Application SLM Return Path or Spectrum Analyzer are saved in the SD card Test Result Index Go back to top Go back to TOC 10 2 Recalling Files The Explorer s...

Страница 71: ...the folder where the files will be stored on the USB device Press Transfer to start the file transfer An information box appears indicating the transfer is in progress Press OK to exit or abort the fi...

Страница 72: ...Responder IP Port To select the method port for IP connection in responder mode The selections are Management port Cable Modem Bluetooth Data Card and WiFi For remote installation the management port...

Страница 73: ...Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Page 73 of 81...

Страница 74: ...re upgrade test set add options and check instrument configuration 12 4 Tools Remote Control the instrument optional ReVeal CX300 Home Menu For detailed information please refer to the ReVeal CX300 us...

Страница 75: ...Results The Results menu allows you to Download Results Manage Results Create Reports Convert Results to PDF format Convert Results to CSV format Print Results ReVeal CX350 Results Menu CX350 e Manua...

Страница 76: ...re menu allows you to Download software from the VeEX website to upgrade the test set Enable or Disable software options Check Test set configuration Upgrade the Test set software ReVeal CX350 Softwar...

Страница 77: ...your PC to remote control the instrument The test instrument must be connected to the PC via an IP connection Select the Remote Control application located in the Tools menu Start the Remote Control...

Страница 78: ...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 cu...

Страница 79: ...t Specifications The most recent product specifications can be downloaded from the VeEX website For the most recent version click here Go back to top Go back to TOC CX350 e Manual D07 00 037 RevC01 Pa...

Страница 80: ...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...

Страница 81: ...dwide 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 94...

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