VeEX MTTplus-420 User Manual Download Page 46 | Manualshive

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9.0 Troubleshooting GPON Alarms/Errors

Alarms and performance monitoring encompasses mechanisms to detect link failure and monitor the health and performance of

links. This clause does not cover such functions as station management, bandwidth allocation or provisioning functions.

The flow chart illustrates OAM functions installed in the ONU and OLT. It also shows the Alarm

notification signals between OLT and ONU.

MTTplus-420_User_Manual_RevC00

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Summary of Contents for MTTplus-420

Page 1: ......

Page 2: ...or Panels 5 0 Preparing for Operation 5 1 Equipment Check List 5 2 GPON ITU T G 984 Test Standards 6 0 Optical Fiber Patch Cord Preparation 6 1 Contamination 6 2 Inspection 6 3 Cleaning Procedure 6 4...

Page 3: ...s with File Manager 6 8 6 1 File Manager Filters 6 8 6 2 Backing up and Restoring Test Profiles and Results From USB 7 0 Optical Power Meter OPM Test Mode 7 1 Optical Power Meter OPM Test Procedure 7...

Page 4: ...Upstream Alarms Errors 9 2 1 LOS 9 2 2 LOF 9 2 3 LCDG 9 2 4 BIP 9 2 5 RDI 9 2 6 REI 9 2 7 Corr FEC 9 2 8 Uncor FEC 10 0 GPON Rogue ONU Detection 11 0 GPON Wizard 12 0 Splitter Analysis 13 0 Distributi...

Page 5: ...tream and Password Message Upstream C 2 7 Assign_alloc ID Message Downstream C 2 8 Acknowledge Message Upstream C 2 9 Con gure_port ID Message Downstream C 2 10 Encrypted_port ID Message Downstream C...

Page 6: ...ions C 2 21 PST Protection Switch Message Both Directions C 2 22 Change_power_level Message Downstream Unicast or Broadcast C 2 23 PON ID Downstream optional C 2 24 Downstream optional C 2 25 Ranging_...

Page 7: ...ted by copyright and contains trade secrets of VeEX Inc or VeEX s licensors The purchaser of this device and or software downloaded or embedded agrees that it has received a license solely to use the...

Page 8: ...rtant information needed to use this product and avoid missteps Cautions against and action or inactivity which can hinder productivity Strongly warns against a condition an action or inactivity which...

Page 9: ...and protection circuitry sealed in its plastic container that shall not be disassembled or serviced The test set unit s battery pack is also fitted with a safety connector to prevent accidental short...

Page 10: ...erform 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 modul...

Page 11: ...es it The upstream transmissions called burst mode operation is allocated on an as need basis by the OLT for each ONU ONT that needs to send data Because the TDM method involves multiple users on a si...

Page 12: ...rscope via OTG cable 1577nm signal level only measurement option is available Consult factory Optical GPON designed to meet levels as defined by ITU standard when testing at ONT site Data Analysis ONT...

Page 13: ...oving Test Modules and other features specific to the MTTplus host chassis refer to the MTTplus Platform manual 4 1 Connector Panels The MTTplus 420 module connector panel features an ONU port To ONU...

Page 14: ...lass C Min Span Loss Budget G 984 2 5 13 15 Max Span Loss Budget G 984 2 20 28 30 Min Span Loss Budget G 984 2 Amd 2 Digital Only 5 13 10 15 Max Span Loss Budget G 984 2 Amd 2 Digital Only 20 28 28 30...

Page 15: ...ss A Class B Class B Class C Class C Class A Class B Class B Class C Class C Min Avg Power 0 5 1 5 3 10 21 21 28 28 32 Max Avg Power 4 9 5 7 9 1 1 8 8 8 Launch power specifications for downstream and...

Page 16: ...8 ONU prepares response PLOAM NOTE 9 OLT measures time until response is received and calculates the adjustment to the ONU s Equalization Delay NOTE 10 ONU updates its equalization delay NOTE 11 Trans...

Page 17: ...power levels but also impacts back reflectance performance and levels which is harmful to sensitive optical components Dirty fiber end faces can cause back reflectance and insertion loss Go back to t...

Page 18: ...ith fiber optic connections Always check that the laser or transmitter is disconnected before cleaning the connector end faces Go back to top Go back to TOC 6 3 Cleaning Procedure To ensure proper and...

Page 19: ...e contaminants that have dried and attached to the connector or fiber end face 2 Rub the fiber end face perpendicularly against a dry lint free wipe several times 3 Alternatively use compressed air to...

Page 20: ...eposit Go back to top Go back to TOC 6 4 Best Practices Never touch the end face of an optical fiber connector with any hands or fingers Always install dust caps on unplugged fiber connectors Store un...

Page 21: ...ing which dictate the optical performance level of terminated fiber optic connectors Insertion Loss IL The most important performance indicator of a fiber optic connection This is the loss of light si...

Page 22: ...to top Go back to TOC 6 6 Fiber Patch Cords 900 m Patchcords Simplex single fiber or Duplex two fibers construction Singlemode or Multimode Pig tails Outer Diameter is usually 1 6mm 2 0mm and 3 0mm D...

Page 23: ...he strain relief boot that protects the fiber from bending at a connector is color coded to indicate the type of connection Connectors with a plastic shell such as SC or E2000 typically use a color co...

Page 24: ...screw down the connector to fix in the optical fiber Do not over screw the connector or it will damage the optical fiber and the port Go back to top Go back to TOC 6 7 1 Preventing Inaccurate Readings...

Page 25: ...d on option for fiber optics testing The Optical Power Meter application in Fiber Tools works with a tethered FX4x FX8x OPM OLTS meter as an add on fiber optics testing capability Fiberscope located i...

Page 26: ...le for single fiber analysis only When Ask Before Save is selected the Save menu will display with naming and comment options Autosave on Tap On the Capture tab tap the screen to automatically save th...

Page 27: ...Tip Type from the drop down box General Encompasses standard SC FC ST and other 2 5 mm ferrules LC Lucent connector male Encompasses 1 25 mm ferrules LC MU LC female Lucent connector adapter Encompass...

Page 28: ...ty to automatically freeze the image when the image comes into focus Rectangles Dots Dots draw a red contour around scratches and defects Rectangles highlight scratches and defects without obstructing...

Page 29: ...the image onto the Capture tab Save Manually saves and names the image displayed in Capture Modify Select a file or folder in the directory to modify Options to Rename Remove and upload the selection...

Page 30: ...Uploading Downloading Files with Fiberizer Cloud Before attempting to upload or download ensure that the test set is successfully connected to Fiberizer Cloud Tap on Push next to a directory item to u...

Page 31: ...vent accidental deletion PDF Converts all selected files Requires FAT32 USB Memory stick To backup and restore files from a USB Memory stick To USB Copies all selected files to the stick From USB Rest...

Page 32: ...nd From USB Functions 1 To enable the To USB and From USB functions insert a USB Memory stick FAT32 file format into a USB port on the side of the unit 2 Wait for the USB memory to be detected the fol...

Page 33: ...est is running The RUN icon indicates a test is running C GPON Diagram Network diagram of the GPON network Connect the MTTplus 420 between the splitter and ONT ONU Do NOT connect the MTTplus 420 betwe...

Page 34: ...Test and Profile Settings for information on test profile setup Green The measured signal is above the critical threshold Yellow The measured signal is below marginal and above critical Red The measu...

Page 35: ...ected during the measurement interval but it is no longer present or active Tap Advanced to view Alarms Errors PLOAM and OMCI The History button resets the LEDs of past statuses If any LED remains red...

Page 36: ...ors again as specified in Step 4 6 Inspect and clean the patch cord connectors that will connect MTTplus 420 to ONU ONT and the ONU ONT test port 7 Connect the MTTplus 420 to the ONU ONT test port If...

Page 37: ...he ONU activation and the above process will not be completed In this instance LOF will be reported for the upstream side no ONU ID or ONU S N information on the OPM results page will be displayed Go...

Page 38: ...y which ONT ONUs are connected to Splitter Distribution Analysis used to verify ONTs are connected to the right splitter port Starting stopping restarting measurements from Advanced Results starts sto...

Page 39: ...ess the Start button and the test will be activated automatically when the programmed start time is reached Filter Upstream Overhead When active prevents capture in the PLOAM Decoder log of Upstream_O...

Page 40: ...The Advanced Results menu displays additional Errors Alarms and Event details Summary The summary tab displays a summary of test results including DS US signal levels PON ID and alarm statuses all on...

Page 41: ...error or alarm was detected during the measurement interval but it is no longer present or active White Not available Gray Not activated Go back to top Go back to TOC Tapping the individual soft LED...

Page 42: ...eam results A graphical timeline on the horizontal axis indicates when the event occurred in seconds Tap on the upper left and right arrows to scroll through the measurement period The and keys zoom i...

Page 43: ...r type of event start time duration alarms and ratio count errors are displayed Go back to top Go back to TOC 8 3 Active ONU Active ONU lists all of the ONUs that have been activated by the OLT since...

Page 44: ...ONU Disconnected The last ONU activated will be green The last ONU activated Go back to top Go back to TOC 8 4 PLOAM Decoder MTTplus 420_User_Manual_RevC00 Page 44 of 75...

Page 45: ...oder Screen OMCI messages are used by GPON network to manage PON services and ONU equipment The Optical Network Unit Management and Control Interface OMCI specifies the managed entities of a protocol...

Page 46: ...d performance of links This clause does not cover such functions as station management bandwidth allocation or provisioning functions The flow chart illustrates OAM functions installed in the ONU and...

Page 47: ...rame LOF in the system and the ONT goes offline Possible LCDG Causes Optical fiber is faulty or ONT is faulty LCDG Troubleshooting 1 Check the optical fiber If the optical fiber is not connected prope...

Page 48: ...ovides an approximate method for monitoring link quality at the bit error level GPON downstream frame structure GPON upstream frame structure Go back to top Go back to TOC MTTplus 420_User_Manual_RevC...

Page 49: ...sponds to the number of correctable transmission errors 9 1 8 Uncor HEC Uncorrectable Header Error Checksum The value corresponds to the number of corrupted frame errors that were dropped by the recei...

Page 50: ...led for Class C 60km SFP networks When FEC is enabled the unit reports each correctable FEC error detected in the upstream burst Possible Corr FEC Causes The quality of the optical path is deteriorate...

Page 51: ...ransmission at its expected BWmap stop time 2 Time related malfunctions or issues which are harder to detect and isolate GPON network data is transmitted using a scrambler without any redundancy CRC o...

Page 52: ...h guides the user through the process with on screen images to show how to connect the tester 1 Tap on GPON Wizard 2 Follow the instructions on screen and tap OK 3 Remove existing MTTplus OLT connecti...

Page 53: ...4 Follow on screen instructions and tap Next MTTplus 420_User_Manual_RevC00 Page 53 of 75...

Page 54: ...Once connected the status LED s will go from Red to Green 5 Test complete follow on screen instructions 6 Tap Next Port to test the next port MTTplus 420_User_Manual_RevC00 Page 54 of 75...

Page 55: ...7 Add next port number 8 Follow on screen instructions and tap Next MTTplus 420_User_Manual_RevC00 Page 55 of 75...

Page 56: ...Once connected the status LED s will go from Red to Green 9 Test in progress MTTplus 420_User_Manual_RevC00 Page 56 of 75...

Page 57: ...10 If testing more ports follow instructions above if ending the test tap on Stop 11 Save test results MTTplus 420_User_Manual_RevC00 Page 57 of 75...

Page 58: ...Go back to top Go back to TOC MTTplus 420_User_Manual_RevC00 Page 58 of 75...

Page 59: ...12 0 Splitter Analysis 1 Tap on Splitter Analysis and enter the name of the cabinet tap apply Name the Cabinet 2 Select Panel Type and tap OK MTTplus 420_User_Manual_RevC00 Page 59 of 75...

Page 60: ...Panel Type 3 Enter the Rack number tap on start and follow the instructions Parameter Parameter MTTplus 420_User_Manual_RevC00 Page 60 of 75...

Page 61: ...each square to view the S N Meaning of characters L Empty N No S N O ONU S N detected 5 Tap on Stop and the remaining cells will be filled with empty L Tap on Save to save the splitter analysis and g...

Page 62: ...13 0 Distribution Analysis 1 Tap on Distribution Analysis and enter the name of the cabinet tap apply Name the Cabinet 2 Select Panel Type and tap OK MTTplus 420_User_Manual_RevC00 Page 62 of 75...

Page 63: ...Panel Type 3 Enter the Rack Number tap on start and the follow the instructions Parameter Parameter MTTplus 420_User_Manual_RevC00 Page 63 of 75...

Page 64: ...ew the S N Meaning of characters L Empty N No S N O ONU S N detected X Position skipped 5 Tap on Stop and the remaining cells will be filled as empty L Tap on Save to save the distribution analysis an...

Page 65: ...mation on the following functions common to all MTTplus series units Tools IP Tools Net Wiz WiFi Wiz Advanced Browser Utilities Settings Help Backlight VeEXpress R Server Files Saved USB Manage Go bac...

Page 66: ...nt The Council of the European Union and the European Parliament adopted Directive 2002 95 EC January 27 2003 to Reduce the use of certain Hazardous Substances RoHS in Electrical and Electronic Equipm...

Page 67: ...p and integrate service verification features across copper fiber optics CATV DOCSIS mobile 4G 5G backhaul and fronthaul next generation transport network Fibre Channel carrier metro Ethernet technolo...

Page 68: ...rk G PON A variant of the passive optical network PON access technology supporting transmission rates in excess of 1 Gbit s and based on the G 984 series of ITU T Recommendations GTC adaptation sublay...

Page 69: ...ular response time The purpose of the requisite delay is to compensate for variation of propagation and processing delays of individual ONUs and to avoid or reduce the probability of collisions betwee...

Page 70: ...ethod G PON Gigabit capable Passive Optical Network GTC Gigabit capable passive optical network Transmission Convergence HEC Header Error Control IP Internet Protocol ISDN Integrated Services Digital...

Page 71: ...sive optical network Section Trace PSTN Public Switched Telephone Network PSync Physical Synchronization PTI Payload Type Indicator QoS Quality of Service RDI Remote Defect Indication REI Remote Error...

Page 72: ...power level using the absence of directed messages from the OLT as a negative acknowledgment The OLT discovers the serial number of a newly connected ONU and sends an Assign_ONU ID message to assign a...

Page 73: ...OLT periodically sends a broadcast serial number request on the PON the ONU announces its presence by sending the OLT a Serial_number_ONU message An ONU also sends this message in the ranging state i...

Page 74: ...the G PON frame structure the OLT sends a PLOAM message downstream unconditionally in every frame If the message queue is empty the OLT sends a No_message message The same is true in the upstream dir...

Page 75: ...the OLT can test the ONU before returning it to full service If the ONU does not recover from the LOS or LOF alarms it will not receive the broadcast or directed POPUP message and will move to the In...

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