Nd at s best practices for single mode tier i ii testing 01-2011
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The document discusses selecting and operating Optical Time Domain Reflectometers (OTDRs) for fiber optic cable testing. It compares OTDRs to Optical Loss Test Sets (OLTS) and describes how OTDRs can provide additional information about individual connections, splices and fiber sections compared to OLTS. It reviews different OTDR models from Noyes including the M200, M700, OFL280 and C850 and how to set them up and perform basic OTDR operations and testing.
Nd at s best practices for single mode tier i ii testing 01-2011
- 1. OTDR Selection & Operation
- 2. OTDR Selection & Operation Class Differences between OTDR’s and Optical Loss Test Sets Tier 1 & Tier 2 Testing Review of all Noyes OTDR models (M200, M700, OFL280, and C850) Overview of how to set up & test with an OTDR Selecting the right OTDR for a customer’s specific application Overview of OTDR operations and functions (Tier 2) Provide the participant with real life scenarios in testing networks Comparison chart between models for quick reference
- 3. Tier 1 vs. Tier 2 testing… OTDR Connection or splice reflectivity OTDR Connection or splice insertion loss OTDR Link “baseline trace” Tier 2 -- Going beyond the minimum Tier 1 -- Required Can be verified by inspection (of cable markers) or measured using a certification test set or OTDR Link Length OLTS or VFL (red laser) Link Polarity OLTS (certification test set or light source and optical power meter) Link Insertion Loss
- 4. The OLTS (Optical Loss Test Set) or OLS & OPM provide the most accurate loss measurement Link polarity or continuity can be checked with red VFL Length measured with certification sets use the propagation delay method or time delay OLTS limitations: Provides an overall loss value not cause of loss If the link loss falls within specification, the result is saved and the technician moves on to the next fiber If the result is above the limit, the cause is unknown Tier 1 Testing defined
- 5. An OLTS treats a fiber link as a “black box” It can measure only end-to-end loss or power Power (dBm) Distance ? OLTS: Light Source and Power Meter IL (dB) P IN P OUT
- 6. The OTDR takes some of the unknown events in a network and reveals them to the technician Some of these events include fiber length, connector loss, splice loss and kinks or bends In order to measure link loss, fiber rings must be used at the beginning and at the end of the network being tested This is because all OTDR’s can not measure the first and last connection of the “fiber under test” (FUT) The fiber rings provide a horizontal line before and after the link to be tested (See example in slides to follow)… OTDR Features
- 7. Distance P IN P OUT C1 S1 C3 Fiber TIER 2 (OTDR) C2 Relative Power (dB) Allows us to “see” into the link to measure the individual connections, splices, and sections of fiber Opening the black box to see our link
- 8. Adding launch and receive cables enables the OTDR to include the loss of the near-end and far-end connection in total link loss calculations, and measure their reflectance. 1 2 Single event Single event Launch Cable Link Receive Cable Fiber Rings are used as launch & receive cables Network with fibers rings added
- 9. OTDR’s can make event and fiber measurements that an OLTS can’t: Event Loss Fiber Loss Slope Event reflectance (calculated from “D”) D The OTDR advantage
- 10. OTDR’s perform functions an OLTS can’t Baseline Trace Connector Checking Fault Location Break Expected trace Actual trace OTDR Trace Report Loss Connection
- 11. But don’t throw away your OLTS ! An OLTS is required by TIA/EIA-568-C for measuring link insertion loss (Tier 1) It measures Insertion Loss (IL) more accurately than an OTDR All OTDRs tend to under-estimate loss of multimode links; including fiber mis-match losses due to under filled cores Bottom Line: It takes both an OLTS and OTDR to make all Tier 1 and Tier 2 tests
- 12. OFL 280 C-860 Test Set M700 M200 Noyes OTDR models…
- 13. OFL280 FlexTester - Value Proposition M200 features: Transflective display for best viewing Hand-held: < 2.0 lbs Battery > 8-hours Internal & USB data storage VFL Red laser on all models Test modes: Full-Auto, Expert & Live Available in MM, SM & QUAD (MM & SM) Intermediate test range up to 50 miles SM Improved file naming and job creation Simple menus require minimal training
- 14. OFL280 FlexTester - Value Proposition OFL 280 features: Transflective display for OSP applications Hand-held: <2.0 lbs Battery >10-hours with backlight on Can test through splitters Live fiber detection OFL 280-103 model can measure downstream power levels at 1490nm & 1550nm and perform OTDR measurements at 1625nm on active networks
- 15. FRONT OTDR (1310/1550 nm) Optical Power Meter (OPM) Visual Fault Locator (650 nm) Tool-free battery door Bale Padded Carry Handle (side-panel) Power Input 18 VDC (side-panel) 2 nd USB Drive Port (in protected slot) USB Host & function ports VFL & OPM standard on all models M700 Top/Rear Panel Features
- 16. M700 – QUAD & SM OTDR M700 Features: Designed for OSP & PNG applications Available in SM, Triple & QUAD versions 40 dB dynamic range > 160km (100mi) Short event & attenuation dead zones User interface is easy to use Data storage > 1,000 traces Live fiber protection Battery > 8 hours Weight 5 lbs
- 17. Introducing the C-series QUAD OLTS & QUAD OTDR Auto-Test (OLTS) two fibers bi-directionally C-850 Fully integrated with OLTS, OTDR, and VFL Can measure Loss & Length with Pass / Fail results Complete Tier 1 & Tier 2 certification testing with reports in TRM provide concise professional reports The “JOB” setup can be used for OLTS and OTDR Data storage available on internal memory & USB C-860 kit
- 18. FRONT OTDR SM MM Visual Fault Locator (650 nm) Tool-free battery door Bale Padded Carry Handle (side-panel) Power Input 18 VDC (side-panel) 2 nd USB Drive Port (in protected slot) OLS SM MM OPM USB Host & function port VFL & OPM standard on all models C850 Top/Rear Panel Features
- 19. Tier 1 Pass/Fail using Auto-Test from C860 Complete Network Certification
- 20. Test Modes Utilities M700 Main Menu
- 21. Back, Menu, and Tab touch keys Menus and test results are displayed here Soft Key key labels and touch keys Page name and status SK1 SK2 SK3 SK4 SK5 Battery status M & C series Typical Page
- 22. Full Auto (Automatic OTDR) Expert (Manual, Auto, Auto-Once OTDR) OPM (Optical Power meter) Real-Time (Real-time OTDR) Fiber type, launch & receive test cord lengths Wavelength, range, pulse-width and filter Averaging time Event thresholds Wavelength Units (dB/dBm) (Set) Reference Automatic or default settings Test Mode Settings
- 23. Too short : less than link length Link Can’t see entire link – unpredictable results Good : about 1.5x to 2x link length Link Good trace – can see end of fiber. Too long : much larger than link length Link Trace is “squashed” into left side of display. Selecting the correct test Range
- 24. Too wide: Can’t resolve events About right: Events can be seen and trace is smooth Too narrow: Trace “disappears” into noise floor Link Link Link Where is this event? Selecting the correct Pulse Width (PW)
- 25. Example of 140km fiber run with correct range & PW
- 26. M200 with fiber rings attached
- 28. C850 trace with bad connector
- 29. Too many Trace is smooth but waste of time About right: Trace is smooth Too few: Trace is noisy – noise floor is too high Link Link Link Selecting the correct Averages (Time)
- 30. Full-Auto Always tests all wavelengths applicable to the fiber type Always creates an Event Table Pings to determine Range – adds time to each test Pitfalls of Expert Auto and Auto Once If you go from a short to a long fiber and do not change the range the technician needs to be astute and realize that they have not seen the end of the FUT and needs to adjust the Range & PW or reshoot w Auto-Once to re-adjust for the longer FUT Select the correct length for Launch/Receive cables (PW in ns)/10 = the nominal event width of the spike in meters Launch > (3-5 x length of pulse in meters) How to set up & test with an OTDR
- 31. Event and Attenuation Dead Zones Idealized trace of a reflective event at the shortest pulse width, P MIN . P MIN Real OTDR trace. 0.5 dB Event Dead Zone Attenuation Dead Zone 1.5 dB
- 32. Sample triple wavelength trace
- 34. Review a specific event
- 35. Summary Table
- 36. Selecting the correct OTDR What’s the fiber type? Wavelengths required? What’s the fiber length? This determines the range Does the customer want: hand-held or full size? Are they fault locating or certifying a network? Answering these questions in this order will help to select the correct OTDR for your customer’s application For certification be sure to combine the correct OTDR with the TRM software for concise reports Consider the following when selecting your OTDR
- 37. OTDR selections by market PNG: M200 QUAD or M700-25 QUAD The customer could add OLS 4 to the M700-25 for complete Tier 1 and Tier 2 solution PNG Plus other: M700-24 Long Range QUAD Suitable for users installing PNG, Metro, WAN & Telco/BB FTTx: Best solution is our OFL 280 FlexTester All four SM models can test through splitters/PON Mode Telco / Broadband: M700-20, M700-21or OFL 280 Economical hand-held solution for SM links < 80 miles Using an OLS 2-DUAL/OLS4 with the M700 creates a complete SM/MM test solution allowing the technician to use TRM for Tier1/Tier 2 testing and reporting
- 38. Measurement Range Dynamic Range - 6 dB (always specified at P MAX ) Noise floor – trace power equals average OTDR noise power or SNR = 1 Level at which OTDR can accurately measure 0.5 dB event 0.5 dB 6 dB P MAX Backscatter level at OTDR test port Calculating Measurement Range from Dynamic Range Dynamic Range Measurement Range
- 39. OTDR comparison chart NOYES OTDR's - ALL Models All Noyes OTDR's come with a built in VFL port MM SM RANGE Km / mi @1550 OPM OLS PON Mode Comments: M200-00-0900PR YES YES 100 / 62 NO NO NO Available in MM, SM or QUAD versions 850/1300/1310/1550 - 22/22/26/26dB M200-11-0900PR NO YES 100 / 62 NO NO NO 1310/1550nm - 26/26 dB M200-12-0900PR YES NO N/A NO NO NO 850/1300nm - 22/22 dB M700-20U-01 NO YES 160 / 99 YES NO NO 1310/1550nm - 40/38dB Long Range (LR) M700-21U-01 NO YES 160 / 99 YES NO NO 1310/1550/1625nm - 40/38/38dB LR Triple M700-24U-01 YES YES 155 / 96 YES NO NO 850/1300/1310/1550nm LR Quad 24/24 MM - 39/37dB SM M700-25U-01 YES YES 100 / 62 YES NO NO Replaced M650 - QUAD 22/22 MM - 26/26dB SM OFL 250-50U NO YES 100 / 62 YES YES NO 1550nm only - 26dB OFL 280-100 NO YES 133 / 82 YES YES YES 1310/1550nm - 34/32dB OFL 280-101 NO YES 133 / 82 YES YES YES 1310/1550/1625nm - 34/32/30dB OFL 280-102 NO YES 133 / 82 YES YES YES 1310/1490/1550nm - 34/32/32dB OFL 280-103 NO YES 133 / 82 YES YES YES Only model with Live fiber testing capability 1310/1550/1625nm - 34/32/30 dB C850 YES YES 100 / 62 YES YES NO Certification OTDR w/ Large 6.5" Display 850/1300/1310/1550 - 22/22/26/26dB 8-17-10 Rev J
- 40. Thank you! For more information about the AFL -Noyes Test & Inspection products, please visit us on the web at: www.AFLglobal.com Or call our Sales or Technical Support group at: 1 603 528 7780 1 800 321 5298 (USA)