What testing is required for PREMISES Fiber Optic Cabling and the standards used

Transcription

1 Testing Cabling in the Data Center Part 1 Fiber Testing Wayne Allen Product Marketing Engineer Asia Pacific Region Fluke Networks In this presentation What testing is required for PREMISES Fiber Optic Cabling and the standards used Introducing the CertiFiber PRO Optical Loss Test Set (OLTS) & FI-7000 Camera Inspection and cleaning Tier 1 (OLTS) certification Hands on session after theory Duplex links MPO/MTP links with OLTS and MultiFiber PRO Introducing the OptiFiber PRO Optical Time Domain Reflectometer (OTDR) Tier 2 (OTDR) certification Hands on session after theory Test results management (LinkWare Live)

2 What Testing is Required for Fiber Installs? Varies depending on the Test Standard you are using TIA has a standard for testing under the TIA-568-C standards ISO/IEC has a field test standard called IEC Both standards require Insertion Loss and Length of the Link Light Source and Power Meter is the preferred method for loss Most popular approach is to use an Optical Loss Test Set (OLTS) because it gives the loss at the required wavelengths and link length For Multimode fiber we test at 850nm and 1300nm only For Singlemode fiber we test at 1310nm and 1550nm only We then document our test results. What Testing is Required for Fiber Installs? Notice we did not mention Optical Time Domain Reflectometer (OTDR) as our tester of choice! OTDRs have issues that tend to give us the wrong result when testing an installed fibre link to be used in premises cabling. They can be overly optimistic or overly pessimistic, it depends on the amount of backscatter from the fibre under test, to work, OTDRs work on light reflected back to the instrument, this is called backscatter. The loss measured can be less than that given by an OLTS Means you could PASS a FAILING Link, giving a network owner big issues with newer applications not working. 100GB on MMF has a loss budget of 1.5dB on OM3 Cable. However, OTDRs are great for troubleshooting or spotting out of tolerance components. More on this later!

3 What Testing is Required for Fiber Installs? Best Practise is Standards Based Testing Using TIA-568-C Tier 1 or Basic Testing is mandatory We use and CAN ONLY use an OLTS to make this measurement Depending on the Contract, Tier 2 is OPTIONAL If Tier 2 is required, we MUST do Tier 1 or Basic Testing first, then We use an OTDR to generate a trace from both ends of the link under test We then Bi-Directionally average out the two results for each fibre Introducing the CertiFiber PRO OLTS

4 CertiFiber PRO & FI 7000 FiberInspector PRO CertiFiber PRO OLTS CertiFiber PRO Optical Loss Test Set Singlemode, Multimode, Quad modules Built-in VFL Auto Pass/Fail analysis Innovative New Features 3 sec Autotest Encircled Flux compliant out of the box Guided set-reference wizard Dual wavelength measurement on single fiber Integrated USB inspection camera

5 Avoid Setup Errors with Intuitive User Interface 1 jumper reference 2 jumper reference 3 jumper reference Automated Referencing Procedure No More mistakes Allows TRC Checking as part of the process Is my gear good?? Works for MM & SM Cabling and any connector combination PC, UPC or APC polish.

6 Inspecting and cleaning Inspection and cleaning * Draft standard There is a standard for inspection in IEC Four limits to choose from: IEC MM (All multimode connectors) IEC RL >= 26 db (Field polished connectors) IEC RL >= 45 db (Factory polished connectors) IEC RL >= 55 db (APC connectors) ANSI/TIA D* will call out this specification Latest field testers can test to this specification Resolves arguments as to what is considered clean 1 Second Autotest

7 Inspect and avoid cross contamination Your installed connector Looks clean Passes IEC Inspect and avoid cross contamination Your technician enters with his/her patch cord to start testing Or connects a switch port Said they cleaned it But they had no inspection equipment Fails IEC

8 Inspect and avoid cross contamination Here s your installed connector after the technician connected his/her patch cord to the panel Dirt is transferred, as fiber connectors are a physical contact Fails IEC Inspect and avoid cross contamination Cleaning falls into two categories Dry cleaning Wet to dry cleaning Dry cleaning is popular since it is potentially quicker to do Not very effective with end faces contaminated with grease from fingers or baked on dirt.

9 Inspect and avoid cross contamination Cleaning falls into two categories Dry cleaning Wet to dry cleaning Wet to dry cleaning using a fiber solvent removes grease and other nasties Use as a back up when the dry cleaning does not work, followed by inspection of course. Tier 1 certification of duplex links (Basic Testing) (Optical loss testing)

10 Tier 1 (OLTS) certification If you see the technician setting a reference this way STOP!!! Setting a reference through a bulkhead adapter will result in optimistic, unpredictable and potentially negative loss results. Tier 1 (OLTS) certification If you see the technician setting a reference this way GOOD!!! Are you specifying a 1 Jumper Reference?

11 Tier 1 (OLTS) certification Encircled Flux launch conditions reduce measurement uncertainty between different multimode sources from 60% to 10% Core Cladding Over filled (Pessimistic result) Under filled (Optimistic result) Are you specifying Encircled Flux for your multimode sources/testing as found in ANSI/TIA B and IEC ? Encircled Flux (Correct result) Why is CertiFiber PRO EF Compliant? We use the Matched Source and Test Reference Cord (TRC) Method Tester vendor specific More elegant Significantly cheaper than any other approach Most reliable for accurate measurements

12 Tier 1 (OLTS) certification Test Reference Cords (TRCs) are a requirement in ANSI/TIA & ISO/IEC Patch cords from a distributor are specified with a loss of up to 0.5 db Test Reference Cords per ANSI/TIA & ISO/IEC Multimode Loss 0.10 db Singlemode Loss 0.20 db Tier 1 (OLTS) certification Test Reference Cords (TRCs) are a requirement in ANSI/TIA & ISO/IEC Patch cords from a distributor are specified with a loss of up to 0.5 db Are you specifying reference grade test cords?

13 Tier 1 (OLTS) certification Agree on a test limit, put it in writing Are you testing to ANSI/TIA-568-C? 0.75 db per mated connections for multimode and singlemode 3.5 db/km for multimode 850 nm 1.5 db/km for multimode 1300 nm 1.0 db/km for singlemode 1310 nm & 1550 nm This may not be good enough for your application Talk to your cabling vendor Look to your design Tier 1 (OLTS) certification Agree on a test limit, put it in writing Are you testing to ISO/IEC ? 0.50 db for mated first and last connections for multimode, all other mated connectors are 0.75dB 0.75dB per mated connections for singlemode 3.5 db/km for multimode 850 nm 1.5 db/km for multimode 1300 nm 1.0 db/km for singlemode 1310 nm & 1550 nm This may not be good enough for your application Talk to your cabling vendor Look to your design

14 Tier 1 (OLTS) certification 1. Set a 1 Jumper Reference Tier 1 (OLTS) certification 2. Disconnect from the INPUTs

15 Tier 1 (OLTS) certification 3. Add in known good test reference cords Tier 1 (OLTS) certification 4. Verify test reference cords few people do this critical step

16 Tier 1 (OLTS) certification 5. Review test reference cord values For field verification of TRCs, Fluke Networks recommends the following values Multimode Loss 0.15 db* Singlemode Loss 0.25 db* Values are stored automatically * Extra 0.05 db for adapter variation Tier 1 (OLTS) certification 6. Disconnect

17 Tier 1 (OLTS) certification 7. Connect to the link to be tested Tier 1 (OLTS) certification 8. Run the AUTOTEST Reference Wizard

18 Tier 1 (OLTS) certification 8. SAVE the result Tier 1 (OLTS) certification Specify how often the technician should verify Test Reference Cord values Require them to be submitted with the certification results

19 Test results what format? The following formats are not acceptable:.doc.csv.txt.pdf As they can be altered Always insist on getting the results in the vendors software Fluke Networks uses LinkWare PC Software Print summary results, but not everything! It s easier to sort electronically Nice to the environment Cheaper to store.

20 Time for some Hands On Testing OM3 MM Fibre TIA-568-C Test Method One Jumper Reference Single direction IEC MM Inspection of End Faces Time for some Hands On Follow on with me as we create the test. Create a Project called Bangkok Workshop Delete existing tests and Cable IDs, Add Test for OM3, MM, tested to TIA-568-C, 1 Jumper Method. Save Test Add Cable IDs First ID Fiber01A Last ID Fiber06B Select the Test as Fiber, Tick End Face Inspection and Loss/Length Add a new test Select Fiber Inspector You will be using the MM Fiber -35dB RL test. Save

21 Time for some Hands On Lets now do some testing! Inspect and clean if necessary all Test Reference Cords Connect Camera via the USB Port and use the 2.5mm Camera Tip Make sure you check the tester output port, use 2.5mm Bulkhead Tip Save at least 2 TRC End Face pictures from one TRC When we are happy that everything is clean, we can Set References Follow with me as I step through the procedure. We follow the Referencing Wizard, don t skip steps! Once we PASS the referencing, we can start testing. Follow along with me as we step through the test procedure. Certifying MPO/MTP trunk cables

22 Inspecting & cleaning MPO connectors Inspection requires a camera scope with a special adapter tip MPO/MTP Adapter Tip Certifying MPO trunk cables with CertiFiber PRO You can do it using a duplex tester such as the CertiFiber Pro

23 Certifying MPO trunk cables with CertiFiber PRO Perform a 1 Jumper Reference Verify your TRCs Validates that CertiFiber and TRCs are good Locate your Hydra Break out cables You will need 2 and a Type B MPO adapter. Certifying MPO trunk cables with CertiFiber PRO We need to reference out our LC connections on the Hydra cable. Connect one Hydra cable to the main unit Attach the Coupler Connect the Remote Set a Manual Reference Don t use the Wizard Type B Coupler

24 Certifying MPO trunk cables with CertiFiber PRO We MUST change our Reference Method to perform the tests. We change to a 3 Jumper Method LCs were referenced out We are testing the Trunk and MPOs Type B Coupler Certifying MPO trunk cables with CertiFiber PRO You can do it using a duplex tester such as the CertiFiber Pro Installers have a tough time meeting projects time lines using a duplex tester

25 MultiFiber Pro Power Meter 850 nm source (EF compliant) 1310 nm source 1550 nm source Certifying MPO trunk cables 1. Set a reference 12 Optical meters 12 Fabry Pérot sources

26 Certifying MPO trunk cables 2. Disconnect from the INPUT port Certifying MPO trunk cables 3. Add in known good cord

27 Certifying MPO trunk cables 4. Connect to link for a 12 fiber, 6 second test Polarity is reported Tier 2 certification (Optical Time Domain Reflectometer)

28 Tier 2 (OTDR) testing As with Tier 1, agree on the limits Specify Connection loss Splice loss Reflectance (Will impact 10GBASE-L and higher speeds) Method Launch + Tail fibers to be used Tested in both directions Bi-directional averaging reported Verify the launch fibers If you use a launch and tail fiber, you can verify them before testing Poor launch fibers represent the majority of support calls Launch Fiber Tail (Receive) Fiber

29 Using a tail fiber With a tail fiber, the connection at the far end is characterized Requires a technician to be at the far end Most common objection to doing this 0.30 db 0.80 db Launch Fiber Tail (Receive) Fiber Testing in one direction only? Is that really a fail at connection? Event limit set to 0.75 db 0.30 db 0.80 db Launch Fiber Tail (Receive) Fiber

30 Testing in one direction only? Tested in the other direction, it now fails at connection! Event limit set to 0.75 db 0.90 db 0.37 db Launch Fiber Tail (Receive) Fiber Bi directional averaging When bi-directional averaging is implemented Mismatches in backscatter etc. between the launch/tail fibers and the fiber under test are taken out, mathematically speaking 0.30 db 0.80 db 0.90 db 0.37 db

31 Bi directional averaging When bi-directional averaging is implemented Mismatches in backscatter etc. between the launch/tail fibers and the fiber under test are taken out, mathematically speaking 0.30 db 0.22 db Wrong test limit OTDR loss event measurements heavily rely on good reflectance Poor reflectance can result in Optimistic / negative loss readings Errors when the application runs Agree on a reflectance limit As a guide (talk to your vendor) -35 db for multimode -40 db for singlemode -55 db for APC singlemode No reflectance limit Reflectance limit 35 db Same link tested

32 More Hands on Time Fit the OTDR Module to the Main Unit Go into our Bangkok Workshop Project New Test, Auto OTDR, OM3 Cable, TIA-568-C Test Method Locate the Launch and Tail Fibres Select the Fiber Inspection Test again Inspect and clean if necessary the Launch and Tail Cables Select the Auto OTDR Test We now set our compensation, follow me on the screen We can now run our test on the fiber Let s review the test. LinkWare Live Essentials

33 Monitor the project from your phone Check for: Number of tests Test limit(s) used Cable IDs used Uploading to LinkWare Live USB WiFi Dongle

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38 LinkWare Live Professional LinkWare Live Professional Configure the tester from your browser, anywhere Synchronize to the tester in the field, anywhere

39 Questions