testing in the data - · pdf filetier 1 (olts) certification ... or connects a switch port...

Testing Cabling in the Data CenterPart 1 – Fiber Testing

Wayne AllenProduct Marketing EngineerAsia Pacific RegionFluke Networks

© 2015 Fluke Corporation. All rights reserved.

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)© 2015 Fluke Corporation. All rights reserved.

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 14763-3

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.


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!


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


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

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.

Inspecting and cleaning


Inspection and cleaning

There is a standard for inspection in IEC 61300-3-35

Four limits to choose from:

– IEC 61300-3-35 MM (All multimode connectors)

– IEC 61300-3-35 RL >= 26 dB (Field polished connectors)

– IEC 61300-3-35 RL >= 45 dB (Factory polished connectors)

– IEC 61300-3-35 RL >= 55 dB (APC connectors)

ANSI/TIA-568-3.D* will call out this specification

Latest field testers can test to this specification

Resolves arguments as to what is considered clean

* Draft standard

1 Second Autotest


Inspect and avoid cross contamination

Your installed connector

Looks clean

Passes IEC 61300-3-35



Your technician enterswith his/her patch cordto start testing

Or connects a switch port

Said they cleaned it

But they had no inspectionequipment

Fails IEC 61300-3-35



Here’s your installed connector after the technician connectedhis/her patch cord to thepanel

Dirt is transferred, asfiber connectors are a physical contact

Fails IEC 61300-3-35



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”.



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)


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.



If you see the technician setting a reference this way – GOOD!!!

Are you specifying a 1 Jumper Reference?



Encircled Flux launch conditions reduce measurement uncertainty between different multimode sources from 60% to 10%

Are you specifying Encircled Flux for your multimode sources/testing as found inANSI/TIA‐526‐14‐B and IEC 61280‐4‐1?

Over‐filled(Pessimistic result)

Under‐filled(Optimistic result)

Encircled Flux(Correct result)

Core

Cladding


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


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



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?



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 fiber @ 850 nm

– 1.5 dB/km for multimode fiber @ 1300 nm

– 1.0 dB/km for singlemode fiber @ 1310 nm & 1550 nm

This may not be good enough for your application

Talk to your cabling vendor

Look to your design



Agree on a test limit, put it in writing Are you testing to ISO/IEC 14763-3?

– 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 fiber @ 850 nm– 1.5 dB/km for multimode fiber @ 1300 nm– 1.0 dB/km for singlemode fiber @ 1310 nm & 1550 nm

This may not be good enough for your application Talk to your cabling vendor Look to your design



1. Set a 1 Jumper Reference



2. Disconnect from the INPUTs



3. Add in “known good” test reference cords



4. Verify test reference cords – few people do this critical step



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*

* Extra 0.05 dB for adapter variation

Values are stored automatically



6. Disconnect



7. Connect to the link to be tested



8. Run the AUTOTEST


Reference Wizard


8. SAVE the result



Specify how often the technician shouldverify Test Reference Cord values

Require them to be submitted with thecertification results


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

…………….


Time for some Hands On

Testing OM3 MM Fibre– TIA-568-C Test Method

– One Jumper Reference

– Single direction

– IEC 61300-3-35 MM Inspection of End Faces


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


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


Inspecting & cleaning MPO connectors

Inspection requires a camera scopewith 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



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.


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 WizardType B Coupler


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


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


MultiFiber™ Pro

Power Meter850 nm source(EF compliant)

1310 nm source 1550 nm source


Certifying MPO trunk cables

1. Set a reference

12 Fabry Pérot sources 12 Optical meters



2. Disconnect from the INPUT port



3. Add in “known good” cord



4. Connect to link for a 12 fiber, 6 second test


Polarity is reported

Tier 2 certification(Optical Time Domain Reflectometer)


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

LaunchFiber

Tail (Receive)Fiber


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

LaunchFiber

Tail (Receive)Fiber

‐0.30 dB 0.80 dB


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

LaunchFiber

Tail (Receive)Fiber


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

LaunchFiber

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

0.90 dB ‐0.37 dB

‐0.30 dB 0.80 dB


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 singlemodeSame link tested

No reflectance limit Reflectance limit ‐35 dB


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


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

LinkWare™ Live Professional


LinkWare™ Live Professional

Configure the tester from your browser, anywhere

Synchronize to the tester in the field, anywhere


Questions


testing in the data - · pdf filetier 1 (olts) certification ... or connects a switch port...

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