MPO/MTP Testing for 10 –100Gb/s Readiness · PDF file• The image is saved as a TIFF...

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MPO/MTP Testing for 10 – 100Gb/s Readiness Mike Kazemian Synergix International [email protected] New Ethernet Speeds Require New Methods For The Certification of Infrastructure for 10GbE, 40GbE und 100GbE

Transcript of MPO/MTP Testing for 10 –100Gb/s Readiness · PDF file• The image is saved as a TIFF...

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MPO/MTPTesting for 10 – 100Gb/s Readiness

Mike KazemianSynergix International

[email protected]

New Ethernet Speeds Require New  Methods For The Certification of Infrastructure for 

10GbE, 40GbE und 100GbE

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• Standards: Application, Cabling, Components, …• Field Testing

– Test Cords and Methods– EF … Encircled Flux– Test Regimes

• MTP/MPO Testing In The Field– ….for 40/100Gb/s Applications– … for  10Gb/s Applications

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Agenda

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Choosing the right limit ….. It’s often not simple

Component RequirementsComponent Requirements

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Standards Based LimitsType λ (nm)  Loss‐Limit Units / Comment

Applications

….the transmissionpath has to comply with the application or channel requirements

List is not complete!

IEEE 802.3: 10GBASE‐SR/SW  850 2.6 dB requires OF‐300IEEE 802.3: 10GBASE‐LR/LW  1310 6.2 dB requires OF‐2000ISO/IEC 8802‐3: 1000BASE‐SX 850 3.56 dB requires OF‐500

ISO/IEC 8802‐3: 1000BASE‐LX1300 2.35 dB requires OF‐5001310 4.56 dB requires OF‐2000

ISO/IEC 8802‐3: 100BASE‐FX 1300 11 dB requires OF‐2000ISO/IEC 14165‐111: Fibre Channel (FC‐PH) @1062 Mbit/sec,

850 4.0 dB requires OF‐5001310 6.0 dB requires OF‐2000

Channels… consists  of 1 or more links + equip. /patch cords

OF‐300 / OF‐500 / OF‐2000Multi M. (max.300m/500m/2000m)

850 2.55 / 3.25 / 8.5

dB1300 3.25 / 2.25 / 4.5

OF‐300 / OF‐500 / OF‐2000Single M. (max. 300m/500m/2000m)

1310 1.8 / 2.0 / 3.51500 1.8 /  2.0 / 3.5

Links The loss limit is dependent on λ,  length and connector/splice count. (min. 3 Components)

ComponentFiber

OM1/ ‐2/ ‐3/850 3.5

dB / km1300 1.5OS1 / OS2 both 1.0 / 0.4

Splice all all 0.3 dB / SpliceConnector all both 0.75/0.5/0.35 100% / 95% / 50%

Requirement for Field Testing

ISO/IEC only

TRC (Test Reference Cord)& Random Connector @ Link Ends

850/1300 0.3dB / Connection

1310/1500 0.5TRC & TRC

(periodic Check)850/1300 0.1

dB / Connection1310/1500 0.2

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Region Channel / Link / Component ‐ Requirements Field Testing Requirements

International • ISO/IEC 11801 2002 AMD2 (2009)Information technology – Generic cabling for customer premises

• ISI/IEC 24702…‐ Generic Cabling for Industrial premises

• ISO/IEC 24764…‐ Generic Cabling for Data center premises 

• ISO/IEC 15018…‐ Generic cabling for homes

ISO/IEC 14763‐3 (June 2006)Information technology – Implementation and operation of customer premises cabling – Part 3: Testing of optical fiber cabling.

Europe EN 50173‐x ”Family” Amd AB:2010Information technology ‐ Generic cabling systems• 50173‐1…Part 1: General requirements• 50173‐2...Part 2: Office premises• 50173‐3…Part 3: Industrial premises• 50173‐4…Part 4: Homes• 50173‐5…Part 5: Data Centers

EN 50346:2002 A2:2009Information technology ‐ Cabling installation – Testing of installed cabling.(Refers to 14763‐3 for all technical details)

USA ANSI/TIA‐568‐C.0‐2009Generic Telecommunications Cabling forCustomer PremisesC.1 Commercial Building ….C.2 Balanced Twisted‐Pair …Components StandardsC.3 Optical Fiber Cabling  … Components Standard

ANSI/TIA‐455‐78‐B‐2002, Optical Fibers Part 1‐40: Measurement Methods and Test Procedures – Attenuation

ANSI/TIA/EIA‐455‐8‐2000, Measurement of Splice or Connector Loss and Reflectance Using an OTDR

Standards Overview

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40/100 GbE Fiber Applications40GBASE‐SR4 40GBASE‐LR4 40GBASE‐FR

Mulitmode Single Mode

Source 4 x 10Gb VCSEL 4 x 10Gb Laser 1 x 40Gb Laser

Optics Parallel Simplex

Connnector MPO LC (or similar)

Wavelenght 850 nm 1271‐1331 nm 1550

Fiber OM3 OM4 OS2 OS2

Max Distance 100 m 150 m 10,000 m 2,000m

Loss Budget 1,9 dB 1,53 dB 6.7 dB 4.0 dB

100GBASE‐SR10 100GBASE‐LR4 100GBASE‐ER4

Mulitmode Single Mode

Source 10 x 10Gb VCSEL 4 x 10Gb Laser 1 x 40Gb Laser

Optics Parallel Simplex (4λ@ 25Gb)

Connnector MPO LC (or similar)

Wavelenght 850 nm 1300 nm (DWDM)

1550 nm (DWDM)

Fiber OM3 OM4 OS2 OS2

Max Distance 100 m 150 m 10,000 m 40,000m

Loss Budget 1,9 dB 1,53 dB 8.3 dB 18 dB

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40/100GBase‐SR/LR/ER: Which ISO Channel supports it ?

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Low Loss MPO …The Drivers

• “Zoned Data Centers” 

Distributor in accordance with ISO/IEC 11801

Network access cabling system

Main distribution cabling system

Zone distribution cabling system

Equipm.  cabling 

Courtesy: TE Connectivity

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Standard Methods

TIA‐568‐C

Tier‐1 Tier‐2

ISO 11801 AMD.1 / ISO/IEC 14763‐3

BASIC Test Regime EXTENDED Test Regime

LSPM: Light  Source & Power Meter OTDR: Optical Time Domain Reflectometer

Fiber Optic Test Methods

• The two methods are complimentary !– OTDR based method does not replace the LSPM based solution

• Both methods have advantages and limitations

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OLTS … Optical Loss Test System

• Measures a duplex fiber in both directions1. Measures the length2. Calculates the length dependent loss limit3. Measures the insertion loss4. Calculates  the margin

• Optional 2nd step: Measure both fibers in the duplex link in both directions

LSPM versus OLTS

LSPM … Light Source & Power Meter

• Measures the insertion loss of a fiber path

• Length Dependent Limits and Margins need to be calculated manually

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Losses at splices and connectors, including test equipment connectors:

NOTE: Coupling loss is the dominating contributor to the the overall link loss in premise and Data Center cabling

Sources of Attenuation: Coupling Losses

• Area mismatch

• Spacing loss

• Axis misalignment

• Angular misalignment

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Reference Methods 

1 JumperMethod B

2 JumperMethod A

3 JumperMethod C

• Test Reference Cords are not mandatory by TIA• Most manufacturers demand the most accurate 1 jumper method• The one jumper method always require a “non critical” connection on the meter• Other methods need to be used if the meter does have an ICA or if 

the link different end‐faces on either end– There is a benefit to use a “Modified Method B” overcome the lack of an ICA.

#3 #2#1

#2#1

#1

#1

#2Link Under Test

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Accuracy of the three reference methods

1 JumperMethode B

2 JumperMethode A

3 JumperMethode C

#3 #2#1

#2#1

#1

Cords /Ref. Method 1 Jumper 2 Jumper 3 Jumper

Reg. Patch Cords n

Test ReferenceCords

Hi risk of negative loss results !

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• Encircled Flux (EF) is a way to define launch conditions…the final piece in the puzzle to reducing measurement uncertainty in the field.  

• This is important because uncertainty is the enemy of ever tightening loss budgets!

Encircled Flux ‐Reducing multimode uncertainty

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Source 1Over filled

Source 2Restricted  or Under filled

Optical Source launch conditions impact the consistency and repeatability of Loss Measurements!!

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• Different light sources may have different launch conditions• Previous standards for launch conditions, in the past CPR 

(Coupling Power Ratio) and since 2006 MPD (Modal Power Distribution)  (like MFM2) allowed for too much variation

Why the NEW EF STANDARD is NEEDED

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How is the launch condition verified ?

CPR (Coupling Power Ratio) Pre 2006

MPD (Mode Power Distribution) Since 2006

EF (Encircled Flux) New

Principle: • A filter makes the light “visible” for the camera• The image is saved as a TIFF file• SW is used to evaluate the distribution of light within the fiber

Principle: • A filter makes the light “visible” for the camera• The image is saved as a TIFF file• SW is used to evaluate the distribution of light within the fiber

The power is compare with and without a 9μm cord with 30mm mode filer inserted

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MPD vs. EF Relationship

Two EF compliant light sources+ #1 @ Under Filled Limit+ #2 @ Over Filled limit… may cause a variation of 10% 

Two MPD compliant light sources+ #1 @ Under Filled Limit+ #2 @ Over Filled Limitmay cause a variation of 40% 

Area of Interest Subject to 

Fiber Miss‐Alignment

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• Use an external mode conditioner instead of mandrels 

How to make The Field Test EF compliant

100% EF compliant costly … 1k€ / pair

retrofits legacy testers

clumsy, bulky

Multiple versions: SC, LC, ST, etc…

No retrofit of worn plugs

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Encircle Flux  Common Questions From Customers

Q & A

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“The DTX‐MFM2 is MPD compliant which allows for a variation of 40% in test results. Does that also apply for the DTX‐MFM2 & Mandrel”

1. The DTX‐MFM2 uses tuned light sources and 850nm/1300nm combiners2. The same instrument used to verify EF compliance is used to ensure a very 

narrow band of variation in modal distribution3. The variation shown is less then between two compliant but marginal EF 

compliant light sources

Q&A: What is the variability of DTX‐MFM2 &    Mandrels ?

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• When that LC connector breaks orwears out, it cannot be re‐terminatedin the field

• Re‐terminations need to be verified for EF compliance

• No minimum number of mating can be quote and wear tear will greatly depend on treatment and handling– Abrasive dust can destroy a brand new plug

Q&A: Can I replace the plug on an EF controller ?“ Can I replace the plug at the end on an EF controller and how many test can I perform ”

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1. For the same reason the use of “Sacrificial Cords” dose not work EF is not assured at the end of the test cord

2. What would be needed is an “EF Transparent Cord” for this to work

Q&A: Can a EF Controller Be Integrate Into The Light Source ?

“ Why is the function of the EF controller not integrated into the light source? ”

Sacrificial cord

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• Some believed the source should be a VCSEL –– Some standards used to allow them… – Some out of date project specifications require them…

• Reasoning– Use the same source type as the active equipment

• Problem– The optical loss limits in IEEE 802.3 are based on test equipment using 

LEDs, same for ANSI/TIA and ISO/IEC– VCSELs are under filled – results in optimistic “best case” readings  – Launch condition varies greatly from source to source

Q&A: Could / Should one test wit a VCSEL?

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• Note 1): Within the uncertainty of a EF based measurement• Note 2): Only if the FAIL was with a slim margin

Q&A: What if I Use a DTX‐MFM2 & Mandrel Instead Of EF Controller ?

()

Retest 1)

Retest

Retest (2)

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1. A Light Source with an EF compliant output2. An “EF Transparent TRC”• ... at an affordable price• … with TRC performance • … without a clumsy and heavy package

Wish LIST FOR EF COMPLIANT FIELD TESTING

?? ??

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40/100 Gb/sIEEE 802.3ba

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MPO - Future Proof Technology …Migration 10 – 100Mbps

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Reuse the same MPO Trunk Cable

1G or 10G Cabling

40G Cabling

100G Cabling

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Polarity ‐MPO/MTP System Type A

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Polarity ‐MPO/MTP System Type B

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Polarity ‐MPO/MTP System Type A, B & C

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Polarity ‐MPO/MTP System “Other”

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How were MPO fibers being tested until today?

Set Reference

Install Fan‐out

Test 12 timesComplex

TediousIncompletePolarity?

Test to Limit?

Documentation?

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Wish List For a MPO/MTP Field Tester

1. Testing of all fibers in the link in one go2. Non critical MPO connector on the meter to 

support the most accurate one jumper method

3. Switchable MPO source to verify polarity – System A, B, C, …. – Field terminated connectors

4. MPO Test Reference Cords with reference grade connectors

– A definition for reference grade MPO connectors !

5. EF Compliant Light Source

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Trunk Cable Installation: Loss and Polarity Measurement –Setting the Reference (1 jumper if possible)

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Trunk Cable Installation: Loss and Polarity Measurement

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MPO/MTP Power Meter

MPO optical interface for 12 fibersMPO optical interface for 12 fibers

Power or loss on 12 fibers simultaneouslyPower or loss on 12 fibers simultaneously

Individual power or loss on single fiberIndividual power or loss on single fiber

Save power or loss measurements to LinkWareSave power or loss measurements to LinkWare

Report polarity per TIA‐568‐C.0Report polarity per TIA‐568‐C.0

Indicate if loss limit is exceeded.Indicate if loss limit is exceeded.

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MPO/MTP Light Source

MPO optical interface for 12 fibersMPO optical interface for 12 fibers

Scan All automatically sources all fibersScan All automatically sources all fibers

Auto  encodingAuto  encoding

Stabilized optical signal on each fiberStabilized optical signal on each fiber

User selectable individual channelsUser selectable individual channels

Scan All enables polarity per TIA‐568‐C.0Scan All enables polarity per TIA‐568‐C.0

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10 …100 Gb/sTrouble Shooting

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Trouble Shooting• Phase 1: The test with a Light Source & 

Power Meter identifies marginal/failing links and channels– MPO: The problematic fiber is 

identified

• Schritt2: An OTDR identifies the problematic connection– A “Fan‐Out” cable adapts SC to MPO

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Example: Localizing the  “Bottle Neck”

• The total loss of 1.98dB is within the limit• The bottle neck is after 260m

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Example : Correcting The Problem & Checking The Result

• The problem was solved by cleaning or swapping components• The bottle neck after 260m was eliminated

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Thank you for your attention!

Questions?

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