Instalaciones de fibra optica en entornos de centro de datos y campus para suportar 40, 100G y mas Jim Davis Regional Marketing Engineer Fluke Networks
Agenda Inspection and Cleaning Loss Budgets TIA (Cabling) vs IEEE (Application) Loss Testing Best practice to reduce uncertainty 3 jumper reference for MPO cable testing with OLTS OTDR Testing - Troubleshooting MPO Trunks Results management Cloud based services
INSPECTION, AND, IF NECESSARY, CLEANING (REPEAT AS NEEDED)
#1 Problem: Dirt! Contaminated connector end-faces: Leading cause of fiber link failures Particles of dust and debris trapped between fiber end faces cause signal loss, back reflection, and damaged equipment Many Sources of contamination: Equipment rooms & Telecommunication rooms in filthy environments Improper or insufficient cleaning tools, materials, procedures Debris and corrosion from poor quality adapter sleeves Hands of technicians Airborne 4
Video Microscopes for Inspection Protect your one good eye A variety of tips available Patch Cord and Bulkhead Auto Centering and Auto Focus options Ability to store images Can be used to compare against standard
Automated Analysis IEC 61300-3-35 IEC 61300-3-35 ED.2 MM Zone Name Scratches Defects A: Core (0-65µm) B: Cladding (65-115µm) No Limit 3 µm None > 3 µm No Limit 5 µm None > 5 µm 4 5 µm None > 5 µm No Limit < 5 µm 5 From 5-10 µm None > 10 µm C: Adhesive No Limit No Limit D: Contact (135-250 µm) No Limit No Limit < 20 µm 5 30 µm None > 30 µm
Inspect Clean - Inspect
Inspect Clean - Inspect
Inspect Clean - Inspect
If Dry Clean fails, try Wet Clean
Pass!
MPO Inspection & cleaning Requires special adapter for microscope Two axis camera is easier even for 12 fiber connections Second knob on tip allows centering of fibers
MPO Inspection & cleaning Cleaning is more important than ever With large contact surface, any contaminants can cause and air gap and this leads to reflectance problems Example of a dirty MPO end face
The cover lifts to insert MPO connectors You may put a drop of solvent on the cleaning tape
MPO Inspection & cleaning That fiber from the earlier slide is clean now Example of a cleaned MPO end face
Tier I testing is loss, length, and polarity Is there enough light coming out of the fiber for the receiver to detect? Is the transmission on the right (left) fiber?
A Test Result! Yes! 17
A Test Result! What Test Limit was Passed? TIA Length Based Limit for Multimode Fiber 18
How Fiber Loss is Measured Set a reference Run a test Find the difference
First set a reference Then find the Difference Optical Loss Measured Direct connection (No bulkhead adapter!) All connections are included in the loss measurement
Why not 2 jumper reference? Sadly, most folks are setting a reference this way? db Issues You have no idea what the loss is in the adapter Whatever it is, it s subtracted from your measurement The uncertainty is horrendous negative loss
What is done today Let s take an example 0.75 db Issues You have no idea what the loss is in the adapter Whatever it is, it s subtracted from your measurement The uncertainty is horrendous negative loss
What is done today Let s take an example 0.3 db 0.1 db 0.3 db Measurement = 0.3 + 0.1 + 0.3 0.75 = -0.05 db Issues You have no idea what the loss is in the adapter Whatever it is, it s subtracted from your measurement The uncertainty is horrendous negative loss
Example of Negative Loss Bad test results do not accept!
Accurate test process and values will reduce uncertainty For less uncertainty in our fiber testing, especially of multimode fiber, there are 4 key ingredients to loss testing A one jumper reference An LED source Reference Grade Connectors Encircled Flux compliance 25
Accurate test process and values will reduce uncertainty For less uncertainty in our fiber testing, especially of multimode fiber, there are 4 key ingredients to loss testing A one jumper reference An LED source Reference Grade Connectors Encircled Flux compliance LED Source VCSEL Source 26
Accurate test process and values will reduce uncertainty For less uncertainty in our fiber testing, especially of multimode fiber, there are 4 key ingredients to loss testing A one jumper reference An LED source Reference Grade Connectors Encircled Flux compliance < 0.10 db of loss per mated pair <0.20 db for Single-Mode 27
Encircled Flux compliance The light source s launch condition determines how and where the light is distributed within the fiber Cladding Core Source 1 Over filled Source 2 Under filled Source 3 EF Compliant
Encircled Flux Improves Precision EF compliant = just enough light Measure the right loss Passes good links Fails bad links Overfilled = too much light near the edge Measures high loss Fails good links Underfilled = not enough light near the edge Measures low loss Passes everything
CALCULATING A LOSS BUDGET Difference between a TIA limit and an application limit The Loss Budget determines what Passes and Fails
There is no Cat 6A for fiber Which Limits to use? Does this link really pass? There is conflict between what the standard will support and what the application requires Installers should use Custom Limits to certify links Cabling Standards: TIA 568 ISO 11801 Application Standards: 1000BASE-T 10GBASE-T Application Standards: 1000BASE-T 10GBASE-T
There is no Cat 6A for fiber Which Limits to use? Does this link really pass? There is conflict between what the standard will support and what the application requires Installers should use Custom Limits to certify links Manufacturers may offer a custom link loss calculator for their components Cabling Standards: TIA 568 ISO 11801 Application Standards: 10GBaseSX 40GBase-SR4
IEEE 802.3ba (100 Gig) Fiber Channel Performance Requirements Per Table 87-14 Maximum Channel Insertion Loss = 6.7 db at 1310 nm Maximum Length = 10 Km Per 87.11.2.2 6.7 db at 1310 nm Maximum Discrete Reflectance shall be less than -26 db
TIA Limits Vs. IEEE limits 1 km 0.75 0.75 Cabling Standards: TIA 568 ISO 11801 Per TIA: # Connectors * 0.75 db KM of fiber * 1 db/km (Tight Buffered) # Splices * 0.30 db In this example 1.5 + 1 + 0 = 2.5 db Total Loss Budget Measured Loss = 2 db Pass for both TIA and IEEE Application Standards: 10GBaseLX 40GBase-LR4
TIA Limits Vs. IEEE limits 1 km 0.75 0.75 Cabling Standards: TIA 568 ISO 11801 Per IEEE: Less than 6.7 db of loss, less than 10 KM of length In this example 6.7 db Total Loss Budget Measured Loss = 5 db Pass but only for IEEE Application Standards: 10GBaseLX 40GBase-LR4
Using a TIA limit without understanding the application Customer wants to run 10GBASE-SR on this multimode link 0.75 db 0.75 db 0.75 db 0.90 db @ 850 nm (300 m) 0.75 db TIA (tester) Limit = 0.75 db + 0.75 db + 0.90 db + 0.75 db + 0.75 db = 3.90 db @ 850 nm 10GBASE-SR Limit = 2.55 db @ 850 nm This design will not support 10GBASE-SR
Which Limits to use? Does this link really pass? That 3.90 loss budget falls within the acceptable values for the cabling standard, but outside of the acceptable values for the application Cabling Standards: TIA 568 ISO 11801 Application Standards: 10GBaseSX 40GBase-SR4 X
Using a TIA limit without understanding the application Customer wants to run 10GBASE-SR on this multimode link 0.90 db (300 m) 0.75 db 0.75 db TIA (tester) Limit = 0.75 db + 0.90 db + + 0.75 db = 2.40 db @ 850 nm 10GBASE-SR Limit = 2.55 db @ 850 nm This design will support 10GBASE-SR
Using a TIA limit without understanding the application Customer wants to run 10GBASE-SR on this multimode link 0.90 db (300 m) 0.75 db 0.75 db TIA (tester) Limit Confirm = 0.75 the db + performance 0.90 db + + 0.75 of your db MPO cassettes Many manufacturers = 2.40 db @ have 850 nm regular and High Performance or 10GBASE-SR Low Limit Loss = cassettes. 2.55 db @ Regular 850 nmmay This have design > 1 will db of support loss for 10GBASE-SR the two connections
MPO/MTP Testing with OLTS
Multi-Fiber Connectors (MPO/MTP) 12 Fiber For plug and play cassettes in datacom environment 40 Gig 16 Fiber For SAN market, where switch & director blades come in eight fiber increments 24 Fiber High density for the data center server side 100 Gig
Two options for testing MPO to MPO cables Traditional duplex field tester Dedicated MPO field tester
MPO/MTP Testing with OLTS 3 Jumper Reference
How to tell 3 jumper reference is set properly Very important for end user Look for two TRC Verifications in test results
How to tell 3 jumper reference is set properly Very important for end user Second step check 2 nd TRC and reset reference
Testing MPO to MPO cables LC LC MPO MPO Loss reported Referenced out
OTDR testing of MPO/MTP connectors
OTDR Testing of MPO Connectors Ideally you will have at least 30 Meters of Launch and Receive fibers Provided that the link under test is short Use a fan out cord or cassette to convert from Single fiber Port on OTDR 30 Meters 30 Meters Launch Fiber Receive or Tail Fiber Don t forget your Pinned/Unpinned connections!
Port Protector/Sacrificial Cord in Action 30 Meter Launch Cord 30 meter Receive cord
MPO Launch Cord and Trace 30 Meters Fan-out to MPO Launch Fiber
MPO Launch Cord and Trace MPO
All 12 fibers stacked trace
Looks easy now let s try Single Mode MPO
First check launch/receive cords 50 Meter Launch Cord 50 meter Receive cord
Detail of launch fiber verification notice Gender Changing connector and tool
Example of Fiber Switch instead of Fan Out Switch 1 x 12
The Switch helps, but makes a large event
Launch and Receive Fibers Look Good
Here are Launch Link Receive Fibers
What is happening with the First Fiber?
Is the connector dirty?
Please be sure to Inspect ALL Connectors before installing, clean them if necessary, inspect again!! Video Microscope Brand new out of bag After Cleaning 62
Documenting Results Request your test results in Native Format, not.pdf Your tester only delivers results in Paper format? Consider using a cloud based results management service Check that the reference value is correct and recent Did they verify the known good leg? Deliver the results today, not in a month While your team still has access to the site
In Conclusion Inspect and clean if necessary Follow the right process to reduce uncertainty in your measurement MPO/MTP connectors are an accepted multi-lane solution Data Centers use them extensively Tier I testing can be done with OLTS and 3 jumper reference Tier II testing can be used for troubleshooting A 12/24 fiber launch fiber and tail fibers are required Leverage the benefits of cloud based results management
Thank you, Gracias, Obrigado Jim Davis Fluke Networks Jim.Davis2@flukenetworks.com 6920 Seaway Blvd Everett, WA 98271