nd at s best practices for single mode tier i ii testing 01-2011
DESCRIPTION
Single mode Tier I & II testingTRANSCRIPT
OTDR Selection & OperationOTDR Selection & Operation
OTDR Selection & Operation ClassOTDR 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
OTDRConnection or splice reflectivity
OTDRConnection or splice insertion loss
OTDRLink “baseline trace”
Tier 2 -- Going beyond the minimumTier 2 -- Going beyond the minimum
Tier 1 -- RequiredTier 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
Tier 1 vs. Tier 2 testing…Tier 1 vs. Tier 2 testing…
• 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 definedTier 1 Testing defined
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 MeterOLTS: Light Source and Power Meter
IL (dB)
PIN
POUT
OTDR FeaturesOTDR Features
• 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)…
Distance
PIN
POUT
C1
S1
C3
Fiber
TIER 2 (OTDR)
C2
RelativePower (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 linkOpening the black box to see our link
• 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 2Single event Single event
LaunchCable Link
ReceiveCable
Fiber Rings are used as launch & receive cables
Network with fibers rings addedNetwork with fibers rings added
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 advantageThe OTDR advantage
OTDR’s perform functions an OLTS can’tOTDR’s perform functions an OLTS can’t
Baseline Trace
Connector Checking
FaultLocation
Break
Expected traceActual trace
OTDR TraceReport
Loss
Connection
But don’t throw away your OLTS !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
OFL 280
C-860 Test SetM700
M200
Noyes OTDR models…Noyes OTDR models…
OFL280 FlexTester - Value PropositionOFL280 FlexTester - Value Proposition
M200 features: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
OFL280 FlexTester - Value PropositionOFL280 FlexTester - Value Proposition
OFL 280 features: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
FRONT
OTDR(1310/1550 nm)
Optical PowerMeter (OPM) Visual Fault Locator
(650 nm)
Tool-freebattery door
Bale
PaddedCarry Handle(side-panel)
Power Input18 VDC
(side-panel)
2nd USB Drive Port(in protected slot)
USB Host &
function ports
VFL & OPM standard on all models
M700 Top/Rear Panel FeaturesM700 Top/Rear Panel Features
M700 – QUAD & SM OTDRM700 – 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
Introducing the C-seriesIntroducing the C-series
QUAD OLTS & QUAD OTDRQUAD 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
FRONT
OTDR SM MM
Visual Fault Locator (650 nm)
Tool-freebattery door
Bale
PaddedCarry Handle(side-panel)
Power Input18 VDC
(side-panel)
2nd USB Drive Port(in protected slot)
OLSSM MM
OPM
USB Host &
function port
VFL & OPM standard on all models
C850 Top/Rear Panel FeaturesC850 Top/Rear Panel Features
Tier 1 Pass/Fail using Auto-Test from C860
Complete Network CertificationComplete Network Certification
TestModes
Utilities
M700 Main MenuM700 Main Menu
Back, Menu,and Tab touch keys
Menus and test results are
displayed hereSoft Keykey labelsand touch keys
Page nameand status
SK1 SK2 SK3 SK4 SK5
Battery status
M & C series Typical PageM & C series Typical Page
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 SettingsTest Mode Settings
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 RangeSelecting the correct test Range
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)Selecting the correct Pulse Width (PW)
Example of 140km fiber run with correct range & PWExample of 140km fiber run with correct range & PW
M200 with fiber rings attachedM200 with fiber rings attached
Normal C850 traceNormal C850 trace
C850 trace with bad connectorC850 trace with bad connector
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)Selecting the correct Averages (Time)
• 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 OTDRHow to set up & test with an OTDR
Idealized trace of a reflective event at the
shortest pulse width, PMIN.
PMIN
Real OTDR trace.
0.5 dB
Event Dead Zone
Attenuation Dead Zone
1.5 dB
Event and Attenuation Dead ZonesEvent and Attenuation Dead Zones
Selecting the correct OTDRSelecting 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
OTDR selections by marketOTDR 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 QUADSuitable 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
Measurement Range Dynamic Range - 6 dB (always specified at PMAX)
DynamicRange
MeasurementRange
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
PMAX Backscatter level at OTDR test port
Calculating Measurement Range from Dynamic RangeCalculating Measurement Range from Dynamic Range
OTDR comparison chartOTDR comparison chart
NOYES OTDR's - ALL ModelsAll 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 NOAvailable 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 NOCertification OTDR w/ Large 6.5" Display 850/1300/1310/1550
- 22/22/26/26dB
8-17-10 Rev J
Thank you!Thank you!
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