Understanding Passive Optical Network...
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Splitter Port Loss 18 dB 64 128 21 dB 32 15 dB 8 9 dB 4 6 dB 2 3 dB Insertion loss Number of ports Typical loss = 10 log (1/nb ports) 6 12 dB Note: Cascaded splitters always induce a higher loss than a single splitter (for the same split ratio) Optical Splitter Input Outputs O 2 O 3 I 1 Understanding Passive Optical Network Testing Construction/Acceptance Testing Fiber under Test Patch Cord Copper Acceptance testing with Loss test Set/ORL meter • Connectorized splitter: Link insertion loss & ORL of the feeder part at 1310/1550 nm Link insertion loss & ORL of the distribution part at 1310/1550 nm • Spliced splitter: Insertion loss & ORL between OLT and ONT at 1310/1550 nm Loss Test Set/ORL Meter Testing Central Office 1310 nm 1490/1550 nm PON OLT Video AMP RF Video OLT-55/ORL-55 ORL/IL OLT-55/ORL-55 ORL/IL Feeder Fiber Drop Terminals Passive Splitter ONT ONT ONT ONT Distribution Fibers WDM OTDR Testing Acceptance testing with OTDR • Connectorized splitter: Link/event insertion loss & ORL of the feeder part at 1310/1550 nm Link/event insertion loss & ORL of the distribution part at 1310/1550 nm • Spliced splitter: Link/event insertion loss & ORL between OLT and ONT at 1310/1550 nm Central Office 1310 nm 1490/1550 nm PON OLT Video AMP RF Video T-BERD/MTS-4000 OTDR T-BERD/MTS-4000 OTDR T-BERD/MTS-4000 OTDR Feeder Fiber Drop Terminals Passive Splitter ONT ONT ONT ONT Distribution Fibers WDM PON Fiber Installation and frame connection When laying fiber, splicing shall be tested by OTDRs at 1310/1550 nm (bi-directional OTDR testing is recommended) Fiber Installation Fiber under Test Patch Cord T-BERD/MTS-4000 OTDR Feeder Fiber Splitter Location Distribution Fibers Drop Terminal Drop Terminal JDSU Solutions Description Construction Turn-up Troubleshooting FI-10 Fiber Identifier VFL-100 Visual Fault Locator FBP Video Probe OTS-55 Optical Talk Set OLT-55 Loss Test Set ORL-55 Return Loss Meter OLP-57 Selective PON Power Meter T-BERD/MTS-4000 OTU-8000 WDM Ethernet TDM, WDM, ATM TDM, WDM, Ethernet NG-PON1: G-PON compatible Ethernet ATM, TDM, WDM, Ethernet ATM Traffic Mode 1550 nm 1550 nm Yes, to be defined 1570 nm 1550 nm 1550 nm Video overlay Down: 1575-1580 Up: 1260-1280 Down: 1575-1580 (WDM overlay possible) Up: 1260-1280 Down: 1490 Up: 1310 Return Path: 1570 or 1610 To be defined Down : 1400 - 1500 Up: 1260 - 1360 Video overlay 1550 Down: 1480 - 1500 (WDM overlay possible) Up: 1260 - 1360 Down: 1480-1500 Up: 1260 - 1360 Wavelengths (nm) 64 (128 possible) 64 (128/256 possible) 64 64 (128/256 possible) 32 64 (128 considered) 32 Maximum number of branches 20/24/29 dB 20-30+ dB TBD Like selected PON To be defined 15/20 dB 20/25/28/ 30/32 dB 20/25/ 30 dB insertion LOSS Maximum 10/20 km 60 km max, 20 km differential 20 km 60 km max, 20 km differential 10/20 km 60 km max, 20 km differential 20 km PON Standards Up: 10 Down: 10 Up: NG-PON1/ XG-PON1: 2.5 NG-PON1/ XG-PON2: 10 NG-PON2: 10 Down: 10 Like selected G/E-PON Like selected G/E-PON Up: 1.25 May fall under NG-PON2 May fall under NG-PON2 Up: 0.155, 0.62, 1.25, 2,48 Down: 1.25 Down: 1.25 - 2.5 Down: 0.155, 0.62, 1.25 Up: 0.155-0.62 Next Gen PON 1550 nm Span Bit rates (Gbit/s) IEEE 802.3av End 2009 ITU-T G.987.x Mid 2010 IPS SP910 To be defined Applicable standard IEEE 802.3ah ITU-T G.983.x ITU-T G.984.x Understanding PON Testing To learn more, visit www.jdsu.com/fttx Note: Specifications, terms and conditions are subject to change without notice. © 2010 JDS Uniphase Corporation. All rights reserved. 30162962 000 0310 PON.PO.FOP.TM.AE o t e d i u G e v i s n e h e r p m o C A e c n a r u s s A e c i v r e S d n a , t n e m e r u s a e M , t s e T t n e m y o l p e D e c i v r e S y a l P e l p i r T We wrote the book on Triple Play Testing. Visit us online for your free copy. Loss Budget Attenuation A = αL + α s x + α c y α: attenuation coefficient of the fibre α s : mean splice loss α c : mean loss of line connectors x: number of splices y: number of line connectors L: link length When the network is in service: Downstream transmission from OLT to ONT: - Voice, data & optional IP video at 1490 nm - Optional analog video at 1550 nm Upstream transmission from ONT to OLT: - Voice & data at 1310 nm 0.4 dB 4 0.1 dB Fiber loss 1 dB Connectors 2 0.5 dB Splices 18 dB Splitter (1:64) 1 18 dB Total Loss Number/Link Loss Typical PON loss budget 10 km 1310 nm 0.35 dB/km 3.5 dB 1490 nm 0.22 dB/km 10 km 2.2 dB 10 km 1550 nm 0.2 dB/km 2 dB Total Loss 1310 nm 1490 nm 1550 nm 21.6 dB 22.9 dB 21.4 dB OTDR PON Trace 1 2 3 4 Splitter Splice Connector Launch cable 5 End of fiber 1 2 3 3 4 2 5 OTDR PON trace from the ONT with cascaded splitters PON Power Meter Meter 3 Meter 1 Meter 2 1310 nm 1490 nm 1550 nm OLP-4057 PON Power Meter Central Office PON OLT WDM Video AMP RF Video ONT 1310 nm 1490/1550 nm ONT 1310 nm 1490/1550 nm Passive Splitter Distribution Fibers Broadband Mode • Broadband power meter (780 up to 1650 nm) • Basic power level measurements (when no 1550 nm video overlay is present). Through Mode • FTTH PON power meter for turn-up and maintenance. • Simultaneous measurement at 1490, 1550 nm (downstream) and 1310 nm (upstream) • PON power meter can be inserted in through mode in a network to measure power levels (for both upstream and downstream). • The PON power meter does not affect the traffic and can be used to troubleshoot at any point in the network. Through mode capability Acronyms and Abbreviations ATM Asynchronous Transfer Mode B-PON Broadband Passive Optical Network CO Central Office DSLAM Digital Subscriber Line Access Multiplexer E-PON Ethernet Passive Optical Network G-PON Gigabit Passive Optical Network IL Insertion Loss NOC Network Operation Center OLT Optical Line Terminal ONT Optical Network Terminal ONU Optical Network Unit ORL Optical Return Loss OTDR Optical Time Domain Reflectometer PON Passive Optical Network RFoG Radio Frequency Over Glass TDM Time Division Multplexing WDM Wavelength Division Multiplexing The FI-10 identify the presence of optical signal on fiber with- out the need to open the fiber at the splice point. It detects continuous wave, live optical transmission, and 270 Hz, 1 and 2 kHz modulated tones. Visual Fault Locator is an essen- tial tool that quickly and easily locates problem areas in fiber cables. By pinpointing the exact location of fiber damage, technicians can diagnose, troubleshoot, and fix the problem efficiently. The FBP-series of video inspec- tion probes are used to inspect fiber optic connector end faces. Combined with the T-BERD/ MTS-4000 via USB, they provide fast and easy connector inspection. The OTS-55 provides clear digital voice transmission over a single fiber. Handsfree oper- ation makes communication even more convenient for technicians by using either a headset or the “speakerphone” mode. The OLT-55 performs Optical Power Measurement, Insertion Loss. It is a universal instrument for installation, maintenance and troubleshooting of single mode fiber. It can also be used as a standalone power meter or laser source. The ORL-55 Optical Return Loss Meter combines three different functions in one field-optimized instrument, including an optical return loss meter, an optical power meter, and a triple- wavelength laser source. The OLP-57 is a Selective Power Meter for testing FTTX/PON systems. Its through mode allows simultaneous measure- ment at all three wavelengths on the fiber, 1490 nm and 1550 nm downstream and 1310 nm upstream. The T-BERD/MTS-4000 is a Mutiple Services Test Platform. Its OTDR module permits to measure attenuation along the fiber, detect events, measure ORL, IL. The selective PON power meter provides power level measurements, with pass- through mode. The OTU-8000 lies at the core of JDSU optical network management system (ONMS) combining in-service OTDR and optical switch for moni- toring hundreds of fiber links. Turn-up and Troubleshooting Testing Fiber under Test Patch Cord Copper Equipment Turn-up and Troubleshooting Network Troubleshooting PON Equipment Turn-Up and Troubleshooting Before activating the network or when connecting an ONT: • Optical power measurement at the OLT (1490/1550 nm) to ensure that sufficient power is delivered to the ONTs • Optical power measurement at each splitter output • Optical power measurement at the ONT (1310/1490/1550 nm) • PON selective power meter is used to troubleshoot at any point in the network Central Office 1310 nm 1490/1550 nm PON OLT Video AMP RF Video T-BERD/MTS-4000 OTDR/PON Power Meter T-BERD/MTS-4000 OTDR/PON Power Meter T-BERD/MTS-4000 OTDR/PON Power Meter Feeder Fiber Drop Terminals Passive Splitter ONT ONT ONT ONT Distribution Fibers WDM PON Network Troubleshooting • Power level measurement with PON power meter on ONT • OTDR test from ONT or drop terminal (if a few ONTs are still responding) -> In-service OTDR (1625 or 1650 nm) • OTDR test from splitter or OLT (if no ONTs are responding) Central Office 1310 nm 1490/1550 nm PON OLT Video AMP RF Video T-BERD/MTS-4000 OTDR T-BERD/MTS-4000 OTDR Feeder Fiber Drop Terminal Passive Splitter ONT ONT ONT ONT Distribution Fibers WDM Drop Terminal PON Test System Using an OTDR, PON network can be automatically monitored in service. The level of the peak generated by the reflective termination is checked at each acquisition. The peak disappears if the fiber is cut or its level decreases in case of fiber attenuation. This system allows to check the fiber continuity from the central office up to the customer. Such a system is the only way for technicians to know if the problem comes from the physical infrastructure ( fiber, splitter, connector) or from the equipment (OLT, ONU, ONT). 1xn 1xn 1310 nm 1490 nm Central Office Serving up to 10,000 customers Switch In-Service OTDR OLT OLT WDM WDM ONT ONT x ONT n ONT 1 The peak of ONT 1 is missing 10GE-PON 10G-PON RFoG over PON Pure WDM-PON E-PON G-PON B-PON
Transcript of Understanding Passive Optical Network...
Splitter Port Loss
18 dB64
128 21 dB
32 15 dB
8 9 dB
4 6 dB
2 3 dB
Insertion lossNumber of ports
Typical loss = 10 log (1/nb ports)
6 12 dB
Note: Cascaded splitters alwaysinduce a higher loss than a singlesplitter (for the same split ratio)
Optical Splitter
Input
Outputs
O2
O3
I1
Understanding Passive Optical Network Testing
Construction/Acceptance Testing Fiber under Test
Patch Cord
Copper
Acceptance testing with Loss test Set/ORL meter• Connectorized splitter: Link insertion loss & ORL of the feeder part at 1310/1550 nm Link insertion loss & ORL of the distribution part at 1310/1550 nm• Spliced splitter: Insertion loss & ORL between OLT and ONT at 1310/1550 nm
Loss Test Set/ORL Meter Testing
Central Office
1310 nm
1490/1550 nm
PON OLT
Video AMP
RF Video
OLT-55/ORL-55ORL/IL
OLT-55/ORL-55ORL/IL
Feeder Fiber
Drop Terminals
Passive Splitter
ONT
ONT
ONT
ONT
Distribution FibersWDM
OTDR Testing
Acceptance testing with OTDR• Connectorized splitter: Link/event insertion loss & ORL of the feeder part at 1310/1550 nm Link/event insertion loss & ORL of the distribution part at 1310/1550 nm• Spliced splitter: Link/event insertion loss & ORL between OLT and ONT at 1310/1550 nm
Central Office
1310 nm
1490/1550 nm
PON OLT
Video AMP
RF Video
T-BERD/MTS-4000OTDR
T-BERD/MTS-4000OTDR
T-BERD/MTS-4000OTDR
Feeder Fiber
Drop Terminals
Passive Splitter
ONT
ONT
ONT
ONT
Distribution FibersWDM
PON Fiber Installation and frame connectionWhen laying fiber, splicing shall be tested byOTDRs at 1310/1550 nm(bi-directional OTDR testing is recommended)
Fiber Installation
Fiber under Test
Patch Cord
T-BERD/MTS-4000OTDR
Feeder Fiber
SplitterLocation
Distribution Fibers
Drop Terminal
Drop Terminal
JDSU Solutions
Description
Construction
Turn-up
Troubleshooting
FI-10 FiberIdentifier
VFL-100 Visual Fault Locator
FBP Video Probe
OTS-55 Optical Talk Set
OLT-55 LossTest Set
ORL-55 Return Loss Meter
OLP-57 Selective PON Power Meter
T-BERD/MTS-4000 OTU-8000
WDMEthernet TDM, WDM, ATM
TDM, WDM, EthernetNG-PON1:
G-PON compatible
EthernetATM, TDM, WDM, Ethernet
ATMTraffic Mode
1550 nm1550 nm Yes, to be defined1570 nm1550 nm1550 nmVideo overlay
Down: 1575-1580Up: 1260-1280
Down: 1575-1580(WDM overlay
possible)Up: 1260-1280
Down: 1490Up: 1310
Return Path: 1570 or 1610
To be defined Down : 1400 - 1500
Up: 1260 - 1360Video overlay
1550
Down: 1480 - 1500(WDM overlay
possible) Up: 1260 - 1360
Down: 1480-1500Up: 1260 - 1360
Wavelengths (nm)
64(128 possible)
64 (128/256 possible)
64 64 (128/256 possible)
3264 (128 considered)
32Maximumnumber of branches
20/24/29 dB20-30+ dB TBD Like selected PON To be defined15/20 dB20/25/28/30/32 dB
20/25/30 dB insertion LOSS
Maximum
10/20 km60 km max, 20 kmdifferential
20 km 60 km max, 20 km differential
10/20 km60 km max, 20 km differential
20 km
PON Standards
Up: 10
Down: 10
Up: NG-PON1/XG-PON1: 2.5
NG-PON1/XG-PON2: 10NG-PON2: 10
Down: 10
Like selected G/E-PON
Like selected G/E-PON
Up: 1.25
May fall underNG-PON2
May fall under NG-PON2
Up: 0.155, 0.62, 1.25, 2,48
Down: 1.25 Down: 1.25 - 2.5Down: 0.155, 0.62, 1.25
Up: 0.155-0.62
Next Gen PON
1550 nm
Span
Bit rates (Gbit/s)
IEEE 802.3avEnd 2009
ITU-T G.987.xMid 2010
IPS SP910 To be defined Applicable standard
IEEE 802.3ahITU-T G.983.x ITU-T G.984.x
Understanding PON Testing
To learn more, visit www.jdsu.com/fttxNote: Specifications, terms and conditions are subject to change without notice.© 2010 JDS Uniphase Corporation. All rights reserved. 30162962 000 0310 PON.PO.FOP.TM.AE
ot ediuG evisneherpmoC A
ecnarussA ecivreS dna ,tnemerusaeM ,tseT
tnemyolpeD ecivreS yalP elpirT We wrote the bookon Triple Play Testing.Visit us online for your free copy.
Loss Budget
AttenuationA = αL + α
s x + α
c y
α: attenuation coefficient of the fibre α
s: mean splice loss
αc: mean loss of line connectors
x: number of splicesy: number of line connectorsL: link length
When the network is in service:Downstream transmission from OLT to ONT: - Voice, data & optional IP video at 1490 nm - Optional analog video at 1550 nm
Upstream transmission from ONT to OLT: - Voice & data at 1310 nm
0.4 dB40.1 dB
Fiber loss
1 dBConnectors 20.5 dB
Splices
18 dBSplitter (1:64) 118 dB
Total LossNumber/LinkLoss
Typical PON loss budget
10 km1310 nm 0.35 dB/km 3.5 dB
1490 nm 0.22 dB/km 10 km 2.2 dB
10 km1550 nm 0.2 dB/km 2 dB
Total Loss
1310 nm 1490 nm 1550 nm
21.6 dB22.9 dB 21.4 dB
OTDR PON Trace
1
2
3
4
Splitter
Splice
Connector
Launch cable
5 End of fiber
1 2
3
3
4
2
5
OTDR PON trace from the ONT with cascaded splitters
PON Power Meter
Meter3
Meter1
Meter2
1310 nm 1490 nm 1550 nm
OLP-4057PON Power Meter
Central Office
PON OLT WDM
Video AMP
RF Video
ONT
1310 nm
1490/1550 nm
ONT
1310 nm
1490/1550 nm
Passive Splitter
DistributionFibers
Broadband Mode• Broadband power meter (780 up to 1650 nm)
• Basic power level measurements (when no 1550 nm video overlay is present).
Through Mode• FTTH PON power meter for turn-up and maintenance.• Simultaneous measurement at 1490, 1550 nm (downstream) and 1310 nm (upstream)• PON power meter can be inserted in through mode in a network to measure power levels (for both upstream and downstream).• The PON power meter does not affect the traffic and can be used to troubleshoot at any point in the network.
Through mode capability
Acronyms and Abbreviations
ATM Asynchronous Transfer ModeB-PON Broadband Passive Optical NetworkCO Central OfficeDSLAM Digital Subscriber Line Access MultiplexerE-PON Ethernet Passive Optical NetworkG-PON Gigabit Passive Optical NetworkIL Insertion LossNOC Network Operation CenterOLT Optical Line TerminalONT Optical Network TerminalONU Optical Network UnitORL Optical Return LossOTDR Optical Time Domain ReflectometerPON Passive Optical NetworkRFoG Radio Frequency Over GlassTDM Time Division MultplexingWDM Wavelength Division Multiplexing
The FI-10 identify the presence of optical signal on fiber with-out the need to open the fiber at the splice point. It detects continuous wave, live optical transmission, and 270 Hz, 1 and 2 kHz modulated tones.
Visual Fault Locator is an essen-tial tool that quickly and easily locates problem areas in fiber cables. By pinpointing the exact location of fiber damage, technicians can diagnose, troubleshoot, and fix the problem efficiently.
The FBP-series of video inspec-tion probes are used to inspect fiber optic connector end faces. Combined with the T-BERD/MTS-4000 via USB, they provide fast and easy connector inspection.
The OTS-55 provides clear digital voice transmission over a single fiber. Handsfree oper-ation makes communication even more convenient for technicians by using either a headset or the “speakerphone” mode.
The OLT-55 performs Optical Power Measurement, Insertion Loss. It is a universal instrument for installation, maintenance and troubleshooting of single mode fiber. It can also be used as a standalone power meter or laser source.
The ORL-55 Optical Return Loss Meter combines three different functions in one field-optimized instrument, including an optical return loss meter, an optical power meter, and a triple-wavelength laser source.
The OLP-57 is a Selective Power Meter for testing FTTX/PON systems. Its through mode allows simultaneous measure-ment at all three wavelengthson the fiber, 1490 nm and 1550 nm downstream and 1310 nm upstream.
The T-BERD/MTS-4000 is a Mutiple Services Test Platform. Its OTDR module permits to measure attenuation along the fiber, detect events, measure ORL, IL. The selective PON power meter provides power level measurements, with pass-through mode.
The OTU-8000 lies at the core of JDSU optical network management system (ONMS) combining in-service OTDR and optical switch for moni-toring hundreds of fiber links.
Turn-up and Troubleshooting Testing Fiber under Test
Patch Cord
Copper
Equipment Turn-up and Troubleshooting Network Troubleshooting
PON Equipment Turn-Up and TroubleshootingBefore activating the network or when connecting an ONT:• Optical power measurement at the OLT (1490/1550 nm) to ensure that sufficient power is delivered to the ONTs• Optical power measurement at each splitter output• Optical power measurement at the ONT (1310/1490/1550 nm)• PON selective power meter is used to troubleshoot at any point in the network
Central Office
1310 nm
1490/1550 nm
PON OLT
Video AMP
RF Video
T-BERD/MTS-4000OTDR/PON Power Meter
T-BERD/MTS-4000OTDR/PON Power Meter
T-BERD/MTS-4000OTDR/PON Power Meter
Feeder Fiber
Drop Terminals
Passive Splitter
ONT
ONT
ONT
ONT
Distribution FibersWDM
PON Network Troubleshooting• Power level measurement with PON power meter on ONT• OTDR test from ONT or drop terminal (if a few ONTs are still responding) -> In-service OTDR (1625 or 1650 nm)• OTDR test from splitter or OLT (if no ONTs are responding)
Central Office
1310 nm
1490/1550 nm
PON OLT
Video AMP
RF Video
T-BERD/MTS-4000OTDR
T-BERD/MTS-4000OTDR
Feeder Fiber
Drop Terminal
Passive Splitter
ONT
ONT
ONT
ONT
Distribution FibersWDM
Drop Terminal
PON Test System
Using an OTDR, PON network can be automatically monitored in service. The level of the peak generated by the reflective termination is checked at each acquisition. The peak disappears if the fiber is cut or its level decreases in case of fiber attenuation. This system allows to check the fiber continuity from the central office up to the customer. Such a system is the only way for technicians to know if the problem comes from the physical infrastructure ( fiber, splitter, connector) or from the equipment (OLT, ONU, ONT).
1xn
1xn
1310 nm
1490 nm
Central OfficeServing up to 10,000 customers
Switch
In-Service OTDR
OLT
OLT
WDM
WDM
ONT
ONT
x
ONT n
ONT 1
The peak ofONT 1 ismissing
10GE-PON10G-PON RFoG over PON Pure WDM-PONE-PONG-PONB-PON
