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telecommunications network that broadcasts data through fibre optic cables. PONs are managed by passive optics such as unpowered splitters and filters, offering high reliability and low cost compared to active networks. The PON data stream is generally converted to a more traditional service such as
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Each upstream/downstream wavelength is capable of providing up to 10 Gbit/s symmetric bandwidth to each subscriber if the channel is not time-division multiplexed between several ONUs. With wavelength-division multiplexing on four available wavelengths, NG-PON2 can provide up to 40 Gbit/s
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lasers with a wavelength mux. The light is then filtered at each ONU with an actively tunable filter that passes only the desired downstream wavelength to its receiver. In the upstream direction, tunable lasers at each ONU are dynamically assigned to a wavelength. Fibres from all ONUs are combined
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measurements. The standard provides spectral flexibility to occupy reserved wavelengths in deployments devoid of legacy architectures. Additionally, a mux/demux used to combine and separate the NG-PON2 wavelength channels at the OLT can be designed with a coexistence element to isolate legacy
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Deployments for several downstream/upstream subscriber rates are described within the standard including 10/10 Gbit/s at each subscriber, 10/2.5 Gbit/s, and 2.5/2.5 Gbit/s. Additionally, some wavelengths are reserved for potential use in Point-to-Point applications.
193:(left), each of a different wavelength, are combined into a single fibre using a wavelength mux. Each ONU is dynamically assigned to just one OLT and communicates with tunable lasers (upstream) and active filters (downstream).
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and details an architecture capable of total network throughput of 40 Gbit/s, corresponding to up to 10 Gbit/s symmetric upstream/downstream speeds available at each subscriber.
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NG-PON2 is compatible with existing PON fibre by replacing optical line terminal (OLT) at the central office, and the optical network unit (ONU) near each end-user.
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Wavelength allocations include 1524 nm to 1544 nm in the upstream direction and 1596 nm to 1602 nm in the downstream direction.
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NG-PON2 was designed to include backwards-compatibility, or coexistence, with previous architectures to ease deployment into existing
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348:"G.989: 40-Gigabit-capable passive optical networks (NG-PON2): Definitions, abbreviations and acronyms"
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Unique to this standard is the use of both active filters and tunable lasers in the ONU.
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is provided in the downstream direction by combining light from four fixed wavelength
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is provided in the upstream direction through the use of burst lasers at each ONU.
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G.989.2 – Physical media dependent (PMD) layer specification
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The architecture calls for time- and wavelength-division multiplexing (
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232:. Wavelengths were specifically chosen to avoid interference with
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169:(G.9804 series) was released intended as successors to NG-PON2.
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The ITU-T G.989 standard is divided into these subsections:
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Optical network spectrum including the NG-PON2 wavelengths
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is a 2015 telecommunications network standard for a
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156:Ethernet and Wi-Fi at the subscriber's location.
262:G.989.1 – General Requirements
204:) in the upstream and downstream directions.
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221:throughput to the entire optical network.
151:A passive optical network is a last mile,
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138:Next-Generation Passive Optical Network 2
25:Next-Generation Passive Optical Network 2
319:"ITU brings new clarity to 5G transport"
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144:(PON). The standard was developed by
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122:https://www.itu.int/rec/T-REC-G.989
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206:Wavelength-division multiplexing
358:from the original on 2021-06-15
329:from the original on 2021-04-05
402:ITU-T G Series Recommendations
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230:optical distribution networks
213:with a passive mux/splitter.
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387:Fiber-optic communications
215:Time-division multiplexing
289:Fiber-optic communication
284:Broadband Internet access
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142:passive optical network
294:Next generation access
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397:ITU-T recommendations
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392:Network architecture
299:Hybrid fiber-coaxial
70:ITU-T Study Group 15
16:ITU-T Recommendation
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317:ITU (2018-12-22).
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173:Technical details
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104:Telecommunication
90:Related standards
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189:Light from four
167:Higher Speed PON
113:Freely available
94:Higher Speed PON
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46:Latest version
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360:. Retrieved
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331:. Retrieved
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56:Organization
38:Year started
352:www.itu.int
376:Categories
362:2021-06-15
333:2021-04-05
305:References
51:March 2020
382:Broadband
253:Standards
66:Committee
356:Archived
327:Archived
323:ITU News
278:See also
242:RF Video
134:TWDM-PON
33:In force
272:G.989.3
238:10G-PON
130:NG-PON2
118:Website
110:License
20:NG-PON2
244:, and
100:Domain
30:Status
84:G.984
80:G.983
60:ITU-T
246:OTDR
234:GPON
202:TWDM
191:OLTs
41:2015
210:OLT
146:ITU
136:),
49:1.0
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
