Contributed Article
The optical distribution community (ODN) is a point-to-multipoint passive optical community (PON), as proven in FIG. 2-1. The ODN is an optical transmission channel from an optical line terminal (OLT) in a central workplace (CO) to a number of optical community items (ONUs) on the consumer facet.
In conventional ODN building, the feeder optical cables, distribution optical cables, and drop cables are stripped or terminated onsite for fiber connection. In each OSP and ISP eventualities, cable distribution bins have to be opened earlier than optical cable set up and connection.
It’s troublesome to watch the normal ODN sources in actual time as a result of the ODN is passive. At the moment, the normal ODN sources are managed primarily by the use of guide onsite recording with paper labels. Subsequently, issues corresponding to troublesome fault finding and delayed replace of upkeep info exist within the information entry and useful resource upkeep phases, inflicting heavy workloads and low effectivity. Even faults and errors brought on by information info deviation could happen. As the size of the broadband entry community will increase, the normal ODNs face a collection of challenges in functions.
Within the conventional ODN, the connection standing of optical ports within the cable distribution field is normally labeled on patch cords and recorded in a chart hooked up to the field. The set up and upkeep personnel manually report the connection standing on website and enter the knowledge into the system afterwards. After long-term O&M, the paper labels could fall off or severely fade, inflicting disordered port scheduling and failing to type out the connections with the patch cords. In line with survey statistics, the accuracy of optical port info manually recorded by some carriers outdoors China is decrease than 70%.
As well as, as a result of the optical ports of the standard ODN distribution field are usually not related to the ONUs/ONTs of customers, after the customers apply for community exit, info indicating launch of the optical ports can’t be fed again to the useful resource administration system in a well timed method. Because of this, the cables are nonetheless related however the consumer gadgets have been eliminated. The useful resource silence price of some carriers outdoors China reaches as much as 10% to twenty%, losing the preliminary building funding. Even some feeder and distribution optical cables additionally have to be reconstructed after useful resource silence, lowering the effectivity of the funding within the optical community building.
Inaccurate ODN connection info has at all times been a serious problem for carriers. The normal O&M will depend on guide operations and has many issues. Subsequently, strict processes and specs are required to enhance the useful resource administration accuracy.
Tips on how to resolve the bottleneck of the normal ODNs would be the focus of analysis on digital and clever ODNs. Subsequently, to deal with the challenges confronted by the normal ODN building and well being administration, digital and clever administration is required for the next-generation ODNs.
Because the fiber infrastructure, the ODN is probably the most advanced and expensive a part of fiber to the house (FTTH) building. Tips on how to scale back the development and O&M difficulties has been a steady analysis subject within the trade. Primarily based on the trade consensus, three generations are outlined for various evolution phases of the digital and clever ODN answer, as proven within the following determine.
A digital and clever ODN system connects the OLT and ONUs by means of digital and clever ODN {hardware}, and connects to the carriers’ operation assist system (OSS, together with the useful resource administration system and fault administration system) within the upstream course, to gather optical path info from the ODN community, restore the optical path topology, and demarcate and find faults. The next determine reveals the place of the digital and clever ODN system on the community.
The digital and clever ODN system consists of the bodily label, digital and clever ODN system, clever optical path sensing system, clever administration terminal, clever administration system, and dumb useful resource assortment and management module. It helps interconnection with the third-party OSS system. The next determine reveals the reference mannequin of the digital and clever ODN.
The development of the digital and clever ODN contains reconstruction of the normal ODN and new deployments. The next determine reveals the practical entity mannequin within the conventional ODN reconstruction situation.
The next determine reveals the practical entity mannequin within the new deployment situation.
At the moment, the industrial digital and clever ODN applied sciences belong to ODN 2.0, and the ODN 3.0 know-how continues to be within the R&D part. The next describes the ODN 2.0 answer and its functions. The digital and clever ODN is a passive ODN community that’s extremely automated and clever by way of exact useful resource administration and quick service provisioning by introducing new applied sciences corresponding to digitalization and synthetic intelligence (AI) all through its lifecycle, together with planning, building, acceptance, O&M, and upkeep. It improves the O&M effectivity and high quality. The next determine reveals the necessities for community digitalization all through the ODN lifecycle.
In conventional networking of digital and clever ODNs, an clever optical path sensing system, optical path switching system (OSW), and optical coupler are deployed on the OLT facet, and an clever digital optical splitter with the cut up ratio of 1:4 or 1:8 is put in within the level-1 FDT.
In new deployment eventualities of QuickConnect ODNs, every hyperlink consists of a Hub Field, a number of Sub Bins, and one Finish Field (all of them have a built-in clever digital optical splitter). The onsite building process is identical as that of conventional QuickConnect gadgets, with out extra processes or necessities. On this approach, clever O&M might be applied in coordination with the clever optical path sensing system and OSW system on the OLT facet, to assist distant acceptance and fault demarcation and finding, as proven within the following determine.
Within the reconstruction eventualities for QuickConnect ODN networking, as a result of the shell of the QuickConnect product can’t be opened, exterior clever digital optical cables or fiber adapters can be utilized to improve the optical splitters on the dwell community in order that the optical splitters have digital-intelligent capabilities to assist clever O&M, distant acceptance, and fault demarcation and finding, thereby implementing dwell community reconstruction, as proven within the following determine.
The next determine reveals the CO migration for OLT improve when the clever optical path sensing system and optical path swap unit are put in within the OLT subrack.
The ODN is a crucial a part of a fiber bandwidth community. The normal ODN can not meet the necessities of high-quality improvement of fiber broadband networks as a result of lengthy building interval, excessive deployment value, troublesome fiber administration, and gradual troubleshooting. Subsequently, the digital and clever ODN has grow to be the ODN evolution course as a result of cost-effective deployment, environment friendly administration and O&M, and simplified connections.
Primarily based on the applied sciences corresponding to identification of department optical strains, QuickConnect, and uneven optical splitting of optical splitters, the digital and clever ODN options automated setup of community topology, real-time monitoring of the road standing, versatile scalability, simple building and upkeep, and exact useful resource administration, thereby implementing visualized administration of entry community sources all through the lifecycle.
