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 person 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 packing containers must be opened earlier than optical cable set up and connection.
It’s troublesome to observe the normal ODN sources in actual time as a result of the ODN is passive. Presently, the normal ODN sources are managed primarily via handbook onsite recording with paper labels. Subsequently, issues comparable to troublesome fault finding and delayed replace of upkeep data exist within the information entry and useful resource upkeep phases, inflicting heavy workloads and low effectivity. Even faults and errors brought on by information data 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 often labeled on patch cords and recorded in a chart hooked up to the field. The set up and upkeep personnel manually file the connection standing on website and enter the data 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 kind out the connections with the patch cords. In keeping with survey statistics, the accuracy of optical port data manually recorded by some carriers exterior 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, data 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 person units have been eliminated. The useful resource silence charge of some carriers exterior China reaches as much as 10% to twenty%, losing the preliminary building funding. Even some feeder and distribution optical cables additionally must be reconstructed after useful resource silence, decreasing the effectivity of the funding within the optical community building.
Inaccurate ODN connection data has all the time been a significant problem for carriers. The normal O&M depends upon handbook operations and has many issues. Subsequently, strict processes and specs are required to enhance the useful resource administration accuracy.
The way to resolve the bottleneck of the normal ODNs would be the focus of analysis on digital and clever ODNs. Subsequently, to handle 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. The way to cut back the development and O&M difficulties has been a steady analysis matter within the trade. Based mostly 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 via 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 route, to gather optical path data 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 consists of reconstruction of the normal ODN and new deployments. The next determine reveals the useful entity mannequin within the conventional ODN reconstruction state of affairs.
The next determine reveals the useful entity mannequin within the new deployment state of affairs.
Presently, the industrial digital and clever ODN applied sciences belong to ODN 2.0, and the ODN 3.0 know-how remains to be within the R&D section. 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 when it comes to exact useful resource administration and quick service provisioning by introducing new applied sciences comparable 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 Containers, 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 units, with out extra processes or necessities. On this method, clever O&M will 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 stay 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 stay 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 change unit are put in within the OLT subrack.
The ODN is a crucial a part of a fiber bandwidth community. The normal ODN can’t 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 develop into the ODN evolution route as a result of cost-effective deployment, environment friendly administration and O&M, and simplified connections.
Based mostly on the applied sciences comparable to identification of department optical traces, 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.
