To improve network bandwidth, it is not enough to rely solely on FTTH. The metropolitan area network must provide end-to-end large bandwidth to ensure smooth traffic and improve user experience. The best choice for metropolitan area network speed is OTN. As the content of people's online experience shifts from text to audio, video and other streaming media, bandwidth demand has increased and impacted on metropolitan area networks. How to improve network bandwidth has become an important issue for the construction or transformation of metropolitan area networks. After all, the scale deployment of FTTH is only to solve the last mile problem, and the metropolitan area network is a big convergence ratio network, just as every household has cars to improve the travel conditions, but the road traffic conditions are not synchronized, and when they go out, they are congested, and people are again Return to the state of inconvenient transportation. Therefore, FTTH is only the first step, and the metropolitan area network must provide end-to-end large broadband to solve the problem of traffic jams when going out, ensuring smooth traffic and improving user experience. The need for metro end-to-end broadband construction To improve the QoS of the metropolitan area network, it is a good optimization method to connect the BRAS/SR directly to the core router (flattening). However, due to the fading of the aggregation router, the BRAS/SR drives directly to the core router, and the distance is extended, which brings various challenges: the core layer of the cable/pipe needs pressure; the fiber/pipe end-to-end coordination is difficult, the fiber fusion The workload is increased; network fault location is difficult; BRAS/SR/CR and other devices often require long-distance optical modules, which greatly increases the cost of network construction; the core router 40G port self-organizing network is weak, and the fiber direct drive cannot be satisfied. After the introduction of OTN to help flatten the metro broadband network, these problems can be solved: a fiber has 80 & TImes; 40/100G capacity, which greatly reduces fiber consumption and reduces the pressure on the cable pipeline; Optical fiber and splicing fiber meet the needs of rapid service opening; router/BRAS only needs short-range optical module to transmit on OTN network. Of course, the number of BRAS/SR rooms in a large city is large. It requires a backbone and a two-layer OTN network architecture to achieve good coverage and flexible scheduling. In small and medium-sized cities, because there are not many BRAS/SR rooms, a few aggregation rings can complete the coverage, so there is no need for a backbone network (the backbone layer is simplified to two central nodes). There are also some cities with high BRAS deployment locations. Therefore, the number of BRAS/SR rooms is small, and the backbone OTN network networking is simple, but the OLT uplink networking is relatively complicated. The network between the OLT/DSLAM and the BRAS is often built in the "fiber direct drive + L2" mode to meet the network needs of the small bandwidth era. However, as the network speed continues to increase, a GE port uplink cannot meet the OLT/DSLAM requirements, and often requires 2/4 & TImes; GE bundles provide bandwidth and requires more fibers, so the fiber/optic cable pressure doubles. From the traffic point of view, the bandwidth of n&TImes;GE uplink is relatively saturated, and then the convergence of L2 convergence is not great, so L2 positioning gradually blurs or even exits. From the business point of view, the introduction of services such as VoIP/IPTV/VOD has promoted the deployment of multi-edge gateways. The OLT/DSLAM uplink requires more optical fibers, which further increases the pressure on the optical cable from the optical direct drive network construction mode. Therefore, the access layer network needs to introduce OTN to realize the transmission between OLT/DSLAM and BRAS/SR, alleviate the pressure of continuously expanding optical cable, provide optical layer network protection, improve network security, and provide users with higher quality network experience. . On the other hand, the same data plane comprehensively carries a variety of services, bringing tremendous pressure to the core layer. At present, some cities in China have deployed the second plane of data to meet these services, and continue to optimize the original plane to meet the development needs of the original Internet business. However, in the case of parallel development of the first and second planes, the construction mode of direct fiber drive will undoubtedly lead to the rapid shortage of strategic resources such as optical fiber, pipelines, optical junction boxes and other operators. Therefore, it is imperative to introduce metro OTN construction. . At present, most of the domestic BRAS deployment locations are relatively low, and basically only one OTN access ring is required to implement OLT/DSLAM uplink access. In an individual city, the BRAS deployment location is high, and an access ring and an aggregation ring two-layer network are required to implement OLT/DSLAM uplink access. Therefore, whether the BRAS is high-level or low-hanging determines the complexity of the requirements for accessing the OTN network. The need for large bandwidth high-end private lines With the rapid increase of home bandwidth, users' sensory experience of streaming media is continuously strengthened, which makes the individual's dependence on video continue to increase. At the same time, it also promotes the company's private line business from pure text and voice form, and gradually turns to rich special lines such as electronic whiteboard and conference TV. Business, these businesses have significantly reduced the cost of business travel, and have made positive contributions to low-carbon environmental protection. The enrichment of enterprise private line services will require the rapid increase of enterprise bandwidth, which will prompt the enterprise's dedicated line bandwidth to be upgraded, bid farewell to the original FE port, and gradually evolve to GE port. Currently, the metropolitan area network that serves enterprise leased lines has only two modes: SDH network and router networking. Due to QoS and security issues, router networking is generally not selected by enterprise high-end private lines. SDH networks can provide physical isolation, absolute QoS guarantee, and perfect network protection. These are important requirements for high-end private lines. Therefore, the existing high-end private lines of enterprises are mostly based on the opening of SDH network. However, the SDH network bandwidth supply capability is limited, and it is difficult to meet the needs of a large number of GE and above large bandwidth private lines. The QoS and network security of the data network dedicated line cannot be guaranteed. The OTN network can be deployed with end-to-end wavelength and sub-wavelength services to meet the requirements of large bandwidth, high QoS, high network security, and physical isolation. It is the best technology choice for high-bandwidth high-end private lines. Jiangsu Stark New Energy was founded in 2018. It is an emerging new energy manufacturer and trader. Our company focuses on the integration and research and development of household energy storage systems. The Energy Storage System integrates our company`s lithium iron phosphate battery packs. 48V 51.2V batteries are connected in series and parallel to meet the requirements for battery voltage and capacity.
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