In recent years, my country’s Internet business has developed rapidly. With the rapid development of emerging services such as 4K video, VR, and the Internet of Things, the backbone network traffic is growing rapidly. There are great uncertainties in the business of the future network, and the traffic is expected to grow rapidly. Therefore, it is necessary to divert the traffic more efficiently. Optical Transport Network (OTN) the traditional ring network is not suitable for the future network structure. To cope with the future development trend, the network structure needs to be optimized to realize the mesh (Mesh) connection of most nodes. Therefore, the problems faced by future network construction are mainly that the capacity of a single node is not enough, it needs to face multiple directions, and the scheduling speed is slow. In recent years, researchers have proposed an OTN cluster solution to solve the problems of insufficient capacity of OTN sites and difficulties in multi-directional planning. The OTN cluster is to interconnect each service frame of OTN through the switching structure to form an OTN site resource pool, make full use of resources, increase the capacity of nodes, and realize the multi-dimensionality of the site.
The OTN cluster equipment 2 + 8 mode adds a switching frame to the original service frame. Each service frame is connected to the switching frame, and boards of different service frames can be cross-connected through the switching frame without blocking. There are two types of cross-connect disks in the OTN cluster system, which are respectively applied to the service frame and the switching frame. The cross-connect boards of the service subrack and the switching subrack are connected through high-speed optical modules. Assuming that each service frame supports 32 service slots, the maximum access capacity of a single slot is 500 G, the service access capability of OTN non-clustering, that is, the access capacity of a single service frame is 16 T, and 2 + 8 clusters support a total of service slots The number of bits is 256, and the total service access capacity is 128 T. It can be found that if the OTN cluster system solution is adopted, the service access capacity will be significantly improved.
In a 2+8 cluster system, one service enclosure can support 32 service disks, and 8 service enclosures have a total of 256 service disks, which are marked as service disk chips 1-256. At the same time, one service enclosure supports 8 cross-connection disks, each cross-connection disk contains two cross-connection modules A and module B, 8 service enclosures have a total of 128 cross-connection modules of the service enclosure, and one switching enclosure supports 16 cross-connection disks, each cross-connection disk contains One cross-connect module, a total of 32 switch subrack cross-connect modules. The cross-connect module of one service disk is connected to all the cross-connect modules of the eight cross-connect disks of the service enclosure through the backplane, and one cross-connect module of switch enclosure 1 and one cross-connect module of switch enclosure 2 is connected to one service enclosure through optical modules A cross module for a cross disk. One cross-connect module in each service subrack and one cross-connect module in each switching subrack form a switching plane. Therefore, there are 16 switching planes in OTN cluster 2+8 mode.
With the rapid growth of bandwidth requirements and the continuous evolution of service network structures, OTN networks need to be optimized and adjusted accordingly. This article analyzes the crossover technology of the OTN cluster system, and the OTN cluster system can be realized by cooperating with the service disk and the line disk. The OTN site resource pool is implemented in the form of an OTN cluster to solve the problems of single-node large capacity, multi-directional and fast scheduling. With the development of cloud services, the traffic between data centers will increase greatly in the future. In such large-capacity scheduling application scenarios, clusters provide more slots and share power consumption density, which solves the problem of large-capacity OTN equipment. The contradiction between capacity growth and deployability.
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