Distributed electrical cross device and system and method thereof for realizing SNC cascade protection

Abstract

The invention discloses a distributed electrical cross device and a system and a method thereof for realizing SNC cascade protection, and the device comprises a back plate and at least four veneers integrated with electrical cross units; the veneers are inserted into limited slots on the back plate and provided with circuit side service access units, client side service access units and back plate access units. In the invention, circuit side service and client side service are mounted on the same veneer, multiple service access and flexible dispatch such as circuit side service, client side service and the like can be realized in the back plate of limited slots, thus adding the function of processing multiple services of the distributed electrical cross system at a low cost. In addition, except for protection switching on subnet in fault, the invention also can perform protection switching on the veneer in fault. Due to introducing a multiplex and de-multiplex module to process subwave long-grade service, the subwave long-grade service in fault also can be protected by the invention.

Description

technical field [0001] The invention relates to the technical field of protection of an optical transmission network, in particular to a distributed electrical cross-connect device and a system and method for realizing SNC cascading protection. Background technique [0002] With the development of telecommunication networks towards packetization and broadbandization, All-IP (Internet Protocol, Internet Protocol) has become a future evolution trend of service networks. According to the forecast, within the next 5 years, the bandwidth will grow at an annual rate of more than 50%. At present, the two-layer network construction mode of IP overWDM (Wavelength Division Multiplexing) is gradually replacing the original IP over SDH (Synchronous Digital Hierarchy) no matter at the backbone level or at the metropolitan level. )overWDM's three-layer model, and the flat architecture that directly bears IP on the optical layer has become the general trend. The IPover WDM networking arc...

AI Technical Summary

Problems solved by technology

[0008] figure 1 It is a schematic diagram of subnet service dispatching and protection SNC / S (Sublayer, sub-layer) cascading system. Two network layer trail endpoints (Network layer trail endpoint) E are connected to protection switching function (Protection switching function) through connection node (Connectionpoint) C The nodes P are connected, and the four subnets are connected at a single point through two protection switching function nodes P in the network nodes. When the service of a working subnet fails, it can be replaced by the concurrent service of the protection subnet to ensure that the rest of the network The local area will not be affected, but when any protection switching node fails, the entire network will inevitably face paralysis

[0009] If the existing network nodes directly adopt the optical cross-connect system, although it can flexibly schedule and protect the client-side business and the line-side business, it is not suitable for urban The processing capacity of the edge nodes of the domain network is not too large, and the optical cross-connect system cannot realize the SNC cascade scheduling and protection of sub-wavelength services

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