Distributed electrical cross device, and system and method thereof for implementing sub-network connection (snc) cascade protection

A system for a distributed electrical cross apparatus implementing a sub-network connection (SNC) cascade protection, comprising:

• a distributed electrical cross apparatus and a protection switching controller, wherein, the distributed electrical cross apparatus comprises two pairs of single-boards in which functions and service access conditions are completely symmetrical, and the two pairs of single-boards further connect with line-side service sub-networks in four directions respectively while supporting add/drop paths of client-side services;
• and
• the single-board in the distributed electrical cross apparatus is configured to monitor work conditions of other single-board devices connected with this single-board and work conditions of access services of this single-board, and when the single-board device and/or the access service has a fault, report a fault alarm signal to the protection switching controller;
• and execute changing a service electrical cross connection configuration of an electrical cross unit;
• the protection switching controller is configured to notify a related single-board to change the service electrical cross connection configuration of the electrical cross unit according to the fault alarm signal reported by the single-board, so that the work of the single-board with the fault is replaced by the single-board in which the single-board functions and the service access conditions are completely symmetrical with that of the single-board with the fault.

A method for a distributed electrical cross apparatus implementing a sub-network connection (SNC) cascade protection, comprising:

• setting two pairs of single-boards in which functions and service access conditions are completely symmetrical in the distributed electrical cross apparatus, and the two pairs of single-boards further connecting with line-side service sub-networks in four directions respectively while supporting add/drop paths of client-side services;
• each single-board monitoring work conditions of other single-board devices connected with this single-board and work conditions of access services of this single-board;
• when the single-board device and/or the access service has a fault, the single-board reporting a fault alarm signal to a protection switching controller;
• the protection switching controller notifying a related board to change a service electrical cross connection configuration of an electrical cross unit according to the fault alarm signal reported by the single-board;
• the related single-board executing changing the service electrical cross connection configuration of the electrical cross unit.