Patent ID: 9276690
Filing Date: 2016-03-01
CPC Classification: H04J

Claim Text:
1. A system for a distributed electrical cross apparatus implementing a sub-network connection (SNC) cascade protection, comprising: a distributed electrical cross apparatus, wherein the distributed electrical cross apparatus comprises a backboard and four single-boards, the four single-boards are inserted in fixed slots on the backboard, the four single-boards are set as two pairs of single-boards whose 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; each single-board comprises an electrical cross unit, a line-side service access unit, a client-side service access unit and a backboard access unit, wherein the electrical cross unit achieves cross connections of line-side services, client-side services and backboard-side services; the backboard access unit comprises three backboard electrical signal interaction modules and three backboard electrical signal multiplexing and de-multiplexing modules corresponding to the three backboard electrical signal interaction modules, each backboard electrical signal interaction module connects with the electrical cross unit of the single-board which the corresponding backboard access unit located through the corresponding backboard electrical signal multiplexing and de-multiplexing module; the three backboard electrical signal interaction modules in each single-board are configured to connect the single-board where the three backboard electrical signal interaction modules locates with the backboard electrical signal interaction modules of the other three single-boards; the backboard electrical signal multiplexing and de-multiplexing module is configured to decompose a backboard electrical signal into multi-path sub-wavelength electrical signals; and converge the multi-path sub-wavelength electrical signals into one path backboard electrical signal; the system further comprises a protection switching controller, wherein 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.