FIELD: radio engineering, communication.
SUBSTANCE: invention can be used to realise an optical channel data unit (ODU) shared protection ring (SPRing). The method includes steps where: a first ODU of a first service transmitted in an optical line is taken as a protection granularity, where the first ODU is an ODUk that is directly multiplexed to the optical line; the first ODU is monitored, and a monitoring result is obtained; when the monitoring result indicates a failure, switching is performed through cross-connection of a second ODU of the first service, where the second ODU is an ODUm that is multiplexed to the first ODU, and m is smaller than or equal to k.
EFFECT: high speed of switching protection.
15 cl, 13 dwg
