Patent ID: 8798079

Claim:
A method for fast passing through services in a synchronous digital hierarchy device, comprising: a protection switching module compressing plural first pass-through time slots between adjacent protection ports to one second pass-through time slot, wherein, the step of the protection switching module compressing the plural first pass-through time slots between the adjacent protection ports to the one second pass-through time slot comprises: when compressing the plural first pass-through time slots to the one second pass-through time slot, taking an input position and an output position of a first one of the plural first pass-through time slots as an input position and an output position of the one second pass-through time slot, resetting a cross level of the one second pass-through time slot, and taking the number of the plural first pass-through time slots to-be-compressed as a cascade number of the one second pass-through time slot; and when an action of pass-through is triggered, the protection switching module sending the one second pass-through time slot to a time slot configuration module to parse, and the time slot configuration module sending a parsing result to a time slot register to perform a process of a time slot pass-through.