FIELD: information technology.
SUBSTANCE: in particular, the invention discloses a method of transmitting a client signal, involving, at the transmitting end, mapping a client signal to be transmitted to a corresponding low-order Optical Channel Data Unit (ODU) in a low-order ODU set, wherein low-order ODUs in the low-order ODU set have rates increased in order, and have rate correspondence relations with the client signals; mapping the low-order ODU to a timeslot of a high-order Optical Channel Payload Unit (OPU) in a high-order OPU set; and adding overhead to the high-order OPU to form an Optical Channel Transport Unit (OTU), and transferring the OTU to an Optical Transport Network (OTN) for transmission.
EFFECT: saving bandwidth of a transport channel.
13 cl, 8 dwg
