FIELD: optical signal transmission.
SUBSTANCE: invention is related to transmission of service data. The first device encapsulates the channel frame in a transmission frame, in which the channel frame is used to carry service data, and sends the transmission frame to the second device. The channel frame transmission method is a method without decapsulation between an optical transport network and an access network.
EFFECT: reduction of delay in transmission of service data.
24 cl, 13 dwg
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