A method for transmitting a service signal by using an Ethernet channel performed by a communications device, wherein the Ethernet channel comprises multiple Ethernet physical coding sublayer, PCS, lanes, each Ethernet PCS lane uses a bearing area with a fixed length to transmit the service signal, and the method comprises: • allocating, by a reconciliation sublayer, RS, during a first clock cycle of a clock signal a first identifier to a first signal, thereby forming a first service identifier signal and transmitting, by the RS, the first service identifier signal and the clock signal to a first layer higher than the RS and to a second layer higher than the RS, wherein the first identifier corresponds to a first service signal; • allocating, by the RS, during a second clock cycle subsequent to the first clock cycle of the clock signal a second identifier to a second signal, thereby forming a second service identifier signal and transmitting, by the RS, the second service identifier signal and the clock signal to the first layer higher than the RS and the second layer higher than the RS, wherein the second identifier corresponds to a second service signal; • determining, by the first layer higher than the RS, that a local identifier matches the first identifier contained in the received first service identifier signal, and transmitting, by the first layer higher than the RS, the first service signal to the RS in a third clock cycle as indicated by the clock signal; • determining, by the second layer higher than the RS, that a local identifier matches the second identifier contained in the received second service identifier signal, and transmitting, by the second layer higher than the RS, the second service signal to the RS in a fourth clock cycle, different to the third clock cycle, as indicated by the clock signal (step 101); • multiplexing, by the RS, the first service signal and the second service signal to at least one bearing area, wherein one part of the at least one bearing area bears the first service signal, and the other part of the at least one bearing area bears the second service signal, wherein the at least one bearing area comprises an overhead bearing area and a payload bearing area, and the overhead bearing area bears bandwidth indication information, wherein the bandwidth indication information is used to indicate bandwidth, occupied by the first service signal, in the payload bearing area (step 102); and • transmitting, by the RS, the first service signal and the second service signal to a physical coding sublayer, PCS, of a Ethernet physical, PHY, layer that are borne in the at least one bearing area (step 103). • allocating, by a reconciliation sublayer, RS, during a first clock cycle of a clock signal a first identifier to a first signal, thereby forming a first service identifier signal and transmitting, by the RS, the first service identifier signal and the clock signal to a first layer higher than the RS and to a second layer higher than the RS, wherein the first identifier corresponds to a first service signal; • allocating, by the RS, during a second clock cycle subsequent to the first clock cycle of the clock signal a second identifier to a second signal, thereby forming a second service identifier signal and transmitting, by the RS, the second service identifier signal and the clock signal to the first layer higher than the RS and the second layer higher than the RS, wherein the second identifier corresponds to a second service signal; • determining, by the first layer higher than the RS, that a local identifier matches the first identifier contained in the received first service identifier signal, and transmitting, by the first layer higher than the RS, the first service signal to the RS in a third clock cycle as indicated by the clock signal; • determining, by the second layer higher than the RS, that a local identifier matches the second identifier contained in the received second service identifier signal, and transmitting, by the second layer higher than the RS, the second service signal to the RS in a fourth clock cycle, different to the third clock cycle, as indicated by the clock signal (step 101); • multiplexing, by the RS, the first service signal and the second service signal to at least one bearing area, wherein one part of the at least one bearing area bears the first service signal, and the other part of the at least one bearing area bears the second service signal, wherein the at least one bearing area comprises an overhead bearing area and a payload bearing area, and the overhead bearing area bears bandwidth indication information, wherein the bandwidth indication information is used to indicate bandwidth, occupied by the first service signal, in the payload bearing area (step 102); and • transmitting, by the RS, the first service signal and the second service signal to a physical coding sublayer, PCS, of a Ethernet physical, PHY, layer that are borne in the at least one bearing area (step 103).