| CPC G06F 11/0772 (2013.01) [G06F 11/0754 (2013.01); H04L 1/0045 (2013.01)] | 16 Claims |

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12. An operation method of a communication system, comprising:
calculating, by a transmitting device, an original verification information unit of each of a plurality of data units comprised in a data unit stream;
transmitting, by the transmitting device, the data unit stream to a data channel of a communication interface;
transmitting, by the transmitting device, the original verification information units corresponding to the data units to a verification information channel of the communication interface based on a transmission timing of the data units in the data channel, wherein the data channel and the verification information channel are different channels of the communication interface;
receiving, by a receiving device, the data units of the data unit stream from the data channel of the communication interface;
receiving, by the receiving device, the original verification information units corresponding to the data units from the verification information channel of the communication interface; and
after receiving a current data unit among the data units and before receiving a next data unit among the data units, verifying, by the receiving device, whether the current data unit received from the data channel has errors in real time based on a current original verification information unit corresponding to the current data unit in the original verification information units,
wherein the transmitting device comprises:
a coding layer circuit configured to generate the data units;
a physical layer circuit coupled to the coding layer circuit to receive the data units and configured to transmit the data unit stream comprising the data units to the receiving device through the data channel of the communication interface; and
a verification circuit coupled to the coding layer circuit to receive the data units, wherein the verification circuit uses the data units to calculate the original verification information units corresponding to the data units, the verification circuit outputs the original verification information units to the physical layer circuit, and the physical layer circuit transmits the original verification information units to the receiving device through the verification information channel of the communication interface.
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