| CPC H04L 1/0057 (2013.01) [G06F 11/0709 (2013.01); G06F 11/076 (2013.01)] | 20 Claims |

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1. A bit error indication method, comprising:
receiving, by a network device, a first signal stream from a first node by using N slots of a first bonding group, wherein the first signal stream comprises a first check code for determining a quantity of bit errors comprised in the first signal stream, the first bonding group comprises P physical layer (PHY) links, a bandwidth resource of each PHY link is divided into Q slots, a bandwidth resource of the first bonding group is divided into P*Q slots, N is less than or equal to P*Q, and N, P, and Q are all integers greater than or equal to 1;
determining, by the network device, a first check value indicating the quantity of bit errors comprised in the first signal stream based on the first check code, determining a second check value based on the first check value and a current check value, and updating the current check value by using the second check value, wherein the current check value is a check value stored by the network device before receiving the first signal stream; and
sending, by the network device, a second signal stream to a second node by using M slots of the first bonding group, wherein the second signal stream comprises a second check code, the second check code comprises a target check value, the target check value is determined based on the second check value, the target check value is less than or equal to a preset threshold, and M is an integer greater than or equal to 1.
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