Signal frame processing method and related device

A method comprising:

• receiving a first signal frame, wherein a payload area of the first signal frame bears a target service, and an overhead area of the first signal frame comprises a node quantity field, the node quantity field indicating a first quantity of nodes through which the target service has passed during transmission of the target service;
• determining, based on the node quantity field, the first quantity of nodes;
• increasing the first quantity by 1 to obtain a second quantity, and updating the node quantity field of the first signal frame based on the second quantity;
• and
• sending the first signal frame having the updated node quantity field;
• and
• wherein the first signal frame is an optical service unit frame, the optical service unit frame comprises an overhead subframe and a data subframe, the data subframe bears the target service, and the overhead subframe comprises the node quantity field;
• or
• wherein the first signal frame is a flexible tributary unit frame, and the flexible tributary unit frame comprises a plurality of payload blocks, and an overhead area of at least one payload block in the plurality of payload blocks comprises the node quantity field.

An optical transport system, comprising a source node, an intermediate node, and a sink node, wherein

• the source node is configured to:
• receive a target service;
• map the target service to a first signal frame, wherein a payload area of the first signal frame bears the target service, an overhead area of the first signal frame comprises a node quantity field, the node quantity field indicating a quantity of nodes through which the target service has passed during transmission of the target service, and set a value of the quantity to 1;
• and
• send the first signal frame;
• the intermediate node is configured to:
• receive the first signal frame;
• determine, based on the node quantity field, a first quantity of nodes through which the target service has passed during transmission;
• increase the first quantity by 1 to obtain a second quantity, and update the node quantity field of the first signal frame based on the second quantity;
• and
• send the first signal frame having the updated node quantity field;
• and
• the sink node is configured to:
• receive the first signal frame having the updated node quantity field;
• determine the second quantity based on the node quantity field;
• and
• perform delay compensation on the target service based on the second quantity;
• and
• wherein the first signal frame is an optical service unit frame, the optical service unit frame comprises an overhead subframe and a data subframe, the data subframe bears the target service, and the overhead subframe comprises the node quantity field;
• or
• wherein the first signal frame is a flexible tributary unit frame, and the flexible tributary unit frame comprises a plurality of payload blocks, and an overhead area of at least one payload block in the plurality of payload blocks comprises the node quantity field.

A method comprising:

• receiving a signal frame, wherein a payload area of the signal frame bears a target service, and an overhead area of the signal frame comprises a keep alive field, the keep alive field indicating that the target service is in an active state;
• and
• determining, based on the keep alive field, that the target service is in the active state;
• and
• wherein the signal frame is an optical service unit frame, the optical service unit frame comprises an overhead subframe and a data subframe, the data subframe bears the target service, and the overhead subframe comprises the keep alive field;
• or
• wherein the signal frame is a flexible tributary unit frame, and the flexible tributary unit frame comprises a plurality of payload blocks, and an overhead area of at least one payload block in the plurality of payload blocks comprises the keep alive field.