Method and apparatus for switching line bandwidth of optical transport network

An apparatus for switching a line bandwidth of an optical transport network (OTN), wherein the apparatus is used in a network device in the optical transport network, and wherein the apparatus comprises:

• a non-transitory memory storage comprising computer-executable instructions;
• and
• one or more processors, wherein the one or more processors execute the computer-executable instructions to cause the apparatus to perform operations comprising:
• switching an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth, wherein a bandwidth of the substructure is a specified value, and a difference between the first bandwidth and the second bandwidth is a multiple of the specified value, and wherein one of the following occurs:
• 1) Wherein the switching an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth comprises:
• determining a second OTN frame, wherein the second OTN frame is a frame with a third bandwidth, and wherein the second OTN frame is generated by the network device based on first service data from a client-side device according to a second encapsulation protocol;
• switching a bandwidth of a third encapsulation protocol from the first bandwidth to the second bandwidth at a granularity of the specified value;
• mapping a payload of the second OTN frame to payloads of substructures of the first OTN frame according to the third encapsulation protocol;
• mapping an overhead of the second OTN frame to an overhead of the first OTN frame according to the third encapsulation protocol;
• and
• filling the substructures of the first OTN frame with invalid bytes according to the third encapsulation protocol, wherein, in each substructure of the first OTN frame, a ratio of corresponding overhead or corresponding invalid bytes to corresponding payload is a fixed ratio;
• or
• 2) Wherein the first OTN frame is generated by the network device based on the first service data from the client-side device according to another encapsulation protocol, and wherein the switching an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth comprises:
• switching a bandwidth of the another encapsulation protocol from the first bandwidth to the second bandwidth at a granularity of the specified value;
• mapping the first service data to payloads of substructures of the first OTN frame according to the another encapsulation protocol;
• and
• filling the substructures of the first OTN frame with an overhead or invalid bytes according to the another encapsulation protocol, wherein in each substructure of the first OTN frame a ratio of corresponding overhead or corresponding invalid bytes to corresponding payload is a fixed ratio;
• and
• encapsulating, as an encapsulated frame with the second bandwidth, the first OTN frame with the second bandwidth according to a first encapsulation protocol;
• and
• sending the encapsulated frame with the second bandwidth at an optical layer.

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• switching, by a network device in an optical transport network (OTN), an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth, wherein a bandwidth of the substructure is a specified value, and a difference between the first bandwidth and the second bandwidth is a multiple of the specified value, and wherein one of the following occurs:
• 1) Wherein the switching, by a network device, an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth comprises:
• determining, by the network device, a second OTN frame, wherein the second OTN frame is a frame with a third bandwidth, and wherein the second OTN frame is generated by the network device based on first service data from a client-side device according to a second encapsulation protocol;
• switching, by the network device, a bandwidth of a third encapsulation protocol from the first bandwidth to the second bandwidth at a granularity of the specified value;
• mapping, by the network device, a payload of the second OTN frame to payloads of substructures of the first OTN frame according to the third encapsulation protocol;
• mapping, by the network device, an overhead of the second OTN frame to an overhead of the first OTN frame according to the third encapsulation protocol;
• and
• filling, by the network device, the substructures of the first OTN frame with invalid bytes according to the third encapsulation protocol, wherein, in each substructure of the first OTN frame, a ratio of corresponding overhead or corresponding invalid bytes to corresponding payload is a fixed ratio;
• or
• 2) Wherein the first OTN frame is generated by the network device based on the first service data from the client-side device according to another encapsulation protocol, and wherein the switching, by a network device, an OTN frame from a first bandwidth to a second bandwidth at a granularity of a substructure to generate a first OTN frame with the second bandwidth comprises:
• switching, by the network device, a bandwidth of the another encapsulation protocol from the first bandwidth to the second bandwidth at a granularity of the specified value;
• mapping, by the network device, the first service data to payloads of substructures of the first OTN frame according to the another encapsulation protocol;
• and
• filling, by the network device, the substructures of the first OTN frame with an overhead or invalid bytes according to the another encapsulation protocol, wherein in each substructure of the first OTN frame a ratio of corresponding overhead or corresponding invalid bytes to corresponding payload is a fixed ratio;
• and
• encapsulating, by the network device and as an encapsulated frame with the second bandwidth, the first OTN frame with the second bandwidth according to a first encapsulation protocol;
• and
• transmitting, by the network device, the encapsulated frame with the second bandwidth at an optical layer.