Methods and systems are provided for determining a shortest minimum regeneration path in an optical network. The method includes creating a virtual node at a source node, the source node communicatively coupled to a destination node through a plurality of nodes and links. The method includes traversing the virtual nodes, wherein traversing the virtual nodes comprises selecting an unvisited virtual node at a node; identifying a candidate virtual node from the unvisited virtual node; determining whether the candidate virtual node exceeds a maximum permitted weight; determining whether the candidate virtual node violates a shortest minimum regeneration path condition; and creating the new virtual node from the candidate virtual node if the candidate virtual node does not exceed the maximum permitted weight and if the candidate virtual node does not violate the shortest minimum regeneration path condition.

A method for sending a code block data stream includes adding m first data frames carrying the code block data stream to n physical layer data frames on an Ethernet physical interface. The method includes identifying a location of the first code block of each first data frame in the m first data frames using an alignment marker of a physical layer data frame in the n physical layer data frames. The method includes sending the n physical layer data frames, where m and n are integers greater than or equal to 1.

The present invention provides a method, which including: determining, by a first node, an adjustment requirement for a line interface rate; and according to the adjustment requirement for the line interface rate, adjusting, by the first node, a transport bandwidth of an optical channel (OCh) link, adjusting the number of optical channel transport lanes (OTLs) in an optical channel transport unit (OTUCn) link, and adjusting the number of optical channel data lanes (ODLs) in an optical channel data unit (ODUCn) link, where the OTL is in one-to-one correspondence with the ODL. In embodiments of the present invention, according to an adjustment requirement for a line interface rate, a transport bandwidth of an OCh link is adjusted, the number of OTLs in an OTUCn link is adjusted, and the number of ODLs in an ODUCn link is adjusted, so that the line interface rate can be dynamically adjusted.

Disclosed are a method and a node for detecting subframe misordering, including that: a receiving node receives subframes from a transmitting node, and judges whether a trail trace identifier carried in each subframe received is same with a desired trail trace identifier of a subframe to be received; when the trail trace identifier carried in each subframe received is same with the desired trail trace identifier of the subframe to be received, judges whether a subframe number value carried in each subframe belongs to a range of desired subframe number values of the subframe to be received, and if it has been judged that the subframe number value carried in the received subframe does not belong to the range of desired subframe number values of the subframe to be received, determines that there is subframe misordering.