Message transmission method, apparatus, and system

A message transmission method, comprising:

• receiving a first message, wherein the first message comprises:
• a first message type identifier field, used to identify a type of the first message;
• a message length field, used to identify a length of a fragment carried in the first message;
• an action indication field, used to identify whether the fragment carried in the first message is the last fragment;
• a first fragment sequence number field, used to identify a sequence number of the fragment carried in the first message;
• and a message content field, used to carry a fragment in multiple fragments, wherein the multiple fragments are obtained after physical layer operation, administration and maintenance (PLOAM) information between an optical line terminal (OLT) and an optical network unit (ONU) is fragmented;
• and
• when the action indication field identifies that the fragment carried in the first message is the last fragment, searching the message length field, the message type identifier field, and the fragment sequence number field;
• and reassembling, according to a sequence of sequence numbers of fragments that are identified in the fragment sequence number field, first messages having same types identified in the message type identifier field, to obtain the PLOAM information between the OLT and the ONU.

An optical line terminal (OLT), comprising:

• a processor;
• and
• a memory coupled to the processor and storing processor-readable instructions which when executed causes the processor to implement operations including:
• obtaining physical layer operation, administration and maintenance (PLOAM) information between the OLT and an optical network unit (ONU);
• fragmenting the PLOAM information, to obtain multiple fragments;
• generating a first message, wherein the first message comprises:
• a first message type identifier field, used to identify a type of the first message;
• a message length field, used to identify a length of a fragment carried in the first message;
• an action indication field, used to identify whether the fragment carried in the first message is the last fragment;
• a first fragment sequence number field, used to identify a sequence number of the fragment carried in the first message;
• and a message content field, used to carry a fragment in the multiple fragments;
• and
• sending the first message.

An optical network unit (ONU), comprising:

• a processor;
• and
• a memory coupled to the processor and storing processor-readable instructions which when executed causes the processor to implement operations including:
• receiving a first message, wherein the first message comprises:
• a first message type identifier field, used to identify a type of the first message;
• a message length field, used to identify a length of a fragment carried in the first message;
• an action indication field, used to identify whether the fragment carried in the first message is the last fragment;
• a first fragment sequence number field, used to identify a sequence number of the fragment carried in the first message;
• and a message content field, used to carry a fragment in multiple fragments, wherein the fragment in the multiple fragments is a fragment in the multiple fragments that are obtained after physical layer operation, administration and maintenance (PLOAM) information between an optical line terminal (OLT) and the ONU is fragmented;
• and
• when the action indication field identifies that the fragment carried in the first message is the last fragment, searching the message length field, the message type identifier field, and the fragment sequence number field, and reassemble, according to a sequence of sequence numbers of fragments that are identified in the fragment sequence number field, first messages having same types identified in the message type identifier field, to obtain the PLOAM information between the OLT and the ONU.