Information transfer and receiving method, system, and device

An information receiving method, comprising:

• receiving, by an Optical Line Terminal (OLT), an upstream frame from a Long Reach-Passive Optical Network (LR-PON) device;
• and
• determining, by the OLT, an indicator of a start bit of a communication channel, and extracting Operation Administration and Maintenance (OAM) information from the upstream frame according to the indicator of the start bit, wherein the communication channel is in a guard time slot or a preamble time slot assigned for an laser of an Optical Network Unit (ONU), and the start bit is in the guard time slot or the preamble slot assigned for the laser of the ONU.

A Long Reach-Passive Optical Network (LR-PON) device, comprising:

• an establishment module, configured to determine an indicator of a start bit in a guard time slot or a preamble time slot assigned for a laser of an Optical Network Unit (ONU), and establish a communication channel in the guard time slot or the preamble time slot assigned for the laser of the ONU according to the indicator of the start bit;
• and
• a transport module, configured to insert Operation Administration and Maintenance (OAM) information of the LR-PON device into an upstream frame sent to an Optical Line Terminal (OLT) device by the LR-PON device at a position indicated by the indicator of the start bit, and transport the upstream frame to the OLT device through the communication channel established by the establishment module.

An Optical Line Terminal (OLT) device, comprising:

• a receiving module, configured to receive an upstream frame from a Long Reach-Passive Optical Network (LR-PON) device;
• and
• an extraction module, configured to determine an indicator of a start bit of a communication channel, and extract Operation Administration and Maintenance (OAM) information from the upstream frame according to the indicator of the start bit, wherein the communication channel is in a guard time slot or a preamble time slot assigned for an laser of an Optical Network Unit (ONU), the start bit is in the guard time slot or the preamble slot assigned for a laser of an ONU.