Passive optical network port switching method, optical line terminal and optical network system

Abstract

The embodiment of the invention discloses a passive optical network port switching method, an optical line terminal and an optical network system. The method comprises the following steps: acquiring the adjustment parameters from a main optical line terminal port; adjusting the data frame head and the clock phase of a spare optical line terminal port corresponding to a same optical network unit ONU to be consistent with the main optical line terminal port according to the adjustment parameters; and when the main optical line terminal port or a main optical fiber has a failure, replacing the main optical line terminal port with the spare optical line terminal port which has the adjusted data frame head and clock phase. Correspondingly, the embodiment of the invention provides an optical line terminal and an optical network system. The technical proposal provided by the embodiment of the invention can realize the rapid switching between the main port and the spare port when a network failure occurs.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a passive optical network port switching method, an optical line terminal and an optical network system. Background technique [0002] PON (Passive Optical Network, Passive Optical Network) technology is a point-to-multipoint optical fiber access technology. With the continuous development of technology, EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network) and GPON ( Gigabit passive Optical Network, gigabit capacity passive optical network). In PON, the protection switching mode needs to be configured. Taking GPON as an example, GPON has two protection modes: main fiber protection switching mode and optical fiber full protection switching mode. Among them, the main fiber protection switching mode is commonly used in the industry. [0003] see figure 1 , is a schematic diagram of the trunk optical fiber protection switching mode in the prior ar...

AI Technical Summary

Problems solved by technology

[0005] When implementing active-standby switchover of optical network ports while allowing ONUs to go offline, because each optical network unit ONU has its own EqD (Equalization Delay, equivalent delay), and the length of optical fiber between EqD and OLT and ONU Therefore, the switching in this case needs to update EqD, resulting in a relatively long switching time; when implementing the active-standby switchover of the optical network port under the condition that the ONU is not allowed to go offline, the length of the active and standby optical fibers is required to be completely equal so that The frame headers of the main and standby ports are exactly the same, so it is difficult to implement

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