Optical line terminal equipment, protection method and passive optical network system

Abstract

The embodiment of the invention provides optical line terminal equipment, a protection method and a passive optical network system. The equipment comprises a main processing board, a standby processing board and a main optical interface, wherein the main processing board comprises a main processing module used for carrying out PON protocol layer processing and service processing; the standby processing board comprises a standby processing module used for carrying out PON protocol layer processing and service processing; and the main optical interface comprises an optical module used for converting optical signals into electrical signals or converting electrical signals into optical signals. The electrical signals are transmitted between the main / standby processing boards and the main optical interface, and the optical signals are transmitted between the main optical interface and an optical network unit. The standby processing board backs up the equalization delay of the main processing board corresponding to the optical network unit in the PON system, and when the main / standby processing boards are switched, the equalization delay of the main processing board is used as the equalization delay of the standby processing board. The optical line terminal equipment and the protection method of the passive optical network according to the embodiment of the invention can fully utilize the current optical distribution network and reduce the protection switching time.

Description

technical field [0001] Embodiments of the present invention relate to a passive optical network (Passive Optical Network; PON), and in particular to an optical line terminal (Optical Line Terminal; OLT) device and protection method in the PON and a PON system. Background technique [0002] With the rise of services such as video-on-demand, high-definition TV, and online games, users' demand for network bandwidth is increasing. Passive optical network (PON) technology can effectively guarantee the access bandwidth of the "last mile", and has become an optical It is one of the mainstream technologies of the access network. figure 1 A schematic block diagram of a typical PON system architecture is shown. Such as figure 1 As shown, the PON includes an optical line terminal (OLT), an optical network unit (Optical Network Unit; ONU) and an optical distribution network (Optical Distribution Network; ODN). The OLT is located at the central office, and the ONU is located at the us...

AI Technical Summary

Problems solved by technology

However, due to the different transmission delays on the active and standby paths, all ONUs need to re-range when switching from the main path to the standby path. The more ONUs, the longer the protection switching time

Moreover, the PON line terminal (OLT) is directly connected to the optical fiber, so that when the main optical fiber is intact but the OLT fails, the backup OLT must also be used while the standby optical fiber is enabled. Different standby paths make the protection switching time longer

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