Method for detecting long luminance ONU in passive optical network

Abstract

The invention discloses a method for detecting long luminance ONU in a passive optical network, which comprises that: a signal TX_RSSI transmitted by an optical module is detected after an ONU is normally powered up, and the signal TX_RSSI indicates that whether an optical signal is transmitted in the optical module; when the signal TX_RSSI indicates that the optical signal is output, the ONU judges whether high-level retention time of the signal TX_RSSI exceeds the minimum polling cycle of the passive optical network; and if the high-level retention time of the signal TX_RSSI exceeds the minimum polling cycle of the passive optical network, a GPON media access controller of the ONU transmits an ID number and a long luminance alarm to an OLT through an OMCI channel, and the ONU cuts off the transmission of the optical module by cutting off a transmitting power supply VCC_Tx of the optical module. The method for detecting the long luminance ONU in the passive optical network directly monitors light path signals, eliminates long luminance faults to the full extent, and can cut off the long luminance ONU and accurately report the alarm information, and improves the reliability of thedevice.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for detecting a long-emitting ONU (Optical Networks Unit) in a passive optical network (Passive Optical Networks, PON). Background technique [0002] In the GPON (Gigabit Passive Optical Networks) system, the optical line terminal OLT (Optical Line Terminal) connects multiple optical network units ONU (Optical Networks Unit) through the optical distribution network ODN (Optical Distribution Network). The uplink from the ONU to the OLT adopts the TDMA method, and all uplink data transmissions are controlled by the OLT. The OLT only allows one ONU to send upstream data at the same time. In order to avoid conflicts between ONUs, the OLT allocates different time slots to each ONU according to the bandwidth requirements of the ONUs. The ONU can only send upstream data in its own time slots, such as figure 1 As shown, the time slots of ONU1, ONU2, ONU3...ONUn are respec...

AI Technical Summary

Problems solved by technology

[0004] First: In this solution, the serializer / deserializer (SerDes) and the media access controller (MAC) are separated in order to detect the clock lock signal, which greatly increases the cost of the device and is unnecessary

[0005] Second: Another shortcoming of this solution is that it cannot overcome the long-term lighting problem caused by the optical module itself. It can only solve the long-term open problem of the optical module due to the failure of the PON MAC (Media Access Controller) circuit. question

[0006] Third: If there is a long-emitting ONU, there is no alarm indication on the OLT side, and the fault location cannot be achieved

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