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Method for identifying abnormality of optical line terminal, and optical network unit

A technology of optical network unit and optical line terminal, applied in the field of passive optical network, can solve the problems affecting ONU data transmission, rogue, conflict, etc.

Active Publication Date: 2019-03-05
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the subsequent data transmission, the two ONUs will respond to the same upstream bandwidth transmission command, thus conflicting and affecting the data transmission of other normal ONUs, forming a rogue ONU phenomenon

Method used

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  • Method for identifying abnormality of optical line terminal, and optical network unit
  • Method for identifying abnormality of optical line terminal, and optical network unit
  • Method for identifying abnormality of optical line terminal, and optical network unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] For an ONU in the "stealth" state, technically speaking, the ONU is in the O5 state and can normally receive, parse and synchronize the downlink broadcast frames sent by the OLT in the downlink direction, but the OLT will not send uplink transmissions for it due to abnormalities command, so no data can be transmitted upstream, so the ONU will wait forever.

[0055] Suppose ONU A is in O5 state. ONU A can normally receive, analyze and synchronize the downlink broadcast frame sent by OLT in the downlink direction in the O5 state, but has not received the uplink transmission command that the OLT allocates uplink transmission bandwidth for it, set the timer T1 in ONU A, and refer to figure 1 , perform the following steps:

[0056]Step S110: ONU A starts timer T1 when entering the O5 state;

[0057] Step S120: ONU A monitors whether it receives an uplink transmission instruction that the OLT allocates uplink transmission bandwidth for it before the timer T1 times out;

...

Embodiment 2

[0064] Assume "stealth" ONU A ID = XX. When a new ONU (such as ONU B) is powered on and registered online, the OLT may assign ONU-ID=XX to ONU B. At this time, there are two ONUs with the same ONU-ID XX in the network. In the subsequent data transmission, ONU A and ONU B will respond to the same upstream transmission command, thus conflicting and affecting the data transmission of other normal ONUs, forming a rogue ONU phenomenon.

[0065] refer to figure 2 , the solution is as follows:

[0066] Step S210: ONU A waits to receive an Assign-ONU-ID message sent by the OLT in the O5 state, and at this time ONU A is in the message acquisition state. If received, turn to step S220;

[0067] Wherein, the message carries the identification ONU-ID'=XX and the number SN' of the ONU B allocated by the abnormal OLT for the newly registered ONU B.

[0068] Step S220: ONU A parses the received Assign-ONU-ID message, and compares the SN' and ONU-ID' in the message with its own factory-...

Embodiment 3

[0081] In the XG-PON system, the factory configuration of ONU A is SN=0x12345678, and the assigned ONU-ID is 101. At this time, the OLT loses the status data of ONU A due to an abnormality. At this time, ONU B (SN=0x98765432) registers and goes online.

[0082] ONU A waits to receive the Assign-ONU-ID message sent by the OLT in the O5 state, and the received message is as follows:

[0083] ONU-ID

0x03FF broadcast message

message type

0x03,"Assign-ONU-ID"

serial number

0xDD

ONU-ID'

101

SN'

98765432

filling

0000

Check Digit

check

[0084] Table 1

[0085] Then, ONU A parses the received Assign-ONU-ID message, and compares the SN'=98765432 and ONU-ID'=101 in the message with the factory configuration SN=0x12345678 and the assigned ONU-ID=101 respectively , when it is judged that SN'≠SN and ONU-ID'=ONU-ID, an alarm message (duplicate allocation of ONU-ID) is generated.

[0086] Next, ONU A receives ...

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PUM

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Abstract

The invention discloses a method for identifying the abnormality of an optical line terminal, and an optical network unit, and relates to the field of passive optical networks. The method comprises the following steps: receiving, by the optical network unit, a message sent by the optical line terminal for allocating an optical network unit identifier, wherein the message carries an optical networkunit serial number and the optical network unit identifier, if the optical network unit serial number in the message is compared to be inconsistent with the optical network unit serial number of thepresent optical network unit, and the optical network unit identifier in the message is consistent with the optical network unit identifier of the present optical network unit, judging repeated allocation abnormality of the optical network unit identifier in the optical line terminal, and getting offline. Therefore, the problems of invisible ONUs and rogue ONUs is solved.

Description

technical field [0001] The invention relates to the field of passive optical network (Passive Optical Network, PON), in particular to a method for identifying an abnormality of an optical line terminal and an optical network unit. Background technique [0002] Passive optical network technology has been widely deployed. At present, the optical line terminal (OLT) device will maintain status data for the online optical network unit (ONU) device it manages, including: ONU status, resource data (such as parameters such as ONU-ID specified in the standard protocol). [0003] However, during operation, due to software and hardware design defects or device implementation problems, the OLT equipment may be abnormal and lose the data of a certain ONU A (ONU-ID=XX), and accordingly it is considered that the ONU A does not exist, but Actually the ONUA is still online. According to standard requirements, this type of ONU A device will always synchronize and analyze the downlink broad...

Claims

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Application Information

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IPC IPC(8): H04L12/26
CPCH04B10/07H04L43/08
Inventor 张德智蒋铭沈成彬
Owner CHINA TELECOM CORP LTD