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Ethernet passive optical network time synchronization method, system and related equipment

A passive optical network and time synchronization technology, which is applied in the direction of time division multiplexing system, multiplexing system selection device, electrical components, etc., can solve the problems of complex implementation and unsupported time synchronization function, and achieve the realization of Simple, Simplified System Design Effects

Active Publication Date: 2017-09-22
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing network time synchronization protocol (such as IEEE 1588V2, etc.) can be well applied in Ethernet, but most of the ONUs in the existing EPON system do not support the time synchronization function based on IEEE 1588V2. If the IEEE1588V2 protocol is applied In the EPON system, OLT and ONU equipment need to do a lot of work from the underlying chip, hardware design and software design, and the implementation is relatively complicated.

Method used

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  • Ethernet passive optical network time synchronization method, system and related equipment
  • Ethernet passive optical network time synchronization method, system and related equipment
  • Ethernet passive optical network time synchronization method, system and related equipment

Examples

Experimental program
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Embodiment 1

[0052] In this embodiment, the Ethernet PON time synchronization method provided by this application is described from the perspective of the ONU, please refer to figure 1 , which shows a flow chart of the Ethernet passive optical network time synchronization method provided by the present application, which may include the following steps:

[0053] Step S11: the optical network unit ONU responds to the GATE message sent by the optical line terminal OLT, and extracts the local time count value of the OLT and the difference between the OLT and the Ethernet passive optical network system time from the GATE message and the RTT (round trip time, round-trip time delay) between the OLT and the ONU.

[0054] In this embodiment, the GATE message sent by the OLT carries the local time count value of the OLT, the difference between the OLT and the Ethernet passive optical network system time, and the round-trip time delay RTT between the OLT and the ONU .

[0055] The Ethernet passive...

Embodiment 2

[0063] In this embodiment, different figure 1 For another Ethernet passive optical network time synchronization method shown in the Ethernet passive optical network time synchronization method, please refer to figure 2 , figure 2 Another flow chart showing the time synchronization method for an Ethernet passive optical network provided by the present application may include the following steps:

[0064] Step S21: the optical network unit ONU responds to the GATE message sent by the optical line terminal OLT, and extracts the local time count value of the OLT and the difference between the OLT and the Ethernet passive optical network system time from the GATE message and the round-trip time delay RTT between the OLT and the ONU.

[0065] Step S22: The ONU determines that the local time count value of the OLT is the local time count value of the ONU.

[0066] Step S23: The ONU sums the local time count value of the ONU, the difference between the OLT and the Ethernet passiv...

example 2

[0085] Example 2, if Queue#0Report, Queue#1Report, Queue#2Report, Queue#3Report and Queue#4Report in the Queue#n Report field in the current REPORT message to be sent are valid, then start with Queue#5Report and start Storing the first synchronization timestamp, since the first synchronization timestamp is 8 bytes, the sum of the byte lengths of Queue#5Report, Queue#6Report and Queue#7Report is not enough to store the first synchronization timestamp, Store the remaining bytes in the first synchronization timestamp except the bytes in the unused field in the Queue#n Report field in the Pad / Reserved field of the REPORT message to be sent, for example 2 The format of the REPORT message storing the first synchronization timestamp is shown in Table 3.

[0086] table 3

[0087] area

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Abstract

The invention provides a time synchronization method for an Ethernet passive optical network. The time synchronization method for the Ethernet passive optical network comprises the steps that an ONU responds to a GATE message sent by an OLT, and the local time count value of the OLT, the time difference value between the OLT and an Ethernet passive optical network system, and the RTT between the OLT and the ONU are extracted from the GATE message; the local time count value of the OLT is conformed to be the local time count value of the ONU; the local time count value of the ONU, the time difference value between the OLT and the Ethernet passive optical network system, and the RTT / 2 are added, the result obtained after the local time count value of the ONU, the time difference value between the OLT and the Ethernet passive optical network system, and the RTT / 2 are added serves as a first synchronization timestamp of the ONU, and then time synchronization between the ONU and the Ethernet passive optical network system is completed. As a result, the time synchronization method for the Ethernet passive optical network has the advantages that system design is simplified, and the time synchronization method is easy to realize.

Description

technical field [0001] The present application relates to the field of Ethernet passive optical network design, in particular to a time synchronization method, system and related equipment of an Ethernet passive optical network. Background technique [0002] EPON (ethernet passive optical network, Ethernet passive optical network) system has been widely used in the field of communication due to its low cost, convenient deployment, large bandwidth, and strong scalability, and has been gradually extended to mobile backhaul, power communication, etc. , automation, industrial Ethernet and other applications. [0003] The EPON system is mainly composed of three parts: OLT (optical line terminal, optical line terminal), optical splitter and ONU (optical network units, optical network unit). OLT is generally located in the computer room and is used to aggregate services to remote servers; ONU is generally located in application sites such as corridors and factory buildings to comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04J3/06
Inventor 马平金乃正乔义松张磊高钧利邵炜平
Owner STATE GRID CORP OF CHINA