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Protection switching method in passive optical network, optical line terminal, and optical network device

A passive optical network and optical line terminal technology, applied in the field of optical network devices, protection switching methods and optical line terminals, can solve the problems of backup equipment cost and bandwidth waste, and achieve improved utilization efficiency, increased bandwidth, and improved system lines. effect of speed

Active Publication Date: 2022-07-12
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a protection switching method in a passive optical network, an optical line terminal, and an optical network device, so as to solve the problem of cost and bandwidth waste caused by backup equipment not working in the prior art

Method used

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  • Protection switching method in passive optical network, optical line terminal, and optical network device
  • Protection switching method in passive optical network, optical line terminal, and optical network device
  • Protection switching method in passive optical network, optical line terminal, and optical network device

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Embodiment 1

[0036] Figure 4 Among them, the working OLT is the main OLT, the backup OLT is the backup OLT, and the SNI LT refers to the service-side network interface line terminal; MUX is the multiplexing module, CT1-4 are the channel terminals, WM is the wavelength division multiplexing module, and spliter is the optical splitter PON LT tunable line terminal, UNI LT is the user side network interface line terminal. like Figure 4 As shown, the active OLT is connected to the active ONU through the active ODN. The main OLT includes multiple ports, each port corresponds to a wavelength channel, and each wavelength channel uses a downstream wavelength and an upstream wavelength. One OLT port on each wavelength channel manages a group of ONUs. The group of ONUs uses time division multiplexing to send uplink data, and the ONUs on different wavelength channels use wavelength division multiplexing to send data. The structure of the standby OLT is the same as that of the active OLT. The stan...

Embodiment 2

[0046] In the first embodiment, the standby ONU may not be in a working state, but in a ready state (a state in which it is in a backup state, ready to take over from the active ONU at any time, and in a state of sending data). The following are specific implementation steps.

[0047] exist Figure 4 Under the architecture shown, the OLT and ONU take the following main steps to establish communication and complete protection switching:

[0048] Step 1: The active OLT is in a working state and sends downlink frames.

[0049] Step 2: The active ONU listens to the registration message sent by the active OLT on the active channel to complete the registration, and the standby ONU is in a ready state.

[0050] Step 3: The main OLT sends the channel identification information of the protection channel of the main ONU to the main ONU;

[0051] Step 4: When the main ONU cannot achieve downlink frame synchronization, that is, when the downlink frame of the main ONU is out of synchroni...

Embodiment 3

[0054] exist Figure 4 (about Figure 4 For a description, see Embodiment 1. Under the architecture shown in Embodiment 1, the OLT and the ONU use the following main steps to establish communication and complete protection switching.

[0055] Step 1: Both the active OLT and the standby OLT are in a working state and send downlink frames.

[0056] Step 2: Both the active ONU and the standby ONU turn on the optical receivers, the active ONU listens to the registration message sent by the active OLT on the active wavelength channel and completes the registration, and the standby ONU listens to the standby OLT on the standby wavelength channel. The registration message completes the registration. Both the active ONU and the standby ONU are in a working state and perform service data transmission.

[0057] Step 3: The active ONU sends a PLOAM (Physical layer OAM, physical layer operation management and maintenance message) message (or an OMCI message) to the active OLT, notifyin...

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Abstract

The invention discloses a protection switching method in a passive optical network, an optical line terminal, and an optical network device. The method includes: a first optical network unit ONU performs data transmission on a first wavelength channel, and a second ONU performs data transmission on a second wavelength Data transmission is performed on the channel or is in a ready state; when the first ONU cannot realize downlink frame synchronization, the service data of the first ONU is switched to the second ONU for transmission to complete protection switching. The technical scheme of the present invention also participates in the work of the standby equipment when the PON system is not faulty, which helps to improve the line rate of the system, increase the bandwidth and reduce the cost. After a fault occurs, a protection switching mechanism can be implemented, which improves the utilization efficiency of system equipment.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a protection switching method in a passive optical network, an optical line terminal, and an optical network device. Background technique [0002] With the development of network technology, more and more need to use the network to transmit a large number of voice, data, video and other services, especially the emerging new services such as virtual video, the requirements for bandwidth continue to increase, 40G rate passive Optical network (Passive Optical Network, PON) is generated under this demand. [0003] The topology of the PON system is as follows figure 1 As shown, a PON system usually consists of an Optical Line Terminal (OLT, Optical Line Terminal) on the central office side, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN, Optical Distribution Network). point network structure. ODN is composed of single-mode fib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/032H04J14/02
CPCH04B10/032H04J14/0239
Inventor 耿丹马壮张伟良袁立权李明生
Owner ZTE CORP
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