CN113395106B

CN113395106B - Link protection method and system

Info

Publication number: CN113395106B
Application number: CN202010174127.0A
Authority: CN
Inventors: 杜喆; 张德智; 张东; 甘雨莹
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2022-06-03
Anticipated expiration: 2040-03-13
Also published as: CN113395106A

Abstract

The present disclosure provides a link protection method and system. The ONU uses the local main channel to perform service interaction with the main channel under the main PON port of the OLT, and uses the local standby channel to perform on-off detection on the main distribution optical fiber link; when the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the service from the local main channel to the local standby channel and sends distribution link interruption alarm information to the OLT; and the OLT switches the service of the ONU to a standby channel below the OLT main PON port according to the wiring link interruption alarm information. According to the method and the device, the ONU and the OLT are provided with the double channels, so that the ONU and the OLT perform corresponding channel switching under the condition of link interruption, and the safety of services is ensured.

Description

Link protection method and system

Technical Field

The present disclosure relates to the field of communications, and in particular, to a link protection method and system.

Background

In industrial information application scenarios such as an industrial PON (Passive Optical Network), a safe city, and The like, a PON technology-based FTTx (Fiber To The X) technology has been generally adopted To implement service bearer. However, the above industrial application scenarios put higher requirements on line protection of a PON ODN (Optical Distribution Network), and the current ODN link protection cannot provide security protection for services such as an industrial PON and video monitoring in a safe city.

Disclosure of Invention

Accordingly, the present disclosure provides a link protection scheme, in which a dual-mode optical module is disposed at a PON port, and a dual channel is used to implement safer link protection.

According to a first aspect of the embodiments of the present disclosure, there is provided a link protection method, including: an optical network unit ONU performs service interaction by using a local main channel and a main channel below a main PON port of an optical line terminal OLT, and performs on-off detection on a main distribution optical fiber link by using a local standby channel; when the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the service from the local main channel to the local standby channel and sends distribution link interruption alarm information to the OLT; and the OLT switches the service of the ONU to a standby channel below the OLT main PON port according to the wiring link interruption alarm information.

In some embodiments, the above method further comprises: after the OLT switches the service of the ONU to the standby channel under the OLT main PON port, detecting whether the service volume in the standby channel under the OLT main PON port exceeds a preset flow threshold or not; and if the traffic volume in the standby channel under the OLT main PON port exceeds a preset traffic threshold, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, and switches all ONU services under the OLT main PON port into the main channel under the OLT standby PON port.

In some embodiments, the above method further comprises: the OLT counts the received wiring link interruption warning information; if the received wiring link interruption alarm information exceeds the preset quantity threshold, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, and all ONU services under the OLT main PON port are switched into a main channel under the OLT standby PON port.

In some embodiments, the above method further comprises: the OLT utilizes a standby channel below the OLT main PON port to perform on-off detection on a main optical fiber link; if the interruption of the main optical fiber link is found, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, all ONU services under the OLT main PON port are switched into a main channel under the OLT standby PON port, and the standby channel under the OLT standby PON port is used for continuously carrying out on-off detection on the main optical fiber link so as to detect whether the main optical fiber link is recovered from the fault.

In some embodiments, in the active PON port and the standby PON port of the OLT, the active channel is a high-rate channel, and the standby channel is a low-rate channel; in the ONU, a main channel is a high-speed channel, and a standby channel is a low-speed channel.

In some embodiments, in the active PON port and the standby PON port of the OLT, the active channel is an XG-PON or XGs-PON channel, and the standby channel is a GPON channel; in the ONU, the main channel is an XG-PON or XGS-PON channel, and the standby channel is a GPON channel.

According to a second aspect of the embodiments of the present disclosure, there is provided a link protection system, including an optical network unit ONU, an optical line terminal OLT, and an optical splitter, wherein: the optical network unit comprises an optical splitter, an ONU and an optical line terminal OLT, wherein the ONU is configured to perform service interaction by using a local main channel and a main channel under a main PON port of the OLT and perform on-off detection on a main wiring optical fiber link by using a local standby channel; and the OLT is configured to switch the service of the ONU to a standby channel under the PON port used by the OLT according to the wiring link interruption alarm information.

In some embodiments, the OLT is further configured to detect whether traffic volume in the standby channel under the OLT active PON port exceeds a preset traffic threshold after switching the traffic of the ONU into the standby channel under the OLT active PON port, and if the traffic volume in the standby channel under the OLT active PON port exceeds the preset traffic threshold, the OLT starts switching from the OLT active PON port to the OLT standby PON port, and switches all the ONU traffic under the OLT active PON port into the active channel under the OLT standby PON port.

In some embodiments, the OLT is further configured to count the received wiring link interruption warning information, and if the received wiring link interruption warning information exceeds a predetermined number threshold, the OLT starts switching from the OLT active PON port to the OLT standby PON port, and switches all ONU traffic under the OLT active PON port to an active channel under the OLT standby PON port.

In some embodiments, the OLT is further configured to perform on-off detection on the trunk optical fiber link by using a standby channel under the OLT active PON port, and if the trunk optical fiber link is found to be interrupted, the OLT starts switching from the OLT active PON port to the OLT standby PON port, switches all ONU services under the OLT active PON port to the active channel under the OLT standby PON port, and continues performing on-off detection on the trunk optical fiber link by using the standby channel under the OLT standby PON port to detect whether the failure of the trunk optical fiber link is recovered.

In some embodiments, the active PON port and the standby PON port of the OLT are located in the same OLT device or in different OLT devices.

According to a third aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, where the computer-readable storage medium stores computer instructions, and the instructions, when executed by a processor, implement the method according to any one of the embodiments described above.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a flow diagram of a link protection method according to one embodiment of the present disclosure;

fig. 2 is a flow diagram of a link protection method according to another embodiment of the present disclosure;

FIG. 3 is a flow diagram of a link protection method according to yet another embodiment of the present disclosure;

FIG. 4 is a flow diagram of a link protection method according to yet another embodiment of the present disclosure;

FIG. 5 is a block diagram of a link protection system according to one embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a link protection system according to another embodiment of the present disclosure.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials and values set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.

The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Fig. 1 is a flow diagram of a link protection method according to one embodiment of the present disclosure.

In step 101, an ONU (Optical Network Unit) performs service interaction with a primary channel under a primary PON port of an OLT (Optical Line Terminal) by using a primary channel at a home end, and performs on-off detection on a primary distribution Optical fiber link by using a backup channel at the home end.

In some embodiments, the dual-mode optical module is disposed in the ONU, and one of the dual-mode optical module may be used as a main channel and the other may be used as a standby channel. The main channel is a high-rate channel, and the standby channel is a low-rate channel. For example, the main channel is a 10G XG-PON or XGS-PON channel, and the standby channel is a 1G GPON channel.

In some embodiments, two PON ports are provided on the OLT side, and one of the two PON ports may be used as an active PON port and the other as a standby PON port. The standby PON port can adopt a cold standby mode or a hot standby mode. In the cold standby mode, the optical module transmitter of the main PON port is turned on, and the optical module transmitter of the standby PON port is turned off. In the hot standby mode, the optical module transmitters of the main PON port and the standby PON port are both started.

The main PON port and the standby PON port on the OLT side are both provided with dual-mode optical modules, one of which can be used as a main channel and the other as a standby channel. The main channel is a high-rate channel, and the standby channel is a low-rate channel. For example, the primary channel is an XG-PON or XGS-PON channel, and the standby channel is a GPON channel.

In step 102, when the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the service from the local main channel to the local backup channel, and sends a distribution link interruption alarm message to the OLT.

For example, in the event of an interruption of the primary wiring link, the ONU switches from the xg(s) -PON channel to the GPON channel.

In step 103, the OLT switches the service of the ONU to the standby channel under the OLT-active PON port according to the wiring link interruption alarm information.

For example, the OLT switches the traffic of the ONU from the xg(s) -PON channel to the GPON channel based on the wiring link interruption alarm information.

In the link protection method provided in the above embodiment of the present disclosure, when the main distribution link is interrupted, both the ONU and the OLT perform corresponding channel switching, thereby ensuring that normal processing of a service can be guaranteed even when the link fails.

Fig. 2 is a flow diagram of a link protection method according to one embodiment of the present disclosure.

In step 201, the ONU performs service interaction with a main channel under a main PON port of the OLT through a local main channel, and performs on-off detection on a main distribution optical fiber link through a local standby channel.

In step 202, when the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the service from the local main channel to the local backup channel, and sends a distribution link interruption alarm message to the OLT.

For example, in the case of a disruption of the primary wiring link, the ONU switches from the xg(s) -PON channel to the GPON channel.

In step 203, the OLT switches the service of the ONU to the standby channel under the OLT-active PON port according to the wiring link interruption alarm information.

In step 204, the OLT detects whether traffic in a standby channel under the OLT active PON port exceeds a preset traffic threshold.

For example, the preset flow threshold is 1G.

In step 205, if the traffic in the standby channel under the OLT active PON port exceeds the preset traffic threshold, the OLT starts the switch from the OLT active PON port to the OLT standby PON port, and switches all the ONU traffic under the OLT active PON port to the active channel under the OLT standby PON port.

For example, in the main PON port on the OLT side, traffic detection is started after ONU traffic is switched from the main channel to the backup channel. If the traffic is found to be too large, that is, the standby channel cannot meet the service requirement, in this case, the OLT side starts the switching from the main PON port to the standby PON port, so as to switch all the ONU services under the main PON port to the main channel under the standby PON port.

Fig. 3 is a flow diagram of a link protection method according to yet another embodiment of the present disclosure.

In step 301, the OLT performs statistics on the received wiring link interruption alarm information.

And the ONU sends corresponding distribution link interruption alarm information to the OLT when the main distribution optical fiber link is interrupted.

In step 302, if the received wiring link interruption alarm information exceeds the predetermined number threshold, the OLT starts switching from the OLT active PON port to the OLT standby PON port, and switches all ONU services under the OLT active PON port to the active channel under the OLT standby PON port.

For example, in a second-stage optical splitting scenario, a certain branch optical fiber is interrupted, which causes service interruption of all ONUs in the second-stage optical splitter, and in this case, the OLT may receive a large amount of alarm information. In this case, all ONU services under the current OLT active PON port are switched to the active channel under the OLT standby PON port, thereby ensuring normal operation of the services.

Fig. 4 is a flow diagram of a link protection method according to yet another embodiment of the present disclosure.

In step 401, the OLT performs on-off detection on the trunk optical fiber link by using a standby channel under the OLT main PON port.

For example, the OLT side performs on-off detection of the main Optical fiber link by using an OTDR (Optical Time Domain Reflectometer) through the downlink wavelength of the backup channel.

In step 402, if the interruption of the main optical fiber link is found, the OLT starts switching from the OLT active PON port to the OLT standby PON port, switches all ONU services under the OLT active PON port to an active channel under the OLT standby PON port, and continues performing on-off detection on the main optical fiber link by using a standby channel under the OLT standby PON port to detect whether the failure of the main optical fiber link is recovered. Therefore, the OLT side can continuously monitor the trunk optical fiber link.

Fig. 5 is a schematic structural diagram of a link protection system according to one embodiment of the present disclosure. As shown in fig. 5, the link protection system includes ONUs 511-51m, an optical splitter 52, and an OLT 53.

As shown in fig. 5, each ONU is provided with an active channel and a standby channel. The main channel is a high-rate channel, and the standby channel is a low-rate channel. For example, the primary channel is an XG-PON or XGS-PON channel, and the standby channel is a GPON channel.

In the OLT 53, two

PON ports

531 and 532 are provided. One of the PON ports may be an active PON port, and the other PON port may be a standby PON port. And a main channel and a standby channel are arranged below each PON port. The main channel is a high-rate channel, and the standby channel is a low-rate channel. For example, the primary channel is an XG-PON or XGS-PON channel, and the standby channel is a GPON channel.

The beam splitter 52 is a 2: N splitter. Therefore, each channel of each ONU can be connected with the main PON port or the standby PON port of the OLT.

As shown in fig. 5, each ONU 511-51m is configured to perform service interaction with an active channel under an active PON port 531 of an OLT 53 through an optical splitter 52, and perform on-off detection on an active distribution optical fiber link through a local standby channel. When the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the traffic from the local main channel to the local backup channel, and sends distribution link interruption alarm information to the OLT 53.

The OLT 53 is configured to switch the traffic of the ONU into the standby channel under the OLT-active PON port 531 according to the wiring link interruption alarm information.

In some embodiments, the OLT 53 is further configured to detect whether traffic volume in the standby channel under the OLT active PON port 531 exceeds a preset traffic threshold after switching the traffic of the ONU into the standby channel under the active PON port. If the traffic volume in the standby channel under the OLT main PON port exceeds the preset traffic threshold, the oltt starts the switch from the OLT main PON port 531 to the OLT standby PON port 532, and switches all the ONU traffic under the OLT main PON port 531 to the main channel under the OLT standby PON port 532.

In some embodiments, OLT 53 is further configured to perform statistics on received wiring link outage alarm information. If the received wiring link interruption alarm information exceeds the predetermined number threshold, the OLT 53 starts the switching from the OLT main PON port 531 to the OLT standby PON port 532, and switches all ONU services under the OLT main PON port 531 to the main channel under the OLT standby PON port 531.

In some embodiments, the OLT 53 is further configured to perform on-off detection on the trunk optical fiber link by using a standby channel under the OLT main PON port 531, and if the trunk optical fiber link is found to be interrupted, the OLT 53 starts switching from the OLT main PON port 531 to the OLT standby PON port 532, switches all ONU services under the OLT main PON port 531 into a main channel under the OLT standby PON port 532, and continues performing on-off detection on the trunk optical fiber link by using a standby channel under the OLT standby PON port 532 to detect whether the trunk optical fiber link failure is recovered.

Fig. 6 is a schematic structural diagram of a link protection system according to another embodiment of the present disclosure. Fig. 6 is different from fig. 5 in that, in the embodiment shown in fig. 5, the active PON port 531 and the standby PON port 532 on the OLT side are located in the same OLT apparatus. In the embodiment shown in fig. 6, the active PON port and the standby PON port are located in different OLT devices. For example, the OLT device 61 is provided with an active PON port 611, and the OLT device 62 is provided with a standby PON port 612.

The present disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, and when executed by the processor, the instructions implement the method according to any one of fig. 1-4.

In some embodiments, the functional modules may be implemented as a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable Logic device, discrete Gate or transistor Logic, discrete hardware components, or any suitable combination thereof, for performing the functions described in this disclosure.

By implementing the present disclosure, the following advantageous effects can be obtained:

1) the public access is provided with double PON ports for the OLT, each PON port is provided with GPON/XG (S) -PON double channels, and the ONU provides the GPON/XG (S) -PON double channels to form a trunk and wiring link protection framework. The wiring link and the trunk link can be simultaneously protected from interruption, and the wiring interruption is provided with a dual protection mechanism.

2) The method and the device can realize real-time diagnosis of on-off of the trunk/distribution optical fiber. The method is different from single-side detection in the prior art, and the on-off detection technology is more stable, reliable, rapid and effective.

So far, embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A link protection method, comprising:

an optical network unit ONU performs service interaction by using a local main channel and a main channel below a main PON port of an optical line terminal OLT, and performs on-off detection on a main distribution optical fiber link by using a local standby channel;

when the ONU detects that the main distribution optical fiber link is interrupted, the ONU switches the service from the local main channel to the local standby channel and sends distribution link interruption alarm information to the OLT;

the OLT switches the service of the ONU to a standby channel under the OLT main PON port according to the wiring link interruption alarm information;

the OLT utilizes a standby channel below the OLT main PON port to perform on-off detection on a main optical fiber link;

if the interruption of the main optical fiber link is found, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, all ONU services under the OLT main PON port are switched into a main channel under the OLT standby PON port, and the standby channel under the OLT standby PON port is used for continuously carrying out on-off detection on the main optical fiber link so as to detect whether the main optical fiber link is recovered from the fault.

2. The method of claim 1, further comprising:

after the OLT switches the service of the ONU to the standby channel under the OLT main PON port, detecting whether the service volume in the standby channel under the OLT main PON port exceeds a preset flow threshold or not;

and if the traffic volume in the standby channel under the OLT main PON port exceeds a preset traffic threshold, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, and switches all ONU services under the OLT main PON port into the main channel under the OLT standby PON port.

3. The method of claim 2, further comprising:

the OLT counts the received wiring link interruption warning information;

if the received wiring link interruption alarm information exceeds the preset quantity threshold, the OLT starts the switching from the OLT main PON port to the OLT standby PON port, and all ONU services under the OLT main PON port are switched into a main channel under the OLT standby PON port.

4. The method of any one of claims 1-3,

in a main PON port and a standby PON port of the OLT, a main channel is a high-rate channel, and a standby channel is a low-rate channel;

in the ONU, a main channel is a high-rate channel, and a standby channel is a low-rate channel.

5. The method of claim 4, wherein,

in a main PON port and a standby PON port of the OLT, a main channel is an XG-PON or XGS-PON channel, and a standby channel is a GPON channel;

in the ONU, the main channel is an XG-PON or XGS-PON channel, and the standby channel is a GPON channel.

6. A link protection system comprises an optical network unit ONU, an optical line terminal OLT and an optical splitter, wherein:

the ONU is configured to perform service interaction by using a local main channel and a main channel under a main PON port of an OLT through an optical splitter, perform on-off detection on a main distribution optical fiber link by using a local standby channel, switch the service from the local main channel to the local standby channel and send distribution link interruption warning information to the OLT when the ONU detects that the main distribution optical fiber link is interrupted;

the OLT is configured to switch the service of the ONU into a standby channel below a PON port used by the OLT according to the wiring link interruption alarm information; the optical network unit is further configured to perform on-off detection on the main optical fiber link by using a standby channel under the OLT main PON port, and if the main optical fiber link is found to be interrupted, the OLT starts switching from the OLT main PON port to the OLT standby PON port, switches all ONU services under the OLT main PON port to the main channel under the OLT standby PON port, and continues to perform on-off detection on the main optical fiber link by using the standby channel under the OLT standby PON port to detect whether the main optical fiber link is recovered from the fault.

7. The system of claim 6, wherein,

the OLT is further configured to detect whether traffic in a standby channel under the OLT main PON port exceeds a preset traffic threshold after switching the service of the ONU into the standby channel under the OLT main PON port, and if the traffic in the standby channel under the OLT main PON port exceeds the preset traffic threshold, the OLT starts switching from the OLT main PON port to the OLT standby PON port and switches all ONU services under the OLT main PON port into the main channel under the OLT standby PON port.

8. The system of claim 7, wherein,

the OLT is further configured to count the received wiring link interruption warning information, and if the received wiring link interruption warning information exceeds a predetermined number threshold, the OLT starts switching from the OLT main PON port to the OLT standby PON port, and switches all ONU services under the OLT main PON port to a main channel under the OLT standby PON port.

9. The system of any one of claims 6-8,

in the ONU, a main channel is a high-speed channel, and a standby channel is a low-speed channel.

10. The system of claim 9, wherein,

in a main PON port and a standby PON port of the OLT, a main channel is an XG-PON channel or an XGS-PON channel, and a standby channel is a GPON channel;

11. The system of claim 7, wherein,

the active PON port and the standby PON port of the OLT are positioned in the same OLT equipment or in different OLT equipment.

12. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-5.