CN114697773B

CN114697773B - Communication network architecture

Info

Publication number: CN114697773B
Application number: CN202210361526.7A
Authority: CN
Inventors: 江永杰; 王浩宇; 廖申鹏; 赵桂标; 骆益民; 黄志新; 刘年; 袁展雄; 赖柏辉
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2024-04-02
Anticipated expiration: 2042-04-07
Also published as: CN114697773A

Abstract

The application provides a communication network architecture. The communication network architecture comprises: the system comprises first OLT equipment and an OTN network; the first OLT equipment comprises a first optical module and a second optical module, and the second optical module is a double-fiber bidirectional optical module; the first optical module of the first OLT equipment is connected with the uplink equipment to form a first uplink routing link of the first OLT equipment, and the second optical module of the first OLT equipment is connected with the uplink equipment through the OTN network to form a second uplink routing link of the first OLT equipment. According to the communication network architecture, the first OLT equipment can realize an uplink routing link through the OTN, so that when the uplink routing link is realized, fiber core resources of a machine room are not required to be occupied, and therefore, the dual-route protection can be realized, and meanwhile, a part of fiber core resources are saved.

Description

Communication network architecture

Technical Field

The present application relates to communication technology, and in particular, to a communication network architecture.

Background

With the iteration of network development, the existing network is gradually developed from hundred megabytes to gigabytes, the broadband access demand is also continuously increased, and the technology of the 10Gigabit passive optical network (10 Gigabit-Capable Passive Optical Networks,10G PON) is the latest generation broadband passive optical integrated access standard. It is based on an extension of the GPON network, providing an available bandwidth of 10 Gbit/s. The GPON network formed by the GPON technology comprises an optical line terminal (optical line terminal, OLT) device arranged in a machine room, and is used for completing service access of an access network.

At present, the OLT equipment of the machine room adopts a whole-course bare fiber mode to realize physical single-route uplink broadband access server (Broadband Remote Access Server, BRAS) equipment. That is, one OLT device completes physical single-route uplink with one BRAS device by adopting two optical fibers (i.e., two fiber cores) in the optical fiber cable, wherein one optical fiber is used for the OLT device to send data to the BRAS device, and the other optical fiber is used for the OLT device to receive data from the BRAS device.

At present, due to the problem of insufficient fiber core resources of a machine room, physical dual-route protection cannot be realized for the OLT equipment in the machine room.

Disclosure of Invention

The application provides a communication network architecture for solve the problem that the OLT equipment in the computer lab can't realize physical double route protection because of the problem that computer lab fiber core resource is not enough.

In a first aspect, the present application provides a communication network architecture comprising: the system comprises first OLT equipment and an OTN network;

the first OLT equipment comprises a first optical module and a second optical module, and the second optical module is a double-fiber bidirectional optical module;

the first optical module of the first OLT equipment is connected with the uplink equipment to form a first uplink routing link of the first OLT equipment, and the second optical module of the first OLT equipment is connected with the uplink equipment through the OTN network to form a second uplink routing link of the first OLT equipment.

Optionally, the first optical module is a single-fiber bidirectional optical module;

and the first optical module of the first OLT equipment is connected with the uplink equipment through an optical fiber.

Optionally, the uplink device of the first OLT device includes: the first BRAS device and the second BRAS device; wherein the first BRAS device includes: a third optical module, the second BRAS device comprising: the third optical module is a single-fiber bidirectional optical module, and the fourth optical module is a double-fiber bidirectional optical module;

the first optical module of the first OLT equipment is connected with the third optical module of the first BRAS equipment through an optical fiber to form a first uplink routing link of the first OLT equipment; and the second optical module of the first OLT equipment is connected with the fourth optical module of the second BRAS equipment through the OTN network to form a second uplink routing link of the first OLT equipment.

Optionally, the communication network architecture further includes: the second OLT equipment and the first OLT equipment are positioned in the same machine room;

the second OLT device includes a fifth optical module and a sixth optical module, and the first BRAS device further includes: a seventh optical module, the second BRAS device comprising: an eighth light module;

The fifth optical module of the second OLT equipment is connected with the seventh optical module of the first BRAS equipment to form a first uplink routing link of the second OLT equipment; and the sixth optical module of the second OLT equipment is connected with the eighth optical module of the second BRAS equipment to form a second uplink routing link of the second OLT equipment.

Optionally, the fifth optical module and the seventh optical module are both single-fiber bidirectional optical modules, and the sixth optical module and the eighth optical module are both double-fiber bidirectional optical modules;

the fifth optical module of the second OLT equipment is connected with the seventh optical module of the first BRAS equipment through an optical fiber to form a first uplink routing link of the second OLT equipment; and the sixth optical module of the second OLT equipment is connected with the eighth optical module of the second BRAS equipment through the OTN network to form a second uplink routing link of the second OLT equipment.

Optionally, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all double-fiber bidirectional optical modules;

the fifth optical module of the second OLT equipment is connected with the seventh optical module of the first BRAS equipment through two optical fibers to form a first uplink routing link of the second OLT equipment;

The sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through two optical fibers, so as to form a second uplink routing link of the second OLT device; or the sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device through the OTN network, so as to form a second uplink routing link of the second OLT device.

Optionally, the traffic handled by the first OLT device is different from the traffic handled by the second OLT device.

Optionally, the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through a first OTN routing link and a second OTN routing link in the OTN network, respectively;

and the sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through a third OTN routing link and a fourth OTN routing link in the OTN network respectively.

Optionally, a dual-route connection is adopted between OTN devices of a convergence layer in each OTN routing link and/or a dual-route connection is adopted between OTN devices of a core layer in each OTN routing link.

Optionally, the uplink device of the first OLT device is a third BRAS device; wherein the third BRAS device includes: the optical system comprises a ninth optical module and a tenth optical module, wherein the ninth optical module is a single-fiber bidirectional optical module, and the tenth optical module is a double-fiber bidirectional optical module;

The first optical module of the first OLT equipment is connected with the ninth optical module of the third BRAS equipment through a third optical fiber to form a first uplink routing link of the first OLT equipment; and the second optical module of the first OLT equipment is connected with the tenth optical module of the third BRAS equipment through the OTN network to form a second uplink routing link of the first OLT equipment.

According to the communication network architecture provided by the application, the first OLT equipment can realize an uplink routing link through the OTN network, so that when the uplink routing link is realized, fiber core resources of a machine room are not required to be occupied, and therefore, when the dual-route protection is realized, a part of fiber core resources are saved.

Drawings

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

Fig. 1 is a schematic diagram of a physical single-route connection between an OLT device and a BRAS device in the prior art;

fig. 2 is a schematic diagram of a physical dual-route connection between OLT equipment and BRAS equipment in the prior art;

fig. 3 is a schematic structural diagram of a communication network architecture provided in the present application;

FIG. 4 is a schematic diagram of the working principle of a single-fiber bi-directional optical module;

fig. 5 is a schematic diagram of a service data flow between an OLT device and a BRAS device;

FIG. 6 is a schematic diagram of a traffic flow for subnet connection protection;

FIG. 7 is a schematic diagram of the optical signal flow direction of the optical multiplexing section protection;

fig. 8 is a signal flow diagram of linear multiplexing segment protection.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

The GPON network formed by adopting the GPON technology comprises: an optical network unit (Optical Network Unit, ONU), an optical distribution network (Optical Distribution Network, ODN), an OLT. The OLT device is connected to at least one ODN in a downlink manner, and each ODN is connected to at least one ONU located on the user side. The OLT equipment is connected with the BRAS equipment. I.e. the BRAS device is an upstream device of the OLT device.

GPON networks formed by GPON technology carry traffic below gigabit. When the user equipment uses a certain service through the GPON network, for example, taking a request for providing service data such as voice, data, video, etc. as an example, the user equipment may send a data service request to the OLT equipment through the ONU, and after receiving the service request from the ONU, the OLT equipment transmits the service request to the BRAS equipment. The BRAS device sends the service request to the service answering party through the Internet, and receives the answering data of the answering party through the Internet. The BRAS device may then send the reply data to the OLT device to cause the OLT device to send the reply data to the user device along the original path.

In the prior art, a whole-course bare fiber mode is adopted between the OLT equipment and the BRAS equipment to realize physical single-route connection. The bare fiber is the optical fiber jump fiber which is made by only passing through the distribution frame or the distribution box without passing through any exchanger or router between the two communication parties.

Fig. 1 is a schematic diagram of a physical single-route connection between an OLT device and a BRAS device in the prior art. As shown in fig. 1, the OLT device and the BRAS device are both provided with dual-fiber bidirectional optical modules, and each dual-fiber bidirectional optical module includes: a transmit port and a receive port.

The sending port of the double-fiber bidirectional optical module of the OLT equipment is connected with the receiving port of the double-fiber bidirectional optical module of the BRAS equipment through one fiber core of the bare fiber, and is used for the OLT equipment to send data to the BRAS equipment, so that a single-route uplink between the OLT equipment and the BRAS equipment is formed.

The receiving port of the double-fiber bidirectional optical module of the OLT equipment is connected with the transmitting port of the double-fiber bidirectional optical module of the BRAS equipment through one fiber core of the bare fiber, and is used for the OLT equipment to receive data from the BRAS equipment, so as to form a downlink of a single route between the OLT equipment and the BRAS equipment.

Namely, the OLT equipment adopts two fiber cores of a bare fiber to connect with the BRAS equipment in a single route. It should be understood that a core of bare fiber may also be referred to as an optical fiber, and that the two concepts are equivalent in this application and are not differentiated.

In the single-route connection mode, once the optical fiber between the OLT equipment and the BRAS equipment fails, the OLT equipment and the BRAS equipment cannot normally communicate, and the service is affected. Thus, solutions for OLT apparatus dual-route protection are proposed in the prior art.

Fig. 2 is a schematic diagram of a physical dual-route connection between OLT equipment and BRAS equipment in the prior art. As shown in fig. 2, in this solution, the OLT device is provided with two bi-fiber bi-directional optical modules, and accordingly the BRAS device 1 is provided with a bi-fiber bi-directional optical module, and the BRAS device 2 is provided with a bi-fiber bi-directional optical module.

The OLT equipment adopts one of the double-fiber bidirectional optical modules, and is connected with the double-fiber bidirectional optical module of the BRAS equipment 1 through 2 optical fibers to form an uplink route of the OLT equipment. The OLT equipment adopts another double-fiber bidirectional optical module, and is connected with the double-fiber bidirectional optical module of the BRAS equipment 2 through 2 optical fibers to form another uplink route of the OLT equipment, thereby realizing the double-route uplink of the OLT equipment.

In this implementation, even if one upstream route of the OLT apparatus fails, the OLT apparatus may implement communication through another route to ensure reliability of the service.

However, when the scheme shown in fig. 2 is adopted to realize dual-route uplink of the OLT apparatus, more core resources of the machine room are occupied. When a plurality of OLT devices are deployed in a machine room, the situation that the dual-route protection of the OLT devices is difficult to realize due to insufficient fiber core resources of the machine room easily occurs.

An optical transport network (Optical Transport Network, OTN) network is a ring transport network composed of a plurality of OTN devices, which can implement transmission, multiplexing, routing, monitoring of service signals in an optical domain, and ensure performance indexes and survivability thereof. The OTN network is divided into a convergence layer and a core layer. The convergence layer will carry the different traffic from the OLT apparatus. The core layer carries all traffic from the convergence layer.

The inventor found through research that the OTN network includes OTN devices provided in each machine room. Therefore, through the OTN network, communication can be realized between the devices located in any two machine rooms by means of the OTN network. In view of this, the application proposes a communication architecture for implementing dual-route uplink of OLT devices by means of a well-constructed OTN network, so that the OLT devices can be connected with the uplink devices by means of the OTN network without using additional fiber core resources, thereby solving the problem that dual-route protection of the OLT devices cannot be implemented due to insufficient fiber core resources.

The following describes the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 3 is a schematic structural diagram of a communication network architecture provided in the present application. As shown in fig. 3, the communication network architecture includes: the system comprises a first OLT device and an OTN network.

The first OLT apparatus includes a first optical module and a second optical module. The second optical module is a double-fiber bidirectional optical module. The dual-fiber bidirectional optical module refers to an optical module having two ports, wherein one port is a receiving port, the other port is a transmitting port, and the optical module transmits an optical signal through one optical fiber and receives the optical signal through the other optical fiber, namely, the dual-fiber bidirectional optical module is characterized in that the optical module has two ports.

In this embodiment, the first optical module of the first OLT apparatus is connected to the uplink apparatus, and forms a first uplink routing link of the first OLT apparatus. The second optical module of the first OLT device is connected with the uplink device through the OTN network, and forms a second uplink routing link of the first OLT device.

The transmitting port and the receiving port of the second optical module of the first OLT device are respectively connected with an OTN device in the same machine room as the first OLT device in the OTN network through one fiber-jumping (i.e., the second optical module is connected with the first OLT device through two fiber-jumping), and the OTN device is connected with the uplink device through two fiber-jumping devices.

By adopting the communication architecture provided by the embodiment of the application, the first OLT equipment can realize an uplink routing link through the OTN network, so that when the uplink routing link is realized, the fiber core resource of a machine room is not required to be occupied, and therefore, the dual-route protection can be realized and a part of fiber core resource can be saved.

The implementation manner of the first uplink routing link of the first OLT device is not limited, and may include, for example, the following several implementation manners:

the implementation mode is as follows: the first optical module of the first OLT apparatus is a single-fiber bidirectional optical module. The single fiber bi-directional optical module includes a built-in wavelength division multiplexing (Wavelength Division Multiplexing, WDM) filter and a transceiver port. The optical module can distinguish wavelength signals in the transmitting and receiving directions by utilizing the WDM filter, so that the optical module can realize the receiving and the transmitting simultaneously through optical signals with different wavelengths on one optical fiber to realize full duplex operation. Fig. 4 is a schematic diagram of the working principle of the single-fiber bidirectional optical module. As shown in fig. 4, the uplink may employ an optical signal having a wavelength of 1310 nanometers (nm), and the downlink may employ an optical signal having a wavelength of 1550 nm. Through the single-fiber bidirectional optical module, the receiving and transmitting can be realized by adopting only one optical fiber, so that fiber core resources can be saved.

In this implementation manner, the first optical module of the first OLT device may be connected to the uplink device through an optical fiber to form a first uplink routing link of the first OLT device, and the second optical module of the first OLT device may be connected to the uplink device through an OTN network to form a second uplink routing link of the first OLT device.

Compared with the prior art, the implementation mode can save fiber core resources when the second uplink routing link is implemented, and only one fiber core is needed when the first uplink routing link of the first OLT equipment is implemented. That is, in this implementation manner, the physical dual-route uplink of the first OLT device is implemented, and only one core resource is needed, so that the core resource during the physical dual-route uplink of the OLT device can be saved.

The implementation mode II is as follows: the first optical module of the first OLT apparatus is a dual-fiber bidirectional optical module.

In one possible implementation manner, a first optical module of the first OLT device may be connected to the uplink device through two optical fibers to form a first uplink routing link of the first OLT device, and a second optical module of the first OLT device may be connected to the uplink device through an OTN network to form a second uplink routing link of the first OLT device.

Regarding how the first optical module of the first OLT apparatus implements the first uplink route through two optical fibers, description of the uplink route implemented by the optical module of the OLT apparatus through two optical fibers in the prior art may be referred to, and will not be repeated herein.

Compared with the prior art, by adopting the implementation mode, the first OLT equipment can save the fiber core resource of one uplink routing link through the OTN network. According to the implementation mode, under the condition that the existing OLT equipment is not changed to realize a physical single-route link, physical double-route protection can be realized by means of an OTN network only by adding the second optical module, and engineering construction efficiency is higher.

In another possible implementation manner, the first optical module of the first OLT device may be connected to the uplink device through an OTN network, to form a first uplink routing link of the first OLT device. The second optical module of the first OLT apparatus is also connected to the uplink apparatus through the OTN network, so as to form a second uplink routing link of the first OLT apparatus. That is, both upstream routes of the first OLT apparatus are implemented through the OTN network.

Regarding how the first optical module of the first OLT apparatus implements the first uplink route through the OTN network, description of the second uplink route implemented by the second optical module of the first OLT apparatus through the OTN network may be referred to, and will not be described herein.

Compared with the prior art, the physical dual-routing of the first OLT equipment can be realized by adopting the implementation mode without occupying a fiber core.

It should be understood that the uplink device in the foregoing embodiment may be, for example, a BRAS device, or other devices that are located in an uplink of the OLT device and are used for communication with the OLT device, which is not limited in this application. For convenience of description, the following embodiments are described by taking BRAS device as an example.

Taking BRAS equipment as an example, how to implement dual-route uplink between the first OLT equipment and the BRAS equipment is described below:

first case: the first OLT equipment realizes the double-route protection of the first OLT equipment by connecting two BRAS equipment. That is, the upstream device of the first OLT device includes a first BRAS device and a second BRAS device. The first BRAS device includes: the third optical module, the second BRAS device includes: and the fourth optical module is a double-fiber bidirectional optical module.

In this case, the first OLT device dual-route uplink BRAS device may have the following implementations:

implementation 1: the first OLT equipment is connected with the first BRAS equipment through an optical fiber, and is connected with the second BRAS equipment through an OTN network, so that double-route protection is realized.

For example, the first optical module of the first OLT device and the third optical module of the first BRAS device are both single-fiber bidirectional optical modules. The first optical module of the first OLT device may be connected to the third optical module of the first BRAS device by an optical fiber, so as to form a first uplink routing link of the first OLT device. That is, the first uplink routing link may be implemented using one optical fiber.

Regarding how the first optical module of the first OLT device is connected to the third optical module of the first BRAS device through an optical fiber, the description of the first uplink route by the first optical module of the first OLT device through an optical fiber in the communication architecture provided in the embodiment of the present application may be omitted herein.

The second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through the OTN network, so as to form a second uplink routing link of the first OLT device. That is, the second uplink routing link can be implemented using the OTN network.

Regarding how the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through the OTN network, description of the second uplink route through the OTN network by referring to the second optical module of the first OLT device may be omitted herein.

In this implementation, fig. 5 is a schematic diagram of a traffic data flow between the OLT device and the BRAS device. As shown in fig. 5, taking the service data flow between the first OLT device and the first BRAS device and the second BRAS device as an example, the first OLT device receives a data service request sent by the user device to the first OLT device through the ONU, and sends the data service request to the first BRAS device and the second BRAS device respectively. The first OLT equipment sends the data service request to the first BRAS equipment through an optical fiber, so that the service transmission of a first uplink routing link of the first OLT equipment is realized; in addition, the first OLT device sends the data service request to the second BRAS device through the OTN network, so as to implement service transmission of the second uplink routing link of the first OLT device. The first BRAS device and the second BRAS device send the service request to the service responder through the Internet, and receive response data of the responder through the Internet. And then, the first BRAS device and the second BRAS device send the response data to the first OLT device, so that the first OLT device sends the response data to the user device along the original path.

Therefore, by adopting the implementation manner provided by the embodiment, namely by adopting the single-fiber bidirectional optical module and utilizing the OTN network, fiber core resources can be saved. On the basis of saving fiber core resources, the first OLT equipment realizes double-route protection by connecting two BRAS equipment, so that if one BRAS equipment fails, the other BRAS equipment can be used for service transmission, and the reliability of the service is ensured.

In this implementation manner, if the machine room further deploys the second OLT apparatus, that is, the second OLT apparatus and the first OLT apparatus are located in the same machine room. The second OLT device may be connected to the first BRAS device and the second BRAS device in several ways:

the second OLT device includes a fifth optical module and a sixth optical module, and the first BRAS device includes: a seventh optical module, the second BRAS device comprising: and an eighth light module.

Mode 1: the second OLT equipment is connected with the first BRAS equipment through an optical fiber, and is connected with the second BRAS equipment through an OTN network, so that double-route protection is realized. Namely, the fifth optical module and the seventh optical module are single-fiber bidirectional optical modules, and the sixth optical module and the eighth optical module are double-fiber bidirectional optical modules.

The fifth optical module of the second OLT device is connected with the seventh optical module of the first BRAS device through an optical fiber, so as to form a first uplink routing link of the second OLT device. That is, the first uplink routing link may be implemented using one optical fiber.

Regarding how the fifth optical module of the second OLT device is connected to the seventh optical module of the first BRAS device through an optical fiber, the description of the first uplink route implemented by the first optical module of the first OLT device through an optical fiber in the communication architecture provided in the embodiment of the present application may be omitted herein.

The sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through an OTN network, so as to form a second uplink routing link of the second OLT device. That is, the second uplink routing link can be implemented using the OTN network.

Regarding how the sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device through the OTN network, reference may be made to a description that the second optical module of the first OLT device is connected to the uplink device through the OTN network, and the implementation principle is similar, which is not repeated herein.

This implementation can be used in general for the following scenarios: when one OLT device is in the machine room and utilizes two fiber cores to realize single-route uplink BRAS device, under the condition of adding another OLT device, how to utilize the two fiber cores to realize double-route uplink of the two OLT devices.

Taking the example that the first OLT apparatus uses two cores to uplink with the first BRAS apparatus in a single route. In this embodiment, a first optical module is set for the first OLT apparatus, and one optical fiber in the physical single-route link of the original first OLT apparatus is connected to the third optical module of the first BRAS apparatus, and the second optical module of the first OLT apparatus is connected to the fourth optical module of the second BRAS apparatus by using the OTN network.

The fifth optical module of the second OLT device is connected to the seventh optical module of the first BRAS device by using another optical fiber in the physical single-route link of the original first OLT device, and the sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device by using the OTN network.

The existing fiber core resources of the machine room can be fully utilized through the implementation mode, a new optical cable is not required to be laid, and engineering construction efficiency is higher.

Mode 2: the second OLT equipment is connected with the first BRAS equipment through two optical fibers and is connected with the second BRAS equipment through an OTN network, so that double-route protection is realized. Namely, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all double-fiber bidirectional optical modules.

The fifth optical module of the second OLT device is connected with the seventh optical module of the first BRAS device through two optical fibers, so as to form a first uplink routing link of the second OLT device. I.e. two optical fibers are used to implement the first uplink routing link.

Regarding how the fifth optical module of the second OLT device is connected to the seventh optical module of the first BRAS device through two optical fibers, description of uplink routing through two optical fibers by referring to the optical module of the OLT device in the prior art may be omitted here.

The sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through an OTN network, so as to form a second uplink routing link of the second OLT device. I.e. the second upstream routing link is implemented with the OTN network.

The sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device through the OTN network, and description of connection between the second optical module of the first OLT device and the uplink device through the OTN network may be referred to, which is similar to the implementation principle and will not be described herein.

Compared with the prior art, by adopting the implementation mode, the second OLT equipment can save the fiber core resource of one uplink routing link through the OTN network. According to the implementation mode, under the condition that the existing second OLT equipment is not changed to realize a physical single-route link, the second OLT equipment can realize physical double-route protection by means of an OTN network only by adding a sixth optical module, and engineering construction efficiency is higher.

Mode 3: the second OLT equipment is connected with the first BRAS equipment through the OTN network, and is connected with the second BRAS equipment through the OTN network, so that the dual-route protection is realized. Namely, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all double-fiber bidirectional optical modules.

The fifth optical module of the second OLT device is connected with the seventh optical module of the first BRAS device through an OTN network, so as to form a first uplink routing link of the second OLT device. That is, the first upstream routing link is implemented using an OTN network.

Regarding how the fifth optical module and the sixth optical module of the second OLT device are connected to the seventh optical module of the first BRAS device and the eighth optical module of the second BRAS device through the OTN network, the manner in which the second optical module of the first OLT device is connected to the uplink device through the OTN network may be referred to, and the implementation principle is similar and will not be repeated.

Mode 4: the second OLT equipment is connected with the first BRAS equipment through two optical fibers, and is connected with the second BRAS equipment through the two optical fibers, so that double-route protection is realized. Namely, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all double-fiber bidirectional optical modules.

The sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through two optical fibers, so as to form a second uplink routing link of the second OLT device. I.e. two optical fibers are used to implement the second uplink routing link.

The description of how the fifth optical module and the sixth optical module of the second OLT device are connected to the seventh optical module of the first BRAS device and the eighth optical module of the second BRAS device through two optical fibers, respectively, may refer to the optical modules of the OLT device in the prior art to implement uplink routing through two optical fibers, which is not described herein again.

Mode 5: the second OLT equipment is connected with the first BRAS equipment through one optical fiber, and is connected with the second BRAS equipment through two optical fibers, so that double-route protection is realized. The fifth optical module and the eighth optical module are all single-fiber bidirectional optical modules, and the sixth optical module and the seventh optical module are all double-fiber bidirectional optical modules.

The fifth optical module of the second OLT device is connected with the seventh optical module of the first BRAS device through an optical fiber, so as to form a first uplink routing link of the second OLT device. I.e. one optical fiber is used for implementing the first uplink routing link.

The sixth optical module of the second OLT device is connected with the eighth optical module of the second BRAS device through two optical fibers, so as to form a second uplink routing link of the second OLT device. I.e. two optical fibers are used to implement the first uplink routing link.

The description of how the sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device through two optical fibers may refer to the description of implementing uplink routing by the optical modules of the OLT device through two optical fibers in the prior art, which is not described herein again. Compared with the prior art, by adopting the implementation mode, the fifth optical module of the second OLT equipment can realize the first uplink routing link of the second OLT equipment by adopting the single-fiber bidirectional optical module and only needing one fiber core resource, thereby saving the fiber core resource.

It should be noted that the above several ways are only exemplary, and several possible implementations of how the second OLT device located in the same machine room as the first OLT device may implement dual-route protection when the first OLT device is connected to the first BRAS device through an optical fiber and connected to the second BRAS device through an OTN network are given. It should be understood that, in the implementation manner of the above-mentioned routing dual protection of the second OLT device, the locations of the first BRAS device and the second BRAS device may be interchanged, that is, the second OLT device may implement route uplink with the first BRAS device in the manner described above for implementing route uplink with the second BRAS device. Accordingly, the second OLT device may be configured to implement route uplink with the second BRAS device by adopting the foregoing manner of implementing route uplink with the first BRAS device, which is not described herein.

It should be understood that the second OLT apparatus and the first OLT apparatus described above may be OLT apparatuses each for handling the same service, and each ONU to which the OLT apparatus is connected is different. Or, the service processed by the second OLT device is different from the service processed by the first OLT device. For example, the second OLT apparatus carries traffic under the tera, and the first OLT apparatus carries traffic under the giga.

Implementation 2: the first OLT equipment is connected with the first BRAS equipment through two optical fibers and is connected with the second BRAS equipment through the OTN network, so that double-route protection is realized.

For example, the first optical module of the first OLT device and the third optical module of the first BRAS device are both dual-fiber bidirectional optical modules. The first optical module of the first OLT device is connected with the third optical module of the first BRAS device through two optical fibers, so as to form a first uplink routing link of the first OLT device. I.e. two optical fibers are used to implement the first uplink routing link.

Regarding how the first optical module of the first OLT device is connected to the third optical module of the first BRAS device through two optical fibers, description of uplink routing through two optical fibers by referring to the optical module of the OLT device in the prior art may be omitted here.

The second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through the OTN network, so as to form a second uplink routing link of the first OLT device. I.e. the second upstream routing link is implemented with the OTN network.

Regarding how the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through the OTN network, a mode that the second optical module of the first OLT device is connected to the uplink device through the OTN network may be referred to, and its implementation principle is similar, which will not be described herein.

Compared with the prior art, by adopting the implementation mode, the first OLT equipment can save the fiber core resource of one uplink routing link through the OTN network. According to the implementation mode, under the condition that the existing first OLT equipment is not changed to realize a physical single-route link, the first OLT equipment can realize physical double-route protection by means of an OTN network only by adding the second optical module, and engineering construction efficiency is higher.

In this implementation manner, if the machine room further deploys the second OLT apparatus, that is, the second OLT apparatus and the first OLT apparatus are located in the same machine room. The connection manner of the second OLT device with the first BRAS device and the second BRAS device may refer to several implementation manners of the second OLT device dual-route uplink BRAS device under the implementation manner 1 of the first OLT device dual-route uplink BRAS device specifically, which are not described herein again.

Implementation 3: the first OLT equipment is connected with the first BRAS equipment through the OTN, and is connected with the second BRAS equipment through the OTN, so that the dual-route protection is realized.

For example, the first optical module of the first OLT device and the third optical module of the first BRAS device are both dual-fiber bidirectional optical modules. The first optical module of the first OLT device is connected to the third optical module of the first BRAS device through an OTN network, so as to form a first uplink routing link of the first OLT device. That is, the first upstream routing link is implemented using an OTN network.

Regarding how the first optical module and the second optical module of the first OLT device are connected to the third optical module of the first BRAS device and the fourth optical module of the second BRAS device through the OTN network, the manner that the second optical module of the first OLT device is connected to the uplink device through the OTN network may be referred to, and the implementation principle is similar and will not be repeated.

Compared with the prior art, the physical dual-routing of the first OLT equipment can be realized by adopting the implementation mode without occupying a fiber core. In this implementation manner, if the machine room further deploys the second OLT apparatus, that is, the second OLT apparatus and the first OLT apparatus are located in the same machine room. The connection manner of the second OLT device with the first BRAS device and the second BRAS device may refer to several implementation manners of the second OLT device dual-route uplink BRAS device under the implementation manner 1 of the first OLT device dual-route uplink BRAS device specifically, which are not described herein again.

In the above-mentioned implementation modes 1 to 3, the second OLT apparatus is described by taking the dual-route uplink of the first BRAS apparatus and the second BRAS apparatus as an example. It should be understood that, in the above implementation manner, the second OLT device may also implement dual-route protection by means of dual-routing to connect to one BRAS device (i.e. the first BRAS device and the second BRAS device are the same device in the above example), or the second OLT device may also be connected to the BRAS device connected thereto in a single-route manner in the prior art as shown in fig. 1, which is particularly related to the architecture of the actual communication network, and this application is not limited thereto.

Second case: the first OLT equipment realizes the double-route protection of the first OLT equipment by connecting with a BRAS equipment. Regarding how the first OLT device is connected to one BRAS device to implement dual-route protection, the description of connecting the first OLT device to two BRAS devices may be referred to, and only the optical modules of the first BRAS device and the second BRAS device need to be disposed on the same BRAS device.

Taking the example that the first OLT device implements the first uplink routing link of the first OLT device through one optical fiber and the example that the second uplink routing link is implemented through the OTN network, assuming that the uplink device of the first OLT device is the third BRAS device, the following manner may be adopted to implement the dual-route protection:

Wherein the third BRAS device includes: a ninth light module and a tenth light module; the tenth optical module is a double-fiber bidirectional optical module. The first optical module of the first OLT device and the ninth optical module of the third BRAS device are both single-fiber bidirectional optical modules.

The first optical module of the first OLT device may be connected to the ninth optical module of the third BRAS device through an optical fiber, so as to form a first uplink routing link of the first OLT device. That is, the first uplink routing link may be implemented using one optical fiber.

Regarding how the first optical module of the first OLT device is connected to the ninth optical module of the third BRAS device through an optical fiber, description of the first uplink route implemented by the first optical module of the first OLT device through an optical fiber in the communication architecture provided in the embodiment of the present application may be omitted herein.

The second optical module of the first OLT device is connected to the tenth optical module of the third BRAS device through the OTN network, so as to form a second uplink routing link of the first OLT device. I.e. the second upstream routing link is implemented with the OTN network.

Regarding how the second optical module of the first OLT device is connected to the tenth optical module of the third BRAS device through the OTN network, a mode that the second optical module of the first OLT device is connected to the uplink device through the OTN network may be referred to, and its implementation principle is similar, which will not be described herein.

Compared with the prior art, by adopting the implementation mode, the first optical module of the first OLT equipment can realize the first uplink routing link of the first OLT equipment by adopting the single-fiber bidirectional optical module and only needing one fiber core resource, thereby saving the fiber core resource. Meanwhile, the first OLT equipment can save the fiber core resources of the second uplink routing link through the OTN network. According to the implementation mode, the physical double-route protection can be realized by means of the OTN network only through adding the second optical module to the first OLT equipment, and the engineering construction efficiency is higher.

In this implementation manner, if the machine room further deploys the second OLT apparatus, that is, the second OLT apparatus and the first OLT apparatus are located in the same machine room. Regarding how the second OLT device is connected to one BRAS device to implement dual-route protection, the description of connecting the first OLT device to two BRAS devices may be referred to, and only the optical modules of the first BRAS device and the second BRAS device need to be disposed on the same BRAS device.

It should be noted that, the foregoing implementation manner is described by taking the first OLT device dual-route uplink third BRAS device as an example. It should be understood that, in the above implementation manner, the second OLT device may also implement dual-route protection by connecting the same BRAS device (i.e., the third BRAS device in the above example) through dual-route, or the second OLT device may also implement dual-route by connecting another BRAS device through dual-route, or the second OLT device may also implement dual-route by connecting the first BRAS device and the second BRAS device through dual-route, or the second OLT device may also connect with the BRAS device connected thereto through a single-route in the prior art as shown in fig. 1, which is specifically related to the architecture of the actual communication network, which is not limited in this application.

As described in the foregoing embodiments of the present application, the present application may implement one or more routes of OLT devices and upstream devices using an OTN network. Therefore, the stability of the OLT apparatus can be further enhanced by means of a protection mechanism specific to the OTN network.

Taking the mode that the first OLT device and the second OLT device are connected with the two BRAS devices in an uplink mode as an example, under the scene, a special protection mechanism of the OTN network can be utilized to further strengthen the stability of the OLT devices. For example, the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through a first OTN routing link and a second OTN routing link in the OTN network, respectively; the sixth optical module of the second OLT device is connected to the eighth optical module of the second BRAS device through a third OTN routing link and a fourth OTN routing link in the OTN network, respectively.

In this scenario, the dual route protection may include, for example, at least one of:

1. subnet connectivity protection (SubNetwork Connection Protection, SNCP)

The OTN network service layer is provided with SNCP protection. The SNCP protection adopts a protection mechanism of 'double-sending' and 'selective receiving', namely, an OTN device of a service on an access OLT side is double-sent to a main routing channel (i.e. a working channel) and a standby routing channel (i.e. a protection channel), and the service is selected and received on an OTN device on a BRAS side of a metropolitan area network.

Fig. 6 is a schematic flow diagram of a service flow of a subnet connection protection, as shown in fig. 6, taking a connection of a second optical module (i.e., a illustrated a end) of a first OLT device with a fourth optical module (i.e., a illustrated Z end) of a second BRAS device through a first OTN routing link, a second OTN routing link, and a first OTN routing link in an OTN network, respectively, as an example:

the first OTN routing link is a main routing channel, namely, a graphical aggregation 1, an aggregation 2, a core, an aggregation 5 and an aggregation 6; the second OTN routing link is a backup routing channel, i.e., aggregation 3-aggregation 4-core-aggregation 7-aggregation 8 is illustrated. The main and standby double-route forms SNCP protection together.

The second optical module of the first OLT device sends the data service request sent by the user device to the first OLT device through the ONU to the main routing channel and the standby routing channel, respectively, and in a normal case, the fourth optical module of the second BRAS device selects to receive the service request from the main routing channel. Once the primary routing channel fails, the fourth optical module of the second BRAS device receives traffic from the backup routing channel.

The service data flow direction of the sixth optical module of the second OLT device, which is connected to the eighth optical module of the second BRAS device through the third OTN routing link and the fourth OTN routing link in the OTN network, may refer to the service data flow direction, and will not be described herein.

Under SNCP protection, even if the main route channel in the OTN between the OLT equipment and the BRAS equipment fails, the OLT equipment can use the standby route channel in the OTN to transmit the service, thereby ensuring the reliability of the service.

For other implementation manners of implementing dual-route uplink by using the OTN network in the embodiment of the present application, reference may be made to the service transmission path protected by the SNCP, and the same technical effects may be obtained, which will not be described herein.

2. Optical multiplexing section protection (Optical Multiplex Section Protect, OMSP)

The OTN devices of the convergence layer in each OTN routing link adopt two-way routing connection, that is, the primary routing (i.e. working optical fiber) and the standby routing (i.e. protection optical fiber) together form OMSP protection. OMSP protection is only protected for the optical line (i.e. optical fiber).

Fig. 7 is an optical signal flow direction diagram of optical multiplexing section protection, as shown in fig. 7, taking OTNi devices and otni+1 devices of a convergence layer as examples, where i is an integer greater than or equal to 1.

An optical conversion unit (Optical Transform Unit, OTU) in the OTNi device is connected TO an optical signal, a Multiplexer (MUX) synthesizes the connected optical signals into a single optical signal, the single optical signal is transmitted TO an OLP board through a TI port of an optical fiber line automatic switching protection (Optical Fiber Line Auto Switch Protection, OLP) board, an optical splitter in the OLP board divides the optical signal into two parts, the two parts are respectively transmitted TO an optical amplifier (Optical Amplifier, OA) through a TO1 port and a TO2 port of the OLP board TO amplify the optical signal, an optical fiber interface unit (Fiber Interface Unit, FIU) transmits the amplified optical signal TO a line optical fiber, and the optical signal reaches the FIU of the otni+1 device along the line optical fiber.

The optical switch in the OLP board is usually arranged on the main routing channel, so that the OLP board receives the optical signal of the main routing and transmits the optical signal to a Demultiplexer (DMUX) through the RO port, and the DMUX separates and transmits the optical signal to the OTU of the otni+1 device. The OTU of the otni+1 device transmits the optical signal to the OTU of the OTNi device in the same path.

Typically, an optical switch is placed on the primary routing channel and a receiving end receives signals from the primary routing channel. Once the system detects the cracking of the physical light path quality or the interruption of the optical cable, an optical switch in the OLP veneer can be automatically switched to the standby route channel under the condition that a client does not have the network interruption perception, and a receiving end receives a signal from the standby route channel.

Under the protection of OMSP, even if the optical path of the main route channel between OTN devices is cracked or the optical cable is interrupted, the OTN devices can also transmit optical signals by using the standby route channel, thereby ensuring the smooth transmission of the optical signals.

For other implementation manners of implementing dual-route uplink by using the OTN network in the embodiment of the present application, reference may be made to the optical signal transmission path protected by the OMSP, and the same technical effects may be obtained, which will not be described herein.

3. Linear multiplex section protection (Linear Multiplex Section Protection, LMSP)

The OTN devices of the core layer in each OTN routing link adopt two-way routing connection, namely, a main route (i.e. a working channel) and a standby route (i.e. a protection channel) together form LMSP protection. LMSP protection also employs a "dual-transceiver" mechanism to achieve protection between core layer OTN devices.

Fig. 8 is a signal flow diagram of linear multiplexing segment protection. As shown in fig. 8, after receiving a data packet from an OLT device, an a end (i.e. an OLT-side OTN device) packages the data packet into signals capable of being transmitted by an OTN system at an OTUk level through a series of wave division technologies such as encapsulation and add-drop multiplexing inside the OTN, and then sends the signals to a primary route and a standby route, and a Z end (a BRAS-side OTN device) performs signal selection and reception.

Taking implementation mode 1 of the dual-route uplink BRAS device of the first OLT device as an example, namely, the a end is a first OTN device connected with the first OLT device, and the Z end is a second OTN device connected with the second BRAS device. The specific signal flow direction is as follows:

Normally, the a-side double signaling flow direction is as follows:

and (3) main routing: end A, convergence 1, convergence 2, core A, core B, convergence 5, convergence 6 and end Z.

Standby routing: a end-convergence 3-convergence 4-core C-core D-convergence 7-convergence 8-Z end.

The Z-side selects and receives signals on one of the routes, e.g., selects and receives signals on the primary route. Then, when the Z-terminal replies, the reply signal can be returned to the a-terminal in the same path.

If the problem of route interruption occurs between the aggregation 1 and the aggregation 2, the signal of the main route cannot be sent to the Z-terminal device, and the Z-terminal device can select the signal from the standby route to receive through a receiving selection mechanism.

Alternatively, if an interrupt occurs between cores C, D at this point, the Z-side device cannot receive signals from the alternate route. If LMSP protection is enabled in the core loop, at this time, a fault occurs between the aggregation 7 and the aggregation 8, and the signal flow becomes as follows through the LMSP protection mechanism:

end A, convergence 3, convergence 4, core C, core B, convergence 5, convergence 6 and end Z.

And the loop of the core layer is protected by LMSP, and even if the main route between the OTN devices of the core layer is interrupted, the OTN devices can also transmit signals by using the standby route, so that the smooth transmission of the signals is ensured.

For other implementation manners of implementing dual-route uplink by using the OTN network in the embodiment of the present application, reference may be made to the signal transmission path protected by the LMSP, and the same technical effects may be obtained, which is not described herein again.

4. OTN System hard channel characterization

In the prior art, OLT devices use soft channels for communication. That is, a plurality of user equipments share the same router on the OLT equipment side through the ONUs. The OLT equipment encapsulates data sent by the user equipment to the OLT equipment through the ONU into data packets, the data packets are sent to a router at the side of the OLT equipment through an optical fiber, the input port of the router at the side of the OLT equipment can be used for grouping the data packets from the OLT equipment, and then the data packets are unpacked; after the unpacking is finished, the router checks the value of a field (namely a target address) in the header of the data packet, and after the address information is obtained, the data is unpacked into the data packet again and is forwarded to an output port of the router; and then the output port of the router searches for a target address according to the forwarding table and forwards the data packet to the target address. If there are more data packets, the processing speed is slower, and queuing may occur.

When the OLT apparatus uses the soft channel to perform communication, the mechanism of forwarding, queuing, routing, addressing and forwarding is repeated every time a convergence (core) node passes.

In terms of network quality, when a soft channel is used for communication, data packets need to be unpacked, and only one packet can be processed in one unit time, so that when the number of the data packets is large, the situation that queuing is needed occurs, and thus the transmission quality problems such as congestion, delay accumulation and the like are caused.

In terms of network security, service information carried by a private line can be easily obtained through packet capturing and interception tools, then data packets can be intercepted and unpacked through the tools, and then partial information (such as symbols) in the data packets is modified, so that a link is damaged, and finally information is lost or leaked.

In the communication architecture provided in the embodiments of the present application, OLT devices communicate using a hard channel.

Hard channel: the minimum particle of the current main stream branch side foundation (i.e. the docking service board) of the OTN device is ODU0 (channel capacity is 1.25G), and one user device enjoys one particle channel of the OTN device connected to the OLT device through the ONU. That is, after the OLT encapsulates the data sent by the user device to the OLT device through the ONU into a data packet, the OLT device sends the data packet to the docking service board of the OTN device, and the docking service board of the OTN device sends the data packet to the BRAS device through the particle channel of the OTN device, and the entire ODU0 (1.25G) channel is used by one user device, so that the situation that multiple user devices share the same particle cannot occur.

The hard channels have a "dedicated + transparent" transport property, dedicated meaning that each particle channel is shared for each customer; transparent means that the OTN device directly transmits the data packet sent by the OLT device, and does not decapsulate the data packet.

In terms of network quality, because each user equipment shares a particle channel, a repeated mechanism of a soft channel does not exist through each convergence (core) node, so that no congestion exists in data transmission, and the time delay can be ensured.

In terms of network security, because OTUk is used as a signal transmission in the OTN network transmission process, and the frame is first to be parsed for service information carried by a dedicated line, general enterprises and individuals have fewer wave-related devices, so that information cannot be easily obtained.

Second, OTN employs a time division multiplexing technique to divide one channel into a plurality of time slots. For example, in an OTN network, a time slot from ODUflex0 to ODUflex80 is located in one 100G channel, to obtain information of a certain user needs to be accurately located in the time slot where the client is located, and the OTN device is used to unpack the information into an ethernet signal, and then the ethernet signal is unpacked layer by layer, so that it is possible to obtain the signal of the client after frame, packet, and segment unpacking the ethernet signal. Thus, the safety of hard pipeline business is ensured in terms of an implementation mechanism.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A communication network architecture, the communication network architecture comprising: the system comprises first OLT equipment and an OTN network;

the first optical module of the first OLT equipment is connected with the uplink equipment to form a first uplink routing link of the first OLT equipment, and the second optical module of the first OLT equipment is connected with the uplink equipment through the OTN network to form a second uplink routing link of the first OLT equipment;

The first optical module is a single-fiber bidirectional optical module;

the first optical module of the first OLT equipment is connected with the uplink equipment through an optical fiber;

the uplink device of the first OLT device includes: the first BRAS device and the second BRAS device; wherein the first BRAS device includes: a third optical module, the second BRAS device comprising: the third optical module is a single-fiber bidirectional optical module, and the fourth optical module is a double-fiber bidirectional optical module;

2. The communication network architecture of claim 1, further comprising: the second OLT equipment and the first OLT equipment are positioned in the same machine room;

3. The communication network architecture of claim 2, wherein the fifth optical module and the seventh optical module are each single-fiber bi-directional optical modules, and the sixth optical module and the eighth optical module are each dual-fiber bi-directional optical modules;

4. The communication network architecture of claim 2, wherein the fifth optical module, the sixth optical module, the seventh optical module, and the eighth optical module are all two-fiber bi-directional optical modules;

5. The communication network architecture of any of claims 2-4, wherein traffic handled by the first OLT apparatus is different from traffic handled by the second OLT apparatus.

6. The communication network architecture of any one of claims 2-4, wherein,

the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through a first OTN routing link and a second OTN routing link in the OTN network, respectively;

7. The communication network architecture of claim 6, wherein a dual-routing connection is employed between OTN devices of a convergence layer in each OTN routing link;

and/or, the OTN devices of the core layer in each OTN routing link adopt two-way routing connection.

8. The communication network architecture of claim 1, wherein the upstream device of the first OLT device is a third BRAS device; wherein the third BRAS device includes: the optical system comprises a ninth optical module and a tenth optical module, wherein the ninth optical module is a single-fiber bidirectional optical module, and the tenth optical module is a double-fiber bidirectional optical module;