CN114697773A - Communication network architecture - Google Patents

Abstract

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

Description

Communication network architecture

Technical Field

The present application relates to communications technologies, and in particular, to a communications network architecture.

Background

With the development and iteration of Networks, the existing network gradually develops from hundreds of megabits to gigas, the broadband access requirement is continuously increased, and the current Gigabit-Capable Passive Optical network (10G PON) technology is the latest generation broadband Passive Optical integrated access standard. It is based on an extension of the GPON network, providing 10Gbit/s of available bandwidth. A GPON network formed by the GPON technology includes an Optical Line Terminal (OLT) device installed in a machine room, and is used to complete service access of an access network.

At present, an OLT device of a computer room adopts a whole-course bare fiber mode to implement a physical single-route uplink Broadband Access Server (BRAS) device. That is, one OLT device uses two optical fibers (i.e., two cores) in the optical fiber cable to complete physical single-route uplink of one BRAS device, where 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 OLT equipment in the machine room.

Disclosure of Invention

The application provides a communication network architecture for solve because of the not enough problem of computer lab fibre core resource, lead to the problem that can't realize the protection of physics dual route for the OLT equipment in the computer lab.

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

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

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

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: a first BRAS device and a second BRAS device; wherein the first BRAS device comprises: 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 dual-fiber bidirectional optical module;

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

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

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

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

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 dual-fiber bidirectional optical modules;

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

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

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

a sixth optical module of the second OLT device is connected with an eighth optical module of the second BRAS device through two optical fibers 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 service processed by the first OLT device is different from the service processed 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, dual-routing connection is adopted between the OTN devices of the aggregation layer in each OTN routing link and/or dual-routing connection is adopted between the OTN devices of the 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 comprises: the optical module 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;

a first optical module of the first OLT device is connected with a ninth optical module of the third BRAS device through a third optical fiber to form a first uplink routing link of the first OLT device; the second optical module of the first OLT device is connected with 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.

According to the communication network architecture provided by the application, the first OLT equipment can realize an uplink routing link through the OTN, 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, part of the fiber core resource can be saved while the double-route protection is realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present 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 an OLT device and a BRAS device 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 bidirectional optical module;

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

fig. 6 is a schematic view of traffic flow for subnet connection protection;

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

fig. 8 is a signal flow diagram of linear multiplex section protection.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.

Detailed Description

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

The GPON network formed by adopting the GPON technology comprises: an Optical Network Unit (ONU), an Optical Distribution Network (ODN), and an OLT. The OLT equipment is connected with at least one ODN in a downstream mode, and each ODN is connected with at least one ONU located on a user side. And the OLT equipment is connected with the BRAS equipment. Namely, the BRAS device is an upstream device of the OLT device.

The GPON network formed by the GPON technology carries under gigabit traffic. When the user equipment uses a certain service through the GPON network, for example, taking the request for providing service data such as voice, data, video and the like 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 equipment transmits the service request to the service responder through the internet, and receives the response data of the responder through the internet. The BRAS device may then send the response data to the OLT device to cause the OLT device to send the response data to the user device along the original path.

In the prior art, physical single-route connection is realized between the OLT device and the BRAS device in a full-process bare fiber manner. The bare fiber means that the optical fiber is jumped between two communication parties only through a distribution frame or a distribution box without any switch or router.

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 a dual-fiber bidirectional optical module, and each dual-fiber bidirectional optical module includes: a transmit port and a receive port.

The transmitting port of the dual-fiber bidirectional optical module of the OLT equipment is connected with the receiving port of the dual-fiber bidirectional optical module of the BRAS equipment through one fiber core of the bare fiber, and the transmitting port is used for the OLT equipment to transmit data to the BRAS equipment to form a single-route uplink between the OLT equipment and the BRAS equipment.

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

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

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

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

The OLT equipment adopts one double-fiber bidirectional optical module, 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, so that double-route uplink of the OLT equipment is realized.

In this implementation, even if one uplink route of the OLT device fails, the OLT device may implement communication through another route to ensure reliability of traffic.

However, when the scheme shown in fig. 2 is used to implement the dual-route uplink of the OLT device, more fiber core resources are occupied in the machine room. When a plurality of OLT equipment are deployed in a machine room, the situation that the double-route protection of the OLT equipment is difficult to realize due to insufficient fiber core resources of the machine room is easy to occur.

An Optical Transport Network (OTN) Network is a ring Transport Network formed by a plurality of OTN devices, and can implement Transport, multiplexing, routing, and 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 different traffic from the OLT equipment. The core layer carries all traffic from the convergence layer.

The inventor finds out through research that the OTN network comprises OTN equipment arranged in each computer room. Therefore, through the OTN network, communication can be realized between devices located in any two rooms through the OTN network. In view of this, the present application provides a communication architecture for implementing dual-route uplink of an OLT device with the help of a constructed OTN network, so that the OLT device can be connected with its uplink device with the help of the OTN network without using additional fiber core resources, thereby solving the problem that dual-route protection of the OLT device cannot be implemented due to insufficient fiber core resources.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated 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: a first OLT device and an OTN network.

The first OLT apparatus comprises a first optical module and a second optical module. The second optical module is a dual-fiber bidirectional optical module. The dual-fiber bidirectional optical module is characterized in that the optical module has two ports, wherein one port is a receiving port, the other port is a transmitting port, the optical module transmits an optical signal through one optical fiber, and the other optical fiber is used for receiving the optical signal, namely, the dual-fiber bidirectional optical module is formed.

In this embodiment, the first optical module of the first OLT device is connected to the upstream device to form a first upstream routing link of the first OLT device. The second optical module of the first OLT device is connected to the upstream link device through the OTN network, so as to form a second upstream link routing link of the first OLT device.

The sending port and the receiving port of the second optical module of the first OLT device are connected to the OTN device in the same computer room as the first OLT device in the OTN network through one hop fiber (i.e., the second optical module is connected to two hop fibers), and the OTN device is connected to the uplink device through two hop fibers.

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

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

the implementation mode is as follows: the first optical module of the first OLT device is a single-fiber bidirectional optical module. The single-fiber bidirectional optical module comprises a built-in Wavelength Division Multiplexing (WDM) filter and a transceiving port. The optical module can distinguish wavelength signals in the transmitting and receiving directions by using the WDM filter, so that the optical module can simultaneously realize transmitting and receiving through optical signals with different wavelengths on one optical fiber so as to realize full-duplex work. Fig. 4 is a schematic diagram of the operating principle of the single-fiber bidirectional optical module. As shown in fig. 4, the uplink may use an optical signal having a wavelength of 1310 nm (Nanometer, nm), and the downlink may use an optical signal having a wavelength of 1550 nm. Through the single-fiber bidirectional optical module, the receiving and the transmitting can be realized by only adopting 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 to say, in this implementation manner, only one fiber core resource is needed to implement the physical dual-route uplink of the first OLT device, and therefore, the fiber core resource during the physical dual-route uplink of the OLT device can be saved.

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

In a possible implementation manner, the 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 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.

As to how the first optical module of the first OLT apparatus implements the first uplink routing through two optical fibers, reference may be made to description of how the optical module of the OLT apparatus implements the uplink routing through two optical fibers in the prior art, and details are not described here again.

Compared with the prior art, by adopting the implementation mode, the first OLT equipment can save fiber core resources of one uplink routing link through the OTN. According to the implementation mode, under the condition that the physical single-route link is realized by the existing OLT equipment, the physical double-route protection can be realized only by adding the second optical module and by means of the OTN, and the 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, so as to form a first uplink routing link of the first OLT device. The second optical module of the first OLT device is also connected to the uplink device through the OTN network, so as to form a second uplink routing link of the first OLT device. That is, both uplink routes of the first OLT device are implemented through the OTN network.

How to implement the first uplink routing through the OTN by the first optical module of the first OLT device may refer to description of how to implement the second uplink routing through the OTN by the second optical module of the first OLT device, which is not described herein again.

Compared with the prior art, the implementation mode is adopted, the physical double-route of the first OLT equipment can be realized without occupying the fiber core.

It should be understood that the uplink device in the above embodiments may be, for example, a BRAS device, or may be another device located in an uplink of an OLT device and used for communicating with the OLT device, which is not limited in this application. For convenience of description, the following embodiments are all described by taking the above-mentioned associated device as a BRAS device as an example.

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

in the first case: the first OLT equipment realizes the double-route protection of the first OLT equipment in a mode of connecting two BRAS equipment. That is, the uplink device of the first OLT device includes a first BRAS device and a second BRAS device. The first BRAS device comprises: a third optical module, the second BRAS device comprising: and the fourth optical module is a dual-fiber bidirectional optical module.

In this case, the first OLT device may have the following two implementations:

implementation mode 1: the first OLT equipment is connected with the first BRAS equipment through an optical fiber and connected with the second BRAS equipment through an OTN (optical transport 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 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 can be implemented by using one optical fiber.

As to 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, reference may be made to the description that the first optical module of the first OLT device implements the first uplink routing through an optical fiber in the communication architecture provided in this embodiment of the present application, and details are not described here again.

The second optical module of the first OLT device is connected with 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 may be implemented using an OTN network.

How to connect the second optical module of the first OLT device with the fourth optical module of the second BRAS device through the OTN network may refer to the description that the second optical module of the first OLT device implements the second uplink routing through the OTN network, and is not described herein again.

In this implementation, fig. 5 is a schematic diagram of a traffic data flow between the OLT and the BRAS. As shown in fig. 5, taking the traffic data flow between the first OLT device and the first and second BRAS devices as an example, that is, the first OLT device receives a data traffic request sent by the user equipment to the first OLT device through the ONU, and sends the data traffic request to the first and second BRAS devices, respectively. The first OLT equipment sends the data service request to the first BRAS equipment through an optical fiber to realize service transmission of a first uplink routing link of the first OLT equipment; 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 equipment and the second BRAS equipment send the service request to the service responder through the Internet, and receive the response data of the responder through the Internet. 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, the fiber core resources can be saved by adopting the single-fiber bidirectional optical module and utilizing the OTN network. On the basis of saving fiber core resources, the first OLT equipment realizes double-route protection by connecting the two BRAS equipment, so that if one BRAS equipment fails, the other BRAS equipment can be used for service transmission, and the reliability of services is ensured.

In this implementation manner, if the machine room is also deployed with the second OLT device, that is, the second OLT device and the first OLT device are located in the same machine room. The second OLT device may connect with the first BRAS device and the second BRAS device in several ways:

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

Mode 1: the second OLT equipment is connected with the first BRAS equipment through an optical fiber and connected with the second BRAS equipment through an OTN (optical transport network) to realize double-route protection. Namely, 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 dual-fiber bidirectional optical modules.

And 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. That is, the first uplink routing link can be implemented by using one optical fiber.

How to connect the fifth optical module of the second OLT device with the seventh optical module of the first BRAS device through one optical fiber may refer to a description that the first optical module of the first OLT device realizes the first uplink routing through one optical fiber in the communication architecture provided in the embodiment of the present application, and is not described again here.

And 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 to form a second uplink routing link of the second OLT device. That is, the second uplink routing link may be implemented using an OTN network.

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 may refer to the description that the second optical module of the first OLT device is connected to the uplink device through the OTN network, which is similar to the implementation principle and is not described again.

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

Take the example of single-route uplink connection between the first OLT device and the first BRAS device by using two fiber cores before the first OLT device. In this embodiment, a first optical module is set for the first OLT device, and is connected to the third optical module of the first BRAS device by using an optical fiber in the original physical single-route link of the first OLT device, and the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device by using the OTN network.

And a fifth optical module of the second OLT equipment is connected with a seventh optical module of the first BRAS equipment by using another optical fiber in the original physical single-route link of the first OLT equipment, and a sixth optical module of the second OLT equipment is connected with an eighth optical module of the second BRAS equipment by using an OTN (optical transport network).

The existing fiber core resources of the machine room can be fully utilized through the implementation mode, a new optical cable does not need to be laid, and the 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 (optical transport network) to realize double-route protection. Namely, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all dual-fiber bidirectional optical modules.

And 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. That is, the first uplink routing link is implemented using two optical fibers.

How to connect the fifth optical module of the second OLT device with the seventh optical module of the first BRAS device through two optical fibers may refer to a description that the optical module of the OLT device implements uplink routing through two optical fibers in the prior art, and is not described herein again.

And 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 to form a second uplink routing link of the second OLT device. That is, the second upstream routing link is implemented using an OTN network.

Regarding that 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 the 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 described again.

Compared with the prior art, by adopting the implementation mode, the second OLT equipment can save fiber core resources of one uplink routing link through the OTN. 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 only by adding the sixth optical module and with the help of an OTN network, and the engineering construction efficiency is higher.

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

And the fifth optical module of the second OLT equipment is connected with the seventh optical module of the first BRAS equipment through an OTN (optical transport network) to form a first uplink routing link of the second OLT equipment. That is, the first upstream routing link is implemented using an OTN network.

And 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 to form a second uplink routing link of the second OLT device. That is, the second upstream routing link is implemented using an OTN network.

How to connect the fifth optical module and the sixth optical module of the second OLT device with the seventh optical module of the first BRAS device and the eighth optical module of the second BRAS device through the OTN network, a manner in which the second optical module of the first OLT device is connected with the uplink device through the OTN network may be referred to, which is similar to the implementation principle and is not described again.

Compared with the prior art, the implementation mode is adopted, the physical double-route of the first OLT equipment can be realized without occupying the fiber core.

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 two optical fibers, and double-route protection is achieved. Namely, the fifth optical module, the sixth optical module, the seventh optical module and the eighth optical module are all dual-fiber bidirectional optical modules.

And 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. That is, the first uplink routing link is implemented using two optical fibers.

And the sixth optical module of the second OLT equipment is connected with the eighth optical module of the second BRAS equipment through two optical fibers to form a second uplink routing link of the second OLT equipment. That is, two optical fibers are used to implement the second uplink routing link.

How to connect the fifth optical module and the sixth optical module of the second OLT device with the seventh optical module of the first BRAS device and the eighth optical module of the second BRAS device through two optical fibers may refer to a description that the optical module of the OLT device implements uplink routing through two optical fibers in the prior art, 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, and double-route protection is achieved. The fifth optical module and the eighth optical module are both single-fiber bidirectional optical modules, and the sixth optical module and the seventh optical module are both dual-fiber bidirectional optical modules.

And 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. That is, the first uplink routing link is implemented by using one optical fiber.

How to connect the fifth optical module of the second OLT device with the seventh optical module of the first BRAS device through one optical fiber may refer to a description that the first optical module of the first OLT device implements the first uplink routing through one optical fiber in the communication architecture provided in the embodiment of the present application, and is not described again here.

The sixth optical module of the second OLT apparatus and the eighth optical module of the second BRAS apparatus are connected by two optical fibers to form a second uplink routing link of the second OLT apparatus. That is, the first uplink routing link is implemented using two optical fibers.

How to connect the sixth optical module of the second OLT device with the eighth optical module of the second BRAS device through two optical fibers may refer to a description that the optical module of the OLT device implements uplink routing through two optical fibers in the prior art, and is not described herein again. Compared with the prior art, by adopting the implementation mode, the fifth optical module of the second OLT equipment adopts the single-fiber bidirectional optical module, and only one fiber core resource is needed to realize the first uplink routing link of the second OLT equipment, so that the fiber core resource is saved.

It should be noted that, the foregoing several manners are only exemplary and show how to implement the dual-route protection by the second OLT device located in the same room as the first OLT device when the first OLT device is connected to the first BRAS device through one optical fiber and connected to the second BRAS device through the OTN. It should be understood that in the above implementation manner of the route dual protection of the second OLT device, the positions of the first BRAS device and the second BRAS device may be interchanged, that is, the second OLT device may implement the route uplink with the first BRAS device in the manner of implementing the route uplink with the second BRAS device described above. Correspondingly, the second OLT device may implement the route uplink with the second BRAS device by using the aforementioned manner of implementing the route uplink with the first BRAS device, which is not described again.

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

Implementation mode 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 an OTN (optical transport network), and double-route protection is achieved.

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. That is, the first uplink routing link is implemented using two optical fibers.

How to connect the first optical module of the first OLT device with the third optical module of the first BRAS device through the two optical fibers may refer to a description that the optical module of the OLT device implements uplink routing through the two optical fibers in the prior art, and is not described herein again.

The second optical module of the first OLT device is connected with 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 upstream routing link is implemented using an OTN network.

How to connect the second optical module of the first OLT device with the fourth optical module of the second BRAS device through the OTN network can refer to a manner in which the second optical module of the first OLT device is connected with the uplink device through the OTN network, which is similar to the implementation principle and is not described again.

Compared with the prior art, by adopting the implementation mode, the first OLT equipment can save fiber core resources of one uplink routing link through the OTN. 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 only by adding the second optical module and with the help of an OTN network, and the engineering construction efficiency is higher.

In this implementation manner, if the machine room is also deployed with the second OLT device, that is, the second OLT device and the first OLT device are located in the same machine room. As to the connection manner of the second OLT device with the first BRAS device and the second BRAS device, some implementation manners of the second OLT device dual-route uplink BRAS device under implementation manner 1 of the first OLT device dual-route uplink BRAS device may be specifically referred to, and details are not described here.

Implementation mode 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 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 the 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.

The second optical module of the first OLT device is connected with 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 upstream routing link is implemented using an OTN network.

How to connect the first optical module and the second optical module of the first OLT device with the third optical module of the first BRAS device and the fourth optical module of the second BRAS device through the OTN network, the method of connecting the second optical module of the first OLT device with the uplink device through the OTN network may be referred to, and the implementation principle is similar, and details are not repeated here.

Compared with the prior art, the implementation mode is adopted, the physical dual-routing of the first OLT equipment can be realized without occupying fiber cores. In this implementation manner, if the machine room is also deployed with the second OLT device, that is, the second OLT device and the first OLT device are located in the same machine room. As to the connection mode of the second OLT device, the first BRAS device, and the second BRAS device, reference may be made to several implementation modes of the second OLT device dual-route uplink BRAS device in implementation mode 1 of the first OLT device dual-route uplink BRAS device, which is not described herein again.

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

In the second case: the first OLT equipment realizes the double-route protection of the first OLT equipment by connecting one BRAS equipment. As to how the first OLT device connects to one BRAS device to implement dual-route protection, reference may be made to the description of connecting two BRAS devices to the first OLT device, and only optical modules of the first BRAS device and the second BRAS device need to be disposed on the same BRAS device.

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

wherein the third BRAS device comprises: a ninth optical module and a tenth optical module; wherein, the tenth optical module is a two-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 can be implemented by using one optical fiber.

As to 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, reference may be made to the description that the first optical module of the first OLT device implements the first uplink routing through an optical fiber in the communication architecture provided in this embodiment of the present application, and details are not repeated here.

The second optical module of the first OLT device is connected with 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. That is, the second upstream routing link is implemented using an OTN network.

How to connect the second optical module of the first OLT device with the tenth optical module of the third BRAS device through the OTN network can refer to a manner in which the second optical module of the first OLT device is connected with the uplink device through the OTN network, which is similar to the implementation principle and is not described again.

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 only by using one fiber core resource by adopting the single-fiber bidirectional optical module, so that the fiber core resource is saved. Meanwhile, the first OLT equipment can save the fiber core resource of the second uplink routing link through the OTN. According to the implementation mode, physical dual-route protection can be realized only by adding the second optical module to the first OLT device and by means of the OTN, and the engineering construction efficiency is higher.

In this implementation manner, if the machine room is also deployed with the second OLT device, that is, the second OLT device and the first OLT device are located in the same machine room. As to how the second OLT device connects to one BRAS device to implement dual-route protection, reference may be made to the description of connecting two BRAS devices to the first OLT device, and only 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 above implementation manner is described by taking the first OLT device as an example to perform dual-route uplink of the third BRAS device. It should be understood that, in the above implementation, the second OLT device may also implement dual-route protection by using a dual-route uplink to the same BRAS device (i.e. the third BRAS device in the above example), or the second OLT device may also implement dual-route uplink to another BRAS device by using a dual-route uplink, or the second OLT device may also implement dual-route by using a dual-route uplink to the first BRAS device and the second BRAS device, or the second OLT device may also connect to the BRAS device connected thereto by using a single-route manner in the prior art as shown in fig. 1, which is specifically related to the architecture of the actual communication network, and this application is not limited thereto.

As described in the foregoing embodiments of the present application, the present application may utilize an OTN network to implement one or more routes between an OLT device and an uplink device. Therefore, the stability of the OLT device can also be further enhanced by means of protection mechanisms specific to the OTN network.

Taking the example that the first OLT device and the second OLT device both implement dual-route protection by means of linking up two BRAS devices, in this scenario, a special protection mechanism of the OTN network may be used to further enhance the stability of the OLT device. For example, the second optical module of the first OLT device is connected to the fourth optical module of the second BRAS device through the first OTN routing link and the 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.

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

1. sub-network Connection Protection (SNCP)

The OTN network service layer has SNCP protection. The SNCP protection adopts a protection mechanism of 'double sending' and 'selective receiving', that is, the OTN equipment of the service at the side of the access OLT is sent to the main route channel (namely, a working channel) and the standby route channel (namely, a protection channel) in a double way, and the OTN equipment at the side of the metropolitan area network BRAS is selected and received for the service.

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

the first OTN routing link is an active routing channel, namely, a graphic aggregation 1, an aggregation 2, a core, an aggregation 5 and an aggregation 6; the second OTN routing link is a standby routing channel, i.e., shown as convergence 3-convergence 4-core-convergence 7-convergence 8. The active and standby dual routes jointly form SNCP protection.

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

Regarding the traffic data flow direction in which the sixth optical module of the second OLT device 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, the above-mentioned traffic data flow direction may be referred to, and is not described herein again.

Under the protection of SNCP, even if the main routing channel in the OTN between the OLT equipment and the BRAS equipment fails, the OLT equipment can also utilize the standby routing 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 an OTN network in the embodiment of the present application, the service transmission path protected by the SNCP may be referred to, and the same technical effect may be obtained, which is not described herein again.

2. Optical Multiplex Section Protection (OMSP)

The OTN devices of the convergence layer in each OTN routing link are connected by adopting double routes, namely, an active route (namely, a working optical fiber) and a standby route (namely, a protection optical fiber) jointly form OMSP protection. The OMSP protection is only for optical lines (i.e. optical fibres).

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

An Optical conversion Unit (OTU) in the OTNi device accesses an Optical signal, a Multiplexer (MUX) synthesizes the accessed Optical signal into a single Optical signal, a TI port of an Optical Fiber Line Auto Switch Protection (OLP) single plate transmits the single Optical signal TO an OLP single plate, an Optical splitter in the OLP single plate equally divides the Optical signal into two parts, and transmits the two parts TO an Optical Amplifier (Optical Amplifier, OA) through a TO1 port and a TO2 port of the OLP single plate 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 a FIU of the OTNi +1 device along the Line Optical Fiber.

The FIU of the OTNi +1 device receives an optical signal sent by the OTNi device from the line optical fiber, amplifies the optical signal by the OA amplifier, and transmits the optical signal to the OLP board through an RI1 port and an RI2 port of the OLP board, respectively, where an optical switch in the OLP board is usually opened in an active routing channel, so that the OLP board receives the optical signal of the active routing and transmits the optical signal to a Demultiplexer (DMUX) through an RO port, and the DMUX separates the optical signal 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.

Normally, the optical switch is turned on the active routing channel, and the receiving end receives the signal from the active routing channel. Once the system detects the cracking of the physical optical path quality or the interruption of the optical cable, the optical switch in the OLP board will automatically switch to the standby routing channel under the condition that the customer does not sense the network interruption, and the receiving end receives the signal from the standby routing channel.

Under the protection of OMSP, even if the optical path of the main routing channel between the OTN equipment is cracked in quality or the optical cable is interrupted, the OTN equipment can also utilize the standby routing channel to transmit optical signals, and the smooth transmission of the optical signals is ensured.

For other implementation manners of implementing dual-route uplink by using an 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 effect may be obtained, which is not described herein again.

3. Linear Multiplex Section Protection (Linear Multiplex Section Protection, LMSP)

The OTN devices of the core layer in each OTN routing link are connected by double routes, that is, an active route (i.e., a working channel) and a standby route (i.e., a protection channel) jointly form LMSP protection. LMSP protection also employs a "dual-transmit selective-receive" mechanism to achieve protection between core layer OTN devices.

Fig. 8 is a signal flow diagram of linear multiplex section protection. As shown in fig. 8, after receiving a data packet from the OLT device, the a end (i.e., the OLT-side OTN device) packages the data packet into signals at OTUk level that can be transmitted in the OTN system by using a series of wavelength division technologies such as encapsulation and add/drop multiplexing inside the OTN, and then sends the signals to the active route and the standby route in a dual-mode, and performs signal selection and reception at the Z end (the BRAS-side OTN device).

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

under normal conditions, the A-terminal double-transmission signal flows as follows:

primary routing: end A, convergence 1, convergence 2, core A, core B, convergence 5, convergence 6 and end Z.

Standby routing: the A end, the convergence 3, the convergence 4, the core C, the core D, the convergence 7, the convergence 8 and the Z end.

The Z terminal selects and receives a signal on one of the routes, for example, selects and receives a signal on the active route. Then, when the terminal Z replies, the reply signal can be returned to the terminal a by the same path.

If the problems of route interruption and the like occur between the convergence 1 and the convergence 2, at this time, the signal of the main route cannot be sent to the Z-end device, and the Z-end device selects the signal from the standby route to receive through the selection and reception mechanism.

Alternatively, if there is a break between the cores C, D at this time, the Z-side device cannot receive signals from the alternate route. If LMSP protection is enabled in the core loop, and a fault occurs between the convergence 7 and the convergence 8, the signal flow will be changed as follows through the LMSP protection mechanism:

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

The LMSP protection is adopted in the core layer loop, even if the main route between the core layer OTN equipment is interrupted, the OTN equipment can also transmit signals by using the standby route, and the smooth transmission of the signals is ensured.

For other implementation manners of implementing dual-route uplink by using an 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 effect may be obtained, which is not described herein again.

4. OTN system hard channel characteristics

In the prior art, the OLT device uses a soft channel for communication. That is, a plurality of user devices share the same router on the OLT device side through the ONU. The OLT equipment encapsulates data sent to the OLT equipment by the user equipment through the ONU into data packets, and sends the data packets to a router on the OLT equipment side through optical fibers, wherein the data packets from the OLT equipment are grouped by an input port of the router on the OLT equipment side and then are decapsulated; after decapsulation is completed, the router checks a value (namely, a destination address) of a field in a header of the data packet, encapsulates the data into the data packet again after acquiring address information, and forwards the data packet to an output port of the router; then the output port of the router searches the target address according to the forwarding table and forwards the data packet to the target address. If there are many data packets and the processing speed is slow, queuing may occur.

When the OLT equipment communicates using the soft channel, this mechanism is repeated (forwarding-queuing-routing-addressing-forwarding) every time it passes through a sink (core) node.

In the aspect of network quality, when a soft channel is used for communication, a data packet needs to be decapsulated, and only one packet can be processed in one unit time, so that queuing is needed when a large number of data packets exist, which causes transmission quality problems such as congestion and delay accumulation.

In the aspect of network security, service information carried by a dedicated line can be easily acquired by packet capturing and intercepting tools, and then data packets can be intercepted and decapsulated by these tools, and then part of information (such as symbols) in the data packets is modified, which causes link failure and finally results in information loss or leakage.

In the communication architecture provided in the embodiment of the present application, the OLT device performs communication using a hard channel.

Hard channel: the current main stream branch road side foundation (i.e. the butt service board) of the OTN device is the ODU0 (the channel capacity is 1.25G), and a user device shares a particle channel of the OTN device connected to the OLT device through the ONU. That is, after the OLT device encapsulates 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, the docking service board of the OTN device sends the data packet to the BRAS device through the particle channel of the OTN device, the whole ODU0(1.25G) channel is used by one user device, and the situation that a plurality of user devices share the same particle does not occur.

The hard channel has the transmission characteristics of 'special use + transparency', wherein the special use means that each particle channel is exclusively shared by each client; transparent means that the OTN device directly transmits the data packet sent by the OLT device, and does not decapsulate the data packet.

In the aspect of network quality, each user equipment shares one particle channel, so that a soft channel repetition mechanism does not exist every time the user equipment passes through one aggregation (core) node, so that data transmission does not exist congestion, and time delay can be guaranteed.

In the aspect of network security, because the OTUk signal is used for transmission in the OTN network transmission process, and the service information carried by the dedicated line needs to be acquired by analyzing the frame first, general enterprises and individuals have fewer wavelength division related devices, and therefore, the information cannot be acquired easily.

Second, the OTN uses time division multiplexing to divide a channel into multiple time slots. For example, a 100G channel of an OTN network has timeslots from ODUflex0 to ODUflex80, and to acquire information of a certain user, it is necessary to precisely locate the information in the timeslot where the user is located, and the OTN device is used to perform decapsulation into an ethernet signal, and then frame, packet, and segment-by-segment decapsulation is performed on the ethernet signal to possibly acquire the signal of the user. Therefore, the security of the hard pipeline service is ensured from the 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 invention 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 invention 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 will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A communication network architecture, the communication network architecture comprising: a first OLT device and an OTN network;

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

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

2. The architecture of claim 1, wherein the first optical module is a bidirectional optical module;

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

3. The communication network architecture of claim 2, wherein the upstream equipment of the first OLT equipment comprises: a first BRAS device and a second BRAS device; wherein the first BRAS device comprises: 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 dual-fiber bidirectional optical module;

a first optical module of the first OLT device is connected with a third optical module of the first BRAS 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 is connected with the fourth optical module of the second BRAS device through the OTN network to form a second uplink routing link of the first OLT device.

4. The communication network architecture of claim 3, further comprising: the second OLT device and the first OLT device 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 optical module;

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

5. The architecture according to claim 4, wherein said fifth optical module and said seventh optical module are both single fiber bidirectional optical modules, and said sixth optical module and said eighth optical module are both dual fiber bidirectional optical modules;

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

6. The architecture according to claim 4, wherein said fifth optical module, said sixth optical module, said seventh optical module, said eighth optical module are all two-fiber bidirectional optical modules;

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

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

7. A communication network architecture according to any of claims 4-6, characterized in that the traffic handled by the first OLT device and the traffic handled by the second OLT device are different.

8. The communication network architecture according to any of claims 4-6,

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.

9. The communication network architecture of claim 8, wherein dual-routing connections are used between OTN devices of a convergence layer in each OTN routing link;

and/or, adopting double-route connection between the OTN devices of the core layer in each OTN routing link.

10. The communication network architecture of claim 2, wherein the upstream device of the first OLT device is a third BRAS device; wherein the third BRAS device comprises: the optical module 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;

a first optical module of the first OLT device is connected with a ninth optical module of the third BRAS device through a third optical fiber to form a first uplink routing link of the first OLT device; the second optical module of the first OLT device is connected with 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.

Images