CN107995540B - Passive optical network architecture based on bandwidth multistage convergence - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
- H04L12/2869—Operational details of access network equipments
- H04L12/287—Remote access server, e.g. BRAS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
- H04L12/2869—Operational details of access network equipments
- H04L12/2878—Access multiplexer, e.g. DSLAM
- H04L12/2892—Access multiplexer, e.g. DSLAM characterised by the access multiplexer architecture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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Abstract
The invention discloses a passive optical network architecture based on bandwidth multistage convergence, which comprises a plurality of optical network units ONU supporting one or more than one channel, a multilayer optical line terminal OLT supporting multiple channels, a plurality of optical distribution networks ODN for providing optical transmission channels for the optical line terminal OLT and the optical network units ONU, and a plurality of broadband remote access servers BRAS for connecting an access network and a broadband backbone network.
Description
Technical Field
The invention relates to a passive optical network architecture, in particular to a passive optical network architecture based on bandwidth multistage convergence.
Background
With the rapid development of the internet, the demand of users on the access network bandwidth is continuously increased, the passive optical network is an important technical means of the current user access network bandwidth, in the existing passive optical network architecture, an optical line terminal OLT is connected with an optical distribution network ODN, the optical distribution network is connected with a plurality of optical network units ONU of user sides, the passive optical network deployment adopts a flat architecture, the optical line terminal OLT has no grade difference and is a non-difference direct access broadband remote access server BRAS device, the existing passive optical network architecture is convenient for the access of the OLT device, a large number of board cards need to be configured from the OLT to the BRAS section, the investment is huge, and meanwhile, in order to realize the optical cable dual-route protection of the OLT device, a large amount of fiber core resources with long distance need to be consumed; because the OLTs accessed by the existing passive optical network architecture have no grade difference, the classified deployment is difficult to carry out according to different service conditions, corresponding supporting facilities are required to be invested for all the OLTs, and huge investment burden is caused to operators.
Disclosure of Invention
Aiming at the technical problems, the invention provides a passive optical network architecture based on bandwidth multistage convergence, which can realize differentiated batch deployment of network quality and network management strategies, reduce the cost of an operator for deploying an Optical Line Terminal (OLT) in a large scale and improve the network security.
In order to achieve the above object, the present invention provides a passive optical network architecture based on bandwidth multi-level convergence, including: a plurality of optical network units ONU supporting one or more channels, a multi-layer optical line termination OLT supporting multiple channels, a plurality of optical distribution networks ODN for providing optical transmission channels for the optical line termination OLT and the optical network units ONU, and a plurality of broadband remote access servers BRAS for connecting an access network and a broadband backbone network, wherein:
the optical line terminal OLT is used for sending Ethernet data to the optical network unit ONU in a broadcasting mode, distributing bandwidth for the optical distribution network ODN, and controlling the starting time and the sending window size of the data sent by the optical network unit ONU;
the optical network unit ONU is user end equipment in an optical network and is used for acquiring bandwidth distributed by the optical line terminal OLT, packaging data on a channel into frames and transmitting the frames to the target optical line terminal OLT;
the optical network units ONU are divided into a plurality of groups, one or more than one optical network unit ONU is one group, and one group of optical network units ONU is connected with one optical distribution network ODN.
The optical line termination OLT comprises a layer 1 OLT, a layer 2 OLT … …, a layer n-1 OLT and a layer n OLT, each layer of optical line termination OLT is provided with one or more optical line termination OLTs, wherein:
the optical line terminal OLT of the layer 1 is used for accessing the bandwidth service of a user in a specific scene, and one end of the optical line terminal OLT of the layer 1 is connected with the optical distribution network ODN in a one-to-one corresponding mode to carry out first-level convergence of the bandwidth;
the optical line terminal OLT of layer 1 is divided into several groups, one or more layer 1 optical line terminal OLT is a group, the other end of optical line terminal OLT of layer 1 and one end of optical line terminal OLT of layer 2 are connected in one-to-one correspondence mode to make bandwidth two-stage convergence
……
By the way of analogy, the method can be used,
the plurality of optical line terminals OLT of the n-1 layer are divided into a plurality of groups, one or more than one optical line terminal OLT of the n-1 layer is a group, one end of each group of optical line terminal OLT of the n-1 layer is connected with the optical line terminal OLT of the n layer in a one-to-one corresponding mode, and the bandwidth is converged at the n-1 level;
the other end of the nth layer optical line terminal OLT is connected with the broadband remote access server BRAS, and one nth layer optical line terminal is connected with at least one broadband remote access server BRAS for carrying out bandwidth n-level convergence.
Preferably, an optical line terminal OLT of a passive optical network architecture based on bandwidth multi-level convergence has 2 layers, which are a sinking access OLT and a convergence OLT, respectively, and by dividing the level of the OLT device, an operator can deploy differentiated network construction and protection strategies, where:
the sinking access type OLT is provided with a plurality of bandwidth services for accessing a specific scene in a network region unit, one end of the sinking access type OLT is connected with the optical distribution network ODN in a one-to-one corresponding mode, and the sinking access type OLT only accesses the bandwidth services of a certain specific scene user in the network region unit, such as a certain large cell, and the access mode is convenient for improving the network management efficiency;
the method comprises the following steps that a plurality of sinking access type OLTs are divided into 1-2 groups, one or more than one sinking access type OLT is/are one group, and the other end of each group of sinking access type OLTs is connected with one end of a convergence type OLT in a one-to-one corresponding mode;
the convergent OLT has 1-2 bandwidth services for accessing all users in the network region unit, including the bandwidth service accessed by the sinking access type OLT in the network region unit, and the other end of one convergent OLT is connected with at least one broadband remote access server BRAS.
The number of the broadband remote access servers BRAS connected with the OLT is reduced through two-stage convergence of user bandwidth services, so that a large number of board cards required by the configuration of the broadband remote access servers BRAS are reduced.
Preferably, the optical distribution network ODN performs primary convergence on the bandwidth service of the specific scene user in the network region unit in the sinking access OLT; the broadband service accessed by the plurality of sinking access type OLTs is subjected to secondary convergence in the convergence type OLT, so that the fiber core consumption from the sinking access type OLTs to the BRAS in the original network structure is greatly reduced; the bandwidth services of the convergent OLTs are subjected to three-level convergence at a broadband remote access server BRAS, a large number of board cards required to be configured from the OLTs to the BRAS in an original network structure are reduced, and an optical cable access distance element is lower than the distance of the sinking OLT directly accessing the BRAS in the original network structure, so that the probability of network terminals of the sinking OLT caused by fiber core interruption is reduced.
Preferably, the convergent OLT configures a 10GE gigabit ethernet interface, and is connected to the broadband remote access server through a dual physical route having two route interfaces physically, so that the convergent OLT provides a network architecture with stable access for an operator and is not affected by fiber core interruption.
Preferably, the convergent OLT is arranged in a self-owned machine room of an operator by adopting a high-capacity standard rack server device, so that the safety of network transmission is ensured.
Preferably, the sinking access type OLT is connected to the convergence type OLT in a multi-GE gigabit ethernet transmission link manner, and is configured to improve a bandwidth accessed by a user.
Preferably, the sinking access type OLT adopts miniaturized box type OLT equipment and is arranged in a non-machine room environment, local small-range user bandwidth services can be conveniently accessed, and investment requirements on machine room resources of operators are greatly reduced by deploying the sinking access type OLT in an outdoor cabinet.
Preferably, the sinking access type OLT can be configured with the sinking type OLTs individually according to the coverage area type, access different user types, and set different devices, thereby improving the flexibility of network construction and maintenance.
Advantageous effects
The invention realizes the multi-stage convergence of the bandwidth service by layering the OLT equipment of the optical line terminal, and reduces the number of the optical line terminals accessed to the broadband remote access server BRAS, thereby reducing the number of board cards required by the configuration of the broadband remote access server BRAS and the fiber core consumption required from the OLT to the BRAS; by adopting large-capacity rack equipment for the convergent OLT, the safety of network transmission is improved, and small-sized box-type equipment is adopted for the sinking OLT, so that the investment on machine room resources is reduced, and the cost of operators is reduced.
Drawings
Fig. 1 is a schematic diagram of multi-level convergence of bandwidth services;
fig. 2 is a schematic diagram of a passive optical network architecture based on bandwidth three-level convergence;
fig. 3 is a three-level convergence traffic flow diagram of the bandwidth traffic.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are further described with reference to the accompanying drawings:
as shown in fig. 1, the passive optical network architecture may perform multi-level convergence, where first all bandwidth services perform bandwidth primary convergence on a layer 1 OLT through the ODN network, bandwidth secondary convergence … … is performed on a plurality of bandwidth services of the first layer OLT on a layer 2 OLT, and so on, and an nth layer OLT service performs bandwidth n + 1-level convergence on the broadband remote access server, and by means of the multi-level convergence of the bandwidth services, the number of OLTs connected to the broadband remote access server BRAS is gradually reduced, so that the number of board cards required for configuring the BRAS in the original network architecture and the consumption of long-distance fiber core resources are reduced.
The passive optical network coverage area shown in fig. 2 includes: a plurality of optical network units ONU supporting one or more channels, a 2-layer optical line terminal OLT supporting multiple channels, a sinking access OLT and a convergence OLT, respectively, and a plurality of optical distribution networks ODN for providing optical transmission channels for the optical line terminal OLT and the optical network units ONU, wherein: the method comprises the following steps that a plurality of ONUs are divided into a plurality of groups, one or more than one ONU is a group, one group of ONUs is connected with an Optical Distribution Network (ODN), each ODN is connected with one end of each sinking access type OLT in a one-to-one corresponding mode, and bandwidth primary convergence is carried out on user bandwidth services of the ONUs; the method comprises the following steps that a plurality of sinking access type OLTs are divided into a plurality of groups, one or more than one sinking access type OLT is/are one group, the other end of each group of sinking access type OLTs is connected with one end of a convergence type OLT in a one-to-one corresponding mode, bandwidth service secondary convergence is carried out on bandwidth service of primary convergence, the sinking access type OLTs adopt small box-type equipment, link binding is carried out through a plurality of GE gigabit Ethernet links, the convergence type OLTs are connected, and the network safety is improved through the connection mode; the other end of the convergent OLT is connected with a Broadband Remote Access Server (BRAS), the bandwidth service of secondary convergence is subjected to three-level convergence, the convergent OLT is deployed in a self-owned machine room of an operator, high-capacity standard rack server equipment is adopted, a 10GE ten-gigabit Ethernet interface is configured, the convergent OLT is connected with the BRAS through a double-physical route with two route interfaces, and the cable access distance of the convergent OLT to the BRAS is far lower than that of the convergent OLT in the original architecture, so that the probability of network interruption caused by fiber core interruption of the convergent OLT is reduced, and the safety and the stability of a network are ensured. By adopting the three-level convergence mode of the bandwidth service, namely ONU-sunken access type OLT-convergence type OLT-BRAS, the two-level convergence of the bandwidth service is achieved, and the number of board cards required for configuring the BRAS in the original network architecture and the consumption of long-distance fiber core resources are reduced.
As shown in fig. 3, the affiliated network region unit has a plurality of specific scenes, the bandwidth service types accessed by each specific scene can be classified into one type, the optical network unit ONU transmits data to the sinking access OLT through the ODN, the sinking access OLT accesses the bandwidth service of a certain specific scene user through the ODN, the plurality of sinking access OLT services are converged to the convergence OLT, the convergence OLT accesses all the bandwidth services in the network region unit, and the convergence OLT accesses all the bandwidth services in the affiliated network region unit to the broadband remote access server BRAS and transmits the bandwidth services to the backbone network. For example, a certain network region unit has a plurality of specific scenes, wherein one specific scene is a large cell, another specific scene is a high-end office building, and other specific scenes are available, wherein, a plurality of users are arranged in a cell, a plurality of users are also arranged in a high-end office building, each user has own bandwidth service requirement, the user of the specific scene accesses an optical network unit ONU which has own bandwidth service requirement into a sinking access type OLT through an optical distribution network ODN, the ODN carries out bandwidth first-stage convergence on the sinking access type OLT, then the bandwidth service of the user is accessed into the sinking access type OLT, the bandwidth secondary convergence is carried out on the convergence type OLT, the bandwidth service is converged on the convergence type OLT, the convergence type OLT accesses all the bandwidth businesses in the network region unit to the broadband remote access server BRAS to carry out the bandwidth tertiary convergence, and at the moment, the user bandwidth service is transmitted to the backbone network through the BRAS.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. A passive optical network architecture based on bandwidth multi-level convergence, comprising: a plurality of optical network units ONU supporting one or more channels, a multi-layer optical line terminal OLT supporting multiple channels, a plurality of optical distribution networks ODN for providing optical transmission channels for the optical line terminal OLT and the optical network units ONU, and a plurality of broadband remote access servers BARS for connecting an access network to a broadband backbone network, wherein:
the optical line terminal OLT is used for sending Ethernet data to the optical network unit ONU in a broadcasting mode, distributing bandwidth for the optical distribution network ODN, and controlling the starting time and the sending window size of the optical network unit ONU for sending the data;
the optical network unit ONU is a user end device in an optical network and is used for acquiring a bandwidth distributed by an optical line terminal OLT, and transmitting data on a channel to a target optical line terminal OLT after being packaged into frames;
the optical network units ONU are divided into a plurality of groups, one or more than one optical network unit ONU is one group, and one group of optical network units ONU is connected with an optical distribution network ODN;
the optical line terminal OLT comprises n (n is more than or equal to 2 and n is an integer) layers of OLT, each layer of optical line terminal OLT is provided with one or more optical line terminal OLT, wherein:
the layer 1 optical line terminal OLT is used for accessing the bandwidth service of a user in a specific scene, and one end of the layer 1 optical line terminal OLT is connected with the optical distribution network ODN in a one-to-one corresponding mode to perform primary bandwidth convergence;
the plurality of optical line terminals OLT of the 1 st layer are divided into a plurality of groups, one or more than one optical line terminal OLT of the 1 st layer is a group, and the other end of each group of the optical line terminal OLT of the 1 st layer is connected with one end of the optical line terminal OLT of the 2 nd layer in a one-to-one corresponding mode to carry out bandwidth secondary convergence;
by the way of analogy, the method can be used,
the plurality of optical line terminals OLT of the n-1 layer are divided into a plurality of groups, one or more than one optical line terminal OLT of the n-1 layer is a group, one end of each group of the optical line terminals OLT of the n-1 layer is connected with the optical line terminal OLT of the n layer in a one-to-one corresponding mode, and the bandwidth is converged at the n-1 level;
the other end of the nth layer optical line terminal OLT is connected with a broadband remote access server BRAS, and one nth layer optical line terminal is connected with at least one broadband remote access server BRAS to carry out bandwidth n-level convergence.
2. A passive optical network architecture based on bandwidth multi-stage convergence according to claim 1, wherein the optical line termination OLT has 2 layers, which are a sinking access OLT and a convergence OLT, respectively, wherein:
the sinking access type OLT is provided with a plurality of OLT which are used for accessing the bandwidth service of a specific scene in a network region unit, and one end of the sinking access type OLT is connected with the plurality of optical distribution networks ODN in a one-to-one corresponding mode;
the sinking access type OLTs are divided into 1-2 groups, one or more than one sinking access type OLTs form one group, and the other end of each group of sinking access type OLTs is connected with one end of the convergence type OLT in a one-to-one corresponding mode;
the convergent OLT is provided with 1-2 bandwidth services for accessing all users in a network region unit, including the bandwidth services accessed by the sinking access OLT in the network region unit, and the other end of one convergent OLT is connected with at least one broadband remote access server BRAS.
3. The passive optical network architecture based on bandwidth multi-stage convergence of claim 2, wherein the Optical Distribution Network (ODN) performs one-stage convergence on the bandwidth service of the specific scene user at the sinking access type OLT; performing secondary convergence on the bandwidth services accessed by the sinking access type OLTs at the convergence type OLTs; and the bandwidth services of the plurality of convergent OLTs are subjected to three-level convergence at a Broadband Remote Access Server (BRAS).
4. The passive optical network architecture based on bandwidth multistage convergence according to claim 2, wherein the convergence OLT configures a 10GE gigabit ethernet interface, and is connected to a broadband remote access server BRAS through a dual physical route having two route interfaces physically.
5. A passive optical network architecture based on bandwidth multistage convergence according to claim 2, wherein the converged OLT employs standard rack server equipment, and the standard rack server equipment is disposed in an own machine room of an operator.
6. A passive optical network architecture based on bandwidth multistage convergence according to claim 2, wherein the sinking access OLT is connected to the convergence OLT in a manner of bundling multiple GE gigabit ethernet transmission links for bandwidth increase.
7. The passive optical network architecture based on bandwidth multistage convergence, according to claim 2, wherein the sinking access type employs a box OLT device for accessing local scene-specific user bandwidth services, and the box OLT device is disposed in a non-machine room environment.
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| CN113938770B (en) * | 2020-06-29 | 2023-03-24 | 华为技术有限公司 | Bandwidth scheduling method and system based on multi-stage passive optical network |
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