CN101924960B - Service transport system, equipment and method - Google Patents
Service transport system, equipment and method Download PDFInfo
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Abstract
The embodiment of the invention provides service transport system, equipment and method. The service transport system comprises the service transport equipment and a packet switching core, wherein the service transport equipment is used for receiving an SDH (Synchronous Digital Hierarchy) line signal from access layer equipment of a TDM (Time Division Multiplexing) switching network, converting the SDH line signal into TDM service, separating the TDM service into EOS (End of Signaling) service and non-EOS service, then converting the EOS service into packet service corresponding to the packet switching core and sending the packet service to the packet switching core; and the packet switching core is used for receiving the packet service and sending the packet service to convergence layer equipment of a packet switching network. The embodiment of the invention realizes the communication of the pocket service between the packet switching network and the TDM switching network without modifying the access layer equipment, thereby saving the cost.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a method, an apparatus, and a system for transmitting a service in a packet-switched network and a Time Division Multiplexing (TDM) switched network.
Background
With the development of communication services, users have higher and higher bandwidth requirements on networks. Traditional connection-oriented TDM switching equipment, such as Synchronous Digital Hierarchy (SDH) and Multi-Service Transmission Platform (MSTP), is difficult to meet the needs of operators, and Packet Transport Network (PTN) equipment is produced for this purpose. In the PTN device, traffic is transmitted in packet form, and interworking with the original transmission device is difficult. At present, two network modes exist, one is a completely newly built PTN network, and the other is that the PTN network coexists with an SDH network and an MSTP network. In the latter network model, the PTN network size is relatively small, and the SDH and MSTP networks are relatively large. In TDM-switching networks, traffic is generally carried by Ethernet Over SDH (EOS) in a manner that SDH carries Ethernet packets.
When the PTN network is still small in scale, it is necessary to provide a technology capable of directly loading the ethernet service loaded in the SDH/MSTP network onto the PTN network after conversion, that is, implementing the interworking of the service between the TDM switching network and the packet switching network, and protecting the existing investment of the operator in the TDM switching network.
For operators, the dual-plane equipment for packet switching and TDM switching can gradually switch the traffic in the TDM switching network into the packet switching network. Because the number of the convergence layer equipment is small, the network structure is clear, and the cost sensitivity is relatively low, the evolution speed of the convergence layer equipment to the packet switching and TDM switching biplane equipment is higher. To achieve end-to-end traffic transmission, access layer equipment has evolved into packet-switched and TDM-switched dual-plane equipment. However, in general, the number of access layer devices is huge, the network structure is complicated, and the access layer focuses more on the network construction cost, and if the access layer devices are completely modified into packet-switched and TDM-switched dual-plane devices, the process is a long process.
Disclosure of Invention
Embodiments of the present invention provide a method, an apparatus, and a system for service transmission, which implement interworking between a packet-switched network and a TDM-switched network for packet services.
An embodiment of the present invention provides a service transmission system, including: a service transmission device and a packet switching core; the service transmission equipment is used for receiving synchronous digital Series (SDH) line signals from access layer equipment of a Time Division Multiplexing (TDM) switching network, converting the SDH line signals into TDM services, separating the TDM services into SDH Ethernet data packet (EOS) services and non-EOS services, converting the EOS services into packet services corresponding to the packet switching core, and sending the packet services to the packet switching core; and the packet switching core is used for receiving the packet service and sending the packet service to convergence layer equipment of a packet switching network.
An embodiment of the present invention further provides a service transmission system, including: the system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; the service transmission device is used for receiving SDH line signals of a synchronous digital hierarchy from an access layer device of a TDM switching network, converting the SDH line signals into TDM services, and sending the TDM services to the TDM switching core; the TDM switch core is used for separating the TDM service into an SDH Ethernet data packet EOS service and a non-EOS service, and then sending the EOS service to the service transmission equipment; the service transmission device is further configured to convert the EOS service from the TDM switch core into a packet service corresponding to the packet switch core, and send the packet service to the packet switch core; and the packet switching core is used for receiving the packet service and sending the packet service to convergence layer equipment of a packet switching network.
An embodiment of the present invention further provides a service transmission device, where the service transmission device is located in a service transmission system, the service transmission system further includes a packet switching core, and the service transmission device includes: the interface module is used for converting Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of the Time Division Multiplexing (TDM) switching network into TDM services; the service separation/combination module is used for separating the TDM service from the interface module into an SDH Ethernet data packet EOS service and a non-EOS service; and the service conversion module is used for converting the EOS service from the service separation/combination module into a packet service corresponding to the packet switching core and sending the packet service to the packet switching core communicated with the packet switching network convergence layer equipment.
An embodiment of the present invention further provides a service transmission device, where the service transmission device is located in a service transmission system, the service transmission system further includes a packet switching core and a time division multiplexing TDM switching core, and the service transmission device includes: the interface module is used for converting Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of the TDM switching network into TDM services to be sent to the TDM switching core; and the service conversion module is used for receiving an Ethernet over coax (EOS) service from the TDM switching core, converting the EOS service into a packet service corresponding to the packet switching core, and sending the packet service to the packet switching core communicated with a packet switching network convergence layer device, wherein the EOS service is obtained by separating the received TDM service through the TDM switching core.
The embodiment of the invention also provides a service transmission method, which is applied to a service transmission system, wherein the service transmission system comprises service transmission equipment and a packet switching core; the service transmission method comprises the following steps: the service transmission equipment receives SDH line signals from access layer equipment of a time division multiplexing TDM switching network, converts the SDH line signals into TDM services, separates the TDM services into SDH Ethernet data packet EOS services and non-EOS services, converts the EOS services into packet services corresponding to the packet switching core, and sends the packet services to the packet switching core; and the packet switching core receives the packet service and sends the packet service to convergence layer equipment of a packet switching network.
The embodiment of the invention also provides a service transmission method, which is applied to a service transmission system, wherein the service transmission system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; the service transmission method comprises the following steps: the service transmission equipment receives Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of a TDM switching network, converts the SDH line signals into TDM services and sends the TDM services to a TDM switching core; the TDM switching core separates the TDM service into an SDH Ethernet data packet EOS service and a non-EOS service, and then sends the EOS service to the service transmission equipment; the service transmission equipment converts the EOS service from the TDM switching core into a packet service corresponding to the packet switching core and sends the packet service to the packet switching core; and the packet switching core receives the packet service and sends the packet service to convergence layer equipment of a packet switching network.
The embodiment of the invention can realize the intercommunication of the packet service between the packet switching network and the TDM switching network. By means of the traffic transmission device, method and system according to the embodiments of the present invention, EOS traffic and non-EOS traffic in SDH line signals from a TDM-switched network access layer device can be separated so as to convert the EOS traffic into packet traffic corresponding to a packet-switched core, and then the packet traffic is sent to a packet-switched network via the packet-switched core communicating with a packet-switched network convergence layer device, or vice versa. Thus, the service transmission system including the service transmission equipment of the embodiment of the invention can be positioned at the convergence layer, the equipment of the access layer does not need to be modified, the cost is saved, and the existing investment of the TDM switching network is protected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic block diagram illustrating a traffic transmission system according to one embodiment of the present invention;
fig. 2 is a schematic block diagram illustrating a traffic transmission system according to another embodiment of the present invention;
fig. 3 is a schematic block diagram illustrating a traffic transmission system according to another embodiment of the present invention;
fig. 4 is a schematic block diagram illustrating a traffic transmission system according to another embodiment of the present invention;
fig. 5 is a schematic block diagram illustrating a traffic transmission system according to another embodiment of the present invention;
fig. 6 is a schematic block diagram illustrating a traffic transmission system according to another embodiment of the present invention;
fig. 7 is a schematic flow chart diagram illustrating a traffic transmission method of a traffic transmission system according to one embodiment of the present invention;
fig. 8 is a schematic flowchart illustrating a service transmission method of a service transmission system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Traffic of a TDM system such as SDH, MSTP (hereinafter referred to as "TDM traffic") mainly includes EOS traffic and other types of TDM traffic. The invention mainly solves the intercommunication between the EOS service and the packet switching core. Hereinafter, TDM traffic of other types (e.g., voice traffic, etc.) than EOS traffic will be referred to as "non-EOS traffic".
Fig. 1 is a schematic block diagram illustrating a traffic transmission system 1000 according to an embodiment of the present invention. The service transmission system 1000 includes a service transmission apparatus 100 and a packet switching core 200.
The service transmission device 100 receives an SDH line signal from an access layer device of the TDM switching network, converts the SDH line signal into a TDM service, separates the TDM service into an EOS service and a non-EOS service, converts the separated EOS service into a packet service corresponding to the packet switching core 200, and sends the packet service to the packet switching core 200.
The packet-switched core 200 receives packet traffic and sends the packet traffic to convergence layer devices of the packet-switched network. The packet-switched core 200 may perform a scheduling process for packet traffic. For example, the packet switching core 200 may be a service switching core of a PTN device, and may adopt a frame switching manner or a fixed fragment switching manner depending on a packet switching plane design architecture.
In embodiments of the present invention, the packet traffic may include ethernet traffic or other packet traffic.
It should be noted that the packet-switched core 200 may be implemented by any existing corresponding device or module, and is not intended to limit the scope of the embodiments of the present invention.
The signal processing from the convergence layer to the access layer is exactly the reverse of the above procedure. The service transmission system 1000 of the embodiment of the present invention may be configured in the convergence layer without separating the EOS service in the access layer. Therefore, the embodiment of the invention does not need to modify a huge number of access layer devices, saves the cost and protects the existing investment of the TDM switching network.
Fig. 2 is a schematic block diagram illustrating a traffic transmission system 1000' according to one embodiment of the present invention. Like or similar reference numerals in fig. 1 and 2 denote like or corresponding elements. The service transmission system 1000 ' includes a service transmission apparatus 100 ', a packet switching core 200 ', and a TDM switching core 300. In this embodiment, the packet switched core 200' is of the ethernet type.
As shown in fig. 2, the packet switching core 200' may communicate with convergence layer devices of a packet-switched network and the TDM switching core 300 may communicate with convergence layer devices of a TDM-switched network. For example, the packet switching core 200' may be a service switching core of a PTN device, and may adopt a frame switching manner or a fixed fragment switching manner depending on a packet switching plane design architecture. The TDM switching core 300 can be a time slot cross core in TDM switching equipment, and realizes various levels of cross connection such as VC4/VC3/VC 12.
It should be noted that the packet switch core 200 and the TDM switch core 300 may employ any existing corresponding devices or modules, which do not limit the scope of the embodiments of the present invention.
The service transmission apparatus 100' may include an interface module 110, a service separation/combination module 120, and a service conversion module 130.
The interface module 110 receives SDH line signals from access layer equipment of the TDM-switching network. The interface module 110 then converts the SDH line signal into TDM traffic. In the other direction, the interface module 110 can convert TDM traffic to SDH line signals for transmission to the outside (e.g., access layer equipment of a TDM switching network). For example, the interface module may implement SDH interface Framer (Framer) functions, i.e., SDH frame framing, deframing functions. Here, the TDM traffic (or, in other words, SDH line signals) includes EOS traffic and non-EOS traffic. The interface rate of interface module 110 may be any level rate of SDH.
The traffic separation/combination module 120 separates the TDM traffic from the interface module 110 into EOS traffic and non-EOS traffic, or synthesizes the EOS traffic and the non-EOS traffic into TDM traffic in the other direction. For example, the traffic splitting/combining module 120 may be a small-capacity TDM cross module that splits EOS traffic and non-EOS traffic in a configured manner. The capacity of the traffic separation/combination module 120 may be smaller than the capacity of the TDM switch core 300, for example, 1/5 or 1/10 of the capacity of the TDM switch core 300.
The traffic conversion module 130 converts the EOS traffic into packet traffic corresponding to the packet switched core 200' or converts the packet traffic into EOS traffic. In the case where the packet-switched core 200 'is of an ethernet type, the traffic conversion module 130 converts the EOS traffic into ethernet traffic corresponding to the packet-switched core 200'. The traffic conversion module 130 receives the EOS traffic separated by the traffic separation/combination module 120, converts the EOS traffic from the traffic separation/combination module 120 into ethernet traffic corresponding to the ethernet-type packet switching core 200 ', or converts the ethernet traffic from the packet switching core 200' into EOS traffic in the other direction to transmit to the traffic separation/combination module 120.
According to an embodiment of the present invention, the traffic splitting/merging module 120 may send the split non-EOS traffic to the TDM switching core 300, so that the TDM switching core 300 performs scheduling processing on the non-EOS traffic and sends the non-EOS traffic to the convergence layer device of the TDM network.
On the other hand, the traffic separation/combination module 120 may receive non-EOS traffic from the TDM switching core 300 and EOS traffic from the traffic conversion module 120. The traffic splitting/merging module 120 then synthesizes the received non-EOS traffic and EOS traffic into TDM traffic to be sent to the interface module 110. Then, the interface module 110 converts the TDM traffic from the traffic separation/combination module 120 into an SDH line signal and sends out to be sent to an access layer device of a TDM switching network (e.g., MSTP network or SDH network).
The service transmission device 1000 ' and the service transmission device 100 ' according to the embodiment of the present invention can separate an EOS service from a non-EOS service in an SDH line signal received from a TDM-switched network access layer device or the like, so as to convert the EOS service into a packet service (ethernet service) corresponding to the packet switching core 200 ', and then send the ethernet service to the packet-switched network via the packet switching core communicating with the packet-switched network convergence layer device, or vice versa. Thus, the service transmission system 1000 'including the service transmission device 100' according to the embodiment of the present invention may be located in the convergence layer, which implements the interworking between the packet switched network and the TDM switched network for packet services such as ethernet services, and does not need to modify the access layer device, thereby saving the cost and protecting the existing investment of the TDM switched network.
Fig. 3 is a schematic block diagram illustrating a traffic transmission system 1000 "according to another embodiment of the present invention. Like or similar reference numerals in fig. 2 and 3 denote like or corresponding elements. The traffic transmission system 1000 "includes a traffic transmission device 100", a packet-switched core 200 ", and a TDM-switched core 300. In this embodiment, the packet-switched core 200 "is of the packet type, i.e. incoming and outgoing is packet traffic.
The service transmission system 1000 "includes all components of the service transmission system 1000 ', and further, since the packet-switched core 200" is of a packet type, the service conversion module 130' needs to convert the EOS service into a packet service corresponding to the packet-switched core 200 ". Therefore, on the basis of fig. 2, a module for converting ethernet traffic and packet traffic needs to be added. As shown in fig. 3, the traffic conversion module 130' of the traffic transmission device 100 ″ includes an EOS conversion module 150 and a packet-switched adaptation module 140.
The EOS conversion module 150 implements substantially the same function as the traffic conversion module 130 of fig. 2, i.e., converts EOS traffic to ethernet traffic, or converts ethernet traffic to EOS traffic in the other direction.
The packet switch adaptation module 140 is configured to further convert the ethernet traffic generated by the EOS conversion module 150 into packet traffic corresponding to the packet switch core 200 ″ to be transmitted to the packet switch core 200 ″. In the other direction, the packet switch adaptation module 140 converts packet traffic from the packet switch core 200 ″ to ethernet traffic and sends it to the EOS conversion module 150. In other words, the packet switching adaptation module 140 is used to adapt with the packet switching core, and this adaptation includes implementing functions of traffic management, traffic scheduling, and the like. The ethernet service is converted into a packet service suitable for the packet switching core 200 ″ of the device by the packet switching adaptation module 140, and then sent to the packet switching core 200 ″ to implement packet switching.
Depending on the type of the packet switched core 200 ", the packet switched adaptation module 140 needs to send the traffic to the packet switched core 200" in a frame manner or to the packet switched core 200 "in a slice manner.
The functions of other modules of the service transmission apparatus 100 ″ are substantially the same as those of corresponding parts in the service transmission apparatus 100', and are not described again.
The service transmission system 1000 "including the service transmission device 100" of the embodiment of the present invention may be located in a convergence layer, which implements interworking of packet services such as ethernet services between a packet-switched network and a TDM-switched network, without modifying access layer devices, saving costs, and protecting existing investment of the TDM-switched network.
In addition, the service transmission systems 1000, 1000' and 1000 ″ according to the embodiments of the present invention do not require the TDM switch core to separate/combine the EOS service and the non-EOS service, so that the cross capacity of the TDM switch core can be saved, and the system is suitable for a system with a smaller TDM switch core capacity.
It should be noted that each module in the service transmission device in fig. 1-3 may be implemented on a single board, or may be implemented on separate boards according to system requirements. These implementations do not limit the scope of the embodiments of the invention.
In addition, the functions of the packet switching adaptation module 140 of the service transmission device 100 ″ of fig. 3 may also be incorporated into the packet switching core 200 ″ as needed, so that the packet switching core performs adaptation conversion on the packet service according to the situation of the packet switching network.
Fig. 4 is a schematic block diagram illustrating a traffic transmission system 5000 according to another embodiment of the present invention. In the embodiments of fig. 1-3, EOS traffic and non-EOS traffic are separated/merged by traffic transport equipment, whereas in this embodiment, the EOS traffic and non-EOS traffic can be separated/merged using a TDM switch core.
As shown in fig. 4, the traffic transmission system 5000 includes a traffic transmission apparatus 500, a packet-switched core 600, and a TDM-switched core 700. The service transmission device 500 receives an SDH line signal from an access layer device of the TDM switching network, converts the SDH line signal into a TDM service, and then sends the TDM service to the TDM switching core 700.
The TDM switching core 700 separates the TDM traffic received from the traffic transmission apparatus 500 into EOS traffic and non-EOS traffic, and then sends the EOS traffic back to the traffic transmission apparatus 500. Then, the traffic transmission apparatus 500 converts the EOS traffic from the TDM switch core 700 into packet traffic corresponding to the packet switch core 600 and transmits the packet traffic to the packet switch core 600.
The packet-switched core 600 receives packet traffic and sends the packet traffic to convergence layer devices of the packet-switched network. The packet-switched core 600 may perform scheduling processing for packet traffic. For example, the packet switching core 600 may be a service switching core of a PTN device, and may adopt a frame switching manner or a fixed fragment switching manner depending on a packet switching plane design architecture.
It should be noted that the packet switch core 600 and the TDM switch core 700 may employ any existing corresponding devices or modules, which do not limit the scope of the embodiments of the present invention.
The signal processing from the convergence layer to the access layer is exactly the reverse of the above procedure. The service transmission system 5000 of the embodiment of the present invention may be configured in the convergence layer without separating the EOS service in the access layer. Therefore, the embodiment of the invention does not need to modify a huge number of access layer devices, saves the cost and protects the existing investment of the TDM switching network.
Fig. 5 is a schematic block diagram illustrating a traffic transmission system 5000' according to one embodiment of the present invention. Like or similar reference numerals in fig. 4 and 5 denote like or corresponding elements. The traffic transmission system 5000 ' includes a traffic transmission apparatus 500 ', a packet-switched core 600 ', and a TDM-switched core 700. In this embodiment, the packet switched core 600' is of the ethernet type.
As shown in fig. 5, the packet switch core 600' may communicate with convergence layer devices of a packet-switched network and the TDM switch core 700 may communicate with convergence layer devices of a TDM-switched network. For example, the packet switching core 600' may be a service switching core of a PTN device, and may adopt a frame switching manner or a fixed fragment switching manner depending on a packet switching plane design architecture. The TDM switch core 700 may be a time slot cross core in a TDM device, and realizes various levels of cross connection such as VC4/VC3/VC 12.
It should be noted that the packet switch core 600' and the TDM switch core 700 may employ any existing corresponding devices or modules, which do not limit the scope of the embodiments of the present invention.
The service transmission apparatus 500' may include an interface module 510, a service separation/combination module 520, and a service conversion module 530.
The interface module 510 is substantially the same as the interface module 110 in fig. 2, and is configured to receive an SDH line signal from an access layer device of a TDM switching network and convert the SDH line signal into TDM traffic. In the other direction, the interface module 510 converts the TDM traffic to SDH line signals for transmission to the outside (e.g., access layer equipment of the TDM switching network). For example, the interface module may implement SDH interface Framer (Framer) functions, i.e., SDH frame framing, deframing functions. Here, the TDM traffic (or, in other words, SDH line signals) includes EOS traffic and non-EOS traffic. The interface rate of interface module 510 may be any level rate of SDH.
The interface module 510 feeds the TDM traffic directly into the TDM switch core 700. Separation of EOS traffic from non-EOS traffic may be implemented in the TDM switch core 700. The separated non-EOS service can be directly sent to the convergence layer equipment of the TDM switching network. The separated EOS traffic is sent back to the traffic transmission device 500 ', specifically, to the traffic conversion module 530 of the traffic transmission device 500'.
The traffic conversion module 530 is substantially the same as the traffic conversion module 130 in fig. 2, and is used for converting EOS traffic into ethernet traffic or converting ethernet traffic into EOS traffic. That is, the traffic conversion module 530 receives EOS traffic (e.g., from the TDM switch core 700) separated from the TDM traffic, and converts it into ethernet traffic corresponding to the ethernet-type packet-switched core 600'.
On the other hand, the traffic conversion module may convert the ethernet traffic into EOS traffic to be output to the outside of the traffic transmission device 500', such as the TDM switching core 700. In this case, the TDM traffic is generated by the TDM switching core 700 merging the EOS traffic and the non-EOS traffic (e.g., from the TDM-switching network convergence layer equipment) and sent back to the interface module 510 of the traffic transmission device 500'. The interface module 510 then converts the TDM traffic into SDH line signals and sends out, e.g., into access layer equipment of a TDM switching network (e.g., MSTP network, SDH network).
The service transmission system 5000 'including the service transmission device 500' of the embodiment of the present invention may be located at the convergence layer, which implements the interworking of packet services such as ethernet services between a packet-switched network and a TDM-switched network, without modifying access layer devices, saving costs, and protecting the existing investment of the TDM-switched network.
Fig. 6 is a schematic block diagram illustrating a traffic transmission system 5000 ″ according to another embodiment of the present invention. Like or similar reference numerals in fig. 5 and 6 denote like or corresponding elements. The traffic transmission system 5000 ″ includes a traffic transmission apparatus 500, a packet-switched core 600 ", and a TDM-switched core 700. In this embodiment, the packet-switched core 600' is of the packet type, i.e., incoming and outgoing is packet traffic.
The traffic transmission system 5000 ″ includes all components of the traffic transmission system 5000 ', and further, since the packet switched core 600 ″ is of a packet type, the traffic conversion module 530' needs to convert the EOS traffic into a packet traffic corresponding to the packet switched core 600 ″. Therefore, on the basis of fig. 5, a module for converting ethernet traffic and packet traffic needs to be added. As shown in fig. 6, the traffic conversion module 530' of the traffic transmission device 500 ″ includes an EOS conversion module 550 and a packet switching adaptation module 540.
The EOS conversion module 550 implements substantially the same function as the traffic conversion module 530 of fig. 5, i.e., converts EOS traffic to ethernet traffic, or converts ethernet traffic to EOS traffic in the other direction.
The packet switch adaptation module 540 is used to further convert the ethernet traffic generated by the EOS conversion module 550 into packet traffic corresponding to the packet switch core 600 "for sending to the packet switch core 600". In the other direction, the packet switch adaptation module 540 converts packet traffic from the packet switch core 600 "into ethernet traffic and sends it to the EOS conversion module 550. In other words, the packet switching adaptation module 540 is used for adapting with the packet switching core, and this adaptation includes implementing functions of traffic management, traffic scheduling, and the like. The ethernet service is converted into a packet service suitable for the packet switch core 600 ″ by the packet switch adaptation module 540, and then sent to the packet switch core 600 ″ to implement packet switching.
Depending on the type of the packet switched core 600 ", the packet switched adaptation module 540 needs to deliver traffic to the packet switched core 600" in a frame manner, or to the packet switched core 600 "in a slice manner.
The functions of other modules of the service transmission apparatus 500 ″ are substantially the same as those of corresponding parts in the service transmission apparatus 500', and are not described again.
The service transmission system 5000 'including the service transmission device 500' according to the embodiment of the present invention may be located in the convergence layer, which implements the interworking of the ethernet service in the packet-switched network and the TDM-switched network, without modifying the access layer device, saving the cost, and protecting the existing investment of the TDM-switched network.
In addition, the service transmission systems 5000, 5000 ', and 5000 ″ and the service transmission devices 500, 500', and 500 ″ according to the embodiments of the present invention fully utilize the service configuration function of the TDM switching core, thereby simplifying the system design, saving the total cost, and being suitable for systems with large TDM switching core capacity.
It should be noted that each module in the service transmission device in fig. 4-6 may be implemented on a single board, or may be implemented on separate boards according to system requirements. These implementations do not limit the scope of the embodiments of the invention.
Fig. 7 is a schematic flow chart diagram illustrating a traffic transmission method 800 according to an embodiment of the present invention. The service transmission method 800 may be applied to the service transmission system 1000, 1000' or 1000 "described above. The traffic transmission method 800 is mainly performed by the traffic transmission device 100, 100' or 100 ".
At S810, the service transmission device of the service transmission system 1000, 1000', or 1000 ″ receives a synchronous digital hierarchy SDH line signal from an access layer device of the TDM-switching network, and converts the SDH line signal into a TDM service. SDH line signal/TDM traffic includes EOS traffic and non-EOS traffic.
At S820, the TDM traffic is separated into EOS traffic and non-EOS traffic by the traffic transmission device.
At S830, the EOS traffic is converted into packet traffic corresponding to the packet switched core by the traffic transmitting device.
In the other direction, packet traffic from the packet switched core is converted to EOS traffic by the traffic transport device at S860.
At S870, non-EOS traffic (e.g., from the TDM switch core 300) and EOS traffic are synthesized by the traffic transport equipment as TDM traffic.
At S880, the TDM traffic is converted to SDH line signals by the traffic transport equipment and sent out, e.g., as shown in fig. 1-3, into access layer equipment of a TDM network (e.g., SDH/MSTP network).
In case of being applied to the traffic transmission system 1000 ″, the traffic transmission method 800 may further include S840 and S850. At S840, the ethernet traffic is further converted into packet traffic corresponding to the packet switched core 200 "and sent to the packet switched core 200" by the packet switched adaptation module 140 of the traffic transmitting device 100 ".
In the other direction, the packet-switched adaptation module 140 converts packet traffic from the packet-switched core 200 ″ into ethernet traffic to be transmitted to the EOS conversion module 150 of the traffic conversion module 130' (see fig. 3) at S850.
It should be noted that the various blocks in fig. 7 do not necessarily have to be performed in the order shown, and the order of execution of some blocks may be modified, omitted, interchanged, or performed in parallel as desired. For example, S810, S820, S830 may be executed in parallel with S860, S870, S880. For example, in case the packet switched core is of the ethernet type, S840 and S850 may be omitted.
The traffic transmission method 800 may correspond to functions performed by various components of the traffic transmission system 1000, 1000', or 1000 ". Corresponding processes can be added, modified and omitted according to the relevant description of the service transmission system. To avoid repetition, further description is omitted.
The service transmission method 800 according to the embodiment of the present invention can realize the intercommunication of the packet service between the packet-switched network and the TDM-switched network without modifying the access layer equipment, thereby saving the cost and protecting the existing investment of the TDM-switched network.
Fig. 8 is a schematic flow chart diagram illustrating a traffic transmission method 900 of a traffic transmission system according to an embodiment of the present invention. The service transmission method 900 may be applied to the service transmission system 5000, 5000', or 5000 "described above. The execution body is shown on the left side of each block of traffic transmission method 900.
At S910, the service transmission device of the service transmission system 5000, 5000', or 5000 ″ receives an SDH line signal from an access layer device of the TDM-switching network, converts the SDH line signal into a TDM service, and sends the converted TDM service to the TDM switching core 700 that communicates with a convergence layer device of the TDM-switching network. TDM traffic includes EOS traffic and non-EOS traffic.
At S920, the TDM switching core 700 separates the TDM traffic into EOS traffic and non-EOS traffic, and then sends the EOS traffic back to the traffic transmission device.
At S930, the traffic transmission apparatus converts the EOS traffic from the TDM switching core 700 into packet traffic corresponding to the packet switching core and transmits the packet traffic to the packet switching core.
In the other direction, the traffic transmission device converts packet traffic from the packet switching core into EOS traffic and transmits to the TDM switching core 700 at S960.
At S970, the TDM switching core 700 synthesizes non-EOS traffic from convergence layer equipment of the TDM switching network and EOS traffic from traffic transmission equipment into TDM traffic.
At S980, the traffic transport device converts the TDM traffic from the TDM switch core 700 into SDH line signals and sends out, for example, into access layer devices of a TDM network (e.g., SDH/MSTP network).
In case of being applied to the traffic transmission system 5000 ″, the traffic transmission method 900 may further include S940 and S950. At S940, the packet-switched adaptation module 540 of the traffic transmission device 500 ″ further converts the ethernet traffic into packet traffic corresponding to the packet-switched core 600 ″ and transmits to the packet-switched core 600 ″.
In the other direction, at S950, the packet-switched adaptation module 540 converts packet traffic from the packet-switched core 600 'into ethernet traffic to be sent to the EOS conversion module 550 of the traffic conversion module 530' (see fig. 6).
It should be noted that the various blocks in fig. 8 do not necessarily have to be performed in the order shown, and the order of execution of some blocks may be modified, omitted, interchanged, or performed in parallel as desired. For example, S910, S920, S930 may be performed in parallel with S960, S970, S980. For example, in case the packet switched core is of the ethernet type, S940 and S950 may be omitted.
The traffic transmission method 900 may correspond to functions performed by various components of the traffic transmission system 5000, 5000', or 5000 ″. Corresponding processes can be added, modified and omitted according to the relevant description of the service transmission system. To avoid repetition, further description is omitted.
The service transmission method 900 of the embodiment of the invention can realize the intercommunication of the packet service between the packet switching network and the TDM switching network without modifying the access layer equipment, thereby saving the cost and protecting the existing investment of the TDM switching network.
According to the embodiment of the invention, the service transmission system comprising the service transmission equipment is positioned on the convergence layer, and the intercommunication of the packet service on the TDM switching plane and the packet switching plane is realized without modifying the access layer equipment. When the access layer network is difficult to be rapidly transformed into a packet switching network, the existing investment of the TDM switching network is protected, and the cost is saved.
The embodiment of the invention can be used for solving the problem that the packet service is intercommunicated between the packet switching network and the TDM switching network when the network is provided with the TDM switching equipment at the access layer and the packet switching/TDM switching biplane equipment or pure packet switching equipment at the convergence layer. From the development trend, the TDM traffic of non-EOS (i.e., "non-EOS traffic" according to the embodiment of the present invention) in the user traffic is less and less, the packet traffic such as ethernet type is more and more, and the amount of EOS traffic in the access layer device will gradually increase. If the EOS traffic is always carried through the TDM traffic, the modification requirement of the access layer device may be increased. The embodiment of the invention enables the services such as EOS services to be communicated on a TDM switching plane and a packet switching plane without modifying access layer equipment, and can protect the existing investment of the TDM switching network.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
While certain embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in these embodiments may be made without departing from the principles of the invention, and such changes are intended to fall within the scope of the invention.
Claims (12)
1. A service transmission system, characterized in that the service transmission system comprises: the system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; wherein,
the service transmission equipment is used for receiving Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of a Time Division Multiplexing (TDM) switching network, converting the SDH line signals into TDM services, separating the TDM services into SDH Ethernet data packet (EOS) services and non-EOS services, converting the EOS services into packet services corresponding to the packet switching core, and sending the packet services to the packet switching core;
the packet switching core is configured to receive the packet service and send the packet service to a convergence layer device of a packet switching network;
the packet switching core is further configured to receive a packet service from a convergence layer device of the packet switching network, and send the packet service to the service transmission device;
the service transmission device is further configured to receive the packet service from the packet switching core, receive a non-EOS service from the TDM switching core, convert the packet service into an EOS service, combine the non-EOS service and the EOS service into a TDM service, and convert the TDM service into an SDH line signal to send the SDH line signal to an access layer device of the TDM switching network.
2. Traffic transmission system according to claim 1,
the service transmission equipment is further configured to send the non-EOS service to the TDM switch core;
the TDM switching core is used for receiving the non-EOS service and sending the non-EOS service to convergence layer equipment of the TDM switching network.
3. The traffic transmission system according to claim 1, wherein the packet-switched core is of an ethernet type, and the traffic transmission device converts the EOS traffic into ethernet traffic corresponding to the packet-switched core.
4. The traffic transmission system of claim 1, wherein the packet-switched core is of a packet type, and the traffic transmission device converts the EOS traffic into packet traffic corresponding to the packet-switched core.
5. A service transmission system, characterized in that the service transmission system comprises: the system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; wherein,
the service transmission equipment is used for receiving Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of the TDM switching network, converting the SDH line signals into TDM services and sending the TDM services to the TDM switching core;
the TDM switch core is used for separating the TDM service into an SDH Ethernet data packet EOS service and a non-EOS service, and then sending the EOS service to the service transmission equipment;
the service transmission device is further configured to convert the EOS service from the TDM switch core into a packet service corresponding to the packet switch core, and send the packet service to the packet switch core;
the packet switching core is configured to receive the packet service and send the packet service to a convergence layer device of a packet switching network;
the packet switching core is further configured to receive a packet service from a convergence layer device of the packet switching network, and send the packet service to the service transmission device;
the service transmission equipment is also used for converting the packet service into an EOS service and sending the EOS service to the TDM switching core;
the TDM switch core is further configured to receive a non-EOS service from convergence layer equipment of the TDM switch network, receive an EOS service from the service transmission equipment, combine the EOS service and the non-EOS service into a TDM service, and send the TDM service to the service transmission equipment;
the service transmission device is further configured to convert the TDM service from the TDM switching core into an SDH line signal to be sent to an access layer device of the TDM switching network.
6. The traffic transmission system of claim 5, wherein the TDM switch core is further configured to send the non-EOS traffic to convergence layer equipment of a TDM switch network.
7. The traffic transmission system according to claim 5, wherein the packet-switched core is of an Ethernet type, and the traffic transmission device converts the EOS traffic into Ethernet traffic corresponding to the packet-switched core.
8. The traffic transmission system of claim 5, wherein the packet-switched core is of a packet type, and the traffic transmission device converts the EOS traffic into packet traffic corresponding to the packet-switched core.
9. A service transmission apparatus, wherein the service transmission apparatus is located in a service transmission system, the service transmission system further includes a packet switching core, and the service transmission apparatus includes:
the interface module is used for converting Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of the Time Division Multiplexing (TDM) switching network into TDM services;
the service separation/combination module is used for separating the TDM service from the interface module into an SDH Ethernet data packet EOS service and a non-EOS service; and
a service conversion module, configured to convert the EOS service from the service separation/combination module into a packet service corresponding to the packet switching core, and send the packet service to the packet switching core in communication with a packet switching network convergence layer device;
the service conversion module is further configured to convert a packet service from the packet switching core into an EOS service, and send the EOS service to the service separation/combination module;
the service separation/combination module is further configured to combine a non-EOS service and an EOS service from the service conversion module into a TDM service, and send the TDM service to the interface module;
the interface module is further configured to convert the TDM service from the service separation/combination module into an SDH line signal, and send the SDH line signal to an access layer device of the TDM switching network.
10. A service transmission device, wherein the service transmission device is located in a service transmission system, the service transmission system further includes a packet switching core and a time division multiplexing TDM switching core, and the service transmission device includes:
the interface module is used for converting Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of the TDM switching network into TDM services to be sent to the TDM switching core;
a service conversion module, configured to receive an EOS service, which is an ethernet over SDH data packet, from the TDM switch core, convert the EOS service into a packet service corresponding to the packet switch core, and send the packet service to the packet switch core in communication with a packet-switched network convergence layer device, where the EOS service is obtained by separating the received TDM service through the TDM switch core;
the service conversion module is further configured to receive a packet service from the packet switching core, convert the packet service into an EOS service, and send the EOS service to the TDM switching core;
the interface module is further configured to convert the TDM service from the TDM switching core into an SDH line signal, and send the SDH line signal to an access layer device of the TDM switching network, where the TDM service is obtained by combining the EOS service and the EOS service from the service conversion module via the TDM switching core.
11. A service transmission method is characterized in that the service transmission method is applied to a service transmission system, and the service transmission system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; the service transmission method comprises the following steps:
the service transmission equipment receives SDH line signals from access layer equipment of a time division multiplexing TDM switching network, converts the SDH line signals into TDM services, separates the TDM services into SDH Ethernet data packet EOS services and non-EOS services, converts the EOS services into packet services corresponding to the packet switching core, and sends the packet services to the packet switching core;
the packet switching core receives the packet service and sends the packet service to convergence layer equipment of a packet switching network;
the packet switching core receives a packet service from convergence layer equipment of the packet switching network and sends the packet service to the service transmission equipment;
the service transmission device receives the packet service from the packet switching core, receives a non-EOS service from the TDM switching core, converts the packet service into an EOS service, synthesizes the non-EOS service and the EOS service into a TDM service, and converts the TDM service into an SDH line signal to be sent to an access layer device of the TDM switching network.
12. A service transmission method is characterized in that the service transmission method is applied to a service transmission system, and the service transmission system comprises service transmission equipment, a packet switching core and a time division multiplexing TDM switching core; the service transmission method comprises the following steps:
the service transmission equipment receives Synchronous Digital Hierarchy (SDH) line signals from access layer equipment of a TDM switching network, converts the SDH line signals into TDM services and sends the TDM services to a TDM switching core;
the TDM switching core separates the TDM service into an SDH Ethernet data packet EOS service and a non-EOS service, and then sends the EOS service to the service transmission equipment;
the service transmission equipment converts the EOS service from the TDM switching core into a packet service corresponding to the packet switching core and sends the packet service to the packet switching core;
the packet switching core receives the packet service and sends the packet service to convergence layer equipment of a packet switching network;
the packet switching core receives a packet service from convergence layer equipment of the packet switching network and sends the packet service to the service transmission equipment;
the service transmission equipment converts the packet service into an EOS service and sends the EOS service to the TDM switching core;
the TDM switching core receives a non-EOS service from convergence layer equipment of the TDM switching network, receives the EOS service from the service transmission equipment, synthesizes the EOS service and the non-EOS service into a TDM service, and then sends the TDM service to the service transmission equipment;
and the service transmission equipment converts the TDM service from the TDM switching core into an SDH line signal to be sent to access layer equipment of the TDM switching network.
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| CN103684957B (en) * | 2012-09-12 | 2018-08-10 | 南京中兴新软件有限责任公司 | Message processing method and device |
| CN103117873B (en) * | 2013-01-11 | 2015-07-08 | 杭州初灵信息技术股份有限公司 | Equipment in-band management achieving method based on media access control (MAC) frame |
| CN105634647B (en) * | 2016-01-07 | 2018-01-02 | 烽火通信科技股份有限公司 | Realize the method and system of PTN device platform forward compatibility MSTP equipment |
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