CN101137247B - Access system and method for PDH branch service - Google Patents
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Abstract
The invention discloses an access system of plesiochronous digital hierarchy tributary service, comprising: tributary service adapter plates, many types of tributary interface boards which are connected by a same bus and the tributary service adapter plate, wherein, the tributary interface board comprises: an analog interface circuit unit, an interface processing unit and a mapping unit. Through separating the interface processing and the service adaptation, different tributary interface boards can use same tributary service adapter plates, the invention reduces workload of product design, shortens product development cycle; and when the system back board needs to update, the tributary interface can be loaded with only changing the service adapter plate; the tributary interface boards can be applied to different series product, investment of traders can be protected in maximum.
Description
Technical Field
The present invention relates to the field of communication technology, and in particular, to the field of access technology of PDH (plesiochronous Digital Hierarchy) tributary services in SDH (Synchronous Digital Hierarchy) and SONET (Synchronous Optical Network) Optical transmission communication equipment.
Background
In current SDH and SONET optical transmission equipment, a backplane service bus mainly used is in the form of STM-N (Synchronous Transport Module, N is 1, 4, 16, 64, etc.). When the access processing of PDH (plesiochronous digital hierarchy) branch service is carried out by using the method, the access processing not only comprises branch service interface and service processing, but also carries out STM-N framing processing of SDH (synchronous digital hierarchy) on the service, and then transmits the service to other functional units of the equipment through a backboard, and transmits the service to a circuit board of the equipment for transmission according to the configuration of a network manager.
By adopting an STM-N form, a branch service interface, service processing and STM-N framing of the STM-N interface are completed on one board card. In the aspect of telecommunication engineering, the PDH branch interface type at a user end may need to be flexibly changed according to different types of services, and when the PDH branch interface type is changed, an entire board card must be replaced together, thereby causing great fund waste.
Disclosure of Invention
The invention provides an access system and an access method of a quasi-synchronous digital series branch service, which are used for solving the problem that in the prior art, when the interface type of a PDH branch changes, the whole board card must be replaced together.
The purpose of the invention is realized by the following technical scheme:
the invention provides an access system of quasi-synchronous digital series branch service, comprising: a tributary service adaptation board, a plurality of types of tributary interface boards, which are respectively connected with the tributary service adaptation board through the same bus,
in the quasi-synchronous digital system branch service receiving direction, the branch interface board is used for processing the service of the received service signal and then sending the processed signal to the branch service adaptation board connected with the branch service adaptation board through the bus; the branch service adaptation board is used for carrying out frame encapsulation on the received signals and sending the encapsulated signals;
in the branch service sending direction of the plesiochronous data system, the branch service adapter board is used for removing frame encapsulation from the received service signal and sending the removed signal to a branch interface board connected with the branch service adapter board through the bus; the branch line interface board is used for carrying out service processing on the received signals.
The bus type between the branch line interface board and the branch line service adaptation board is a fourth-level virtual container bus or a fourth-level management unit bus. The plurality of types of branch line interface boards at least comprise the following two branch line interface boards:
an E1 branch interface board, an E2 branch interface board, an E3 branch interface board, and an E4 branch interface board; or, the plurality of types of tributary interface boards at least include the following two types of tributary interface boards:
t1 tributary interface board, T2 tributary interface board, T3 tributary interface board, T4 tributary interface board.
Further, the tributary interface board specifically includes:
the analog interface circuit unit is used for carrying out power matching on service signals accessed from the branch interface board in the branch service receiving direction of the plesiochronous digital system; in the quasi-synchronous data system branch service sending direction, the analog interface circuit unit is used for performing power matching on a service signal obtained from the interface processing unit;
the interface processing unit is used for performing clock, data recovery, code pattern conversion and decoding on the signals matched by the analog interface circuit unit in the branch service receiving direction of the plesiochronous digital system; in the branch service sending direction of the quasi-synchronous data system, the interface processing unit is used for carrying out code pattern conversion, clock insertion and coding on the branch signals decoded by the mapping unit;
the mapping unit is used for mapping the branch signals processed by the interface processing unit to fourth-level virtual container data or fourth-level management unit data in the branch service receiving direction of the plesiochronous digital system; in the branch service sending direction of the plesiochronous data system, the mapping unit is configured to solve a corresponding branch signal from the fourth-level virtual container or the fourth-level management unit.
The invention also provides an access method of the quasi-synchronous digital series branch service, which comprises the following steps:
setting a branch service adaptation board and various types of branch interface boards in synchronous digital hierarchy/synchronous optical network transmission equipment, wherein the various types of branch interface boards are respectively connected with the branch service adaptation board through the same bus;
in the receiving direction of the branch service of the quasi-synchronous digital system, after the branch interface board processes the received service signal, the processed signal is sent to a branch service adaptation board connected with the branch service adaptation board through the bus; the branch service adaptation board performs frame encapsulation on the received signals and sends the encapsulated signals; and/or the presence of a gas in the gas,
in the branch service sending direction of the plesiochronous data system, the branch service adapter board removes frame encapsulation from the received service data and sends the removed signal to a branch interface board through the bus; and the branch line interface board performs service processing on the received signals.
Further, in the sub-synchronous digital system branch service receiving direction, the step of the branch interface board performing service processing on the received service signal specifically includes:
performing power matching on the service signals accessed from the branch line interface board, and sending the matched signals;
performing clock, data recovery, code pattern conversion and decoding on the matched signals;
and carrying out signal mapping and sending the mapped signal, the clock and the frame header information to the branch service adaptation board.
Further, in the service sending direction of the branch of the plesiochronous data system, the step of the branch interface board performing service processing on the received signal specifically includes:
resolving a corresponding branch signal according to the received service signal;
carrying out code pattern conversion, clock insertion and encoding on the branch signals;
and performing power matching on the branch signals.
Further, the plurality of types of tributary interface boards at least include the following two types of tributary interface boards:
an E1 branch interface board, an E2 branch interface board, an E3 branch interface board, and an E4 branch interface board; or, the plurality of types of tributary interface boards at least include the following two types of tributary interface boards:
t1 tributary interface board, T2 tributary interface board, T3 tributary interface board, T4 tributary interface board.
The invention has the following beneficial effects:
because the interface processing and the service adaptation are separated, different branch interface boards can use the same branch service adaptation board, the workload of product design is reduced, and the product development cycle is shortened; the interface processing and service adaptation functions are separated, the interface board functions are simplified, and the workload of production test can be reduced; different interface boards can use the same service adaptation board, so that the inventory risk can be reduced;
the simplified service adaptation board structure is convenient for developing more value-added functions, such as branch service direct connection and the like;
the smooth upgrade is convenient, and when the system back plate needs to be upgraded, the branch interface can be borne only by replacing the service adapter plate; meanwhile, the branch line interface board is convenient to be applied to different series of products, and the investment of operators is protected to the maximum extent;
because PDH service is accessed, the capacity is low, the data rate is not high, and even if VC-4/AU-4 buses with lower speed are adopted between the branch line interface board and the branch line service adapter board, the problem of overhigh number of connection lines of a back board interface is not worried.
Drawings
FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structural relationship between the system and other boards according to the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an exemplary structural relationship between the system and other panels according to an embodiment of the present invention. .
Detailed Description
The system and method according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The core idea of the system and the method of the embodiment of the invention mainly comprises the following steps: processing and separating a PDH tributary interface and tributary services into a tributary interface board and a tributary service adaptation board in SDH/SONET transmission equipment; the same branch service adaptation board card can be compatible for butt joint with different types of branch interface boards. SDH belongs to the ITU-T (international telecommunications union) family of standards, whereas SONET belongs to the north american family of standards, both of which are approximate in their substance and in their main specifications, and are also common in backplane bus design technology. The invention relates to the field of optical transmission communication equipment of two standards of SDH and SONET, and in the following description, the application of SDH equipment is taken as an environmental description for simplifying language description. It will be appreciated by those skilled in the art that the systems and methods described in the practice of the present invention are equally applicable to SONET transmission equipment.
First, the system according to the embodiment of the present invention will be described in detail.
As shown in fig. 1, the system according to the embodiment of the present invention specifically includes:
the present invention relates to a tributary service adapter board, and a plurality of tributary interface boards, wherein the plurality of tributary interface boards are respectively connected with the tributary service adapter board through the same bus, and the type of the bus can be a VC-4 (fourth level virtual container) bus or an AU-4 (fourth level management unit) bus in the specific implementation process of the embodiment of the present invention. Wherein, the branch line interface board specifically includes: the device comprises an analog interface circuit unit, an interface processing unit and a mapping unit.
The following is a detailed description of the specific processing procedure of the system according to the embodiment of the present invention.
As shown in fig. 2, fig. 2 is a schematic diagram of a structural relationship between the system and other boards according to the embodiment of the present invention,
in PDH receiving direction, service signal is accessed through a branch interface board, enters an interface processing unit after power matching is carried out through an analog interface circuit unit, the interface processing unit finishes clock and data recovery, code pattern conversion and decoding processing, then the signal enters a mapping unit, the mapping unit finishes the mapping from the branch signal to VC-4\ AU-4 data, and the mapped signal is sent to a branch service adaptation board through a VC-4\ AU-4 bus; performing STM-N framing encapsulation processing on the SDH signal mapped by the mapping unit by branch service adaptation, such as: the VC-4 signal is encapsulated into STM-4. Finally, the service signal is sent to the cross unit in a unified service bus form through the backboard to complete service cross connection, and then sent to other board cards for transmission.
In the PDH transmit direction, the reverse of the receive direction is done. Specifically, the service signal sent from the optical circuit board is sent to the tributary service adaptation board through the cross board, and after the tributary service adaptation board completes service data stripping STM-4 encapsulation, the VC-4/AU4 data, clock and frame header information are handed over to the tributary interface board for processing. The mapping unit of each type of branch interface board resolves the corresponding branch signal, the interface processing unit completes the code pattern conversion, clock insertion and coding processing, and finally the analog interface circuit unit performs power matching to form standard interface type data such as E1/E2/E3/E4 and the like, and sends the standard interface type data to the user side.
In a specific implementation process of the embodiment of the present invention, the analog interface circuit unit is usually a transformer bank, the interface processing unit may be an interface processing chip (LIU), and the mapping unit may be a mapping chip.
The tributary interface boards can be divided into different types according to the types of interface processing chips (LIU) and mapping chips, including but not limited to E1 tributary interface board, E2 tributary interface board, E3 tributary interface board, E4 tributary interface board, etc.; for SONET, including but not limited to T1 tributary interface boards, T2 tributary interface boards, T3 tributary interface boards, T4 tributary interface boards, etc. Meanwhile, although the mapping chips of various types are different in design, the system side of the branch interface board adopts a unified VC-4/AU-4 bus; the tributary service adapter board is also butted with the tributary interface board by adopting a unified VC-4/AU-4 bus, and the system side of the adapter board is butted with the back board by adopting an STM-N bus to transmit service signals to other functional units, such as a cross unit. Therefore, one tributary service adaptation board can be compatible with various types of tributary interface boards.
The system of the present invention is illustrated in the following description with reference to the accompanying drawings.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating an exemplary structural relationship between the system and other boards according to the embodiment of the present invention; an SDH device needs to process PDH E1, E2, and E3 services, the PDH services are accessed from an interface board, the services are crossed through a cross board, and the PDH services are transmitted to an optical circuit board of an STM-16 to complete downstream transmission to a network.
Specifically, in terms of PDH service interface processing, three service interface boards, E1, E2, and E3, and a tributary service adapter board need to be designed. The three types of branch line interface boards are respectively connected through a bus and a branch line adaptation board, and the bus between the branch line interface board and the branch line service adaptation board can be a VC-4 bus of 77.76Mhz in the specific implementation process of the embodiment of the invention;
in the PDH service receiving direction, the data of the E1/E3/E3 user interface is subjected to power matching through the analog interface circuit unit, and the matched signal is subjected to clock and data recovery through the interface processing unit and is subjected to code pattern conversion and decoding processing. Then the signal enters a mapping chip to map the branch signal to VC-4 data, and the mapped VC-4/AU-4 data signal, the clock and the frame header information are sent to a branch service adaptation board through a back board.
And the PDH service completes framing and packaging processing from the VC-4 signal to the STM-4 signal in the branch service adaptation board through branch service adaptation, the STM-4 signal after framing and packaging is sent to the cross board through the back board, and finally sent to the STM-16 optical circuit board for transmission through optical fibers after cross connection of the cross board.
In PDH service sending direction, the service data sent from STM-16 optical circuit board is sent to the tributary service adaptation board through the cross board, after the service data is stripped and STM-4 is packaged, the VC-4 data, clock and frame header information are handed over to the tributary interface board for processing. Each type of branch interface board resolves corresponding branch signals from the fourth-level virtual container or the fourth-level management unit, completes code type conversion, clock insertion and coding processing, forms standard interface type data such as E1/E3/E4 after power matching, and sends the standard interface type data to a user side through an analog interface circuit.
The interface between the branch line interface board and the branch line adaptation board is a unified VC-4 bus, and the interface between the branch line adaptation board and the cross board is a unified STM-4 bus, so that the branch line interface board can be directly butted with the service adaptation board through the unified VC-4 bus interface no matter what type the branch line interface board is, no matter what services are processed by the E1, E2 or E3.
The following is a description of the method of the embodiments of the present invention.
The method of the embodiment of the invention specifically comprises the following steps:
setting a branch service adaptation board and various types of branch interface boards on SDH transmission equipment, wherein the various types of branch interface boards are respectively connected with the branch service adaptation board through the same bus; the branch interface board is provided with an analog interface circuit unit, an interface processing unit and a mapping unit.
In the receiving direction of the branch service of the quasi-synchronous digital system, after the branch interface board processes the received service signal, the processed signal is sent to a branch service adaptation board connected with the branch service adaptation board through the bus; the tributary service adaptation board performs frame encapsulation on the received signals, sends the frame-encapsulated signals to the cross board for service cross, and sends the frame-encapsulated signals to other board cards (for example, STM-16 optical circuit boards) for service processing or transmission.
In the branch service sending direction of the plesiochronous data system, service data sent from other board cards (such as an STM-16 optical circuit board) are sent to a branch service adapter board through a cross board, the branch service adapter board removes frame encapsulation from the received service data, and sends the removed data, clock and frame header information to a branch interface board through the bus; and the branch line interface board performs service processing on the received data, the clock and the frame header information.
The specific implementation process of the method according to the embodiment of the present invention has been described in detail in the foregoing system, and will not be described herein again. The embodiments of the present invention are described herein in the context of SDH equipment applications, but those skilled in the art will appreciate that the systems and methods described in the present embodiments are equally applicable to SONET transport equipment.
In summary, the system and method according to the embodiments of the present invention, through the modular structure processing, can achieve the following technical effects:
interface processing and service adaptation are separated, different interface boards can use the same service adaptation board, the workload of product design is reduced, and the product development period is shortened. For example, the interface board of E1 and the interface board of E3 can both use a unified service adaptation board for service adaptation. Thus, because interface processing and service adaptation are separated, the functions of the interface boards of E1 and E3 are simplified, and the design workload is reduced.
The interface processing and service adaptation functions are separated, the interface board functions are simplified, and the workload of production test can be reduced; and different interface boards can use the same service adaptation board, so that the inventory risk can be reduced.
The simplified service adaptation board structure is convenient for developing more value-added functions, such as branch service direct connection and the like.
The smooth upgrade is convenient, and when the system back plate needs to be upgraded, the branch interface can be borne only by replacing the service adapter plate; meanwhile, the branch line interface board is convenient to be applied to different series of products, and investment of operators is protected to the maximum extent.
Because PDH service is accessed, the capacity is low, the data rate is not high, and even if VC-4/AU-4 buses with lower speed are adopted between the branch line interface board and the branch line service adapter board, the problem of overhigh number of connection lines of a back board interface is not worried.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An access system for plesiochronous digital hierarchy tributary services, comprising: a tributary service adaptation board, a plurality of types of tributary interface boards, which are respectively connected with the tributary service adaptation board through the same bus,
in the quasi-synchronous digital system branch service receiving direction, the branch interface board is used for processing the service of the received service signal and then sending the processed signal to the branch service adaptation board connected with the branch service adaptation board through the bus; the branch service adaptation board is used for carrying out frame encapsulation on the received signals and sending the encapsulated signals;
in the branch service sending direction of the plesiochronous data system, the branch service adapter board is used for removing frame encapsulation from the received service signal and sending the removed signal to a branch interface board connected with the branch service adapter board through the bus; the branch line interface board is used for carrying out service processing on the received signals.
2. The system according to claim 1, wherein the bus type between the tributary interface board and the tributary traffic adaptation board is a fourth level virtual container bus or a fourth level management unit bus.
3. The system according to claim 2, wherein the tributary interface board specifically comprises:
the analog interface circuit unit is used for carrying out power matching on service signals accessed from the branch interface board in the branch service receiving direction of the plesiochronous digital system; in the quasi-synchronous data system branch service sending direction, the analog interface circuit unit is used for performing power matching on a service signal obtained from the interface processing unit;
the interface processing unit is used for performing clock, data recovery, code pattern conversion and decoding on the signals matched by the analog interface circuit unit in the branch service receiving direction of the plesiochronous digital system; in the branch service sending direction of the quasi-synchronous data system, the interface processing unit is used for carrying out code pattern conversion, clock insertion and coding on the branch signals decoded by the mapping unit;
the mapping unit is used for mapping the branch signals processed by the interface processing unit to fourth-level virtual container data or fourth-level management unit data in the branch service receiving direction of the plesiochronous digital system; in the branch service sending direction of the plesiochronous data system, the mapping unit is configured to solve a corresponding branch signal from the fourth-level virtual container or the fourth-level management unit.
4. The system according to claim 1, wherein the plurality of types of tributary interface boards comprises at least two of the following tributary interface boards:
an E1 branch interface board, an E2 branch interface board, an E3 branch interface board, and an E4 branch interface board; or,
the plurality of types of branch line interface boards at least comprise the following two branch line interface boards:
t1 tributary interface board, T2 tributary interface board, T3 tributary interface board, T4 tributary interface board.
5. A method for accessing quasi-synchronous digital hierarchy branch service is characterized by comprising the following steps:
setting a branch service adaptation board and various types of branch interface boards in synchronous digital hierarchy/synchronous optical network transmission equipment, wherein the various types of branch interface boards are respectively connected with the branch service adaptation board through the same bus;
in the receiving direction of the branch service of the quasi-synchronous digital system, after the branch interface board processes the received service signal, the processed signal is sent to a branch service adaptation board connected with the branch service adaptation board through the bus; the branch service adaptation board performs frame encapsulation on the received signals and sends the encapsulated signals; and/or the presence of a gas in the gas,
in the branch service sending direction of the plesiochronous data system, the branch service adapter board removes frame encapsulation from the received service data and sends the removed signal to a branch interface board through the bus; and the branch line interface board performs service processing on the received signals.
6. The method according to claim 5, wherein the bus type between the tributary interface board and the tributary traffic adaptation board is a fourth level virtual container bus or a fourth level management unit bus.
7. The method according to claim 6, wherein in the quasi-synchronous digital system tributary service receiving direction, the step of the tributary interface board performing service processing on the received service signal specifically includes:
performing power matching on the service signals accessed from the branch line interface board, and sending the matched signals;
performing clock, data recovery, code pattern conversion and decoding on the matched signals;
and carrying out signal mapping and sending the mapped signal, the clock and the frame header information to the branch service adaptation board.
8. The method according to claim 7, wherein in the direction of sending tributary traffic in the plesiochronous data system, the step of the tributary interface board performing traffic processing on the received signal specifically includes:
resolving a corresponding branch signal according to the received service signal;
carrying out code pattern conversion, clock insertion and encoding on the branch signals;
and performing power matching on the branch signals.
9. The method according to claim 5, wherein the plurality of types of tributary interface boards comprises at least two of the following tributary interface boards:
an E1 branch interface board, an E2 branch interface board, an E3 branch interface board, and an E4 branch interface board; or, the plurality of types of tributary interface boards at least include the following two types of tributary interface boards:
t1 tributary interface board, T2 tributary interface board, T3 tributary interface board, T4 tributary interface board.
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| CN102739335B (en) * | 2012-06-14 | 2014-12-10 | 北京润光泰力科技发展有限公司 | Method and device for designing back plate of synchronous digital hierarchy (SDH) optical fiber transmission system |
| CN102902646B (en) * | 2012-09-17 | 2015-12-09 | 大唐移动通信设备有限公司 | The loading method of board communication means and board, FPGA and system |
| CN104468218B (en) * | 2014-12-12 | 2019-02-19 | 国家电网公司 | PCM device based on transmission device |
| CN109510716B (en) * | 2017-09-14 | 2022-04-29 | 中兴通讯股份有限公司 | Signal processing device and method |
| CN109039753B (en) * | 2018-08-20 | 2021-10-15 | 郑州云海信息技术有限公司 | Communication method and communication equipment based on Ethernet |
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| CN1617469A (en) * | 2003-11-15 | 2005-05-18 | 华为技术有限公司 | Method for realizing different speed PDH service intercommunication in synchrounic optical network |
| CN1968065A (en) * | 2006-06-23 | 2007-05-23 | 华为技术有限公司 | Microwave communication service transmission method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1617469A (en) * | 2003-11-15 | 2005-05-18 | 华为技术有限公司 | Method for realizing different speed PDH service intercommunication in synchrounic optical network |
| CN1968065A (en) * | 2006-06-23 | 2007-05-23 | 华为技术有限公司 | Microwave communication service transmission method and system |
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