CN1992731B

CN1992731B - An access multiplexer and its method for realizing multiple digital subscriber line access modes

Info

Publication number: CN1992731B
Application number: CN2005101123137A
Authority: CN
Inventors: 刘彦民; 付赛雄; 蒋锋
Original assignee: Alcatel Lucent Shanghai Bell Co Ltd
Current assignee: Nokia Shanghai Bell Co Ltd
Priority date: 2005-12-29
Filing date: 2005-12-29
Publication date: 2010-04-21
Anticipated expiration: 2025-12-29
Also published as: CN1992731A

Abstract

The invention provides an access multiplexing device and method for realizing multiple data subscriber line access modes in a communication network. The present invention is proposed in order to solve the problem that the prior art cannot meet the special requirements in data subscriber line access such as SHDSL. The method and device according to the present invention are characterized in that they support IMA, EFM and other access methods based on the port at the same time, so that IMA, EFM, M-Pari and Bonding and other access methods can be simultaneously implemented on the same data subscriber line access multiplexing interface board. The input mode meets the special requirements of data subscriber line access, realizes broadband access of narrowband services, and can realize multiple protocols and certain special requirements on the data plane, and has flexible protocol scalability.

Description

Access multiplexer for realizing multiple digital subscriber line access modes and method thereof

Technical Field

The present invention relates to a communication network, and more particularly, to an access multiplexing device and method for implementing multiple digital subscriber line access modes in a communication network (especially, an access network).

Background

Due to the establishment and maturity of the unified standard g.shdsl, the single copper stranded high-speed digital subscriber line (SHDSL) gradually becomes the mainstream of the current symmetric digital subscriber line market. By using the SHDSL transmission technology, telecommunication and network service providers only need to provide a bi-directional symmetric, multi-rate high-speed transmission service of up to 2.3Mbps by using a twisted copper wire under the existing telephone network architecture.

In the prior art, there are two schemes that can be used for single-wire-to-high-speed digital subscriber line access, where:

the digital subscriber line access multiplexer interface board is a general access method, and can be applicable to Asymmetric Digital Subscriber Line (ADSL), very high speed digital subscriber line (VDSL), single line pair high speed digital subscriber line (SHDSL) and Local Area Network (LAN). However, special requirements of SHDSL technologies, such as support of port-based ATM Inverse Multiplexing (IMA) and first mile Ethernet (EFM) modes, cannot be realized, that is, access modes such as IMA and EFM cannot be simultaneously realized on the same board.

In addition, the device and method for bearing broadband service by using narrowband resource is a method for realizing broadband access by using narrowband resource, which can not realize the requirement of large-capacity user access due to the inherent limitation of narrowband.

Therefore, a new access scheme is needed to enable SHDSL to support multiple working modes such as EFM and IMA simultaneously.

Disclosure of Invention

The present invention is to overcome the above-mentioned disadvantages in the prior art, and provides a technical solution for implementing multiple different dsl access modes on the same dsl access multiplexer interface board. Specifically, the invention realizes the support of IMA, EFM, M-Pair and Bonding modes based on ports at board level, namely EFM, IMA, M-Pair and Bonding modes and the like can work on the same line interface board, and GE (gigabit Ethernet) ports are adopted as uplink interfaces, thereby really realizing broadband access and non-blocking forwarding, realizing various protocols and certain special requirements on a data plane, and having flexible protocol expandability. Thereby solving the aforementioned problems in the prior art.

According to one aspect of the present invention, there is provided a port-based method for digital subscriber line access in a communication network, comprising the steps of: receiving input data from a data user link; converting the input data into encapsulated data in IMA or EFM format according to user requirements; and converting the packaged data into output data with a uniform format.

According to another aspect of the present invention, there is also provided a port-based access multiplexing device for single-pair digital subscriber line access in a communication network, comprising: receiving means for receiving input data from a data user link; the first conversion device is used for converting the input data into encapsulated data in IMA or EFM format according to the user requirement; and the second conversion device is used for converting the encapsulated data into output data with a uniform format.

Compared with the prior art, the invention adopts the scheme, realizes the simultaneous existence of access modes such as IMA, EFM and the like on the same line interface board, meets the special requirements of SHDSL access, and realizes the broadband access of narrowband services.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a multi-mode single-wire pair data subscriber line access scheme in accordance with one embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a technical solution for implementing multiple access modes on the same single-wire-to-high-speed data subscriber line access multiplexing interface board according to an embodiment of the present invention;

fig. 3 is a flowchart of a method for implementing multiple dsl access modes in the same dsl access multiplexer according to an embodiment of the present invention;

fig. 4 is a block diagram of an access multiplexing device for implementing multiple data subscriber line access modes according to an embodiment of the present invention.

Wherein the same reference numerals indicate the same or similar features or functions.

Detailed Description

The following describes in detail how to implement simultaneous support of work modes such as EFM and IMA based on ports on a single-line pair high-speed subscriber present access multiplexing interface board, with reference to the accompanying drawings, and it should be understood that the present invention is not limited to the specific embodiments described above, and is also applicable to other types of data subscriber line access multiplexing devices.

Two access modes, namely M-Pair and binding, are introduced firstly: M-Pair is a physical layer concept, in the physical layer, a plurality of pairs (preferably 1 to 4 pairs) of physical links are aggregated to form a logical link, so that a longer physical link transmission distance can be obtained under the condition of ensuring a certain transmission rate; and when the transmission distance is constant, the transmission rate can be optimized. Unlike M-Pair, the Bonding approach is not implemented at the physical layer, but rather is implemented to aggregate logical links, which will be described in detail later. At present, the two access modes are very important functions in the SHDSL access,

fig. 1 is a block diagram of an access scheme in the present invention. The basic idea of the invention is to support simultaneous working modes like IMA and EFM based on ports on a data user line interface board. According to the user's requirement, the port is set into a mode (such as IMA) and corresponding to the user, then the port will work in IMA mode, until the user needs to change the mode, the port will be reset at the local side.

The management layer in fig. 1 is used to implement configuration management on a service plane; the data layer in fig. 1 is the main path of data, and at the same time, in-band management (i.e., management within the data layer) can be realized.

Fig. 2 is a schematic diagram of a technical solution for implementing multiple access modes on the same single-wire-to-high-speed data subscriber line access multiplexing interface board according to an embodiment of the present invention. Each SHDSL module corresponds to one SHDSL physical link and implements a corresponding physical layer function. The EFM module carries out EFM format conversion on the data of the SHDSL module. And the IMA module performs IMA format conversion on the data of the SHDSL module.

The binding function is divided into two cases: EFM and IMA, namely EFM Bonding and IMA Bonding.

Under the EFM condition, data passes through an EFM Bonding module, which performs EFM data format conversion on a SHDSL physical link, and the SHDSL physical link is converted into a logical link in the EFM format after passing through the data format conversion in the EFM format. Then, the EFM Bonding module implements Bonding function on multiple pairs (preferably 1 to 4 pairs) of the SHDSL logical links in EFM format, and aggregates the multiple pairs (preferably 1 to 4 pairs) of the SHDSL logical links in EFM format into one logical connection in EFM format;

in case of IMA, data is passed through an IMA binding module, which first performs IMA data format conversion on a SHDSL physical link, and the SHDSL physical link is converted into a logical link in an IMA format after passing through the data format conversion in the IMA format. Then, the IMA Bonding module implements Bonding function on multiple pairs (preferably 1 to 4 pairs) of SHDSL logical links in IMA format, and aggregates the multiple pairs (preferably 1 to 4 pairs) of SHDSL logical links in IMA format into one path of logical connection in IMA format.

Likewise, the M-Pair function is divided into two cases: EFM and IMA, i.e., EFMM-Pair and IMA M-Pair.

In the case of EFM, data will pass through an EFM-Pair module, which performs an M-Pair function on multiple pairs (preferably 1 to 4 pairs) of physical links at the physical layer, and aggregates them into one logical link, and then, performs EFM format data format conversion on the logical link;

in IMA case, the data will go through an IMA M-Pair module that performs M-Pair (preferably 1 to 4 pairs) of physical links at the physical layer, aggregates them into one logical link, and then performs IMA format data format conversion on the logical link.

After the above operations, six logical links, i.e., IMA, EFM, IMABonding, EFMBonding, IMA M-Pair, and EFM-Pair, exist simultaneously, and are respectively used for carrying data in two formats, i.e., IMA and EFM.

Converting EFM format data (carried by EFM, EFM Bonding, EFMM-Pair) into Ethernet unified format by an EFM interface module; the IMA format data (carried by IMA, IMA binding, IMA M-Pair) is converted to a unified format (e.g., ethernet format) by an IMA interface module. Preferably, a plurality of ethernet protocols, such as VLAN (virtual local area network), can again be implemented by the protocol station.

Fig. 3 is a flowchart of a method for implementing multiple access modes in the same dsl access multiplexing device and simultaneously supporting EFM, IMA, and other modes to operate on a single board according to an embodiment of the present invention.

In step S301, input data from a data user link is received.

In step S302, the port corresponding to the user is set to work in a certain mode according to the user requirement, and then, after the data arrives, the access device performs corresponding format conversion on the received data according to the preset working mode of the port, converts the input data into encapsulated data in an IMA or EFM format, and transfers the encapsulated data to an upper layer for further processing;

preferably, in step S302, after receiving data from the user end, if the access port corresponding to the user end is set to a binding working mode according to the needs of the user, the access device performs corresponding EMF or IMA data format conversion on data on each of a plurality of physical links belonging to the user, and then aggregates the EMF or IMA data on the plurality of format-converted logical links into data on a logical link of a corresponding format, and transfers the data to an upper layer for further processing;

preferably, in step S302, after receiving data from the user side, if the port corresponding to the user side is set to the M-Pair operating mode according to the requirement of the user, the access device aggregates data on a plurality of physical links belonging to the user into data on a logical link with a corresponding format, and further converts the data on the logical link with the corresponding format into an EFM or IMA format, and forwards the data to the upper layer for further processing.

After step 302, the data belongs to two formats, EFM and IMA, and then, in step 303, the access device converts the data in the EFM and IMA formats into output data in a unified format through the EFM interface function and the IMA interface function, respectively.

The receiving device 401 is configured to receive input data from a user side, set a port corresponding to the user to operate in a certain mode according to the user's requirement, and reset the port at the office side until the user needs to change the operating mode, so that the port operates in the mode required by the user;

the first conversion means 402 are adapted to convert the input data into data in a corresponding format (IMA or EFM) and to forward said data in a corresponding format to the second conversion means;

the second conversion device 403 is configured to convert the data processed by the first conversion device 402 into output data in a unified format, in an embodiment of the present invention, the unified format is an Ethernet format;

preferably, the access multiplexing device further includes:

an aggregation device 404, configured to aggregate data on multiple physical links into data on one logical link, where the data on the multiple physical links are transferred from the access device 401 to the aggregation device; and is

The first conversion device 402 is further configured to convert the data aggregated by the aggregation device 404 into a corresponding format, that is, when the working mode of the port corresponding to the user is EFM-Pair or IMA

M-Pair respectively corresponding to EFM and IMA formats, so that the first conversion device 402 converts the aggregated data into EFM or IMA format;

the aggregation device 404 is further configured to aggregate multiple paths of data in IMA or EFM format into one path of aggregated data in a corresponding format, where the multiple paths of data in IMA or EFM format are subjected to format conversion by the first conversion device 402; and is

The second conversion device 403 is further configured to convert the aggregated data in the corresponding format into output data in a unified format, such as ethernet format.

The technical solutions of the present invention have been described above with reference to specific embodiments. It is to be understood that the present invention is not limited to a particular system, device, and protocol, and that various changes or modifications may be made by one skilled in the art without departing from the scope of the appended claims.

Claims

1. A method for realizing multiple access modes in a data subscriber line access multiplexing device of a communication network comprises the following steps:

a) receiving input data from a data user link;

b) converting the input data into encapsulated data in IMA or EFM format according to user requirements;

c) and converting the packaged data into output data with a uniform format.

2. The method of claim 1, further comprising the steps of:

aggregating data from a plurality of physical links into one aggregated logical link data;

wherein the step b) is as follows:

and converting the aggregated logical link data into encapsulated data in IMA or EFM format.

3. The method according to claim 1 or 2, wherein step b) further comprises:

aggregating a plurality of paths of IMA or EFM format data into a path of aggregated IMA or EFM format data;

wherein, the step c) is to convert the aggregated IMA or EFM format data into output data with a uniform format.

4. The method according to claim 1 or 2, characterized in that:

the data user link is a high speed data user link.

5. The method of claim 4, wherein:

the unified format is an ethernet protocol.

6. A data subscriber line access multiplexing device for implementing multiple access modes in a communication network comprises,

receiving means for receiving input data from a data user link;

the first conversion device is used for converting the input data into encapsulated data in IMA or EFM format according to the user requirement;

and the second conversion device is used for converting the encapsulated data into output data with a uniform format.

7. The access multiplexing device of claim 6, further comprising:

aggregation means for aggregating data from a plurality of physical links into one aggregated logical link data;

wherein,

the first conversion device is further configured to convert the aggregated logical link data into encapsulated data in IMA or EFM format.

8. The access multiplexing device according to claim 6 or 7, further comprising:

wherein, the second conversion device is also used for converting the aggregated IMA or EFM format data into output data in a unified format.

9. The access multiplexing device of claim 6 or 7,

the data user link is a high speed data user link.

10. The access multiplexing device of claim 6 or 7,

the unified format is an ethernet protocol.