CN1784079A

CN1784079A - Cut-in multiple connection device for digital user's line and user cut-in device

Info

Publication number: CN1784079A
Application number: CN 200410097787
Authority: CN
Inventors: 吴海军; 曲志军; 熊宇鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-12-04
Filing date: 2004-12-04
Publication date: 2006-06-07
Anticipated expiration: 2024-12-04
Also published as: WO2006058495A1; CN100525508C

Abstract

This invention discloses a digital user line access multiple connector. It contains length fixed package bus and Ethernet switching bus, wherein the multiple connector base on length fixed package bus containing length fixed package interface module, interface board. The multiple connectors based on Ethernet switching bus containing Ethernet switching module, high or low speed Ethernet switching bus and bus connection interface board. Said invention also discloses user access equipment.

Description

Digital Subscriber Line Access Multiplexer and customer access equipment

Technical field

The present invention relates to the access technology of the communications field, relate in particular to a kind of Digital Subscriber Line Access Multiplexer and customer access equipment.

Background technology

Along with being the twisted-pair feeder access technology sizable application in the world of representative with asymmetric number subscribers feeder (ADSL), Digital Subscriber Line Access Multiplexer (DSLAM) product moves to maturity gradually.Different with the selection on the operation mode according to operator at network plan, the DSLAM product comprises ATM(Asynchronous Transfer Mode) DSLAM and two kinds of product form of IP DSLAM, on the equipment and technology scheme, DSLAM equipment is adopting ATM bus or industry ethernet to realize transfer of data between integrated circuit board on the backboard, be converted to ATM respectively or the IP data format is forwarded to the network side interface, wherein ATM DSLAM equipment provides the atm network side interface, and IP DSLAM equipment provides the IP network side interface.At user side, DSLAM equipment provides ADSL, Very-high-speed Digital Subscriber Line (VDSL), single-line high speed digital subscriber line (SHDSL) interface, when ADSL, VDSL interface are provided, last plain old telephone service (POTS) interface that can adopt the speech isolation technics to realize user's analog telephone simultaneously of DSLAM, along with the development of xDSL technology, DSLAM equipment can also provide other DSL interfaces such as ADSL2, ADSL2+, VDSL2.For ATM DSLAM equipment, can also give full play to atm technology and carry multiple services characteristics, multiple business types such as circuit emulation service (CES), frame relay (FR) access are provided simultaneously.

With ADSL is example, and whole connecting system is made up of local side apparatus (DSLAM), ustomer premises access equipment, separator and management system, and the basic configuration of ADSL system as shown in Figure 1.

The difference of SNI in the ADSL system (SNI) type has determined different DSLAM types, i.e. ATM DSLAM and IP DSLAM.Separator can be isolated POTS/ISDN band signal and ADSL band signal, make same twisted-pair feeder on can transmit the professional and ADSL data service of POTS/ISDN simultaneously and make it unaffected mutually.The ADSL administrative unit can be so that (Out-of-Band, OB) (In-Band, IB) mode manages adsl equipment in mode or the band outside being with.

Because the birth of the ADSL technology that is most widely used combines with atm technology, thereby employing atm technology structure DSLAM equipment is the most general and mature technique scheme.As shown in Figure 2, DSLAM equipment is made up of different integrated circuit boards or functional module, generally comprise main control module, supervisory communications module, upstream Interface module, Service Processing Module, adsl interface module, separator module, VDSL interface module, SHDSL interface module and subtending port module etc., wherein main control module, supervisory communications module, upstream Interface module can be physically independent integrated circuit boards, also can be the integrated circuit boards of unification.When adopting the atm technology scheme, adopt the business datum between the ATM bus realization module to transmit in the DSLAM system.

Each interface module in the DSLAM system or integrated circuit board link to each other by the ATM bus that is distributed on the backboard, connect the intercommunication that realizes between each user side interface module and the upstream Interface module by permanent tunnel (PVC) in system.The SM interface type that the upstream Interface module externally provides has determined the type of DSLAM, and when the SNI interface was atm interface, this DSLAM equipment was ATM DSLAM; Also can in the upstream Interface module, realize professional adaptive between ATM and the IP, constitute IP DSLAM equipment.

Subscriber Interface Module SIM comprises xDSL business interfaces such as ADSL, VDSL, SHDSL, for ATMDSLAM equipment, also can provide ATM business interfaces such as CES, FR, and in addition, the ATM cascade module among the DSLAM is also by among the ATM bus connecting system.Can be in the system by increasing the processing of special-purpose Service Processing Module realization to the higher business of device processes performance requirement.

In such DSLAM system, the ATM bus is all professional transmission channels, is the basic bus of system, in addition, in system, can also have some secondary buses, as be used for control messages between carrier module communication bus, be used to test bus that connects by the external testing instrument etc.

DSLAM equipment as shown in Figure 2 has following shortcoming:

(1) the ATM bus bandwidth is generally narrower, common speed grade such as 155M, 622M, the higher ATM bus bandwidth of performance can reach 1.2G, 2.5G speed grade, these bandwidth are shared by whole DSLAM system, the bandwidth of whole DSLAM system is subjected to the restriction of ATM bus bandwidth, performance is lower, and the bandwidth that on average arrives each Subscriber Interface Module SIM is low, is difficult to adapt to the fast development of broadband access demand;

(2) from technical standpoint, though can adopt the ATM switching network to make up jumbo ATM back board system, as shown in Figure 3, in fact, expensive ATM switch network architecture makes such DSLAM system can not obtain practical application.The DSLAM equipment that directly inserts the user must adopt cheap system configuration.

(3) QoS (QOS) tenability deficiency.In atm fabric DSLAM system, adopt ATM PVC to realize inner the connection between upstream Interface and the user interface, need be undertaken controlling by quality of service (QOS) mechanism of ATM based on data traffic and the priority of PVC, and in fact, user's business is embodied directly in the IP operation type, in the ordinary course of things, each user adopts single PVC to connect to insert the DSLAM system, like this can't be in the DSLAM system for PVC in the different QOS that provides of different service types ensure.Certainly, can consider every kind of different PVC of professional employing is inserted, but will cause being multiplied of PVC quantity like this, bring extra complexity to network data configuration and management maintenance.

(4) multicast tenability deficiency.DSLAM system based on the ATM framework generally adopts point-to-multipoint (PTMP) PVC mode to support multicast service, lacks perfect solution for multicast service.

Use growing demand at IP DSLAM, a kind of DSLAM equipment that adopts ethernet technology to make up occurred, as shown in Figure 4.The DSLAM system adopts the Ethernet switching fabric, and backboard distribution industry ethernet is by the intercommunication between ethernet switch technology realization appliance services interface and the upstream Interface.For xDSL access technology,, in device interface module, realize adaptive between ATM and the Ethernet being converted to Ethernet message connecting system backboard as ADSL based on atm technology.System core parts are ethernet switching module, realize functions such as message switching, forwarded upstream, Business Stream processing by this module, and up Ethernet SNI interface is provided.

Though this DSLAM equipment shown in Figure 4 is compared with the DSLAM equipment of ATM framework, the IP DSLAM equipment of Ethernet framework is fit to the development trend of current backbone network IPization more, is more novel DSLAM equipment, also has its intrinsic shortcoming:

(1) is not suitable for the atm network structure.Though the development and change trend comparison of backbone network IPization is obvious, but the scale of atm network is still very huge, particularly for some Incumbents, its atm network construction is quite perfect, born the work of extensive broadband network operation, still there is dilatation in some ATM backbone networks, and many DSLAM build still needs to insert atm network.And the DSLAM product of Ethernet framework does not generally possess atm interface, and perhaps needing repeatedly to carry out protocol conversion provides atm interface, and treatment effeciency is low.

(2) can not provide the integrated service ability.The carrying integrated service is another advantage of ATM framework; and the DSLAM equipment of Ethernet framework can't be realized the multi-service support based on atm technology;, circuit emulation service (CES) professional as frame relay (FR), and these business are also significant for the existing network investment of protection operator.

(3) system bandwidth is low, and business support ability is still very weak.The industry ethernet of common employing low speed is realized the connection between each business interface module in the DSLAM system of Ethernet framework, the single module interface bandwidth generally is no more than 100M, the average interface bandwidth of user is still very low, supports that the ability of big capacity multicast service and high bandwidth business is also very limited.

In a word, existing DSLAM equipment has bandwidth than shortcomings such as low and integrated service ability.

Summary of the invention

The invention provides a kind of Digital Subscriber Line Access Multiplexer and customer access equipment, have the problem of bandwidth than low and integrated service ability to solve existing access device.

For addressing the above problem, the invention provides following technical scheme:

A kind of Digital Subscriber Line Access Multiplexer comprises: the system module of upstream Interface is provided, the service interface board of business interface is provided, and the system bus of connected system module and service interface board; Wherein: described system module comprises fixed length packet interface module at least, is used to realize bus interface and Business Processing; Described system bus comprises the fixed length packet-switched bus that is connected with described fixed length packet interface module; Described service interface board comprises first interface board that is connected with described fixed length packet-switched bus.

Described system module also comprises the Ethernet adaptation module that is connected with described fixed length packet interface module, and this Ethernet adaptation module has the IP upstream Interface.

Described system module also comprises the Ethernet adaptation module that is connected with described fixed length packet interface module, and with the ethernet switching module that this Ethernet adaptation module is connected, this ethernet switching module has the IP upstream Interface.

Described system bus also comprises the high speed Ethernet exchange bus that is connected with described ethernet switching module; Described service interface board also comprises the 3rd interface board that is connected with described high speed Ethernet exchange bus.

Described system bus also comprises the low speed Ethernet switching bus that is connected with described ethernet switching module; Described service interface board also comprises the 4th interface board that is connected with described low speed Ethernet switching bus.

Described system module also comprises the multicast processing module that is connected with described ethernet switching module; Described system bus also comprises the high speed multicast bus that is connected with described multicast processing module; Described service interface board also comprises the 5th interface board that is connected with described low speed Ethernet switching bus with described high speed multicast bus.

Described system bus comprises that also the fixed length package that is connected with described fixed length packet interface module broadcasts bus, and described service interface board also comprises with this fixed length package broadcasts second interface board that bus is connected with described fixed length packet-switched bus; And/or described system module also comprises the ATM uplink processing module that is connected with described fixed length packet interface module, and this ATM uplink processing module has the ATM upstream Interface.

A kind of Digital Subscriber Line Access Multiplexer comprises: the system module of upstream Interface is provided, the service interface board of business interface is provided, and the system bus of connected system module and service interface board; Wherein: described system module comprises the ethernet switching module with IP upstream Interface at least; Described system bus comprises the Fast Ethernet bus that is connected with described ethernet switching module, or/and low speed Ethernet switching bus; Described service interface board comprises the 3rd interface board that is connected with described Fast Ethernet bus, or/and the 4th interface board that is connected with described low speed Ethernet switching bus.

Described system module also comprises the Ethernet adaptation module that is connected with described ethernet switching module, the fixed length packet interface module that is connected with this Ethernet adaptation module; Described system bus also comprises the fixed length packet-switched bus that is connected with this fixed length packet interface module; Described service interface board also comprises first interface board that is connected with this fixed length packet-switched bus.

Described system module also comprises the multicast processing module that is connected with described ethernet switching module, described system bus also comprises the high speed multicast bus that is connected with described multicast processing module, and described service interface board also comprises the 5th interface board that is connected with described high speed multicast bus or is connected with described low speed Ethernet switching bus with described high speed multicast bus; And/or described system module also comprises the ATM uplink module that is connected with described fixed length packet switch module.

A kind of customer access equipment comprises main frame and from frame; Wherein:

Described main frame comprises: system module, have IP upstream Interface and/or ATM(Asynchronous Transfer Mode) upstream Interface, and be used for equipment, interface management, total line traffic control and Business Processing; Service interface board is used to provide business interface; System bus connects described system module and service interface board, is used for data message transmission; Describedly comprise from frame: service interface board is used to provide business interface; System bus is connected with described service interface board; Described main frame and from the frame cascade.

The present invention compared with prior art has following beneficial effect:

1, DSLAM of the present invention can provide multiple bus and corresponding business interfaces such as high speed multicast bus, high speed Ethernet exchange bus and fixed length packet-switched bus, thereby elevator system bandwidth and user port bandwidth comprehensively;

2, can multiple DSLAM product form is provided and organically blend according to building needs, can control cost well;

3, can adopt existing mature technology to realize that multi-service inserts, so its business support ability is strong;

4,, thereby have stronger multicast performance power than existing DSLAM because DSLAM of the present invention has high speed multicast bus and the fixed length package is broadcast bus, but the vitality of lifting means;

5, the present invention can provide IP upstream Interface by ethernet switching module, thereby IP DSLAM performance of the present invention can produce qualitative leap, can provide gigabit to arrive user board;

6,, thereby possesses the integrated service ability because DSLAM of the present invention can provide atm network side upstream Interface and ATM business interface.

Description of drawings

Fig. 1 is the basic configuration schematic diagram of ADSL system in the prior art;

Fig. 2 is the DSLAM structural representation of available technology adopting atm technology;

Fig. 3 is the DSLAM structural representation of available technology adopting ATM switching network structure;

The DSLAM structural representation that Fig. 4 makes up for the available technology adopting ethernet technology;

Fig. 5 to Figure 11 is the ATM DSLAM structural representation that the present invention is based on fixed length packet bus framework;

Figure 12 to Figure 16 is the IP DSLAM structural representation that the present invention is based on the Ethernet framework;

Figure 17 is the schematic diagram of DSLAM of the present invention by the cascade of fixed length packet bus;

Figure 18 is the schematic diagram of DSLAM of the present invention by the adaptive cascade of bus;

Figure 19 is the schematic diagram of DSLAM of the present invention by the Ethernet cascade;

Figure 20 is the schematic diagram of DSLAM of the present invention in the networking cascade.

Embodiment

Digital Subscriber Line Access Multiplexer of the present invention (DSLAM) comprises system module, system bus and service interface board.System module is realized equipment control, interface management, total line traffic control and the Business Processing of whole DSLAM, system bus is the combination at the multiple bus of different functions of the equipments and performance requirement, to satisfy the professional and evolution demand of different DSLAM, service interface board provides according to the system bus type, to satisfy different application and performance requirement.Below in conjunction with accompanying drawing DSLAM of the present invention is elaborated.

Consult the Digital Subscriber Line Access Multiplexer based on the fixed length packet bus shown in Figure 5 (DSLAM), it comprises a system module of realizing equipment control, interface management, total line traffic control and the Business Processing of whole DSLAM.System module comprises in this structure: have the ATM uplink processing module of ATM(Asynchronous Transfer Mode) upstream Interface, the fixed length packet interface module that is connected with this ATM uplink processing module.System bus comprises: the fixed length packet-switched bus and the fixed length package that are connected with fixed length packet interface module are broadcast bus.Service interface board comprises: the first interface board A that is connected with the fixed length packet-switched bus.

Fixed length packet interface module realization fixed length packet-switched bus and fixed length package are broadcast the interface and the Business Processing of bus, are generally the ATM bus interface module, and implementation method comprises employing switch type ATM bus control unit or ATM switching network.

The ATM uplink processing module realizes atm user-network interface (UNI) or Network-Network interface, and (Network-Network Interface, NNI) function are carried out the ATM encapsulation of standard with the fixed length bag of internal system, and ATM are provided upstream Interface.

The fixed length packet-switched bus can be multiple bus type, is used for carrying out between system module and each service interface board the two-way exchange of fixed length message.Among this class fixed length message, most typical is exactly ATM cell.The fixed length packet-switched bus includes but not limited to that the universal test of ATM and operating physical connect shared bus or star bus such as (UTOPIA) bus, cell bus (CELLBUS), ATM universal serial bus.By the fixed length packet-switched bus, the whole systemic-functions of DSLAM that this DSLAM equipment can possess the ATM framework provide business interface, upstream Interface and the subtending port of ATM type.Fixed length packet-switched bus in this DSLAM equipment can be 1 cover or many covers, to satisfy different systematic function requirements.

It can be multiple bus type equally that the fixed length package is broadcast bus, realizes handling based on the multicast service of fixed length packet switch by this bus.This bus is used existing fixed length packet bus signal definition, includes but not limited to that the universal test of ATM and operating physical connect shared bus or star bus such as (UTOPIA) bus, cell bus (CELLBUS), ATM universal serial bus, transmit unidirectional multicast service.By this bus, can make the DSLAM equipment of ATM framework possess big capacity multicast service tenability, and needn't change systematic functional structrue, keep service interface board only to possess the ATM layer function.It can be 1 cover or many covers that fixed length package in this DSLAM equipment is broadcast bus, to satisfy different systematic function requirements.

The first interface board A is the interface board based on the fixed length packet-switched bus.This class veneer comprises the whole interface single plates based on the DSLAM equipment of ATM system architecture, the function that these veneers are realized comprises, XDSL service accesses such as ADSL, SHDSL, VDSL are provided, provide private line services such as Ethernet, circuit simulation, frame relay to insert, the ATM subtending port of DSLAM etc. is provided.For most widely used ADSL veneer in the DSLAM equipment, its whole up-downgoing flows all pass through this fixed length packet-switched bus and transmit.

DSLAM shown in Figure 6 has increased the fixed length package and has broadcast bus on the basis of structure shown in Figure 5, and broadcasts the second interface board B that bus is connected with the fixed length packet-switched bus with the fixed length package.

The second interface board B is for broadcasting the interface board of bus based on fixed length packet-switched bus and fixed length package.On backplane interface, the second interface board B and the first interface board category-A seemingly link to each other with fixed length packet interface module in the system module, are generally atm interface and processing module.On the second interface board B, only carry out ATM layer processing capacity, do not handle Ethernet or upper-layer service more.Different is, interface board B has increased the multicast bus interface than interface board A, and this multicast bus can reach other multicast service disposal ability of several Gbit/s levels, makes the DSLAM system based on ATM satisfy the requirement of high-performance multicast service.In the second interface board B, because the multicast service of big flow is divided to the fixed length package and broadcasts bus, therefore the load of fixed length packet-switched bus alleviates, that is to say, the fixed length packet bus can be shared by more user interface, therefore, the second interface board B can have higher port density than the first interface board A.

DSLAM shown in Figure 6 compares with existing common ATM DSLAM, possessed jumbo fixed length package and broadcast bus, multicast service can be diverted to the fixed length package in internal system and broadcast bus, carry the general data business by the fixed length packet-switched bus, thereby improved systematic function and the place capacity of ATM DSLAM.

Consult shown in Figure 7, this DSLAM is based on the ATM of fixed length packet bus framework, IP DSLAM, it is compared with DSLAM shown in Figure 5, in system module, increased the Ethernet adaptation module that is connected with fixed length packet interface module, realize the adaptive and network side IP upstream Interface of interface by this Ethernet adaptation module, realize the IP operation function.This DSLAM equipment both can directly provide the ATM upstream Interface to use as ATMDSLAM, also can use as IP DSLAM by the adaptive IP upstream Interface that provides of Ethernet, and ATM and IP upstream Interface can also be provided simultaneously.

Consult shown in Figure 8ly, this DSLAM increases Ethernet adaptation module, the ethernet switching module that is connected with the Ethernet adaptation module on the basis of DSLAM structure shown in Figure 6.

Ethernet switching module is the nucleus module of system, and it realizes control of Ethernet switching bus and service processing function, and this ethernet switching module directly provides the IP upstream Interface of system, is particularly useful for as jumbo DSLAM equipment.

The Ethernet adaptation module realizes both protocol adaptation between ethernet switching module and fixed length packet interface module, realize message disjunction and reorganization, protocol encapsulation and buffer memory forwarding capability between Ethernet and ATM fixed length cell.

Consult shown in Figure 9ly, this DSLAM has increased the Ethernet high-speed bus that is connected with ethernet switching module on the basis of Fig. 8, and the 3rd interface board C that is connected with this bus.

Described high speed Ethernet exchange bus includes but not limited to 1000M Ethernet star bus, G.link star bus or the star-like industry ethernet of other high speeds.This bus bandwidth is generally more than 1000Mbit/s.Improved the interface bandwidth of each interface module in the DSLAM equipment greatly by the high speed Ethernet exchange bus, and realized Ethernet message switching between each interface module and the system module by the LAN SW module in the system module.

The 3rd interface board C is the interface board based on the high speed Ethernet exchange bus.The high speed Ethernet exchange bus is star-like high-bandwidth bus, and interface board C all realizes based on this bus.Communicate with big capacity ethernet switching module in the system module by the standard ethernet interface, realize that Ethernet service handles.When interface such as ADSL was provided as interface board C, the ATM cell that needs to realize adsl interface was adaptive to backboard high speed Ethernet exchange bus.The high speed Ethernet exchange bus has very high bandwidth, can reach more than the 1000Mbit/s, has guaranteed that fully the interface board C of high density DSLAM system can reach very high port density.Interface board C also can be used as the more interface board of high bandwidth, as: the optical fiber access interface that Fiber to the home (FTTH), or as other high-speed interfaces, or as other high-speed interfaces; And for example: directly provide gigabit ethernet interface as the DSLAM uplink interface board, provide subtending port as DSLAM cascade converge plate, provide RPR or MSTP coffret as DSLAM networking interface board, provide BAS Broadband Access Server (BAS) function as service processing board etc.

Consult shown in Figure 10ly, this DSLAM has increased the low speed Ethernet switching bus that is connected with ethernet switching module on the basis of structure shown in Figure 9, the 4th interface board D that is connected with this bus.

Described low speed Ethernet switching bus includes but not limited to 100M Ethernet star bus.Low speed Ethernet switching bus is the bus that the DSLAM equipment of existing Ethernet framework is supported, realizes Ethernet message switching between each interface module and the system module by ethernet switching module in the system module and low speed industry ethernet.This DSLAM equipment possesses this bus interface, can possess repertoire, performance and the business support ability of the DSLAM equipment of current Ethernet framework.

Described interface board D is the interface board based on low speed Ethernet switching bus, and this class veneer comprises current whole interface boards based on Ethernet framework DSLAM equipment, and XDSL business interfaces such as ADSL, SHDSL, VDSL are provided, and keeps the compatibility to existing system.These veneers satisfy basic broadband access function, but since interface bandwidth lower, be generally 100Mbit/s, its business development ability a little less than.

The high speed Ethernet exchange bus is the development and the enhancing of original low speed Ethernet switching bus, and in system bus structure, both can independently physically exist, and also can pass through Ethernet rate adaptation technology and shared same set of physical bus.

Consult shown in Figure 11ly, this DSLAM has increased the multicast processing module on the basis of Figure 10, the high speed multicast bus that is connected with this multicast processing module, the 5th interface board that is connected with the low speed industry ethernet with this high speed multicast bus.This DSLAM is the DSLAM of a kind of Almightiness type (or complete compatible).

Described multicast processing modules implement Ethernet multicast control and multicast message duplicate forwarding capability, adopt the hardware reproduction technology to realize the processing of high-performance multicast service.

Described high speed multicast bus is a broadband high-performance multicast bus, satisfy big capacity group broadcasting video frequency business demand, the design of high speed multicast bus is general identical with the high speed Ethernet exchange bus, adopt the star bus structure, provide multicast service for each interface module under the multicast processing module control in system module.High speed multicast bus also can adopt the shared bus mode to realize that multicast data flow transmits.This bus significant feature is to cooperate low speed Ethernet switching bus, promotes DSLAM system multicast performance.

Described interface board E is the interface board based on low speed Ethernet switching bus and high speed multicast bus.High speed multicast bus can realize based on fast Ethernet technology, reaches the above bandwidth of 1000Mbit/s, makes system possess high-performance multicast service tenability.Because high speed multicast bus shunts big flow multicast, so low speed Ethernet switching bus only is used for the carrying of interactive service (as online), makes interface board E compare with interface board D, and its business support ability has had significantly and promotes.

In Fig. 7, Fig. 8, Fig. 9, Figure 10 and DSLAM structure shown in Figure 11, can there be the ATM uplink module yet, only provide IP upstream Interface by the Ethernet adaptation module.Equally, to broadcast bus, high speed multicast bus and relevant interface board can be respectively 1 cover or many covers for the exchange of low speed Ethernet, high speed Ethernet exchange bus, fixed length packet-switched bus, fixed length package in these DSLAM structures, to satisfy different systematic function requirements.

Consult shown in Figure 12ly, this DSLAM is based on low speed Ethernet switching bus and makes up IP DSLAM equipment.Its system module comprises ethernet switching module, and system bus comprises the low speed Ethernet switching bus that is connected with ethernet switching module, and business board comprises the 4th interface board D that is connected with this bus.The function of multicast processing module, low speed Ethernet switching bus and the 4th interface board D and effect are as previously mentioned.

Consult shown in Figure 13ly, this DSLAM is based on the high speed Ethernet exchange bus and makes up IP DSLAM equipment, changes the low speed Ethernet switching bus of DSLAM shown in Figure 12 into the high speed Ethernet exchange bus, has promoted the industry ethernet performance among Figure 12.The corresponding business plate comprises the 3rd interface board C that employing is connected with this Fast Ethernet bus.The function of high speed Ethernet exchange bus and the 3rd interface board C and effect are as previously mentioned.

Comprehensively Figure 12 and DSLAM structure shown in Figure 13 promptly have low speed and high speed Ethernet exchange bus and relevant interface board among a DSLAM simultaneously.

Consult shown in Figure 14, this DSLAM is on the basis of DSLAM structure shown in Figure 12, in system module, increase the multicast processing module that is connected with ethernet switching module, in system bus, increase the high speed multicast bus that is connected with this multicast processing module, in service interface board, increase the 5th interface board E that is connected with low speed Ethernet switching bus with this high speed multicast bus.

Consult shown in Figure 15ly, this DSLAM has increased Fast Ethernet bus and corresponding the 3rd interface board C that is connected with ethernet switching module on the basis of DSLAM structure shown in Figure 14.

Consult shown in Figure 16ly, this DSLAM is on the basis of DSLAM structure shown in Figure 15, increases Ethernet adaptation module, fixed length packet interface module and the ATM uplink module that is connected with ethernet switching module in system module; System bus has increased the fixed length packet-switched bus that is connected with fixed length packet interface module; Service interface board has increased by the first interface board A that is connected with the fixed length packet-switched bus.Certainly as required, can there be the ATM uplink module yet.

Each module in the above-mentioned DSLAM equipment is divided by logic function, in realization, may reside in same hardware integrated circuit board, or satisfies these demands by different integrated circuit board combinations.

Along with the continuous development of chip and system design level, the port density of DSLAM equipment is compared when being born and is greatly improved, but the capacity of single frame DSLAM is limited all the time.The power system capacity of current single frame DSLAM equipment is generally at 400～700 ports, and some highdensity DSLAM equipment single frames can reach about 1000 ports.Even like this, still be not enough to satisfy big capacity DSLAM office point construction demand, so DSLAM must possess the Multi-frame cascading function, to form jumbo DSLAM system.In addition, converge or the port resource of the backbone layer network equipment in order to save, the DSLAM equipment of a plurality of office points also needs to insert upper layer network through after the tandem, and this tandem function is also often finished by DSLAM self, and these all need DSLAM equipment to possess cascade function.Aforesaid DSLAM equipment possesses multiple cascade system, has different characteristics, performance and applicable situation, below several cascade systems is described respectively:

Cascade system one: fixed length packet bus cascade

Consult shown in Figure 17ly, whole access device comprises main frame and from frame, the DSLAM equipment in the main frame can directly extend by the fixed length packet bus and carry out cascade.In this cascade system,, thereby realize the Multi-frame cascading expansion of DSLAM directly by the fixed length packet bus is extended to from frame.Carrying out the fixed length packet bus when extending expansion, can comprise that fixed length packet-switched bus and fixed length package broadcast bus to support general data business and multicast service respectively.

Adopt fixed length packet bus cascade system, can commence business based on interface board A and interface board B, be fit to carry out ATM access service such as XDSL access and circuit simulation, frame relay, can provide ATM or IP network side interface at main frame from frame.Because directly the mode that adopts bus to extend is carried out cascade, the cascade of this scheme can be adopted simple control method from frame, can not need the master control borad concentrated from frame, directly manages by main frame is unified from the frame interface board.Fixed length packet bus cascade system generally is used for main frame and occasion nearer from frame and that the frame number is few.

In this cascade system, main frame and from frame can be respectively aforementioned have the fixed length packet-switched bus and or the fixed length package broadcast arbitrary DSLAM structure of bus.

Cascade system two: the adaptive cascade of bus

Consult shown in Figure 180ly, expand a plurality of subtending ports by the Ethernet adaptation module in the system module and carry out Multi-frame cascading, in this cascade system, with the interface between fixed length packet bus interface module and the Ethernet adaptation module as subtending port between frame.This interface can adopt standard A TM interface, or the internal interface that defines voluntarily of device interior, realize long-distance transmissions by transmission mediums such as cable or optical fiber, compare with preceding a kind of concatenated schemes, the adaptive concatenated schemes of employing bus has been expanded the distance between master and slave frame greatly, both can also can pass through from the access of frame realization as many frame expansions of big capacity office point to remote DSLAM office point.

Identical with fixed length packet bus concatenated schemes, under the adaptive cascade system of bus, still only broadcast bus from frame and realize that the user inserts by fixed length packet-switched bus and fixed length package, to support general data business and multicast service respectively, can commence business based on interface board A and interface board B from frame, cascade is fit to carry out the XDSL access service, owing to can not supported ATM service accesses such as circuit simulation, frame relay respectively from the unified Ethernet adaptation module that inserts the main frame system module of frame from frame.This cascade system is fit to IP DSLAM application mode, provides the IP network side interface at main frame.

Simple from the control module implementation of frame, only need to realize the fixed length packet bus interface, be converted to system-level connecting port and master control and realize interconnection, and realize from each business board control of frame with Master Communications.

In this cascade system, main frame and can be respectively aforementioned arbitrary DSLAM structure with adaptation module from frame.

Cascade system three: Ethernet cascade

Consult shown in Figure 19, in this cascade system, can expand a plurality of standard ethernet interfaces by the ethernet switching module in the main frame system module is used as from the frame subtending port, realize long-distance transmissions by Ethernet cable or optical fiber, both can also can pass through from the access of frame realization as many frame expansions of big capacity office point to remote DSLAM office point.

Under this cascade system, can support the miscellaneous service veneer from frame, be fit to carry out the XDSL access service.Because cascade is respectively adopted the Ethernet cascaded link from frame, can not support ATM service accesses such as circuit simulation, frame relay from frame.This cascade system is fit to IP DSLAM application mode, provides the IP network side interface at main frame.

In this cascade system, main frame and can be respectively aforementioned arbitrary DSLAM structure with ethernet switching module from frame.

Figure 20 has shown the cascade network mode of the multiple structure DSLAM of the present invention, consults aforesaid various structure, does not repeat them here.

Various DSLAM equipment provided by the invention is in various broadband accesss are built, can either satisfy current large scale network requirements on Construction, the development of broadband access technology faces the future again, can realize ripe access technology and broadband access technology demands for development emerging and future such as ADSL, as ADSL2+, VDSL2, FTIP etc.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1, a kind of Digital Subscriber Line Access Multiplexer comprises: the system module of upstream Interface is provided, the service interface board of business interface is provided, and the system bus of connected system module and service interface board; It is characterized in that:

Described system module comprises fixed length packet interface module at least, is used to realize bus interface and Business Processing;

Described system bus comprises the fixed length packet-switched bus that is connected with described fixed length packet interface module;

Described service interface board comprises first interface board that is connected with described fixed length packet-switched bus.

2, Digital Subscriber Line Access Multiplexer as claimed in claim 1 is characterized in that, described system module also comprises the Ethernet adaptation module that is connected with described fixed length packet interface module, and this Ethernet adaptation module has the IP upstream Interface.

3, subscribers feeder as claimed in claim 1 inserts multiplexer, it is characterized in that, described system module also comprises the Ethernet adaptation module that is connected with described fixed length packet interface module, and with the ethernet switching module that this Ethernet adaptation module is connected, this ethernet switching module has the IP upstream Interface.

4, subscribers feeder as claimed in claim 3 inserts multiplexer, it is characterized in that described system bus also comprises the high speed Ethernet exchange bus that is connected with described ethernet switching module; Described service interface board also comprises the 3rd interface board that is connected with described high speed Ethernet exchange bus.

5, subscribers feeder as claimed in claim 4 inserts multiplexer, it is characterized in that described system bus also comprises the low speed Ethernet switching bus that is connected with described ethernet switching module; Described service interface board also comprises the 4th interface board that is connected with described low speed Ethernet switching bus.

6, subscribers feeder as claimed in claim 5 inserts multiplexer, it is characterized in that described system module also comprises the multicast processing module that is connected with described ethernet switching module; Described system bus also comprises the high speed multicast bus that is connected with described multicast processing module; Described service interface board also comprises the 5th interface board that is connected with described low speed Ethernet switching bus with described high speed multicast bus.

7, insert multiplexer as each described subscribers feeder of claim 1 to 6, it is characterized in that, described system bus comprises that also the fixed length package that is connected with described fixed length packet interface module broadcasts bus, and described service interface board also comprises with this fixed length package broadcasts second interface board that bus is connected with described fixed length packet-switched bus; And/or described system module also comprises the ATM(Asynchronous Transfer Mode) uplink processing module that is connected with described fixed length packet interface module, and this ATM uplink processing module has the ATM upstream Interface.

8, require 7 described subscribers feeders to insert multiplexer as claim, it is characterized in that the first, second, third, fourth and/or the 5th interface board is a plurality of; Or described fixed length package is broadcast bus and the fixed length packet-switched bus includes but not limited to that the universal test of ATM and operating physical connect (UTOPIA) bus, cell bus (CELLBUS), ATM universal serial bus shared bus and star bus.

9, a kind of Digital Subscriber Line Access Multiplexer comprises: the system module of upstream Interface is provided, the service interface board of business interface is provided, and the system bus of connected system module and service interface board; It is characterized in that:

Described system module comprises the ethernet switching module with IP upstream Interface at least;

Described system bus comprises the Fast Ethernet bus that is connected with described ethernet switching module, or/and low speed Ethernet switching bus;

Described service interface board comprises the 3rd interface board that is connected with described Fast Ethernet bus, or/and the 4th interface board that is connected with described low speed Ethernet switching bus.

10, subscribers feeder as claimed in claim 9 inserts multiplexer, it is characterized in that described system module also comprises the Ethernet adaptation module that is connected with described ethernet switching module, the fixed length packet interface module that is connected with this Ethernet adaptation module; Described system bus also comprises the fixed length packet-switched bus that is connected with this fixed length packet interface module; Described service interface board also comprises first interface board that is connected with this fixed length packet-switched bus.

11, insert multiplexer as claim 9 or 10 described subscribers feeders, it is characterized in that, described system module also comprises the multicast processing module that is connected with described ethernet switching module, described system bus also comprises the high speed multicast bus that is connected with described multicast processing module, and described service interface board also comprises the 5th interface board that is connected with described high speed multicast bus or is connected with described low speed Ethernet switching bus with described high speed multicast bus; And/or described system module also comprises the ATM uplink module that is connected with described fixed length packet switch module.

12, Digital Subscriber Line Access Multiplexer as claimed in claim 7 is characterized in that, the first, the 3rd, the 4th and/or the 5th interface board is a plurality of; Or described fixed length packet-switched bus includes but not limited to that the universal test of ATM and operating physical connect (UTOPIA) bus, cell bus (CELLBUS), ATM universal serial bus shared bus and star bus.

13, a kind of customer access equipment comprises main frame and from frame; It is characterized in that described main frame comprises:

System module has IP upstream Interface and/or ATM(Asynchronous Transfer Mode) upstream Interface, is used for equipment, interface management, total line traffic control and Business Processing;

Service interface board is used to provide business interface;

System bus connects described system module and service interface board, is used for data message transmission;

Describedly comprise from frame:

Service interface board is used to provide business interface;

System bus is connected with described service interface board;

Described main frame and from the frame cascade.

14, customer access equipment as claimed in claim 13, it is characterized in that, described main frame and comprise respectively that from the system bus of frame fixed length packet-switched bus and fixed length package broadcast bus, described main frame and broadcast the bus cascade by this fixed length packet-switched bus and/or fixed length package from frame.

15, customer access equipment as claimed in claim 13, it is characterized in that, the system module of described main frame comprises ethernet switching module and the fixed length packet interface module that is connected with system bus, and the Ethernet adaptation module that connects ethernet switching module and fixed length packet interface module; Describedly also comprise the fixed length packet interface module that is connected with system bus from frame, described main frame and from frame by this fixed length packet interface module and the cascade of Ethernet adaptation module.

16, customer access equipment as claimed in claim 13 is characterized in that, the described system module with IP upstream Interface and/or ATM(Asynchronous Transfer Mode) upstream Interface that also comprises from frame; Main frame and have ethernet switching module respectively from the system module of frame, and by this ethernet switching module cascade.