CN102315892A

CN102315892A - Data forwarding device, cable fastener plates and data forwarding method

Info

Publication number: CN102315892A
Application number: CN2010102249491A
Authority: CN
Inventors: 杨武
Original assignee: Hangzhou H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2010-07-02
Filing date: 2010-07-02
Publication date: 2012-01-11
Anticipated expiration: 2030-07-02
Also published as: CN102315892B

Abstract

The invention discloses a data forwarding device, cable fastener plates and a data forwarding method. In the invention, first cable fastener plates with a circuit simulation service function and second cable fastener plates with an Ethernet transmitting and receiving function are provided; a time division multiplex (TDM) clean kernel of the conventional TDM service mode of which an input interface and an output interface are TDM interfaces can be forwarded by using the reverse butt joint of two first cable fastener plates; and the TDM clean kernel of a pseudowire simulation (TDM over internet protocol (IP)/ multiple protocol label switching (MPLS)) service mode of which the input interface and the output interface are the TDM interface and an Ethernet interface can be forwarded by using the sequential series connection of the first cable fastener plates and the second cable fastener plates, so the conventional TDM service mode and the TDM over IP/MPLS service mode can be combined based on distributed structures of the first cable fastener plates and the second cable fastener plates.

Description

Data forwarding device and cable card board and data forwarding method

Technical field

The present invention relates to time division multiplexing (Time Division Multiplex; TDM) transmission technology of business datum particularly can merge a kind of data forwarding device, cable card board and the data forwarding method of traditional TDM business model and pseudo-circuit emulation (TDM overIP/MPLS) business model.

Background technology

TDM is meant through the intersection digit pulse in different channels or the time slot, on same communication medium, transmits the technology of a plurality of digitalized datas, voice and video signal etc. simultaneously.

Telephone network (PSTN) is a kind of circuit-switched network based on the TDM technology, and it is called the TDM accesses network usually again.Telephone exchange among the PSTN is supported time division multiplexing through some specific forms, for example, DS0, its channel width is 64Kbps; ISDN/BRI, it is supported the communication link of 128Kbps and has 2 64kbps time slots; E1, it is supported the communication link of 2.048Mbps and is divided into 32 time slots that are spaced apart 64Kbps; Ti, it is supported the communication link of 1.544Mbps and is divided into 24 time slots that are spaced apart 64Kbps; Also have E3/T3, POS, CPOS or the like in addition.

With E1/T1 is example; Shown in Fig. 1 a and 1b; Mainly utilize the function of multichannel high level data link controller (HDLC) to realize filling, sign detection, byte-aligned, data bit upset, the zero padding of the clean nuclear of TDM in the TDM business processing device based on E1/T1 and go to fill and CRC produces and functions such as verification (be in known in the art technology, this paper no longer detail like other unit in Fig. 1 a and the 1b shown device); Then, can directly between the TDM business processing device, transmit TDM through circuit-switched network examines only.

Along with the network technology evolution and the network integration, in the next generation network be the elementary cell mode of carrying out network data transmission and exchange, be that packet switching network will occupy dominant position with data.Wherein, Internet protocol (IP)/multiprotocol label switching (Multiprotocol Label Switching based on ethernet technology; MPLS) network is the representative of packet package switching network; Because Ethernet has advantages such as transmission rate height, cost are low, thereby the TDM business will be to the IP/MPLS network migration, thereby makes TDM overIP/MPLS technology arise at the historic moment.

So-called TDM over IP/MPLS technology, the IP/MPLS network transparent transmission that makes up through Ethernet exactly send TDM to examine only.The basic principle of TDM over IP/MPLS technology promptly is equivalent to artificial circuit exchange on the IP/MPLS network.As shown in Figure 2; The integrated chip that source end TDM over IP/MPLS business processing device is inner; Can receive the TDM that other functional units produce through its E1/T1 Interface and examine (the present invention do not pay close attention to and how to produce TDM and examine only, so this paper no longer give unnecessary details) only, and the clean nuclear of TDM is encapsulated as message, be sent to destination through Ethernet interface via the IP/MPLS network then through circuit emulation service to how producing the clean nuclear of TDM; The inner integrated chip of destination TDM over IP/MPLS business processing device recovers from the message that is received from the IP/MPLS network through circuit emulation service that original TDM examines only and then offer other functional units through the clean nuclear of original TDM that its E1/T1 Interface will recover handles.

Wherein, The implementation of circuit emulation service; Be to utilize the circuit simulation adapter head of special format that the clean nuclear of TDM is encapsulated; Carry frame format information, warning information, signaling information and the synchronous timing information etc. of the clean nuclear of TDM in the circuit simulation adapter head of special format, so the message after the encapsulation is called pseudo wire PDU, after this again with agreement carrying pseudo-line messages such as IP, MPLS, L2TP, promptly can pass through packet switching network after utilizing Ethernet frame head encapsulation pseudo wire PDU; Correspondingly, the pseudo wire PDU of band Ethernet frame head is removed the Ethernet frame head and can be realized the decapsulation that TDM examines only with the circuit simulation adapter head after arriving destination.

Packet switching network improves TDM traffic transmission efficient, also reduction realizes cost though above-mentioned TDM over IP/MPLS technology can be utilized; But; Packet switching network neither overnight can substitute the existing professional circuit-switched network of TDM of serving fully, that is, serve two kinds of professional networks of TDM and can for a long time and deposit; Correspondingly, for example the TDM over IP/MPLS business processing device shown in the existing TDM business processing device shown in Fig. 1 a and Fig. 1 b and Fig. 2 also can for a long time and be deposited.And because TDM interface function, operation principle, implementation professional and that TDM over IP/MPLS is professional is all inequality; Thereby at all can't be compatible; Thereby in order to adapt to two kinds and the network deposited and have to use respectively two kinds of incompatible devices, and then can improve user cost greatly.

Summary of the invention

In view of this, the invention provides a kind of data forwarding device, cable card board and data forwarding method, can merge traditional TDM business model and TDM over IP/MPLS business model.

A kind of data forwarding device provided by the invention; This device comprises: at least two first cable card boards with TDM interface; At least one second cable card board with Ethernet interface, and, can realize between first cable card board, mutual network board between first cable card board and second cable card board;

Wherein, first cable card board comprises that circuit emulation service unit and the first message retransmission unit, second cable card board comprise the second message retransmission unit and Ethernet control unit;

In first cable card board as the incoming interface plate, the clean nuclear of TDM that the circuit emulation service unit receives the TDM interface is encapsulated as the pseudo wire PDU of band Ethernet frame head; The first message retransmission unit will be encapsulated as message between plate with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head, and message between this plate is sent to other first cable card boards or second cable card board as corresponding outgoing interface plate through network board;

In second cable card board as the incoming interface plate, the Ethernet control unit is forwarded to the second message retransmission unit with the pseudo wire PDU of the band Ethernet frame head that Ethernet interface receives; The second message retransmission unit will be encapsulated as message between plate with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head, and message between this plate is sent to first cable card board as corresponding outgoing interface plate through network board;

In first cable card board as outgoing interface; The first message retransmission unit receives from being encapsulated as the pseudo wire PDU of band Ethernet frame head as message between the plate of other first cable card boards of corresponding incoming interface plate or second cable card board and with the clean nuclear of the TDM in the message between plate through network board, and the clean nuclear of TDM that the circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head sends through the TDM interface;

In second cable card board as the outgoing interface plate; The second message retransmission unit receives from being encapsulated as the pseudo wire PDU of band Ethernet frame head as message between the plate of first cable card board of corresponding incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board, and the Ethernet control unit will send with the pseudo wire PDU of Ethernet frame head through Ethernet interface.

In first cable card board as the incoming interface plate; The circuit emulation service unit is when being configured to the TDM business model; Further, the clean nuclear of TDM is encapsulated as the pseudo wire PDU of corresponding outgoing interface plate for the band Ethernet frame head of other first cable card boards according to predefined circuit simulation configuration parameter and TDM parameters for tunnel; The circuit emulation service unit is when being configured to pseudo-circuit emulation business model; Further according to circuit simulation configuration parameter and the TDM parameters for tunnel of consulting to obtain, TDM is examined only the pseudo wire PDU of the band Ethernet frame head that to be encapsulated as corresponding outgoing interface plate be second cable card board;

In first cable card board as the outgoing interface plate, the circuit emulation service unit is further examined according to predefined circuit simulation configuration parameter and TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head when being configured to the TDM business model only; The circuit emulation service unit is further examined with TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of being with the Ethernet frame head according to the circuit simulation configuration parameter of consulting to obtain when being configured to pseudo-circuit emulation business model only.

The circuit emulation service unit comprises: protocol processes subelement, TDM interface subelement, shared storage administration and queue scheduling subelement, first ethernet mac are handled subelement; And the TDM time slot extracts subelement and TDM time slot allocation subelement, first message send subelement and first message receives subelement;

When belonging to first cable card board in the circuit emulation service unit as the incoming interface plate; TDM interface subelement is decoded and Clock Extraction to the clean nuclear of TDM that the TDM interface receives; The TDM time slot extracts subelement and from each the tdm data frame after decoding and the Clock Extraction, takes out effective time slot successively, shares in the external cache that storage administration and queue scheduling subelement be saved to effective time slot that takes out in each tdm data frame and signaling sequence the circuit emulation service unit and from external cache, take out effective time slot and signaling according to preset queue priority to send to the protocol engine subelement and be encapsulated as the pseudo wire PDU of being with the Ethernet frame head after first message transmission subelement and first ethernet mac processing subelement send;

When belonging to first cable card board in the circuit emulation service unit as the outgoing interface plate; Share storage administration and queue scheduling subelement and will be sent to the protocol processes subelement through the pseudo wire PDU that first ethernet mac is handled the band Ethernet frame head that subelement and first message reception subelement receive; The protocol processes subelement extracts effective tdm data and divides into groups, is saved in the external cache by shared storage administration and queue scheduling subelement from the pseudo wire PDU of band Ethernet frame head; TDM time slot allocation subelement reads the tdm data grouping and generates the tdm data frame from external cache through sharing storage administration and queue scheduling subelement, and TDM interface subelement sends clean the examining of the TDM that obtains after the tdm data frame is carried out clock recovery and encodes from the TDM interface.

The circuit emulation service unit further comprises: configuration interface subelement, virtual channel tabulation subelement;

The configuration interface subelement issues the configuration order that indication circuit artificial service unit is in TDM business model or pseudo-circuit emulation business model to the management control sub unit; And, in virtual channel tabulation subelement, predefined circuit simulation configuration parameter and TDM parameters for tunnel are set through sharing storage administration and queue scheduling subelement;

And, when the TDM business model, share the self-defined TDM parameters for tunnel that storage administration and queue scheduling subelement tabulate virtual channel in the subelement and offer the protocol processes subelement; When pseudo-circuit emulation business model, the configuration interface subelement issues circuit simulation configuration parameter and TDM parameters for tunnel that negotiation obtain with the queue scheduling subelement to the protocol processes subelement through sharing storage administration.

Another kind of data forwarding device provided by the invention; It is characterized in that; This device comprises: at least two first cable card boards with TDM interface; At least one second cable card board with Ethernet interface, and, can realize between first cable card board, mutual network board between first cable card board and second cable card board;

Wherein, First cable card board comprises the business processing logic unit between circuit emulation service unit and the first message retransmission unit and the circuit emulation service unit and the first message retransmission unit, and second cable card board comprises the second message retransmission unit and Ethernet control unit;

In first cable card board as the incoming interface plate, the clean nuclear of TDM that the circuit emulation service unit receives the TDM interface is encapsulated as the pseudo wire PDU of band Ethernet frame head; The business processing logic unit is sent to other first cable card boards as corresponding outgoing interface plate through network board from obtaining from decapsulation the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit that TDM examines and be forwarded to the first message retransmission unit only and by the first message retransmission unit the clean nuclear of TDM being encapsulated as between plate behind the message when being configured to the TDM business model; The business processing logic unit will directly be forwarded to the first message retransmission unit from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and will be encapsulated as between plate with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head by the first message retransmission unit and be sent to second cable card board as corresponding outgoing interface plate through network board behind the message when being configured to pseudo-circuit emulation pattern;

In first cable card board as outgoing interface; Message is when the business processing logic configuration of cells is the TDM business model between the first message retransmission unit plate; To receive from sending to the business processing logic unit through network board, and the pseudo wire PDU that the clean nuclear of TDM is encapsulated as band Ethernet frame head will be passed to the circuit emulation service unit and carry out flow control by the business processing logic unit as the clean consideration convey of TDM in the message between the plate of other first cable card boards of corresponding incoming interface plate; When the first message retransmission unit is pseudo-circuit emulation pattern in the business processing logic configuration of cells; Will through network board receive from behind the pseudo wire PDU that is encapsulated as band Ethernet frame head as the clean nuclear of the TDM of message between the plate of second cable card board of corresponding incoming interface plate, be forwarded to the business processing logic unit, directly be passed to the circuit emulation service unit by the business processing logic unit; The circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head the clean nuclear of TDM send through the TDM interface;

In first cable card board as the incoming interface plate; When circuit emulation service unit and business processing logic configuration of cells are the TDM business model; The circuit emulation service unit further is encapsulated as the pseudo wire PDU of corresponding outgoing interface plate for the band Ethernet frame head of other first cable card boards according to predefined circuit simulation configuration parameter and TDM parameters for tunnel with the clean nuclear of TDM; The business processing logic unit is further according to predefined circuit simulation configuration parameter and TDM parameters for tunnel, examines only from obtaining TDM from decapsulation the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit; In circuit emulation service unit and business processing logic unit when being configured to pseudo-circuit emulation business model; The circuit emulation service unit is further according to the circuit simulation configuration parameter of consulting to obtain and the TDM parameters for tunnel pseudo wire PDU with the clean nuclear of the TDM band Ethernet frame head that to be encapsulated as corresponding outgoing interface plate be second cable card board so that the pseudo wire PDU of band Ethernet frame head behind business processing logic unit forwards to the first message retransmission unit, can obtain TDM according to circuit simulation configuration parameter of consulting to obtain and the decapsulation from the pseudo wire PDU of being with the Ethernet frame head of TDM parameters for tunnel by the first message retransmission unit and examine only;

In first cable card board as the outgoing interface plate; In circuit emulation service unit and business processing logic unit when being configured to the TDM business model; The circuit emulation service unit is further examined according to predefined circuit simulation configuration parameter and TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head only, and the clean nuclear of TDM that the business processing logic unit further obtains decapsulation in the message between the first message retransmission unit slave plate according to predefined circuit simulation configuration parameter and TDM parameters for tunnel is encapsulated as the pseudo wire PDU of band Ethernet frame head; In circuit emulation service unit and business processing logic unit when being configured to pseudo-circuit emulation business model; The circuit emulation service unit further according to the circuit simulation configuration parameter of consulting to obtain and TDM parameters for tunnel from examining only from decapsulation TDM the pseudo wire PDU of the band Ethernet frame head of business processing logic unit, be the TDM in the message between plate to be examined to encapsulate only according to circuit simulation configuration parameter of consulting to obtain and TDM parameters for tunnel by the first message retransmission unit to obtain from the pseudo wire PDU of the band Ethernet frame head of business processing logic unit.

The TDM interface is a channelizing TDM interface;

And; In first cable card board as the incoming interface plate; In circuit emulation service unit and business processing logic unit when being configured to the TDM business model, the business processing logic unit further will be from the pseudo wire PDU of band Ethernet frame head decapsulation each time slot of obtaining the clean nuclear of TDM be forwarded to the first message retransmission unit respectively.

The business processing logic unit comprises: message processing and control sub unit, packet buffer subelement, second ethernet mac are handled subelement, system's packet interface subelement; And system's bag receives subelement and system's bag sends subelement, second message receives subelement and second message sends subelement;

The business processing logic configuration of cells is that TDM business model and its are when belonging to first cable card board as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; The message processing obtains TDM with predefined self-defined circuit simulation configuration parameter of control sub unit and the decapsulation from the pseudo wire PDU of band Ethernet frame head of self-defined TDM parameters for tunnel and examines and be forwarded to system's bag transmission subelement only, and system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives sent to the first message retransmission unit;

The business processing logic configuration of cells is that pseudo-circuit emulation business model and its are when belonging to first cable card board as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; Message is handled pseudo wire PDU to the system bag transmission subelement with control sub unit transparent transmission band Ethernet frame head, and system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives sent to the first message retransmission unit;

The business processing logic configuration of cells is that TDM business model and its are when belonging to first cable card board as the outgoing interface plate; System's bag receives subelement and examines and be forwarded to message processing and control sub unit only through the TDM that system's packet interface subelement receives from the first message retransmission unit; Message is handled the pseudo wire PDU that according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel the clean nuclear of TDM is encapsulated as band Ethernet frame head with control sub unit; Send subelement to second message and transmit the pseudo wire PDU of band Ethernet frame head and utilize the packet buffer subelement to realize flow control, second message sends subelement and handles subelement sends pseudo wire PDU from band Ethernet frame head to the circuit emulation service unit through second ethernet mac;

The business processing logic configuration of cells is that pseudo-circuit emulation business model and its are when belonging to first cable card board as the outgoing interface plate; The system bag receives subelement and receives from the pseudo wire PDU of the band Ethernet frame head of the first message retransmission unit and be forwarded to message through system's packet interface subelement and handle and control sub unit; Message is handled with control sub unit and is directly sent the pseudo wire PDU that subelement is transmitted band Ethernet frame head to second message, and second message sends subelement and handles subelement sends pseudo wire PDU from band Ethernet frame head to the circuit emulation service unit through second ethernet mac.

The TDM interface is a channelizing TDM interface;

And; In first cable card board as the incoming interface plate; In circuit emulation service unit and business processing logic unit when being configured to the TDM business model, the message in the business processing logic unit handle with control sub unit further will be from the pseudo wire PDU of band Ethernet frame head decapsulation each time slot of obtaining the clean nuclear of TDM be forwarded to system's bag respectively and send subelement.

Message comprises that TDM examines only, straddle is transmitted the circuit simulation adapter head in head and the pseudo wire PDU between plate; This straddle is transmitted in the head and is packaged with routing iinformation, and further utilizes the circuit simulation adapter head that carries in the message between plate that the clean nuclear of TDM is encapsulated as pseudo wire PDU as the first message retransmission unit in first cable card board of outgoing interface plate, as the second message retransmission unit in second cable card board of outgoing interface plate;

Perhaps; Message comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with the circuit simulation adapter head in routing iinformation and the pseudo wire PDU, and further utilizes the circuit simulation adapter head of encapsulation in the straddle forwarding head that the clean nuclear of TDM is encapsulated as pseudo wire PDU as the first message retransmission unit in first cable card board of outgoing interface plate, as the second message retransmission unit in second cable card board of outgoing interface plate;

Perhaps; Message only comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with routing iinformation, and further tables look-up according to inner link layer as the first message retransmission unit in first cable card board of outgoing interface plate, as the second message retransmission unit in second cable card board of outgoing interface plate and to obtain can the clean nuclear of TDM being encapsulated as the circuit simulation adapter head of pseudo wire PDU.

A kind of cable card board provided by the invention, this cable card board have the time division multiplexing tdm interface and comprise the circuit emulation service unit and the first message retransmission unit;

This cable card board is during as the incoming interface plate, and the clean nuclear of TDM that the circuit emulation service unit is received from circuit-switched network with the TDM interface is encapsulated as the pseudo wire PDU of band Ethernet frame head; The first message retransmission unit will be encapsulated as between plate message and will be forwarded to as corresponding outgoing interface plate through network board with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head, so that the TDM in the message sends after endorsing the pseudo wire PDU that is sent or be encapsulated as by the outgoing interface plate band Ethernet frame head after the decapsulation of outgoing interface plate only between this plate;

This cable card board is during as outgoing interface; The first message retransmission unit receives from message between the plate of corresponding incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board and is encapsulated as the pseudo wire PDU of band Ethernet frame head, and the clean nuclear of TDM that the circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head sends through the TDM interface.

At cable card board during as the incoming interface plate; TDM interface subelement is decoded and Clock Extraction to the clean nuclear of TDM that the TDM interface receives; The TDM time slot extracts subelement and from each the tdm data frame after decoding and the Clock Extraction, takes out effective time slot successively, shares in the external cache that storage administration and queue scheduling subelement be saved to effective time slot that takes out in each tdm data frame and signaling sequence the circuit emulation service unit and from external cache, take out effective time slot and signaling according to preset queue priority to send to the protocol engine subelement and be encapsulated as the pseudo wire PDU of being with the Ethernet frame head after first message transmission subelement and first ethernet mac processing subelement send;

At cable card board during as the outgoing interface plate; Share storage administration and queue scheduling subelement and will be sent to the protocol processes subelement through the pseudo wire PDU that first ethernet mac is handled the band Ethernet frame head that subelement and first message reception subelement receive; The protocol processes subelement extracts effective tdm data and divides into groups, is saved in the external cache by shared storage administration and queue scheduling subelement from the pseudo wire PDU of band Ethernet frame head; TDM time slot allocation subelement reads the tdm data grouping and generates the tdm data frame from external cache through sharing storage administration and queue scheduling subelement, and TDM interface subelement sends clean the examining of the TDM that obtains after the tdm data frame is carried out clock recovery and encodes from the TDM interface.

Another kind of cable card board provided by the invention; It is characterized in that; This cable card board has the time division multiplexing tdm interface, and comprises: the business processing logic unit between the circuit emulation service unit and the first message retransmission unit and circuit emulation service unit and the first message retransmission unit;

This cable card board is during as the incoming interface plate, and the clean nuclear of TDM that the circuit emulation service unit receives the TDM interface is encapsulated as the pseudo wire PDU of band Ethernet frame head; The business processing logic unit is when being configured to the TDM business model; Send through network board behind the message from obtaining from decapsulation the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit that TDM examines and be forwarded to the first message retransmission unit only and the clean nuclear of TDM being encapsulated as between plate, sent after the decapsulation of outgoing interface plate to treat that the TDM in the message endorses only between this plate by the first message retransmission unit; The business processing logic unit is when being configured to pseudo-circuit emulation pattern; To directly be forwarded to the first message retransmission unit from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and will be encapsulated as between plate with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head and send through network board behind the message, send after being encapsulated as the pseudo wire PDU of band Ethernet frame head by the outgoing interface plate to treat that the TDM in the message between this plate endorses only by the first message retransmission unit;

This cable card board is during as the outgoing interface plate; Message is when the business processing logic configuration of cells is the TDM business model between the first message retransmission unit plate; The clean consideration convey of TDM between the plate that will receive through network board in the message is sent to the business processing logic unit, by the business processing logic unit pseudo wire PDU that the clean nuclear of TDM is encapsulated as band Ethernet frame head is passed to the circuit emulation service unit and carries out flow control; When the first message retransmission unit is pseudo-circuit emulation pattern in the business processing logic configuration of cells; After the clean nuclear of the TDM of message is encapsulated as the pseudo wire PDU of band Ethernet frame head between the plate that will receive through network board, be forwarded to the business processing logic unit, directly be passed to the circuit emulation service unit by the business processing logic unit; The circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head the clean nuclear of TDM send through the TDM interface.

Cable card board is during as the incoming interface plate; Ifs circuit artificial service unit and business processing logic configuration of cells are the TDM business model; Then the circuit emulation service unit further is encapsulated as the pseudo wire PDU of corresponding outgoing interface plate for the band Ethernet frame head of other first cable card boards according to predefined circuit simulation configuration parameter and TDM parameters for tunnel with the clean nuclear of TDM; The business processing logic unit is further according to predefined circuit simulation configuration parameter and TDM parameters for tunnel, examines only from obtaining TDM from decapsulation the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit; Ifs circuit artificial service unit and business processing logic unit are with being configured to pseudo-circuit emulation business model; Then the circuit emulation service unit is further according to the circuit simulation configuration parameter of consulting to obtain and the TDM parameters for tunnel pseudo wire PDU with the clean nuclear of the TDM band Ethernet frame head that to be encapsulated as corresponding outgoing interface plate be second cable card board so that the pseudo wire PDU of band Ethernet frame head behind business processing logic unit forwards to the first message retransmission unit, can obtain TDM according to circuit simulation configuration parameter of consulting to obtain and the decapsulation from the pseudo wire PDU of being with the Ethernet frame head of TDM parameters for tunnel by the first message retransmission unit and examine only;

Cable card board is during as the outgoing interface plate; Ifs circuit artificial service unit and business processing logic unit are with being configured to the TDM business model; Then the circuit emulation service unit is further examined according to predefined circuit simulation configuration parameter and TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head only, and the clean nuclear of TDM that the business processing logic unit further obtains decapsulation in the message between the first message retransmission unit slave plate according to predefined circuit simulation configuration parameter and TDM parameters for tunnel is encapsulated as the pseudo wire PDU of band Ethernet frame head; Ifs circuit artificial service unit and business processing logic unit are with being configured to pseudo-circuit emulation business model; Then the circuit emulation service unit further according to the circuit simulation configuration parameter of consulting to obtain and TDM parameters for tunnel from examining only from decapsulation TDM the pseudo wire PDU of the band Ethernet frame head of business processing logic unit, be the TDM in the message between plate to be examined to encapsulate only according to circuit simulation configuration parameter of consulting to obtain and TDM parameters for tunnel by the first message retransmission unit to obtain from the pseudo wire PDU of the band Ethernet frame head of business processing logic unit.

The TDM interface is a channelizing TDM interface;

And; Cable card board is during as the incoming interface plate; Ifs circuit artificial service unit and business processing logic configuration of cells are the TDM business model, then the business processing logic unit further will be from the pseudo wire PDU of band Ethernet frame head decapsulation each time slot of obtaining the clean nuclear of TDM be forwarded to the first message retransmission unit respectively.

The business processing logic configuration of cells is that TDM business model and its place cable card board is during as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; The message processing obtains TDM with predefined self-defined circuit simulation configuration parameter of control sub unit and the decapsulation from the pseudo wire PDU of band Ethernet frame head of self-defined TDM parameters for tunnel and examines and be forwarded to system's bag transmission subelement only, and system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives sent to the first message retransmission unit;

The business processing logic configuration of cells is that pseudo-circuit emulation business model and its place cable card board is during as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; Message is handled pseudo wire PDU to the system bag transmission subelement with control sub unit transparent transmission band Ethernet frame head, and system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives sent to the first message retransmission unit;

The business processing logic configuration of cells is that TDM business model and its place cable card board is during as the outgoing interface plate; System's bag receives subelement and examines and be forwarded to message processing and control sub unit only through the TDM that system's packet interface subelement receives from the first message retransmission unit; Message is handled the pseudo wire PDU that according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel the clean nuclear of TDM is encapsulated as band Ethernet frame head with control sub unit; Send subelement to second message and transmit the pseudo wire PDU of band Ethernet frame head and utilize the packet buffer subelement to realize flow control, second message sends subelement and handles subelement sends pseudo wire PDU from band Ethernet frame head to the circuit emulation service unit through second ethernet mac;

The business processing logic configuration of cells is that pseudo-circuit emulation business model and its place cable card board is during as the outgoing interface plate; The system bag receives subelement and receives from the pseudo wire PDU of the band Ethernet frame head of the first message retransmission unit and be forwarded to message through system's packet interface subelement and handle and control sub unit; Message is handled with control sub unit and is directly sent the pseudo wire PDU that subelement is transmitted band Ethernet frame head to second message, and second message sends subelement and handles subelement sends pseudo wire PDU from band Ethernet frame head to the circuit emulation service unit through second ethernet mac.

The TDM interface is a channelizing TDM interface;

And; Ifs circuit artificial service unit and business processing logic configuration of cells are the TDM business model, then the message in the business processing logic unit handle with control sub unit further will be from the pseudo wire PDU of band Ethernet frame head decapsulation each time slot of obtaining the clean nuclear of TDM be forwarded to system's bag respectively and send subelement.

Message comprises that TDM examines only, straddle is transmitted the circuit simulation adapter head in head and the pseudo wire PDU between plate; This straddle is transmitted in the head and is packaged with routing iinformation; And the first message retransmission unit during as the outgoing interface plate, further utilizes the circuit simulation adapter head that carries in the message between plate that the clean nuclear of TDM is encapsulated as pseudo wire PDU at cable card board;

Perhaps; Message comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with the circuit simulation adapter head in routing iinformation and the pseudo wire PDU; And during as the outgoing interface plate, the circuit simulation adapter head that further utilizes straddle to transmit encapsulation in the head is encapsulated as pseudo wire PDU with the clean nuclear of TDM to the first message retransmission unit at cable card board;

Perhaps; Message only comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with routing iinformation; And the first message retransmission unit, is further tabled look-up according to inner link layer and is obtained can the clean nuclear of TDM being encapsulated as the circuit simulation adapter head of pseudo wire PDU during as the outgoing interface plate at cable card board.

A kind of data forwarding method provided by the invention,

On Way in, this method comprises:

The clean nuclear of TDM that the first incoming interface plate utilizes simulation technology that its time division multiplexing tdm interface is received is encapsulated as the pseudo wire PDU of band Ethernet frame head, again will the clean nuclear of the TDM of band in the pseudo wire PDU of Ethernet frame head be encapsulated as message between plate and be sent to the first outgoing interface plate or the second outgoing interface plate of correspondence through network board;

The clean nuclear of TDM in the pseudo wire PDU of the band Ethernet frame head that the second incoming interface plate receives its Ethernet interface is encapsulated as between plate message and is sent to the first outgoing interface plate as corresponding outgoing interface plate through network board;

On Way out, this method comprises:

The first outgoing interface plate receives from message between the plate of the corresponding first or second incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board and is encapsulated as the pseudo wire PDU of being with the Ethernet frame head, utilizes the simulation technology TDM that decapsulation obtains from the pseudo wire PDU of band Ethernet frame head to examine only and send through the TDM interface again;

The second outgoing interface plate sends through its Ethernet interface after receiving the pseudo wire PDU that is encapsulated as band Ethernet frame head from message between the plate of the corresponding first incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board.

In the method:

The first incoming interface plate utilizes simulation technology, and further according to predefined circuit simulation configuration parameter and TDM parameters for tunnel the clean nuclear of TDM is encapsulated as the pseudo wire PDU of the band Ethernet frame head of the corresponding first outgoing interface plate; The first outgoing interface plate utilizes simulation technology, also further examines only according to predefined circuit simulation configuration parameter and TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head;

The first incoming interface plate utilizes simulation technology, and the circuit simulation configuration parameter further consulting to obtain and the TDM parameters for tunnel pseudo wire PDU that the clean nuclear of TDM is encapsulated as the band Ethernet frame head of the corresponding second outgoing interface plate; The second outgoing interface plate utilizes simulation technology, also further examines only according to the circuit simulation configuration parameter of consulting to obtain and TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head.

On Way out, this method further comprises: the first outgoing interface plate is before utilizing the clean nuclear of the simulation technology TDM that decapsulation obtains from the pseudo wire PDU of band Ethernet frame head, and further the pseudo wire PDU to band Ethernet frame head carries out flow control.

Message comprises that TDM examines only, straddle is transmitted the circuit simulation adapter head in head and the pseudo wire PDU between plate; This straddle is transmitted in the head and is packaged with routing iinformation, and first, second outgoing interface plate further utilizes the circuit simulation adapter head that carries in the message between plate that the clean nuclear of TDM is encapsulated as pseudo wire PDU;

Perhaps; Message comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with the circuit simulation adapter head in routing iinformation and the pseudo wire PDU, and the circuit simulation adapter head that first, second outgoing interface plate further utilizes straddle to transmit encapsulation in the head is encapsulated as pseudo wire PDU with the clean nuclear of TDM;

Perhaps; Message only comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted in the head and is packaged with routing iinformation, and first, second outgoing interface plate is further tabled look-up according to inner link layer and obtained can the clean nuclear of TDM being encapsulated as the circuit simulation adapter head of pseudo wire PDU.

Visible by technique scheme; The invention provides first cable card board with circuit emulation service function and second cable card board with ether transmission-receiving function; The clean consideration convey of TDM that utilizes reverse butt joint between two first cable card boards can realize that incoming interface and outgoing interface are traditional TDM business model of TDM interface is sent out; The clean consideration convey of TDM that utilizes first cable card board to be connected in series with order between second cable card board can to realize incoming interface and outgoing interface to be respectively the pseudo-circuit emulation business model of TDM interface and ether interface is sent out, thereby can merge traditional TDM business model and pseudo-circuit emulation business model based on the distributed frame of first cable card board and second cable card board.

Description of drawings

Fig. 1 a and Fig. 1 b are the existing model sketch map that is applied to the TDM device of digitize voice and Wide Area Network link;

Fig. 2 is the schematic diagram of existing TDM over IP/MPLS technology;

Fig. 3 is the sketch map of a kind of optional networking mode in the embodiment of the invention;

Fig. 4 is a kind of structural representation of data forwarding device in the embodiment of the invention;

Fig. 5 a is the flow chart of data processing figure of traditional TDM business model in the device as shown in Figure 4;

Fig. 5 b is the flow chart of data processing figure of TDM over IP/MPLS business model in the device as shown in Figure 4;

Fig. 6 is the another kind of structural representation of data forwarding device in the embodiment of the invention;

Fig. 7 a is the flow chart of data processing figure of traditional TDM business model in the device as shown in Figure 6;

Fig. 7 b is the flow chart of data processing figure of TDM over IP/MPLS business model in the device as shown in Figure 6;

Fig. 8 is the structural representation like the circuit emulation service unit in Fig. 4 and the device shown in Figure 6;

Fig. 9 is the structural representation of the business processing logic unit in the device as shown in Figure 6;

Figure 10 a is the flow chart of traditional TDM business model of data forwarding method in the embodiment of the invention;

Figure 10 b is the flow chart of the TDM over IP/MPLS business model of data forwarding method in the embodiment of the invention.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to further explain of the present invention.

Present embodiment provides first cable card board with circuit emulation service function and second cable card board with ether transmission-receiving function; Utilize reverse butt joint between two first cable card boards can realize that the clean consideration convey of TDM of traditional TDM business model of the TDM interface that incoming interface and outgoing interface are sends out; The clean consideration convey of TDM that utilizes first cable card board to be connected in series with order between second cable card board can to realize incoming interface and outgoing interface to be respectively the TDM over IP/MPLS business model of TDM interface and ether interface is sent out, thereby can merge traditional TDM business model and TDM over IP/MPLS business model based on the distributed frame of first cable card board and second cable card board.In other words, present embodiment can be regarded as the data forwarding that realizes the TDM business model based on the basic principle of TDMover IP/MPLS business model.

Below, be example with the E1/T1 Interface, earlier the data forwarding device that comprises above-mentioned first cable card board and second cable card board in the present embodiment is elaborated.

Fig. 3 is the sketch map of a kind of optional networking mode in the embodiment of the invention.Data as shown in Figure 3, that the data forwarding device in the present embodiment can receive through one of which side E1/T1 Interface, perhaps the E1/T1 Interface through opposite side is sent to circuit-switched network, or is sent to packet switching network through the ether interface of opposite side; Otherwise; Data forwarding device can also be received from the data that circuit-switched network or opposite side ether interface are received from packet switching network with the opposite side E1/T1 Interface; E1/T1 Interface from an aforementioned side sends again; Certainly, the E1/T1 Interface of an aforementioned side also can connection layout 3 in not shown other circuit-switched networks, or can connection layout 3 in unshowned TDM node with TDM processing capacity.

Fig. 4 is a kind of structural representation of data forwarding device in the embodiment of the invention.As shown in Figure 4, a kind of preferable data forwarding device comprises in the present embodiment:

At least two can be by E1/T1 Interface and the first mutual cable card board of circuit-switched network;

At least one can be passed through Ethernet interface and the second mutual cable card board of packet switching network;

Can realize the network board of mutual (to TDM over IP/MPLS business model) between mutual between first cable card board (to traditional TDM business model) and first cable card board and second cable card board.

Wherein, first cable card board both can be used as the incoming interface plate, also can be used as the outgoing interface plate, and it comprises circuit emulation service unit that connects E1/T1 Interface and the first message retransmission unit that connects network board; Second cable card board both can be used as the incoming interface plate, also can be used as the outgoing interface plate, and it comprises second message retransmission unit that connects network board and the Ethernet control unit that connects Ethernet interface.

In the practical application, the circuit emulation service unit can be realized by asic chip independently; The first message retransmission unit, the second message retransmission unit then can be transmitted the asic chip of handling for network processing unit, polycaryon processor or other realization network message, perhaps are carried on respectively in first cable card board and second cable card board and can move among the CPU of various application layer softwares; Too network control system unit then can be realized by existing ether controller.

Referring to Fig. 5 a and combine Fig. 4, send out for the clean consideration convey of TDM under traditional TDM business model:

In first cable card board as the incoming interface plate; The circuit emulation service unit is configured to the TDM business model; Can't as TDM over IP/MPLS business model, in the IP/MPLS network, set up the TDM tunnel under the traditional TDM business model; Therefore can't obtain required circuit simulation configuration parameter of circuit simulation adapter head and TDM parameters for tunnel, thereby the circuit emulation service unit is according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel; The clean nuclear of TDM that E1/T1 Interface is received from circuit-switched network or TDM node is encapsulated as the pseudo wire PDU of being with the Ethernet frame head; Certainly, as long as the message of encapsulation can be used any custom parameter encapsulation to obtain the self-defined message of arbitrary format by the identification of the first message retransmission unit; The first message retransmission unit is carried out and is searched route forwarding table; And various existing businesses such as traffic statistics, encryption and decryption, compressed and decompressed, service quality assurance are handled the back and from the pseudo wire PDU of band Ethernet frame head, are obtained new TDM and examine only alternatively; And the purpose plate that obtains number of will tabling look-up/destination address/information such as destination slogan are encapsulated into straddle and transmit in the head; Utilize straddle to transmit head then the clean nuclear of new TDM is encapsulated as message between plate, and message between this plate is sent to other first cable card boards as corresponding outgoing interface plate through network board;

In first cable card board as outgoing interface; The first message retransmission unit receives from as message between the plate of other first cable card boards of corresponding incoming interface plate and utilize aforementioned predefined self-defined circuit simulation configuration parameter and the clean nuclear of TDM that self-defined TDM parameters for tunnel obtains decapsulation in the message between slave plate is encapsulated as the pseudo wire PDU of band Ethernet frame head again through network board; Certainly, the message that obtains of encapsulation also can be the self-defined message that utilizes the packaged arbitrary format of other custom parameters that can be discerned by the circuit emulation service unit here; The decapsulation from the self-defined message of the pseudo wire PDU of band Ethernet frame head or aforementioned arbitrary format of aforementioned predefined self-defined circuit simulation configuration parameter of circuit emulation service unit by using and self-defined TDM parameters for tunnel obtains TDM and examines only, and the clean nuclear of TDM that again decapsulation is obtained is sent to circuit-switched network or TDM node through E1/T1 Interface (can via for example links such as E1/T1, E3/T3, CPOS, POS);

On the inverse direction of above-mentioned forward-path, as first cable card board of outgoing interface plate just become the incoming interface plate, as first cable card board of incoming interface plate just as the outgoing interface plate, but the principle of concrete handling process is constant.

Need to prove; Message only comprises that clean nuclear of TDM and straddle transmit head (this straddle is transmitted and be packaged with purpose plate that the first message retransmission unit finds number/destination address/routing iinformations such as destination slogan in the head in route forwarding table) and do not comprise the circuit simulation adapter head between the plate shown in Fig. 5 a, as the first message retransmission unit in first cable card board of outgoing interface plate can table look-up according to the link layer of inside (how to realize link layer is tabled look-up no longer give unnecessary details among the technology that is well known to those skilled in the art, this paper) obtain and can TDM be examined the circuit simulation adapter head that be encapsulated as pseudo wire PDU only.But; The form of message can be not limited thereto between plate; For example; Message can comprise that TDM examines only, above-mentioned straddle is transmitted the circuit simulation adapter head in head and the pseudo wire PDU between plate, thereby, can directly utilize the circuit simulation adapter head that carries in the message between plate that the clean nuclear of TDM is encapsulated as pseudo wire PDU as the first message retransmission unit in first cable card board of outgoing interface plate; Again for example; Message comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted and not only is packaged with above-mentioned routing iinformation in the head, also is packaged with circuit simulation adapter head in the pseudo wire PDU simultaneously; Thereby, the clean nuclear of TDM is encapsulated as pseudo wire PDU as the first message retransmission unit in first cable card board of outgoing interface plate, the circuit simulation adapter head that can directly utilize straddle to transmit encapsulation in the head.

Referring to Fig. 5 b and combine Fig. 4, send out for the clean consideration convey of TDM under the TDM over IP/MPLS business model:

In first cable card board as the incoming interface plate; The circuit emulation service unit is configured to TDM overIP/MPLS business model; (how setting up the TDM tunnel is technology known in the art because TDM over IP/MPLS business model can be set up the TDM tunnel in the IP/MPLS network; For example realize and issue and consult real circuits simulation configurations parameter and the true TDM parameters for tunnel obtain by the network management software by the network management software that carries among the CPU; Thereby no longer give unnecessary details herein); Thereby the circuit emulation service unit is received from E1/T1 Interface the clean pseudo wire PDU that is encapsulated as band Ethernet frame head of examining of TDM of circuit-switched network or TDM node according to real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel; First message retransmission unit decapsulation from the pseudo wire PDU of band Ethernet frame head (decapsulation comprise alternatively in handling various existing businesses such as traffic statistics, encryption and decryption, compressed and decompressed, service quality assurance handle) obtains new TDM and examines only; And will look into purpose plate that route forwarding table obtains number/destination address/information such as destination slogan and be encapsulated into straddle and transmit in the head; Utilize straddle to transmit head then the clean nuclear of new TDM is encapsulated as message between plate, and message between this plate is sent to second cable card board as corresponding outgoing interface plate by network board;

In second cable card board as the outgoing interface plate; The second message retransmission unit receives from as message between the plate of first cable card board of corresponding incoming interface plate through network board; And according to the real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel (the second message retransmission unit can obtain real circuits simulation configurations parameter with true TDM parameters for tunnel, repeat no more at this according to existing mode) TDM in the message between plate is examined only and to be encapsulated as the pseudo wire PDU of being with the Ethernet frame head, the Ethernet control unit will be sent to packet switching network with the pseudo wire PDU of Ethernet frame head through Ethernet interface (can via Ethernet link);

On the inverse direction of above-mentioned forward-path, second cable card board then as the outgoing interface plate, is promptly carried out the reverse process of above-mentioned forward-path as incoming interface plate, first cable card board;

In second cable card board as the incoming interface plate, the Ethernet control unit is forwarded to the second message retransmission unit with the pseudo wire PDU that Ethernet interface is received from the band Ethernet frame head of packet switching network; The second message retransmission unit will be encapsulated as message between plate with the clean nuclear of the TDM in the pseudo wire PDU of Ethernet frame head, and message between this plate is sent to first cable card board as corresponding outgoing interface plate through network board;

In first cable card board as outgoing interface; The first message retransmission unit receives from being encapsulated as the pseudo wire PDU of band Ethernet frame head as message between the plate of other first cable card boards of corresponding incoming interface plate or second cable card board and with the clean nuclear of the TDM in the message between plate through network board, and the clean nuclear of TDM that the circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head is sent to circuit-switched network or TDM node through E1/T1 Interface.

Need to prove; Message comprises that clean nuclear of TDM and straddle transmit the circuit simulation adapter head in head (this straddle is transmitted and be packaged with purpose plate that the first message retransmission unit finds number/destination address/routing iinformations such as destination slogan in the head in route forwarding table) and the pseudo wire PDU between the plate shown in Fig. 5 b, can directly utilize the circuit simulation adapter head that carries in the message between plate that TDM is examined only as the first message retransmission unit in first cable card board of outgoing interface plate and be encapsulated as pseudo wire PDU.But; The form of message can be not limited thereto between plate; For example; Message can only comprise clean nuclear of TDM and above-mentioned straddle forwarding head and not comprise the circuit simulation adapter head in the pseudo wire PDU between plate; Thereby, as the first message retransmission unit in first cable card board of outgoing interface plate can table look-up according to the link layer of inside (how to realize link layer is tabled look-up no longer give unnecessary details among the technology that is well known to those skilled in the art, this paper) obtain can the clean nuclear of TDM being encapsulated as the circuit simulation adapter head of pseudo wire PDU; Again for example; Message comprises clean nuclear of TDM and straddle forwarding head between plate; This straddle is transmitted and not only is packaged with above-mentioned routing iinformation in the head, also is packaged with circuit simulation adapter head in the pseudo wire PDU simultaneously; Thereby, the clean nuclear of TDM is encapsulated as pseudo wire PDU as the first message retransmission unit in first cable card board of outgoing interface plate, the circuit simulation adapter head that can directly utilize straddle to transmit encapsulation in the head.

As above visible, in the data forwarding device as shown in Figure 4, the data forwarding under the TDM business model is through mutual realization the between two first wiring boards; Data forwarding under the TDM over IP/MPLS business model then is through mutual realization the between one first wiring board and one second wiring board.

Fig. 6 is the another kind of structural representation of data forwarding device in the embodiment of the invention.Another kind of data forwarding device as shown in Figure 6 is than data forwarding device as shown in Figure 4; The main distinction is; No matter be as the incoming interface plate first cable card board, or, further comprise the business processing logic unit between its circuit emulation service unit and the first message retransmission unit as first cable card board of outgoing interface plate;

In first cable card board as the incoming interface plate:

The business processing logic unit is when being configured to the TDM business model together with the circuit emulation service unit; The pseudo wire PDU or the aforesaid extended formatting that are produced owing to the circuit emulation service unit all encapsulate to virtual channel; Thereby in order to share the first message retransmission unit decapsulation pseudo wire PDU or the required burden of aforesaid extended formatting message; Preferably can be by the business processing logic unit according to predefined circuit simulation configuration parameter and TDM parameters for tunnel, examine and be forwarded to the first message retransmission unit only from obtaining TDM from decapsulation the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit or the aforesaid extended formatting message;

The business processing logic unit is when being configured to TDM over IP/MPLS business model together with the circuit emulation service unit; Because the pseudo wire PDU that the circuit emulation service unit is produced is to real tunnel really; Thereby the pseudo wire PDU of business processing logic unit band Ethernet frame head that the circuit emulation service unit package is obtained directly transmits, is transparent transmission to the first message retransmission unit, and decapsulation from the pseudo wire PDU of being with the Ethernet frame head obtains TDM and examines only with the TDM parameters for tunnel according to the circuit simulation configuration parameter of consulting to obtain for the first message retransmission unit;

In first cable card board as the outgoing interface plate:

The business processing logic unit is when being configured to the TDM business model together with the circuit emulation service unit; According to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel; The clean nuclear of TDM that decapsulation in the message between the first message retransmission unit slave plate is obtained is encapsulated as the pseudo wire PDU of being with the Ethernet frame head; Promptly reduce the burden of first message retransmission unit place CPU; To be passed to the circuit emulation service unit with the pseudo wire PDU of Ethernet frame head then and carry out accurate flow control (as realizing agreement access rate algorithm, height priority scheduling algorithm etc.), in order to avoid data traffic surpasses E1/T1 port bandwidth or under-utilized to the E1/T1 port bandwidth; Certainly; The business processing logic unit that is configured to the TDM business model also can receive the first message retransmission unit and the TDM in the message between plate examined only the pseudo wire PDU that encapsulates the band Ethernet frame head that obtains according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel; Promptly the pseudo wire PDU with the Ethernet frame head is encapsulated by the first message retransmission unit, and the pseudo wire PDU that will be received from the band Ethernet frame head of the first message retransmission unit by the business processing logic unit that is configured to the TDM business model again is passed to the circuit emulation service unit and carries out flow control;

The business processing logic unit is when being configured to TDM over IP/MPLS business model together with the circuit emulation service unit; Receive the first message retransmission unit and the TDM in the message between plate is examined the pseudo wire PDU that encapsulates the band Ethernet frame head that obtains only, the pseudo wire PDU of being with the Ethernet frame head is passed to the circuit emulation service unit according to real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel; Certainly; The clean consideration convey of TDM that the first message retransmission unit also can directly obtain decapsulation in the message between plate is sent to the business processing logic unit that is configured to TDM over IP/MPLS business model, is encapsulated as the pseudo wire PDU of band Ethernet frame head and is passed to the circuit emulation service unit according to the clean nuclear of TDM that real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel will be received from the first message retransmission unit by this business processing logic unit again; In addition; Because the TDM business datum in the virtual channel of packet switching network can not surpass the E1/T1 port bandwidth with regard to long-term time accumulative total; Thereby alternatively, the business processing logic unit can not need carry out flow control to the pseudo wire PDU that is passed to the circuit emulation service unit when TDM over IP/MPLS business model.

Referring to Fig. 7 a and combine Fig. 6, send out for the clean consideration convey of TDM under traditional TDM business model:

In first cable card board as the incoming interface plate; The circuit emulation service unit is configured to the TDM business model; Can't as TDM over IP/MPLS business model, in the IP/MPLS network, set up the TDM tunnel under the traditional TDM business model; Therefore can't obtain required circuit simulation configuration parameter of circuit simulation adapter head and TDM parameters for tunnel, thereby the circuit emulation service unit is according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel; The clean nuclear of TDM that E1/T1 Interface is received from circuit-switched network or TDM node is encapsulated as the pseudo wire PDU of being with the Ethernet frame head; Certainly, as long as the message of encapsulation can be used any custom parameter encapsulation to obtain the self-defined message of arbitrary format by business processing logic unit and the identification of the first message retransmission unit; The pseudo wire PDU that receives at this moment owing to the business processing logic unit or the self-defined message of aforementioned arbitrary format are not that the relevant parameter according to true tunnel encapsulates; If thereby to carry out decapsulation by the first message retransmission unit also need be the aforementioned relevant parameter of configuration in the first message retransmission unit; Thereby, the first message retransmission unit can increase the burden of CPU when being carried on CPU; Based on this; By business processing logic unit predefined self-defined circuit simulation configuration parameter of foundation and self-defined TDM parameters for tunnel; The TDM that decapsulation is restored out from the self-defined message of the pseudo wire PDU of band Ethernet frame head or aforementioned arbitrary format examines only, and the clean nuclear of TDM is offered the first message retransmission unit, alternatively; If E1/T1 Interface is the channelizing E1/T1 Interface; Then the business processing logic unit can each time slot that decapsulation obtains the clean nuclear of time slot TDM be forwarded to the first message retransmission unit respectively, with further offloading the CPU when the first message retransmission unit is carried on CPU, and examine only for the non-time slot TDM of unchannelized E1/T1 Interface, then the first message retransmission unit is directly sent to the complete clean consideration convey of non-time slot TDM in the business processing logic unit; The first message retransmission unit is examined only each time slot of the clean nuclear of time slot TDM or complete non-time slot TDM alternatively and is carried out various existing businesses such as comprising traffic statistics, encryption and decryption, compressed and decompressed, service quality assurance and handle and obtain new TDM and examine only; And will look into purpose plate that route forwarding table obtains number/destination address/information such as destination slogan and be encapsulated into straddle and transmit in the head; Utilize straddle to transmit head then the clean nuclear of new TDM is encapsulated as message between plate, and message between this plate is sent to other first cable card boards as corresponding outgoing interface plate through network board;

In first cable card board as outgoing interface; The first message retransmission unit receives from examine (each time slot in clean nuclear of complete TDM or the clean nuclear of TDM) only as the TDM that decapsulation obtains in the message between message, slave plate between the plate of other first cable card boards of corresponding incoming interface plate through network board and offers business processing logic unit (the first message retransmission unit can be known the business processing logic unit arbitrarily and is in the TDM business model thereby only sends TDM to the business processing logic unit and examine only through existing); TDM is examined only (each time slot in clean nuclear of complete TDM or the clean nuclear of TDM) by aforementioned predefined self-defined circuit simulation configuration parameter of business processing logic unit by using and self-defined TDM parameters for tunnel and be encapsulated as the pseudo wire PDU of band Ethernet frame head or the self-defined message of aforementioned arbitrary format, and to the self-defined message traffic control of pseudo wire PDU or aforementioned arbitrary format; Certainly; Alternatively; The clean nuclear of TDM that the first message retransmission unit aforementioned predefined self-defined circuit simulation configuration parameter also capable of using and self-defined TDM parameters for tunnel obtain decapsulation in the message between slave plate is encapsulated as the pseudo wire PDU of band Ethernet frame head or the self-defined message that utilizes the packaged arbitrary format of other custom parameters that can be discerned by business processing logic unit and circuit emulation service unit again; By the business processing logic unit the self-defined message of pseudo wire PDU or aforementioned arbitrary format directly is forwarded to the circuit emulation service unit again, and to the self-defined message traffic control of pseudo wire PDU or aforementioned arbitrary format; Aforementioned predefined self-defined circuit simulation configuration parameter of circuit emulation service unit by using and self-defined TDM parameters for tunnel are from the pseudo wire PDU of band Ethernet frame head or obtain TDM according to decapsulation the self-defined message of the corresponding aforementioned arbitrary format of aforementioned arbitrary parameter and examine only, and the clean nuclear of TDM that again decapsulation is obtained is sent to circuit-switched network or TDM node through E1/T1 Interface (can via for example links such as E1/T1, E3/T3, CPOS, POS);

On the inverse direction of above-mentioned forward-path, as first cable card board of outgoing interface plate just become the incoming interface plate, as first cable card board of incoming interface plate just as the outgoing interface plate, but the principle of concrete handling process is constant.And, and between the plate among Fig. 5 a message in like manner, message also can be selected arbitrary format for use between the plate shown in Fig. 7 a.

Referring to Fig. 7 b and combine Fig. 6, send out for the clean consideration convey of TDM under the TDM over IP/MPLS business model:

In first cable card board as the incoming interface plate; The circuit emulation service unit is configured to TDM overIP/MPLS business model; (how setting up the TDM tunnel is technology known in the art because TDM over IP/MPLS business model can be set up the TDM tunnel in the IP/MPLS network; For example realize and issue and consult real circuits simulation configurations parameter and the true TDM parameters for tunnel obtain) by the network management software by the network management software that carries among the CPU; Thereby; The circuit emulation service unit is received from E1/T1 Interface the clean pseudo wire PDU that is encapsulated as band Ethernet frame head of examining of TDM of circuit-switched network or TDM node according to real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel; The pseudo wire PDU that receives at this moment owing to the business processing logic unit is that the relevant parameter according to true tunnel encapsulates; Promptly the first message retransmission unit can Direct Recognition; Therefore, the business processing logic unit directly will be forwarded to the first message retransmission unit with the pseudo wire PDU of Ethernet frame head; The first message retransmission unit is carried out and is searched route forwarding table; And various existing businesses such as traffic statistics, encryption and decryption, compressed and decompressed, service quality assurance are handled the back and from the pseudo wire PDU of band Ethernet frame head, are obtained new TDM and examine only alternatively; And the purpose plate that obtains number of will tabling look-up/destination address/information such as destination slogan are encapsulated into straddle and transmit in the head; Utilize straddle to transmit head then the clean nuclear of new TDM is encapsulated as message between plate, and message between this plate is sent to second cable card board as corresponding outgoing interface plate through network board;

In second cable card board as the outgoing interface plate; The second message retransmission unit receives from as message between the plate of first cable card board of corresponding incoming interface plate through network board; And the TDM in the message between plate is examined only with true TDM parameters for tunnel (the second message retransmission unit can obtain real circuits simulation configurations parameter and true TDM parameters for tunnel according to existing mode) according to the real circuits simulation configurations parameter of consulting to obtain and to be encapsulated as the pseudo wire PDU of being with the Ethernet frame head, the Ethernet control unit will be sent to packet switching network with the pseudo wire PDU of Ethernet frame head through Ethernet interface (can via Ethernet link);

In first cable card board as outgoing interface, the first message retransmission unit through network board receive from as message between the plate of second cable card board of corresponding incoming interface plate, and according to the real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel the TDM in the message between plate is examined only the pseudo wire PDU (the first message retransmission unit can be known the business processing logic unit arbitrarily and is in TDM over IP/MPLS business model thereby examines only to pseudo wire PDU but not TDM that the business processing logic unit sends band Ethernet frame head through existing) of the band Ethernet frame head that encapsulation obtains; The pseudo wire PDU that the business processing logic unit directly will be received from the band Ethernet frame head of the first message retransmission unit is passed to the circuit emulation service unit; Certainly; The clean consideration convey of TDM that the first message retransmission unit also can directly obtain decapsulation in the message between plate is sent to the business processing logic unit that is configured to TDM over IP/MPLS business model, is encapsulated as the pseudo wire PDU of band Ethernet frame head and is passed to the circuit emulation service unit according to the clean nuclear of TDM that real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel will be received from the first message retransmission unit by this business processing logic unit again; The circuit emulation service unit will decapsulation obtains from the pseudo wire PDU of band Ethernet frame head the clean nuclear of TDM be sent to circuit-switched network or TDM node through E1/T1 Interface.

Need to prove, and between the plate among Fig. 5 b message in like manner, message also can be selected arbitrary format for use between the plate shown in Fig. 7 b.

As above visible, data forwarding device as shown in Figure 6 and data forwarding device as shown in Figure 4 in like manner, the data forwarding under the TDM business model is through realizing alternately between two first wiring boards; Data forwarding under the TDM over IP/MPLS business model then is through mutual realization the between one first wiring board and one second wiring board.

In concrete the application; Above-mentioned network board shown in Fig. 4 and Fig. 6 can be selected any existing structure for use; And based on above-mentioned functional description; Various functional units in first cable card board and second cable card board also can be achieved according to any-mode by those skilled in the art; Below, to concrete implementation, enumerate an instance respectively and further detail like circuit emulation service unit in Fig. 4 and the device shown in Figure 6 and the business processing logic unit in the device as shown in Figure 6.

As shown in Figure 8; The circuit emulation service unit preferably can comprise: subelement is handled in protocol processes subelement, TDM interface subelement, shared storage administration and queue scheduling subelement, first Ethernet media interviews controls (MAC); And, extract subelement and first message to the TDM time slot of incoming interface direction and send subelement, receive subelement and TDM time slot allocation subelement to first message of outgoing interface direction;

When belonging to first cable card board in the circuit emulation service unit as the incoming interface plate; TDM interface subelement is decoded and Clock Extraction to the clean nuclear of TDM that the TDM interface receives (being received from circuit-switched network or TDM node for Fig. 4 and Fig. 6); The TDM time slot extracts subelement and from each the tdm data frame after decoding and the Clock Extraction, takes out effective time slot successively, share (promptly realizing little cache policy) in the external cache that storage administration and queue scheduling subelement be saved to effective time slot that takes out in each tdm data frame and signaling sequence the circuit emulation service unit and according to preset queue priority take out from external cache that effective time slot and signaling send to that the protocol engine subelement is encapsulated as the pseudo wire PDU of being with the Ethernet frame head after first message transmission subelement and first ethernet mac processing subelement send (for Fig. 4 be sent to the first message retransmission unit, then be to be sent to the business processing logic unit for Fig. 6);

When belonging to first cable card board in the circuit emulation service unit as the outgoing interface plate; Share storage administration and queue scheduling subelement will through first ethernet mac handle subelement and first message reception subelement receive (for Fig. 4 be received from the first message retransmission unit, then be to be received from the business processing logic unit for Fig. 6) the pseudo wire PDU of band Ethernet frame head be sent to the protocol processes subelement; The protocol processes subelement extracts effective tdm data and divides into groups, is saved in the external cache by shared storage administration and queue scheduling subelement and (promptly realizes little cache policy) from the pseudo wire PDU of band Ethernet frame head; TDM time slot allocation subelement reads the tdm data grouping and generates the tdm data frame from external cache through sharing storage administration and queue scheduling subelement, and TDM interface subelement sends (being sent to circuit-switched network or TDM node for Fig. 4 and Fig. 6) with clean the examining of the TDM that obtains from the TDM interface after the tdm data frame is carried out clock recovery and encodes.

Still referring to Fig. 8, for the ease of the pattern configurations of circuit emulation service unit, this circuit emulation service unit further comprises: configuration interface subelement, virtual channel tabulation subelement;

The configuration interface subelement issues indication circuit artificial service unit to the management control sub unit and is in any software that the configuration order, this configuration order of TDM business model or TDM over IP/MPLS business model carried in can be from CPU; And; In virtual channel tabulation subelement, predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel are set through sharing storage administration and queue scheduling subelement; This self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel can be from any softwares that carries among the CPU; This software that carries among the CPU also can read predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel in the virtual channel tabulation subelement via the configuration interface subelement and through sharing storage administration and queue scheduling subelement, so that know the current set self-defined circuit simulation configuration parameter and the occurrence of self-defined TDM parameters for tunnel;

And; When the TDM business model; Share self-defined circuit simulation configuration parameter and the self-defined TDM parameters for tunnel that storage administration and queue scheduling subelement tabulate virtual channel in the subelement and offer the protocol processes subelement, for the pseudo wire PDU that the protocol processes subelement encapsulates, decapsulation has the Ethernet frame head; When pseudo-circuit emulation business model; The configuration interface subelement issues the real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel (network management software that this parameter is carried in can be from CPU) through sharing storage administration and queue scheduling subelement to the protocol processes subelement, for the pseudo wire PDU that the protocol processes subelement encapsulates, decapsulation has the Ethernet frame head.

In addition; Also further has the management control sub unit in the circuit emulation service unit as shown in Figure 8; This management control sub unit be used for and the mutual various control signalings of other subelements (shown in the dotted line of Fig. 8) so that can collaborative work between other each subelements; Those skilled in the art can know concrete required control signaling based on the basic function of structure as shown in Figure 8 and circuit emulation service unit, thereby just give unnecessary details no longer one by one among this paper.

As shown in Figure 9; The business processing logic unit preferably can comprise: message processing and control sub unit, packet buffer subelement, second ethernet mac are handled subelement, system's packet interface subelement; And, to second message reception subelement and system's bag transmission subelement, the system's bag reception subelement that is directed against the outgoing interface direction and second message transmission subelement of incoming interface direction;

The business processing logic configuration of cells is that TDM business model and its are when belonging to first cable card board as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; Message handle with the predefined self-defined circuit simulation configuration parameter of control sub unit and self-defined TDM parameters for tunnel (this parameter network management software that can from CPU, carry through the interface of any setting be issued to message handle with control sub unit in store) from the pseudo wire PDU of band Ethernet frame head decapsulation obtain TDM and examine and be forwarded to system's bag only and send subelement, system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives is sent to the first message retransmission unit; Alternatively, for the channelizing E1/T1 Interface, the message processing can further obtain clean each time slot examined of TDM with decapsulation from the pseudo wire PDU of band Ethernet frame head with control sub unit and be forwarded to system's bag transmission subelement respectively;

The business processing logic configuration of cells is that TDM over IP/MPLS business model and its are when belonging to first cable card board as the incoming interface plate; Second message receives subelement and handles subelement through second ethernet mac and receive from the pseudo wire PDU of the band Ethernet frame head of circuit emulation service unit and be forwarded to message and handle and control sub unit; Message is handled pseudo wire PDU to the system bag transmission subelement with control sub unit transparent transmission band Ethernet frame head, and system's bag sends subelement and through system's packet interface subelement the clean consideration convey of the TDM that receives sent to the first message retransmission unit;

The business processing logic configuration of cells is that TDM over IP/MPLS business model and its are when belonging to first cable card board as the outgoing interface plate; The system bag receives subelement and receives from the pseudo wire PDU of the band Ethernet frame head of the first message retransmission unit and be forwarded to message through system's packet interface subelement and handle and control sub unit; Message is handled with control sub unit and is directly sent the pseudo wire PDU that subelement is transmitted band Ethernet frame head to second message, and second message sends subelement and handles subelement sends pseudo wire PDU from band Ethernet frame head to the circuit emulation service unit through second ethernet mac.

In the practical application, the system's packet interface in the business processing logic unit can have higher band width in physical and can produce the interface of effective back-pressure signal for SPI4.2 interface, POS-PHY interface, SGMII/XAUI interface, PCI Express interface etc.Like this; When message handle carry out Flow Control with control sub unit and cause the packet buffer subelement be in full state, in the time of maybe will expiring state; Can produce the back-pressure signal, the first message retransmission unit is stopped to clean nuclear of business processing logic unit output TDM or message to the first message retransmission unit through system's packet interface; And message is handled and control sub unit execution Flow Control also can be with reference to the back-pressure signal from the circuit emulation service unit; Thereby, can realize Flow Control in the plate, further can realize Flow Control between plate.As for how utilizing the back-pressure signal to realize in the plate Flow Control between Flow Control and plate, those skilled in the art can realize that this paper no longer gives unnecessary details with reference to existing any-mode.

More than; Only be to be the explanation that example is carried out with the E1/T1 Interface; And for the TDM interface of other types such as for example E3/T3; The structure of the above-mentioned data forwarding device and first cable card board thereof and second cable card board is identical with basic functional principle essence, thereby just no longer enumerates one by one to the TDM interface of other types among this paper.

Below, again the data forwarding method that provides in the present embodiment is elaborated.

Data forwarding method in the present embodiment comprises on Way in:

Data forwarding method in the present embodiment comprises on Way out:

And according to the business model branch, said method has different handling processes to traditional TDM business model again with TDM overIP/MPLS business model.

Figure 10 a is the flow chart of traditional TDM business model of data forwarding method in the embodiment of the invention.Shown in Figure 10 a, under traditional TDM business model:

Step 1001a; The clean nuclear of TDM that the first incoming interface plate utilizes simulation technology that its time division multiplexing tdm interface is received is encapsulated as the pseudo wire PDU of band Ethernet frame head, again will the clean nuclear of the TDM of band in the pseudo wire PDU of Ethernet frame head be encapsulated as message between plate and be sent to the first outgoing interface plate of correspondence through network board;

In this step, the first incoming interface plate utilizes simulation technology, and further according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel the clean nuclear of TDM is encapsulated as the pseudo wire PDU of the band Ethernet frame head of the corresponding first outgoing interface plate;

Step 1002a; The first outgoing interface plate receives from message between the plate of the corresponding first incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board and is encapsulated as the pseudo wire PDU of being with the Ethernet frame head, utilizes the simulation technology TDM that decapsulation obtains from the pseudo wire PDU of band Ethernet frame head to examine only and send through the TDM interface again;

In this step, the first outgoing interface plate utilizes simulation technology, also further examines only according to predefined self-defined circuit simulation configuration parameter and self-defined TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head;

Further alternatively, in this step, the first outgoing interface plate can be before utilizing the clean nuclear of the simulation technology TDM that decapsulation obtains from the pseudo wire PDU of band Ethernet frame head, and further the pseudo wire PDU to band Ethernet frame head carries out flow control.

So far, a data forwarding flow process under traditional TDM business model finishes.

Behind the role reversal of the first incoming interface plate and the first outgoing interface plate, still according to above-mentioned flow performing.

Figure 10 b is the flow chart of the TDM over IP/MPLS business model of data forwarding method in the embodiment of the invention.Shown in Figure 10 b, under TDM over IP/MPLS business model:

Step 1001b; The clean nuclear of TDM that the first incoming interface plate utilizes simulation technology that its time division multiplexing tdm interface is received is encapsulated as the pseudo wire PDU of band Ethernet frame head, again will the clean nuclear of the TDM of band in the pseudo wire PDU of Ethernet frame head be encapsulated as message between plate and be sent to the second outgoing interface plate of correspondence through network board;

In this step, the first incoming interface plate utilizes simulation technology, and the real circuits simulation configurations parameter of further consulting to obtain and the true TDM parameters for tunnel pseudo wire PDU that the clean nuclear of TDM is encapsulated as the band Ethernet frame head of the corresponding second outgoing interface plate;

Step 1002b, the second outgoing interface plate send through its Ethernet interface after receiving the pseudo wire PDU that is encapsulated as band Ethernet frame head from message between the plate of the corresponding first incoming interface plate and with the clean nuclear of the TDM in the message between plate through network board;

In this step, the second outgoing interface plate utilizes simulation technology, also further examines only according to the real circuits simulation configurations parameter of consulting to obtain and true TDM parameters for tunnel decapsulation TDM from the pseudo wire PDU of band Ethernet frame head.

So far, a data forwarding flow process under the TDM over IP/MPLS business model finishes.

When the first incoming interface plate becomes the outgoing interface plate, when the second outgoing interface plate becomes the incoming interface plate, oppositely carries out above-mentioned flow process.

And message between the above-mentioned plate of shown in Figure 10 a and Figure 10 b, mentioning in the flow process, its form can be referring to message between the mentioned plate of aforementioned data retransmission unit part.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. data forwarding device; It is characterized in that this device comprises: at least two first cable card boards, at least one second cable card board with Ethernet interface with TDM interface; And, can realize between first cable card board, mutual network board between first cable card board and second cable card board;

2. data forwarding device as claimed in claim 1 is characterized in that,

3. data forwarding device as claimed in claim 1; It is characterized in that; The circuit emulation service unit comprises: protocol processes subelement, TDM interface subelement, shared storage administration and queue scheduling subelement, first ethernet mac are handled subelement; And the TDM time slot extracts subelement and TDM time slot allocation subelement, first message send subelement and first message receives subelement;

4. data forwarding device as claimed in claim 3 is characterized in that, the circuit emulation service unit further comprises: configuration interface subelement, virtual channel tabulation subelement;

5. like each described data forwarding device in the claim 1 to 4, it is characterized in that,

6. data forwarding device; It is characterized in that this device comprises: at least two first cable card boards, at least one second cable card board with Ethernet interface with TDM interface; And, can realize between first cable card board, mutual network board between first cable card board and second cable card board;

7. data forwarding device as claimed in claim 6 is characterized in that,

8. data forwarding device as claimed in claim 7 is characterized in that, the TDM interface is a channelizing TDM interface;

9. data forwarding device as claimed in claim 7; It is characterized in that; The business processing logic unit comprises: message processing and control sub unit, packet buffer subelement, second ethernet mac are handled subelement, system's packet interface subelement; And system's bag receives subelement and system's bag sends subelement, second message receives subelement and second message sends subelement;

10. data forwarding device as claimed in claim 9 is characterized in that, the TDM interface is a channelizing TDM interface;

11. like each described data forwarding device in the claim 6 to 10, it is characterized in that,

12. a cable card board is characterized in that, this cable card board has the time division multiplexing tdm interface and comprises the circuit emulation service unit and the first message retransmission unit;

13. cable card board as claimed in claim 12 is characterized in that,

14. cable card board as claimed in claim 12; It is characterized in that; The circuit emulation service unit comprises: protocol processes subelement, TDM interface subelement, shared storage administration and queue scheduling subelement, first ethernet mac are handled subelement; And the TDM time slot extracts subelement and TDM time slot allocation subelement, first message send subelement and first message receives subelement;

15. cable card board as claimed in claim 14 is characterized in that, the circuit emulation service unit further comprises: configuration interface subelement, virtual channel tabulation subelement;

16. like each described cable card board in the claim 12 to 15, it is characterized in that,

17. a cable card board is characterized in that, this cable card board has the time division multiplexing tdm interface, and comprises: the business processing logic unit between the circuit emulation service unit and the first message retransmission unit and circuit emulation service unit and the first message retransmission unit;

18. cable card board as claimed in claim 17 is characterized in that,

19. cable card board as claimed in claim 18 is characterized in that, the TDM interface is a channelizing TDM interface;

20. cable card board as claimed in claim 18; It is characterized in that; The business processing logic unit comprises: message processing and control sub unit, packet buffer subelement, second ethernet mac are handled subelement, system's packet interface subelement; And system's bag receives subelement and system's bag sends subelement, second message receives subelement and second message sends subelement;

21. cable card board as claimed in claim 20 is characterized in that, the TDM interface is a channelizing TDM interface;

22. like each described cable card board in the claim 17 to 21, it is characterized in that,

23. a data forwarding method is characterized in that,

On Way in, this method comprises:

On Way out, this method comprises:

24. data forwarding method as claimed in claim 23 is characterized in that, in the method:

25. data forwarding method as claimed in claim 23; It is characterized in that; On Way out; This method further comprises: the first outgoing interface plate is before utilizing the clean nuclear of the simulation technology TDM that decapsulation obtains from the pseudo wire PDU of band Ethernet frame head, and further the pseudo wire PDU to band Ethernet frame head carries out flow control.

26. like each described data forwarding method in the claim 23 to 25, it is characterized in that,