CN101014007A

CN101014007A - Data transmission method and transmitting apparatus and receiving apparatus

Info

Publication number: CN101014007A
Application number: CNA2007100031419A
Authority: CN
Inventors: 汤成; 王临春
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-01-31
Filing date: 2007-01-31
Publication date: 2007-08-08
Anticipated expiration: 2027-01-31
Also published as: CN100583826C

Abstract

The invention discloses one data transmission method for communication between business card and network, which comprises the following steps: a, send end is sealed with agreement type label and first business information of first data pack and outputting the said data pack; b, receive end analyzes the first data pack of first business information content according to the agreement type label. The invention also discloses one send device and receive device.

Description

Data transmission method and dispensing device and receiving system

Technical field

The present invention relates to communication technical field, particularly data transmission method, dispensing device and receiving system.

Background technology

Common router traffic stream is mainly realized by service card and network processing unit NP, the physical layer data that the main process user interface of service card is come, form with packet after handling sends to NP, and NP resolves packet content, transmits accordingly then.Usually, service card to the different agreement type, and dissimilar interfaces is arranged between NP, commonly used has: based on the bag coffret POS of synchronous digital hierarchy SDH/ synchronous optical network Sonet, serial medium independent transmission interface SMII, gigabit medium independent transmission interface GMII, these interfaces can use parallel interface, by backboard and NP interconnection, and use field programmable logic FPGA to realize the adaptive of interface, service card is connected with FPGA0, NP is connected with FPGA1, FPGA0 and FPGA1 are inserted on the backboard by the connector on the backboard respectively, and its interface connects as shown in Figure 1.

In the prior art, transmit the data of different agreement, as change the service card of different agreement type, two kinds of solutions are arranged, a kind ofly be: all need to redefine the parallel data agreement between FPGA0 and the FPGA1 when changing protocol type at every turn, again download to be suitable for selected agreement, process is very complicated, causes fault easily; Another kind is: adopt identical interface protocol pattern between FPGA0 and FPGA1, it is self-defined a kind of protocol mode, the form of the message of different agreement type being made this protocol mode regulation transmits, promptly data are packed in the service card side, buffer memory sends data then, has under the situation of a plurality of physics sub-interfaces for a service card, can need bigger spatial cache and complicated data upload arbitration, also cause fault easily; Under the situation of using the parallel data cabling to transmit, use SMII to need 20 lines, use GMII to need 22 lines, use POS to need 24 lines at least, packet with a service card is transferred to a plurality of NP simultaneously if desired, perhaps selects different NP to transmit the packet of a service card, then is equivalent to connect a plurality of parallel interfaces, huge the increasing of line that need pass backboard this moment is difficult in the practical application realize; Use separately the state information of a plurality of user ports of single line multiplexing transmission, occur mistake easily, be unfavorable for that the opposite end correctly extracts the state information of user port.

Summary of the invention

The technical problem that the embodiment of the invention will solve provides a kind of data transmission method, dispensing device and receiving system, reaches the purpose that can transmit the different agreement data.

For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:

A kind of data transmission method is used for service card and communicates by letter with the network processes side, comprising:

First packet of A, transmitting terminal packaging belt protocols having type identification and first business information, and export first packet;

B, receiving terminal go out the first business information content that first packet carries according to the protocol type identification (RNC-ID) analytic.

A kind of dispensing device comprises:

First encapsulation unit is used to encapsulate first packet, and first packet comprises: the protocol type sign and first business information;

First transmitting element is used to send first packet.

A kind of receiving system comprises:

Protocol type obtains the unit, is used for obtaining the protocol type sign from first packet that receives;

Resolution unit is used for the first business information content of carrying according to protocol type identification (RNC-ID) analytic first packet.

Above technical scheme as can be seen, the embodiment of the invention adopts transmitting terminal to encapsulate first packet and output, this first packet comprises: the protocol type sign and first business information, receiving terminal goes out the first business information content according to the protocol type identification (RNC-ID) analytic, realize communicating by letter between service card and the network processes side, reach the purpose that to transmit the different agreement data.

Description of drawings

Service card that Fig. 1 provides for prior art and the interface connection layout between the NP;

Use the interface structure figure of SERDES between service card that Fig. 2 is provided for embodiments of the invention one and the NP;

The data transmission method flow chart that Fig. 3 is provided for embodiments of the invention one;

The insertion control information flow process figure that Fig. 4 is provided for embodiments of the invention one;

The extraction control information flow process figure that Fig. 5 is provided for embodiments of the invention one;

The dispensing device structure chart that Fig. 6 is provided for embodiments of the invention two;

The receiving system structure chart that Fig. 7 is provided for embodiments of the invention three.

Embodiment

Following with reference to accompanying drawing, the technical scheme of the embodiment of the invention is elaborated.

The embodiment of the invention one links to each other by high-speed serial data transmission SERDES between the interface FPGA1 of the interface FPGA0 of service card and NP, its interface structure as shown in Figure 2, carrying corresponding business data on SERDES, and in conjunction with Fig. 3, the data transmission method that the embodiment of the invention one is provided comprises:

Step 301, the first parallel organization unit are according to the protocol type configuration protocol type identification under the data waiting for transmission, and obtain this agreement predetermined data form, dispose first business information according to this agreement predetermined data form and data content waiting for transmission, encapsulation comprises first packet of the protocol type sign and first business information, is that frequency sends first packet with the last row clock of agreement;

Wherein, the work clock of POS agreement is 100M, and promptly the last row clock of POS agreement is 100M; The work clock of SMII agreement is 125M, and promptly the last row clock of SMII agreement is 125M; The work clock of GMII agreement is 125M, and promptly the last row clock of GMII agreement is 125M; According to the difference of agreement, the form difference of first packet, the encapsulation format that can use the GMII protocol data as shown in Table 1 and Table 2:

15	14	13	12	11	10	9	8	7-0
15	14	13	12	11	10	9	8	7-0	0	1	0	1	0	1	Rx_Err	Rx_Dv	Rx_Data[7:0]

The data format of table 1, GMII RX

15	14	13	12	11	10	9	8	7-0
15	14	13	12	11	10	9	8	7-0	0	1	0	1	0	1	Tx_Err	Tx_En	Tx_Data[7:0]

The data format of table 2, GMII TX

Wherein, the data message error indication signal of the Rx_Err in the table 1 for receiving; Rx_Dv is for receiving the data useful signal; Rx_Data[7:0] be the parallel data that receives; The data message error indication signal of Tx_Err in the table 2 for sending; Tx_En is for sending the data useful signal; Tx_Data[7:0] be the parallel data that sends;

The encapsulation format that can use the SMII protocol data is shown in table 3 and table 4:

15	14	13	12	11	10	9-0
15	14	13	12	11	10	9-0	0	0	1	0	1	Sync	Rx_Data[9:0]

The data format of table 3, SMII RX

15

14

13

12

11

10

9-0

0

1

0

1

Sync

Tx_Data[9:0]

The data format of table 4, SMII TX

Wherein, the Sync in the table 3 is a synchronizing signal; Rx_Data[9:0] be the parallel data of reception, each represents a serial data, corresponding one tunnel quick ether data-signal; Sync in the table 4 is a synchronizing signal, Tx_Data[9:0] be the parallel data of transmission, each represents a serial data, corresponding one tunnel quick ether data-signal;

The encapsulation format that can use the POP protocol data is shown in table 5 and table 6::

15	14	13	12	11	10	8	7-0
15	14	13	12	11	10	8	7-0	1	0	1	0	RxEop	RxADDr[1:0]	RxVAL	Rx_Data[7:0]

The data format of table 5, POP RX

15	14	13	12	11	10	8	7-0
15	14	13	12	11	10	8	7-0	1	0	1	0	TxEop	TxADDr[1:0]	TxEn	Tx_Data[7:0]

The data format of table 6, POP TX

Wherein, RxEop is a receiving data packets bag tail index signal in the table 5; RxADDr[1:0] be the port index signal of receiving terminal, RxVAL is for receiving the data useful signal; Rx_Data[7:0] be the parallel data that receives; TxEop is the bag tail index signal that sends datagram in the table 6; TxADDr[1:0] be the port index signal of transmitting terminal; TxEn is for sending the data useful signal; Tx_Data[7:0] be the parallel data that sends;

Wherein, the 15-12 position in the encapsulation format can be used for the protocol type sign, is used to identify different protocol types; The 9-0 position is as the first business information content in the GMII protocol data form; The 10-0 position is as the first business information content in the SMII protocol data form; The 11-0 position is as the first business information content in the POP protocol data form; For different agreements, fill by 0 and 1 separately mode no position in the data format, helps the clock recovery of SERDES interface, improves the reliability of link;

Step 302, the first clock zone switch unit are according to the last row clock of agreement, with clock frequency to be converted, it is the local clock frequency, carrying out clock zone switches, with the last row clock with agreement that receives is that first packet that frequency is exported deposits first in first out buffer area FIFO in, wherein, the local clock frequency can be 156.25M;

Whether unit judges FIFO is inserted in step 303, control information is empty, if output has the control information of specific character, if not, exporting first packet, is that frequency is exported the data flow that first packet and control information interleave with the local clock of SERDES promptly; Control information comprises: the recovery status information of the SERDES clock of K28.2+ flow-control information or K28.5+ opposite end;

Step 304, first converting unit are carried out the conversion of 8B/10B with data flow, and the data transaction that is about to 16 becomes 20, serial output again, and with the frequency transmission serial data of 20 times 156.25M, this moment, the transmission frequency of serial data was 3.125G;

Step 305, second converting unit convert the serial data that receives to 20 parallel data, use the 10B/8B switch technology 20 parallel data to be converted to 16 parallel data, being reduced into former data flow, is that frequency sends this data flow with the local clock of SERDES;

Step 306, control information extraction unit extract control information and output from former data flow, deposit first packet in FIFO;

Step 307, second clock territory switch unit be according to local clock frequency and clock frequency to be converted, and promptly the last row clock of the agreement of Jie Shouing carries out clock zone and switches, and is first packet of storing among the frequency transmission FIFO with the last row clock of agreement;

Step 308, the second parallel organization unit extract the protocol type sign from first packet, go out the first business information content according to the protocol type identification (RNC-ID) analytic;

The receiving terminal that connects NP will send the data and the service card full-duplex communication of NP side, and this method also comprises:

The protocol type that step 309, clock selecting unit basis parse identifies the following row clock of selecting agreement from the clock of the last row clock of agreement and NP side;

For POS agreement and SMII agreement, selecting the last row clock of agreement is the following row clock of agreement, has avoided adopting the error of the frequency of homology clock zone not and has adopted the not caused data processing problem of homology clock; For the GMII agreement, selecting the clock of NP side is the following row clock of agreement;

Step 310, being packaged into second packet with protocol type with from second business information of NP side, is that frequency sends second packet with the following row clock of agreement.

Wherein, the data stream format of control information insertion unit output can be as shown in table 7 in the step 303:

data

K+Link

K+Pfa

K+Link

K+Pfa

data

Data stream format after table 7, the insertion control information

Step 303 specific implementation may further comprise the steps:

Step 401, judge whether it is to reset or/and the SERDES clock recovery of local reception end is unusual, if, promptly reset or/and the SERDES clock recovery of local reception end is unusual, repeated execution of steps 401, if not, execution in step 402;

When initialization, this step sends the K character continuously and is used for receiving terminal and carries out the 156.25M clock recovery;

Step 402, judge that whether FIFO is empty, if, execution in step 403, if not, execution in step 406;

Step 403, judge whether to send flow-control information, if, execution in step 404, if not, execution in step 405;

Step 404, transmission K28.2+Pfa, Pfa is a flow-control information, and wherein, K28.2 accounts for most-significant byte, and Pfa accounts for least-significant byte, the treatment state of the user port that expression is connected with control information insertion unit, process ends;

Step 405, transmission K28.5+Link, wherein, K28.5 accounts for most-significant byte, and Link accounts for least-significant byte, the SERDES clock recovery state of expression local reception end, process ends;

Step 406, transmission first packet.

Wherein, step 306 specifically may further comprise the steps:

Whether step 501, detection receive that the K character and/or the data decode of predetermined quantity are normal, if not, promptly do not receive the K character and/or the data decode mistake of predetermined quantity, repeated execution of steps 501, if think follow-up be normal data flow, execution in step 502;

Whether the most-significant byte of the packet that step 502, judgement receive is K28.2, if, execution in step 503, if not, execution in step 504;

The least-significant byte of step 503, extraction packet, least-significant byte Pfa is a flow-control information, process ends;

Whether the most-significant byte of the packet that step 504, judgement receive is K28.5, if, execution in step 505, if not, execution in step 506;

The least-significant byte of step 505, extraction packet, least-significant byte Link is the SERDES clock recovery state information of transmitting terminal, process ends;

Step 506, deposit first packet in FIFO.

Consult Fig. 6, embodiments of the invention two provide a kind of dispensing device, comprising:

Type configuration unit 601 is used for according to the protocol type configuration protocol type identification under the data waiting for transmission, and wherein, protocol type is the POS agreement, SMII agreement or GMII agreement;

Business information dispensing unit 602 is used for obtaining agreement predetermined data form according to the protocol type under the data waiting for transmission, disposes first business information according to agreement predetermined data form and data content waiting for transmission;

First encapsulation unit 603 is used to encapsulate first packet, and first packet comprises: from the protocol type of type configuration unit 601 sign with from first business information of business information dispensing unit 602;

First transmitting element 604, the last row clock that is used for agreement is that frequency is sent first packet from first encapsulation unit 603;

Clock transfer unit 605 is used for the last row clock of output protocol;

The first clock zone switch unit 606, be used for the last row clock of basis from the agreement of clock transfer unit 605, carrying out clock zone with clock frequency to be converted switches, clock frequency to be converted is the local clock frequency, can be 156.25M, will deposit the first in first out buffer area in from first packet of first transmitting element 604;

Unit 607 is inserted in control information, is used to judge whether the first in first out buffer area is empty, if the output control information if not, is exported first packet.

Consult Fig. 7, embodiments of the invention three provide a kind of receiving system, comprising:

Data Receiving unit 701 is used to receive the data flow that first packet and control information interleave;

Control information extraction unit 702 is used for extracting control information from the data flow of Data Receiving unit 701, and first packet is preserved;

Clock receiving element 703 is used to receive the last row clock of agreement;

Second clock territory switch unit 704, the last row clock that is used for clock receiving element 703 agreements is a frequency, first packet in the control information extraction unit 702 is outputed to protocol type obtain unit 705;

Protocol type obtains unit 705, is used for obtaining the protocol type sign from first packet that receives;

Resolution unit 706 is used for the first business information content of carrying according to protocol type identification (RNC-ID) analytic first packet that obtains unit 705 from protocol type;

Clock selecting unit 707 is used for selecting the following row clock of agreement on the agreement in coming self-clock receiving element 703 between row clock and the network processes side clock according to the protocol type sign that obtains unit 705 from protocol type;

Second encapsulation unit 708 is used to encapsulate second packet, and second packet comprises: the protocol type sign and second business information that obtain unit 705 from protocol type;

Second transmitting element 709, the following row clock of self-clock selected cell 707 agreements is that frequency is sent second packet from second encapsulation unit 708 since being used for.

Embodiments of the invention encapsulate first packet and output by adopting first parallel organization, this first packet comprises: the protocol type sign and first business information, second parallel organization goes out the first business information content according to the protocol type identification (RNC-ID) analytic, realize communicating by letter between service card and the network processes side, reach the purpose that to transmit the different agreement data; The technical scheme of three kinds of agreements of support that embodiments of the invention provided needs cabling to be: send two lines of serial data needs, receiving serial data needs two lines, the up clock line of agreement, the descending clock line of agreement, six roots of sensation line altogether; When the packet of a service card being transferred to a plurality of NP simultaneously, when perhaps selecting different NP to transmit the packet of a service card, the line that need pass backboard is less, is easy to realize; The embodiment of the invention is embedded into flow-control information pfa in the data flow to be transmitted, and helps the correct extraction of flow-control information, notifies the treatment state of opposite end local user's port immediately.

More than a kind of data transmission method that the embodiment of the invention provided and dispensing device and receiving system are described in detail, used specific case herein the principle and the execution mode of the embodiment of the invention are set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the thought of the embodiment of the invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the embodiment of the invention.

Claims

1, a kind of data transmission method is used for service card and communicates by letter with the network processes side, it is characterized in that, comprising:

First packet of A, transmitting terminal packaging belt protocols having type identification and first business information, and export described first packet;

B, receiving terminal go out the described first business information content that described first packet carries according to described protocol type identification (RNC-ID) analytic.

2, method according to claim 1 is characterized in that, before first packet of the transmitting terminal packaging belt protocols having type identification and first business information, this method also comprises:

Dispose described protocol type sign according to the protocol type under the data waiting for transmission.

3, method according to claim 1 and 2 is characterized in that, before first packet of the transmitting terminal packaging belt protocols having type identification and first business information, this method also comprises:

Obtain described agreement predetermined data form according to the protocol type under the data waiting for transmission, dispose described first business information according to described agreement predetermined data form and data content waiting for transmission.

4, method according to claim 3 when data waiting for transmission belong to gigabit medium independent transmission interface type, is characterized in that:

Described first business information comprises: send the data useful signal, the parallel data of transmission.

5, method according to claim 3 when data waiting for transmission belong to serial medium independent transmission interface type, is characterized in that:

Described first business information comprises: synchronizing signal, the parallel data of transmission.

6, method according to claim 3 when data waiting for transmission belong to coffret type based on synchronous digital hierarchy/synchronous optical network, is characterized in that:

Described first business information comprises: the bag tail index signal that sends datagram, the port index signal of transmitting terminal sends the data useful signal, the parallel data of transmission.

7, method according to claim 3 is characterized in that:

Described first packet of described output is specially: the last row clock with described agreement is that frequency is exported described first packet;

Before the step B, this method also comprises:

According to the last row clock of described agreement and clock frequency to be converted, carry out clock zone and switch, be that described first packet that frequency is exported deposits the first in first out buffer area in the last row clock that receives with described agreement; Judge whether described first in first out buffer area is empty, if the output control information if not, is exported described first packet;

Receiving terminal receives the data flow that described first packet and described control information interleave, and extracts described control information.

8, method according to claim 7 is characterized in that, this method also comprises:

Transmitting terminal is exported the last row clock of described agreement;

Receiving terminal is identified at the following row clock of selecting described agreement between the last row clock of described agreement and network processes side clock according to described protocol type;

Packaging belt has second packet of the described protocol type sign and second business information;

Following row clock with described agreement is that frequency sends described second packet.

9, method according to claim 8 when described protocol type is a serial medium independent transmission interface type or during based on the coffret type of synchronous digital hierarchy/synchronous optical network, is characterized in that:

Select the following row clock of described agreement to be specially between row clock on the described agreement and network processes side clock: the last row clock of selecting described agreement is the following row clock of described agreement.

10, method according to claim 8 when described protocol type is gigabit medium independent transmission interface type, is characterized in that:

Selecting the following row clock of described agreement to be specially between row clock on the described agreement and the network processes side clock: to select to be the following row clock of described agreement between described network processes side clock.

11, a kind of dispensing device is characterized in that, comprising:

First encapsulation unit is used to encapsulate first packet, and described first packet comprises: the protocol type sign and first business information;

First transmitting element is used to send described first packet.

12, device according to claim 11 is characterized in that, described device also comprises:

The type configuration unit is used for disposing described protocol type sign according to the protocol type under the data waiting for transmission.

13, according to claim 11 or 12 described devices, it is characterized in that described device also comprises:

The business information dispensing unit is used for obtaining described agreement predetermined data form according to the protocol type under the data waiting for transmission, disposes described first business information according to described agreement predetermined data form and data content waiting for transmission.

14, device according to claim 13 is characterized in that:

Described first transmitting element, the last row clock that is used for described agreement is that frequency sends described first packet;

Described device also comprises:

The clock transfer unit is used to export the last row clock of described agreement;

The first clock zone switch unit is used for basis from the last row clock of the described agreement of described clock transfer unit and clock frequency to be converted, carries out clock zone and switches, and will deposit the first in first out buffer area in from described first packet of described first transmitting element;

The unit is inserted in control information, is used to judge whether described first in first out buffer area is empty, if the output control information if not, is exported described first packet.

15, a kind of receiving system is characterized in that, comprising:

Resolution unit is used for the first business information content of carrying according to described first packet of described protocol type identification (RNC-ID) analytic.

16, device according to claim 15 is characterized in that, described device also comprises:

The clock receiving element is used to receive the last row clock of agreement;

The clock selecting unit is used for selecting the following row clock of described agreement according to the described protocol type sign that obtains the unit from protocol type between row clock on the described agreement and network processes side clock;

Second encapsulation unit is used to encapsulate second packet, and described second packet comprises: the described protocol type sign and second business information that obtain the unit from protocol type;

Second transmitting element, the following row clock that is used for described agreement is that frequency sends described second packet.

17, device according to claim 16 is characterized in that, described device also comprises:

The Data Receiving unit is used to receive the data flow that first packet and control information interleave;

The control information extraction unit is used for extracting described control information from described data flow, and described first packet is preserved;

Second clock territory switch unit, the last row clock that is used for the described agreement of described clock receiving element is a frequency, described first packet of described control information extraction unit is outputed to described protocol type obtain the unit.