CN100499406C - Information transmission equipment, method and system - Google Patents
Information transmission equipment, method and system Download PDFInfo
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- CN100499406C CN100499406C CNB2004100710100A CN200410071010A CN100499406C CN 100499406 C CN100499406 C CN 100499406C CN B2004100710100 A CNB2004100710100 A CN B2004100710100A CN 200410071010 A CN200410071010 A CN 200410071010A CN 100499406 C CN100499406 C CN 100499406C
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Abstract
The invention is in use for transferring monitored information mainly between net elements of optical network. The information transferring equipment includes first asynchronous processing element, second asynchronous processing element, first overhead processing element and second overhead processing element. Through the first asynchronous processing element and the second asynchronous processing element, the information transferring equipment transfers message in asynchronization so as to realize communication between net elements. Moreover, the invention also discloses relevant information transfer method and system the invention avoids a series of problems brought by synchronous mode such as penetration of time clock tracking.
Description
Technical field
The present invention relates to the optical communication technique field, in particular, the present invention relates to information transmission equipment, the method and system of communicating by letter between the realization network element in a kind of optical-fiber network.
Background technology
At present, the Fibre Optical Communication Technology development is very fast, with wavelength division multiplexing (WDM, Wavelength DivisionMultiplexing) technology has become the developing direction of following high speed transmission network for the Optical Transmission Network OTN with add drop multiplex function and cross connect function on basis has the reconstruct of being easy to, good huge advantage such as autgmentability.The application of described WDM technology is to adopt the available band with optical fiber to be divided into several little channels, and the corresponding wavelength of each channel makes single wavelength transmission become multi-wavelength and transmits simultaneously, thereby increases the transmission capacity of optical fiber greatly.For example, if the transmission rate of each wavelength is 10Gb/s, use 160 wavelength simultaneously in an optical fiber, then the total transmission capacity of optical fiber can reach 10 * 160=1600Gb/s.
The canonical system that WDM technology realizes in Optical Transmission Network OTN is made up of optical multiplexer (optical multiplexer), image intensifer and the optical branching filter (optical demultiplexer) that can extract the independent light wavelength.The optical sender of transmitting terminal sends the light signal that optical wavelength difference and precision and stability can meet certain requirements, through optical multiplexer, erbium-doped fiber amplifier, send into transmission (in the fibre circuit optical line amplifier can be set as required) in the optical fiber, after arriving receiving terminal, amplify through the optical fiber preamplifier, revert to each original road light signal by optical branching filter.
At present, be accompanied by the develop rapidly of WDM technology, the technology relevant with its application also launched, as the network monitoring information transmission technology.The so-called network monitoring information transmission technology is meant between network element and the network element by setting up communication link, and then utilizes the communication link of described foundation to transmit network management monitoring information, and described network management monitoring information comprises performance information, operating state, warning information etc.If wdm system can not carry out effective network monitoring message transmission, will be difficult in wide-scale adoption in the network.
The network monitoring message transmission mainly adopts dual mode in the wdm system at present: Optical Supervisory Channel (OSC, Optical Supervisory Channel) mode and accent top mode (Pilot Tone Modulation)
Optical Supervisory Channel (OSC, Optical Supervisory Channel) mode is mainly used in traditional wdm system, it realizes that principle is that Optical Supervisory Channel adopts an independently wavelength, its data format adopts the E1 frame structure of standard, general speed is 2.048Mb/s, in its frame structure, stipulated the data communication channel (DCC of the similar SDH D1～D12 of system, Data Communication Channels), be used for transmitting the network management monitoring information of wdm system specially, thereby the DCC passage among the OSC (being the DCC byte) is exactly the physical carrier layer of WDM network management monitoring information.
Concrete communication process is briefly described as follows:
Receiving system control of OSC unit and (SCC, the System Control ﹠amp of communicating by letter; Communication) the overhead data frame of unit (also abbreviating main control unit as), after treatment, finish the electric light conversion by light emission module, the monitor data frame is modulated on the OSC wavelength (is generally 1510nm, 1625nm or 1310nm), the OSC wavelength is gone into fibre by optical multiplexer and flashlight after multiplexing and is sent to opposite equip., the opposite end will be imported light with optical branching filter and be divided into flashlight and osc light signal, the Optical Receivers of opposite end OSC unit is finished the opto-electronic conversion of osc light signal then, the monitor data frame that restores is delivered to the SCC unit after treatment and is carried out exchanges data.
With reference to figure 1, clock synchronization is in the clock of an end SCC in this scheme, and when the upstream node of optical fiber generation fracture or certain node breaks down, the clock information of downstream node will be lost, and will be also dumb in the realization.
In addition, utilize Optical Supervisory Channel OSC to transmit network management monitoring information, need take a wavelength, therefore, another shortcoming of this technical scheme is to realize that cost is higher.
And transfer the top mode is monitor message to be superimposed upon transmit on the main business, and it is by on the main business signal of transmitter terminal, and stack one low frequency Sine Modulated by a small margin is as sign; At receiving terminal two signals are effectively separated, different channels adopts different modulating frequencies, differentiates the power level of corresponding light signal in each relay by detecting each frequency modulated signal, thereby realizes the transmission of monitor message.
Utilize and transfer the necessary suitable accent top degree of depth m of determining of jacking row monitor message transmission, described accent top degree of depth m to be meant the peak-to-peak value Vpp of luminous power modulation amplitude and the ratio of " 1 " sign indicating number average light power level Vm, the accurate detection that the top signal is transferred in the too little meeting influence of m; M then can cause bigger influence to the bit error performance of system too greatly.
Industry test and theoretical research show transfers the top modulation that the error code slope of curve is changed, and along with the increase of transferring the top degree of depth, the error code curve becomes more and more milder.This be because the signal power that receives of receiver hour, noise to the contribution of system's error code greater than the contribution of transferring the top to error code; And when the signal power that receives was big, situation was just in time opposite.
Equal 10 negative 12 powers with error rate BER and be as the criterion, transferring top degree of depth m is 5% and 13% o'clock, and receiver sensitivity descends respectively about 0.4dB and 1.0dB; When m further increased, receiver sensitivity can sharply descend, and during as m=18%, receiver sensitivity descends and reaches 2.3dB.As seen, m＜=10% o'clock theory and measured result are comparatively identical; M〉then error is bigger after 10%, in addition, m＜10% o'clock, the variation of system BER at two orders of magnitude with interior (negative 10 powers of negative 12 powers～10 of 10).Measured result shows: when negative 12 powers of the error rate from 10 changed to 10 negative ten powers, the receiver received power roughly changed 1dB.So transfer the top degree of depth, transfer the influence of pushing up system receiver sensitivity less than 0.5dB 5% when following.
To sum up, the performance index on the main business of this scheme and accent top can not be accomplished the best simultaneously, must sacrifice to some extent in certain scope of acceptable.
Summary of the invention
The technical problem that the present invention solves provides a kind of information transmission equipment flexibly, method and system, the influence of adopting described equipment, method or system can avoid prior art to adopt the intrinsic clock tracing of the method for synchronization to cause, can not produce the contradiction of transferring main business intrinsic in the technology of top and transferring the top performance index, and can break away from of the dependence of traditional wdm system to OSC, solution realizes communicating by letter between network element in the wdm system of no OSC, and reduces networking cost greatly.
For addressing the above problem, information transmission equipment of the present invention comprises:
The first asynchronous process unit is used for receiving up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and control is read described up monitor message and sent according to second clock;
The first overhead processing unit is used for receiving described up monitor message from the described first asynchronous process unit, then described up monitor message is become optical transmission signal with the business datum encapsulation process, is transferred to remote network element by optical link;
The second overhead processing unit is used for receiving the optical transmission signal that remote network element is sent from optical link, then described optical transmission signal is carried out deblocking and handles, to obtain the descending monitor message that remote network element sends to local network element;
The second asynchronous process unit is used for receiving described descending monitor message and buffer memory according to second clock control from the described second overhead processing unit, according to first clock control described descending monitor message is sent to local network element processing then.
Wherein, the described first asynchronous process unit comprises:
Up asynchronous FIFO unit is used for the local network element of buffer memory and sends to the up monitor message of remote network element, and separately reads and writes clock to realize asynchronous process;
First receives control module, is used for writing described up asynchronous FIFO unit according to the up monitor message that local network element is transmitted in first clock control;
First sends control module, is used for according to second clock control and reads described up monitor message from described up asynchronous FIFO unit and send;
The described second asynchronous process unit comprises:
Descending asynchronous FIFO unit is used for the descending monitor message that the buffer memory remote network element sends to local network element, and separately reads and writes clock to realize asynchronous process;
Second receives control module, is used for the descending monitor message that remote network element is sent in control according to second clock and writes described descending asynchronous FIFO unit;
Second sends control module, is used for reading described up monitor message from described descending asynchronous FIFO unit and sending to the processing of local network unit according to first clock control.
Wherein, the described first overhead processing unit comprises:
The monitoring expense is inserted the unit, is used for the monitor message data are inserted into the predetermined overhead byte of the optical transmission signal of transport service, so that transmit in optical link with business datum;
The described second overhead processing unit comprises:
Monitoring overhead extraction unit is used for extracting the monitor message that the described predetermined overhead byte of optical transmission signal that receives from optical link transmits.
Wherein, described optical transmission signal is the synchronous transfer module signal, and described predetermined overhead byte is the data communication channel byte.
Wherein, the described first asynchronous process unit and the second asynchronous process unit adopt field programmable gate array or Erasable Programmable Logic Device.
Accordingly, information transferring method of the present invention comprises:
The monitor message transfer step:
The a1 information transmission equipment receives up monitor message and the buffer memory that local network element sends to remote network element according to first clock control; And
B1 controls according to second clock and reads the up monitor message of described buffer memory and then become optical transmission signal to be transferred to remote network element by optical link with the business datum encapsulation process described up monitor message;
The monitor message receiving step:
The a2 information transmission equipment receives the optical transmission signal that remote network element is sent from optical link, then described optical transmission signal is carried out deblocking and handles, to obtain the descending monitor message that remote network element sends to local network element; And
B2, reads described descending monitor message according to first clock control then and sends to local network element processing described descending monitor message buffer memory according to second clock control.
Wherein, step a1, b2 all carry out buffer memory by asynchronous first in first out unit, and separately read and write clock to realize asynchronous process.
Wherein, the described encapsulation process of step b1 is for to be inserted into the predetermined overhead byte of the optical transmission signal of transport service with the monitor message data, so that transmit in optical link with business datum;
The described deblocking of step b2 is treated to and extracts the described monitor message that predetermined overhead byte transmits from the optical transmission signal that optical link receives.
Wherein, described optical transmission signal is the synchronous transfer module signal, and described predetermined overhead byte is the data communication channel byte.
Accordingly, a kind of information transmission system of the present invention is used for transmitting monitor message between the network element of wavelength division multiplexing Optical Transmission Network OTN, comprising:
Main control unit, the up monitor message that is used for local network element is sent to remote network element sends, and receives descending monitor message that remote network element sends to carry out respective handling;
Wavelength conversion unit is connected with described main control unit, is used for controlling respectively and described main control unit and the mutual monitor message of optical link according to the corresponding clock of master control side and line side different clock-domains; Wherein, described wavelength conversion unit comprises the first asynchronous process unit, the first overhead processing unit, the second overhead processing unit and the second asynchronous process unit.
In the described wavelength conversion unit:
The first asynchronous process unit is used for receiving up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and control is read described up monitor message and sent according to second clock then;
The first overhead processing unit is used for receiving described up monitor message from the described first asynchronous process unit, becomes optical transmission signal to be transferred to remote network element by optical link with the business datum encapsulation process described up monitor message then;
The second overhead processing unit is used for receiving the optical transmission signal that remote network element is sent from optical link, then described optical transmission signal is carried out deblocking and handles, to obtain the descending monitor message that remote network element sends to local network element;
The second asynchronous process unit is used for receiving described descending monitor message and buffer memory according to second clock control from the described second overhead processing unit, according to first clock control described descending monitor message is sent to local network element processing then.
Wherein, the described first asynchronous process unit comprises:
Up asynchronous FIFO unit is used for the local network element of buffer memory and sends to the up monitor message of remote network element, and separately reads and writes clock to realize asynchronous process;
First receives control module, is used for writing described up asynchronous FIFO unit according to the up monitor message that local network element is transmitted in first clock control;
First sends control module, is used for according to second clock control and reads described up monitor message from described up asynchronous FIFO unit and send;
The described second asynchronous process unit comprises:
Descending asynchronous FIFO unit is used for the descending monitor message that the buffer memory remote network element sends to local network element, and separately reads and writes clock to realize asynchronous process;
Second receives control module, is used for the descending monitor message that remote network element is sent in control according to second clock and writes described descending asynchronous FIFO unit;
Second sends control module, is used for reading described up monitor message from described descending asynchronous FIFO unit according to first clock control and sends to local network element processing.
Wherein, the described first overhead processing unit comprises:
The monitoring expense is inserted the unit, is used for the monitor message data are inserted into the predetermined overhead byte of the optical transmission signal of transport service, so that transmit in optical link with business datum;
The described second overhead processing unit comprises:
Monitoring overhead extraction unit is used for extracting the monitor message that the described predetermined overhead byte of optical transmission signal that receives from optical link transmits.
Wherein, described optical transmission signal is the synchronous transfer module signal, and described predetermined overhead byte is the data communication channel byte.
Wherein, the described first asynchronous process unit and the second asynchronous process unit adopt field programmable gate array or Erasable Programmable Logic Device.
Compared with prior art, the present invention has following beneficial effect:
At first, the present invention realizes communicating by letter between network element by asynchronous system, for example with wavelength shifter (OTU, Optical Transponder Unit) clock of device processes transfer of data separates independence according to the SCC side with OTU side clock, read and write data according to different clocks then, thereby avoided a series of problems such as clock tracing transparent transmission of using the method for synchronization to bring.
Secondly, the present invention does not need independent OSC to be used for the monitor message transmission by monitor message is transmitted with business, therefore, can reduce system cost greatly, improves product competitiveness, and is especially highly beneficial to the low-cost solution of metropolitan area network.
Once more, do not exist among the present invention in the technology of accent top owing to transfer the influence of top system's error performance.
Once more, information can transmit by the DCC byte among the present invention, therefore also further has the fast advantage of the rate of information throughput, if 12 DCC bytes are all used, speed can reach 768Kbps.
Description of drawings
Fig. 1 is that the prior art clock synchronization is followed the tracks of schematic diagram;
Fig. 2 is that information transmission equipment of the present invention is formed schematic diagram;
Fig. 3 is that schematic diagram is formed in the first asynchronous process unit shown in Figure 2;
Fig. 4 is that schematic diagram is formed in the second asynchronous process unit shown in Figure 2;
Fig. 5 is the composition schematic diagram of a kind of information transmission system of the present invention;
Fig. 6 is the composition schematic diagram of the another kind of information transmission system of the present invention;
Fig. 7 is a kind of composition environment schematic diagram of the information transmission system of the present invention;
Fig. 8 is the signal connection diagram of asynchronous process unit F PGA design of the present invention;
Fig. 9 is a kind of embodiment signal connection diagram of FPGA overhead processing shown in Figure 8;
Figure 10 is the logic module block diagram of FPGA shown in Figure 9;
Figure 11 is the flow chart that FPGA of the present invention receives information;
Figure 12 is the flow chart that FPGA of the present invention sends information.
Embodiment
The present invention is used to realize communicate by letter between the network element of optical-fiber network, its cardinal principle is to adopt the asynchronous clock processing mode to solve the problem of the clock synchronization tracking that the Synchronous Processing mode exists in the prior art, promptly increases the asynchronous process unit and be used to realize asynchronous process on optical-fiber network transmission equipment such as OTU.In addition, the predetermined overhead byte that the present invention also inserts the monitor message of communicating by letter between network element optical transmission signal transmits with business, if described optical transmission signal is synchronous transfer module (STM, Synchronous Transport Module) signal, the overhead byte that adopts when specific implementation can be any DCC byte, also can be other any free Bytes.Owing to be, therefore can avoid dependence, and reduce networking cost greatly OSC with the road load mode.
Below be described in detail, for the convenience of narrating, the up direction of definition message transmission is: local network element mails to the remote network element direction, down direction is: remote network element is issued local network element, in addition, because the optical transmission signal that specifically transmits in optical link is not an emphasis of the present invention, and does not influence the beneficial effect that the present invention produces, following optical transmission signal will be that example describes with the STM signal.
Fig. 2 is the composition schematic diagram of information transmission equipment of the present invention.As shown in Figure 2, information transmission equipment of the present invention comprises the first asynchronous process unit 10, the first overhead processing unit 11, the second overhead processing unit 12 and the second asynchronous process unit 13.
The first asynchronous process unit 10, its major function are to receive up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and then control is read described up monitor message and sent according to second clock.The described first asynchronous process Elementary Function specifically can adopt field programmable gate array (FPGA, Field Programmable Gate Array), Erasable Programmable Logic Device (EPLD, Erasable Programmable Logic Device) or other Programmable Design device or integrated circuit (IC) chip realize.
The first overhead processing unit 11 receives described up monitor message from the described first asynchronous process unit 10, and then described up monitor message is packaged into the synchronous transfer module signal with business datum is transferred to remote network element by optical link.During specific implementation, in order to realize that monitor message and business datum are formed the Synchronous Transport Signal that can transmit in Optical Transmission Network OTN, the described first overhead processing unit further comprises monitoring expense insertion unit, be used for the monitor message data are inserted into the synchronous transfer module (STM of transport service, Synchronous Transport Module) the predetermined overhead byte of signal, so that in optical link, transmit with business datum, because expense and business datum are packaged into the known technology that the STM signal is this area, can adopt corresponding light equipment to realize, repeat no more here.
The second overhead processing unit 12 receives the synchronous transfer module signal that remote network element is sent from optical link, and then described synchronous transfer module signal is separated frame handle, to obtain the descending monitor message that remote network element sends to local network element.And in order to parse the monitor message that transmits in the Optical Transmission Network OTN, the described second overhead processing unit further comprises monitoring overhead extraction unit, is used for extracting the monitor message that the described predetermined overhead byte of synchronous transfer module signal that receives from optical link transmits.Because the STM signal is separated frame and extracted corresponding Overhead is techniques well known, also is not described in detail here.
The second asynchronous process unit 13, control receives described descending monitor message and buffer memory from the described second overhead processing unit according to second clock, and then according to first clock control described descending monitor message is sent to local network element processing.
With the described first asynchronous process unit class seemingly, during specific implementation, the described second asynchronous process Elementary Function can adopt FPGA, EPLD or other Programmable Design device or integrated circuit (IC) chip to realize equally.
Further specify information transmission equipment of the present invention below, Fig. 3 is the detailed composition schematic diagram of the first asynchronous process unit shown in Figure 2, and as shown in Figure 3, the described first asynchronous process unit 10 comprises:
Last line asynchronous first in first out (FIFO, First In First Out) unit 100 is used for the local network element of buffer memory and sends to the up monitor message of remote network element, and separately reads and writes clock to realize asynchronous process.
The problem that multi-clock zone brings is exactly how to design the interface circuit between the asynchronous clock.Asynchronous FIFO is a kind of circuit of first in first out, uses the part that produces data-interface at needs, is used for storing, being buffered in two transfer of data between the asynchronous clock.Can be implemented in speed and convenience ground transmitting real-time data between two different clocks systems.
First receives control unit 101, is used for writing described up asynchronous FIFO unit according to the up monitor message that local network element is transmitted in first clock control and carries out buffer memory;
First sending controling unit 102 is used for reading described up monitor message from described up asynchronous FIFO unit and sending according to second clock control.
The second asynchronous process unit and the first asynchronous process Elementary Function are similar among the present invention, and the clock that its difference is is just specifically received and sent messages is opposite, and Fig. 4 is the detailed composition schematic diagram of the second asynchronous process unit shown in Figure 2.The described second asynchronous process unit 13 comprises:
Descending asynchronous FIFO unit 130 is mainly used in the descending monitor message that the buffer memory remote network element sends to local network element, and separately reads and writes clock to realize asynchronous process;
Second receives control unit 131, is mainly used in remote network element is sent in control according to second clock descending monitor message and writes described descending asynchronous FIFO unit and carry out buffer memory;
Second sending controling unit 132 is mainly used in according to first clock control and reads described up monitor message from described descending asynchronous FIFO unit and send to the processing of local network unit.
Realize among the present invention that above-mentioned information transmission equipment can for example increase the asynchronous process function by increasing the function realization of corresponding network equipment among the OTU, corresponding asynchronous process function then can adopt programmable circuit designs such as FPGA or EPLD to realize.
The following describes the workflow of information transmission equipment of the present invention, receive and send two processes according to monitor message below and be described.
The monitor message transfer step:
A1, information transmission equipment receive up monitor message and the buffer memory that local network element sends to remote network element according to first clock control; And
B1, read the up monitor message of described buffer memory and then become optical transmission signal to be transferred to remote network element with the business datum encapsulation process described up monitor message by optical link according to second clock control, wherein said encapsulation process is for to be inserted into the predetermined overhead byte of the optical transmission signal of transport service with the monitor message data, so that transmit in optical link with business datum;
The monitor message receiving step:
A2, information transmission equipment receive the optical transmission signal that remote network element is sent from optical link, and then described optical transmission signal is carried out deblocking handle, to obtain the descending monitor message that remote network element sends to local network element, described deblocking is treated to and extracts the described monitor message that predetermined overhead byte transmits from the optical transmission signal that optical link receives;
B2, according to second clock control with described descending monitor message buffer memory, and then described descending monitor message is sent to local network element processing according to first clock control.
Need to prove, during concrete enforcement, above-mentioned steps a1, b2 all can carry out buffer memory by asynchronous first in first out unit, and separately read and write clock to realize asynchronous process, and described optical transmission signal can be the synchronous transfer module signal, also can be other signals that can in Optical Transmission Network OTN, transmit, Optical Transmission Network OTN (OTN for example, Optical Transport Network) signal, if described optical transmission signal adopts the synchronous transfer module signal, then described predetermined overhead byte can adopt DCC byte or other any available overhead bytes.
Fig. 5 is the present invention's a kind of composition schematic diagram of the information transmission system on the other hand.As shown in Figure 5, the described information transmission system comprises main control unit 50 and wavelength conversion unit 51.
Wherein said wavelength conversion unit 51 is a wavelength shifter, is to be that the wavelength of standard is so that exchange and transmit in whole net with off-gauge wavelength Conversion.OTU carries out regeneration function under the situation of optical signal deterioration.The another one critical function of OTU is an overhead processing.It extracts expense and processing from signal.Because OTU can contact the signal of telecommunication, so it is easy to carry out overhead processing.OTU is photoelectricity OTU mostly now.Among the present invention described OTU has been increased corresponding asynchronous process function, during specific implementation, described wavelength conversion unit function can adopt above-mentioned information transmission equipment to realize, no longer describes in detail here.
Fig. 6 is the composition schematic diagram of the another kind of information transmission system of the present invention.As shown in Figure 6, the described information transmission system comprises main control unit 60, the first asynchronous process unit 61, the first overhead processing unit 62, the second overhead processing unit 63 and the second asynchronous process unit 64.
The first asynchronous process unit 61 is used for receiving up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and then control is read described up monitor message and sent according to second clock;
The first overhead processing unit 62 is used for receiving described up monitor message from the described first asynchronous process unit, and then described up monitor message is packaged into the synchronous transfer module signal with business datum is transferred to remote network element by optical link;
The second overhead processing unit 63 is used for receiving the synchronous transfer module signal that remote network element is sent from optical link, and then described synchronous transfer module signal is separated frame handle, to obtain the descending monitor message that remote network element sends to local network element;
The second asynchronous process unit 64 is used for receiving described descending monitor message and buffer memory according to second clock control from the described second overhead processing unit, and then according to first clock control described descending monitor message is sent to local network element processing.
In the above-mentioned information transmission system, the function of first kind of information transmission system medium wavelength converting unit is realized by each component units, might not adopt wavelength conversion unit when also being specific implementation, but realize by each functional unit combination, wherein the specific implementation of each functional unit can repeat no more here with reference to the associated description of above-mentioned information transmission equipment.
Describe with specific embodiment below, Fig. 7 is a kind of enforcement network environment schematic diagram of the information transmission system of the present invention.As shown in Figure 7, local network element master control borad system and control unit (SCC, SystemControl; Communication) need the communication interaction monitor message and between remote network element master control borad SCC.OTU equipment (as shown, being OTU1 in this locality, is OTU2 at far-end) is all being arranged between local network element side and transmission line and between remote network element and the line side, and each OTU equipment includes the asynchronous process unit.
In order to narrate conveniently, below OTU equipment is divided into SCC side and line side by clock zone, wherein the interface section with asynchronous process unit in the OTU equipment and clock zone 1 is called the SCC side, and the interface section of asynchronous process unit and clock zone 2 is called the line side.Clock 1 is used in local OTU equipment asynchronous process unit and the transmitting-receiving of SCC side expense, uses clock 2 with the transmitting-receiving of line side expense; Clock 4 is used in far-end OTU2 equipment asynchronous process unit and the transmitting-receiving of SCC side expense, then uses clock 3 with the line side transmitting-receiving.
Among the present invention so-called asynchronous be asynchronous (perhaps between the clock 3,4 asynchronous) between the clock 1,2, four clock sources are described as follows:
In above-mentioned network environment, OTU equipment comprises that the asynchronous process unit can realize asynchronous process, in addition because overhead processing, wavelength Conversion function that the OTU equipment self has can realize that then the information of will communicate by letter between network elements such as monitor message is converted to the STM signal with business datum and transmits in optical-fiber network, therefore, do not need extra OSC plate.
Specifically describe with the asynchronous process unit that adopts the FPGA design below, please refer to Fig. 8, OTU finishes in fpga logic inside with communicating by letter of master control borad SCC and line side overhead processing part, the signal annexation of FPGA both sides as shown in Figure 8, FPGA is connected by the overhead data line with master control borad SCC and OTU line side overhead processing part, in addition, up direction and down direction all have corresponding expense clock and expense frame synchronizing signal.
Fig. 9 is a kind of embodiment signal connection diagram of FPGA overhead processing shown in Figure 8.
What FPGA adopted in the present embodiment is the serial ports expense of 2M, and each frame has 32 time slots, and frame frequency is 8KHZ.The overhead byte that transmits monitor message adopts the DCC byte, below is that example is carried out explaining illustration with 2M serial ports expense just.
Clock 1:CLK2M_SCC
Clock 2:CLK2M_OTU
Up direction receives expense and uses clock CLK2M_SCC, and up direction sends expense and uses clock CLK2M_OTU;
Down direction receives expense and uses clock CLK2M_OTU, and down direction sends expense and uses clock CLK2M_SCC;
SDO_SCC, SDO_OTU, SDI_SCC, SDI_OTU are the overhead data line;
CLK2M_SCC, CLK2M_OTU are the expense clock of 2M;
FP8K_SCC, FP8K_OTU are frame synchronizing signal;
Signal is as shown in Table 1 in detail:
Table one
| Signal | Describe |
| CLK2M_OTU | 2.048M, the DCC serial communication interface clock in FPGA and line side |
| CLK2M_SCC | 2.048M, FPGA and SCC side DCC serial communication interface clock |
| FP8K_OTU | The 8K frame synchronizing signal is used for the location of DCC serial communication expense time slot.Be synchronized with CLK2M_OTU |
| FP8K_SCC | The 8K frame synchronizing signal is used for the location of DCC serial communication expense time slot.Be synchronized with CLK2M_SCC |
| SDI_OTU | OTU line side and FPGA interface overhead serial port data line, FPGA receives |
| SDI_SCC | SCC side and FPGA interface overhead serial port data line, FPGA receives |
| SDO_OTU | OTU line side and FPGA interface overhead serial port data line, FPGA sends |
| SDO_SCC | SCC side and FPGA interface overhead serial port data line, FPGA sends |
Figure 10 is that the logic module of FPGA shown in Figure 9 is formed schematic diagram.FPGA mainly comprises logic module 1,2,3,4, and asynchronous FIFO 1 and asynchronous FIFO 2, carry out transfer of data according to High-Level Data Link Control (HDLC, High level Data Link Control) agreement between master control borad SCC and the OTU, wherein logic module 1 is mainly finished following function:
1) overhead extraction.For the data on the serial ports overhead bus, receive only needed time slot, other time slot is not all handled, and promptly abandons, and also promptly according to the time slot position of effective information in expense, selective reception is the effective time slot of DCC in the present embodiment.
2) shaving of empty information removed.Because master control borad SCC sends to FPGA according to the HDLC agreement with monitor message packing, therefore, when receiving the monitor message of master control borad, need find out between two effective HDLC packets invalid information (as FF) and abandon, do not write FIFO.
3) search of HDLC frame head delimiter 7E and frame end delimiter.Promptly need find frame head and postamble for each bag that receives; Only effective information can write FIFO.
4) read-write of control FIFO enables.
1) expense is inserted.If FIFO is a readable state, then read effective time slot that FIFO inserts the effective information that receives in the FIFO expense at the effective time slot of DCC therebetween; FIFO is readable state not else if, then all inserts ' 1.
2) read-write of control FIFO enables.
1) overhead extraction.The monitor message that predetermined overhead byte transmits in the STM signal that the extraction line side sends, and,, described Overhead is write FIFO at the effective time slot of DCC therebetween if FIFO is for can write state.
2) read-write of control FIFO enables.
1) read-write of control FIFO enables.
2) data protocol frame encapsulation.The monitor message that reads is packaged into the SCC that the HDLC frame sends to master control borad.
3) expense is inserted.Packaged monitor message Frame is inserted into expense serial ports with the SCC side.
Up FIFO1 module is finished following function:
Write clock: CLK2M_SCC
Read clock: CLK2M_OTU
Descending FIFO1 module is finished following function:
Write clock: CLK2M_OTU
Read clock: CLK2M_SCC
The above-mentioned realization that designs asynchronous process unit among the OTU with concrete FPGA has been described in detail, owing to adopt asynchronous process, can cancel the method for synchronization and carry out the clock tracing dependence of communicating by letter between network element, make overhead processing send-receive clock territory on same direction independent fully.
The operating process of above-mentioned FPGA is described below in conjunction with the idiographic flow of message transmission.Be without loss of generality, monitor message is transmitted as example to adopt the DCC byte.
Figure 11 is the flow process of up direction message transmission.
At step s100, master control borad SCC is inserted into monitor message the DCC passage of expense serial ports by specific protocol (be generally High level DataLink Control, High-Level Data Link Control is called for short HDLC, also can use other agreement to realize in theory);
At step s101, logic module 1 receives the Overhead (SDI_SCC) that SCC sends over, therefrom extract required effective time slot, search for the frame delimiter 7E of HDLC simultaneously, begin to write asynchronous FIFO 1 after finding, behind the frame end delimiter that writes HDLC, close writing of FIFO1 and enable, forbid writing, wait for the arrival of next HDLC frame;
At step s102, logic module 2 judges whether asynchronous FIFO 1 is readable, if readable then, then, read effective time slot that information is inserted OTU side expense from FIFO1, if not readable at step s103, then at step s104, toward effective time slot insertion ' 1 ' of OTU side expense;
At step s105, overhead processing part is formed overhead data with business datum synchronous transfer module signal sends to Optical Transmission Network OTN and is transferred to remote network element at last.
Figure 12 is the flow process that down direction receives information.
At step s200, the synchronous transfer module signal that the overhead processing part receiving lines side of OTU is sent, and extract the monitor message that predetermined overhead byte transmits in the described synchronous transfer module signal;
At step s201, logic module 4 is written to asynchronous FIFO 2 with described monitor message then;
Further at step s202, logic module 3 judges whether asynchronous FIFO 2 is readable, if it is readable, then at step s203, read the monitor message of buffer memory from asynchronous FIFO 2, be packaged into effective time slot that the HDLC protocol frame format is inserted OTU master control side expense then, if not readable, then at step s204, toward effective time slot insertion ' 1 ' of OTU master control borad expense;
At step s203, master control borad SCC receives the monitor message of described HDLC data frame format at last, separates frame and carries out respective handling.
To sum up, the present invention has cancelled the intrinsic clock tracing dependence of the method for synchronization owing to adopt asynchronous system to realize communicating by letter between network element, makes overhead processing send-receive clock territory on same direction independent fully.
And owing to need not independent OSC plate transmission monitor message etc., thereby can reduce networking cost greatly, break away from dependence to OSC, solve the problem of in the wdm system of no OSC, communicating by letter between the realization network element.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. information transmission equipment is used for transmitting monitor message between the network element of optical-fiber network, it is characterized in that, comprising:
The first asynchronous process unit is used for receiving up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and control is read described up monitor message and sent according to second clock;
The first overhead processing unit is used for receiving described up monitor message from the described first asynchronous process unit, and described up monitor message is become optical transmission signal with the business datum encapsulation process, is transferred to remote network element by optical link;
The second overhead processing unit is used for receiving the optical transmission signal that remote network element is sent from optical link, described optical transmission signal is carried out deblocking handle, to obtain the descending monitor message that remote network element sends to local network element;
The second asynchronous process unit is used for receiving described descending monitor message and buffer memory according to second clock control from the described second overhead processing unit, according to first clock control described descending monitor message is sent to local network element processing.
2. information transmission equipment according to claim 1 is characterized in that, the described first asynchronous process unit comprises:
Last line asynchronous first in first out unit is used for the local network element of buffer memory and sends to the up monitor message of remote network element, and separately reads and writes clock to realize asynchronous process;
First receives control module, is used for writing the described line asynchronous first in first out unit of going up according to the up monitor message that local network element is transmitted in first clock control;
First sends control module, is used for reading described up monitor message and sending from described upward line asynchronous first in first out unit according to second clock control;
The described second asynchronous process unit comprises:
Following line asynchronous first in first out unit is used for the descending monitor message that the buffer memory remote network element sends to local network element, and separately reads and writes clock to realize asynchronous process;
Second receives control module, is used for the descending monitor message that remote network element is sent in control according to second clock and writes described line asynchronous first in first out unit down;
Second sends control module, is used for reading described up monitor message and sending to the processing of local network unit from described line asynchronous first in first out unit down according to first clock control.
3. information transmission equipment according to claim 1, the described first overhead processing unit comprises:
The monitoring expense is inserted the unit, is used for the monitor message data are inserted into the predetermined overhead byte of the optical transmission signal of transport service, so that transmit in optical link with business datum;
The described second overhead processing unit comprises:
Monitoring overhead extraction unit is used for extracting the monitor message that the described predetermined overhead byte of optical transmission signal that receives from optical link transmits.
4. information transmission equipment according to claim 3 is characterized in that, described optical transmission signal is the synchronous transfer module signal, and described predetermined overhead byte is the data communication channel byte.
5. according to each described information transmission equipment of claim 1-4, it is characterized in that the described first asynchronous process unit and the second asynchronous process unit adopt field programmable gate array or Erasable Programmable Logic Device.
6, a kind of information transferring method is applied to it is characterized in that in the aforementioned information transmission equipment, comprising:
The monitor message transfer step:
The a1 information transmission equipment receives up monitor message and the buffer memory that local network element sends to remote network element according to first clock control; And
B1 controls the up monitor message that reads described buffer memory according to second clock, becomes optical transmission signal to be transferred to remote network element by optical link with the business datum encapsulation process described up monitor message then;
The monitor message receiving step:
The a2 information transmission equipment receives the optical transmission signal that remote network element is sent from optical link, described optical transmission signal is carried out deblocking handle, and obtains the descending monitor message that remote network element sends to local network element; And
B2, reads described descending monitor message according to first clock control then and sends to local network element processing described descending monitor message buffer memory according to second clock control.
7, information transferring method according to claim 6 is characterized in that, step a1, b2 all carry out buffer memory by asynchronous first in first out unit, and separately reads and writes clock to realize asynchronous process.
8, information transferring method according to claim 6 is characterized in that, the described encapsulation process of step b1 is for to be inserted into the predetermined overhead byte of the optical transmission signal of transport service with the monitor message data, so that transmit in optical link with business datum;
The described deblocking of step b2 is treated to and extracts the described monitor message that predetermined overhead byte transmits from the optical transmission signal that optical link receives.
According to each described information transferring method of claim 6-8, it is characterized in that 9, described optical transmission signal is the synchronous transfer module signal, described predetermined overhead byte is the data communication channel byte.
10. information transmission system is used for transmitting monitor message between the network element of optical-fiber network, it is characterized in that, comprising:
Main control unit, the up monitor message that is used for local network element is sent to remote network element sends, and receives descending monitor message that remote network element sends to carry out respective handling;
Wavelength conversion unit is connected with described main control unit, is used for controlling respectively and described main control unit and the mutual monitor message of optical link according to the corresponding clock of master control side and line side different clock-domains; Wherein, described wavelength conversion unit comprises the first asynchronous process unit, the first overhead processing unit, the second overhead processing unit and the second asynchronous process unit;
The described first asynchronous process unit is used for receiving up monitor message and the buffer memory that local network element sends to remote network element according to first clock control, and control is read described up monitor message and sent according to second clock;
The described first overhead processing unit is used for receiving described up monitor message from the described first asynchronous process unit, becomes optical transmission signal to be transferred to remote network element by optical link with the business datum encapsulation process described up monitor message;
The described second overhead processing unit is used for receiving the optical transmission signal that remote network element is sent from optical link, described optical transmission signal is carried out deblocking handle, to obtain the descending monitor message that remote network element sends to local network element;
The described second asynchronous process unit is used for receiving described descending monitor message and buffer memory according to second clock control from the described second overhead processing unit, according to first clock control described descending monitor message is sent to local network element processing.
11. the information transmission system according to claim 10 is characterized in that, the described first asynchronous process unit comprises:
Last line asynchronous first in first out unit is used for the local network element of buffer memory and sends to the up monitor message of remote network element, and separately reads and writes clock to realize asynchronous process;
First receives control module, is used for writing the described line asynchronous first in first out unit of going up according to the up monitor message that local network element is transmitted in first clock control;
First sends control module, is used for reading described up monitor message and sending from described upward line asynchronous first in first out unit according to second clock control;
The described second asynchronous process unit comprises:
Following line asynchronous first in first out unit is used for the descending monitor message that the buffer memory remote network element sends to local network element, and separately reads and writes clock to realize asynchronous process;
Second receives control module, is used for the descending monitor message that remote network element is sent in control according to second clock and writes described line asynchronous first in first out unit down;
Second sends control module, is used for reading described up monitor message according to first clock control from described line asynchronous first in first out unit down and sends to local network element processing.
12. the information transmission system according to claim 10 is characterized in that, the described first overhead processing unit comprises:
The monitoring expense is inserted the unit, is used for the monitor message data are inserted into the predetermined overhead byte of the optical transmission signal of transport service, so that transmit in optical link with business datum;
The described second overhead processing unit comprises:
Monitoring overhead extraction unit is used for extracting the monitor message that the described predetermined overhead byte of optical transmission signal that receives from optical link transmits.
13. the information transmission system according to claim 12 is characterized in that, described optical transmission signal is the synchronous transfer module signal, and described predetermined overhead byte is the data communication channel byte.
14., it is characterized in that the described first asynchronous process unit and the second asynchronous process unit adopt field programmable gate array or Erasable Programmable Logic Device according to each described information transmission system of claim 10-13.
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| CNB2004100710100A CN100499406C (en) | 2004-07-26 | 2004-07-26 | Information transmission equipment, method and system |
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| CN101267390B (en) * | 2008-05-07 | 2010-11-10 | 蓝鸽集团有限公司 | Asynchronous delay network communication method, its system and buffer processing device |
| CN102170310B (en) * | 2011-05-06 | 2016-12-28 | 中兴通讯股份有限公司 | A kind of method and device of optical network path detection |
| CN104468024B (en) | 2013-09-23 | 2020-01-14 | 中兴通讯股份有限公司 | Method, device and system for configuring nodes |
| CN108668183B (en) * | 2017-03-27 | 2020-09-18 | 工业和信息化部电信研究院 | Optical network synchronization test method and system |
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