CN102684955B - Self-adaptive access system and method of 1G Ethernet and OC (Optical Carrier) 48 network - Google Patents
Self-adaptive access system and method of 1G Ethernet and OC (Optical Carrier) 48 network Download PDFInfo
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Abstract
The invention provides a self-adaptive access system and method of 1G Ethernet and OC (Optical Carrier) 48 network. The self-adaptive access system is realized based on fpga (Field Programmable Gata Array). The fpga has the advantage of flexible online programmable characteristic and can switch network access types in a nanosecond level under the condition that power is not off. The self-adaptive access system also comprises a programmable crystal oscillator of a peripheral chip and a deserializing module serdes in the inner part of the fpga. The self-adaptive access method comprises the following steps: start depends on a signallost signal transferred to the fpga by a photoelectric converter and a global reset signal of a circuit; a start state IIC is not configured with the crystal oscillator in the circuit and detects the 1G Ethernet network type; and MAC (Multiaction Computer) fifo (first in, first out) or POS (Point of Sale) fifo is utilized to respectively detect the two network types. According the self-adaptive access system and method of the 1G Ethernet and the OC 48 network provided by the invention, the network access does not need any artificial setting; and if an optical fiber insertion action exists, the 1G Ethernet and the OC 48 network are automatically detected and adapted.
Description
Technical field
The invention belongs to network communication field, specifically relate to a kind of 1G Ethernet and OC48 network self-adapting connecting system and method.
Background technology
In the network environment of complexity, 1G Ethernet and OC48 network insertion generally coexist, that is, their Line rate are suitable, so for the network equipment, more than the support of consolidated network interface two kinds of procotols are for user being device upgrade or to change network insertion be scheme the most easily.They can share the optical module of same model, optical fiber and hardware circuit; But their operating reference clock is different, if the network equipment is thought successfully to switch between these two kinds of network insertion types, just must change the crystal oscillator of different frequency to change the reference clock frequency of network insertion from hardware, thus realize the mutual switching of two kinds of networks.If certain network type successful switch, the network equipment is just likely made to receive correct message, if OC48 network, the PPP frame of encapsulation and the processing mode of frame gap also have four kinds of combinations: CRC32 check and scrambler do, CRC16 check and scrambler do, CRC32 and scrambler undo, CRC16 and scrambler undo.If so want the frame after solving encapsulation, the frame after encapsulation comprises ethernet frame and PPP frame, and network maintenance staff must be needed to carry out complicated configuration could be realized, if mis-arrange, then the network equipment can be caused cannot to receive message or receive the situation of error message.
The patent No. be ZL20091002556.9, name is called that the invention of " the adaptive implementation method of a kind of POS port " discloses a kind of network self-adapting cut-in method, but there is following defect in this invention: 1. mate excessive cycle, be 5 ~ 10 seconds, and this kind of duration can bring the loss of mass data; 2. in the method, judge that " SCRAMBLE self adaptation " and " CRC self adaptation " is as precedence relationship, and formulation " SCRAMBLE mistake " has improper part, circuit scrambler does not mate pos interface processing module may be brought to can not find frame head, namely adaptation module can't detect frame also with regard to having said without CRC check correct and wrong, now can not work during its counter; 3. the method does not support the adaptive access function between Ethernet.
Summary of the invention
For overcoming above-mentioned defect, the invention provides a kind of 1G Ethernet and OC48 network self-adapting connecting system and method, carry out any setting without the need to the artificial access to network, if there is optical fiber Plug Action, namely 1G Ethernet and OC48 network are carried out to detection and the adaptation of automation.
For achieving the above object, the invention provides a kind of 1G Ethernet and OC48 network self-adapting connecting system, described connecting system comprises: automatic control device and the optical-electrical converter be connected with described automatic control device, its improvements are, the crystal oscillator able to programme be connected with described automatic control device.
In optimal technical scheme provided by the invention, described automatic control device comprises: iic bus, main control module, serioparallel exchange module serdes, MAC fifo module, MAC PCS module, USER unit, OC48 place in circuit, POS administration module and timeout module; Described main control module, described iic bus are connected successively with described crystal oscillator able to programme; Described serioparallel exchange module serdes, described main control module, described MAC fifo module, described MAC PCS module are connected successively with described USER unit; Described main control module is connected with described OC48 place in circuit and timeout module respectively; Described OC48 place in circuit is connected with described POS administration module, timeout module and described USER unit respectively; Described serioparallel exchange module serdes and described main control module all receive the signallost signal of described optical-electrical converter transmission.
In second optimal technical scheme provided by the invention, described automatic control device employing model is the fpga chip of lx130t; Described crystal oscillator able to programme adopts model to be the chip of CY2XF24.
In 3rd optimal technical scheme provided by the invention, described OC48 place in circuit comprises the POS fifo module, POS layer module and the PPP layer module that connect successively; Described POS layer module is connected with described POS administration module.
In 4th optimal technical scheme provided by the invention, described USER unit comprises: userfifo 0 module, user fifo 1 module and user module; User fifo 0 module respectively with described main control module, MAC PCS module and user model calling; Described user fifo 1 module respectively with described main control module, described PPP layer module and described user model calling.
In 5th optimal technical scheme provided by the invention, described main control module comprises time-out circuit and detection adapts to writing circuit.
In 6th optimal technical scheme provided by the invention, described POS administration module comprises: the configuration file storing four kinds of mode of operations; Described four kinds of mode of operations are respectively: CRC32check and scrambler do, CRC16 check and scrambler do, CRC32 check and scrambler undo and CRC16 check and scrambler undo.
In 7th optimal technical scheme provided by the invention, provide a kind of 1G Ethernet and OC48 network self-adapting cut-in method, its improvements are, described self-adaptive access method comprises the steps:
(1). optical-electrical converter described in automatic detection inputs to the signallost signal of fpga chip, if its value is 1, then continues detection signallost signal, otherwise enters step 2; (2). start described MAC PCS module, as detected, specification allows the comma quantity in error rate situation, then enter step 6, otherwise enter step 3; (3). the frequency of crystal oscillator frequency able to programme is switched to from the reference clock be operated in 1GEthernet network the reference clock be operated under OC48 network; (4). detect the frame delimiting character of OC48 network, if continuous three POS frames all can detect correct frame delimiting character, then enter step 5, otherwise terminate; (5). start described POS administration module, if described OC48 network can match the relevant work pattern in the configuration file of described POS administration module, enter step 6, otherwise terminate; (6). detect signallost signal, if be 0, then terminate, otherwise enter step 1.
In 8th optimal technical scheme provided by the invention, four kinds of mode of operations in described step 5 respectively: CRC32 check and scrambler do, CRC16 check and scrambler do, CRC32 check and scrambler undo and CRC16 check and scrambler undo.
Compared with the prior art, a kind of 1G Ethernet provided by the invention and OC48 network self-adapting connecting system and method, do not need people for carrying out any setting, if there is optical fiber Plug Action, namely 1G Ethernet and OC48 network are carried out to detection and the adaptation of automation, in Millisecond, make the network equipment normally access, and the network type detected, encapsulated frame type and tupe are informed network maintenance staff, reach the object of automation, the defect that the magnanimity avoiding the network data that manual configuration is brought is lost; Moreover, network or the OC48 network of 1Gbps can be detected at Millisecond, and network type result is informed network maintenance staff, if detect unsuccessfully, also have the function of the peripheral connector of indirect detection and network environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of 1G Ethernet and OC48 network self-adapting connecting system.
Fig. 2 is the state machine of governor circuit.
Fig. 3 is the state machine of the detection type of OC48 network.
Embodiment
As shown in Figure 1, be 1G Ethernet and OC48 network self-adapting connecting system, described connecting system comprises: automatic control device and the optical-electrical converter be connected with described automatic control device, the crystal oscillator able to programme be connected with described automatic control device.
Described automatic control device comprises: iic bus, main control module, serioparallel exchange module serdes, MAC fifo module, MAC PCS module, USER unit, OC48 place in circuit, POS administration module and timeout module; Described main control module, described iic bus are connected successively with described crystal oscillator able to programme; Described serioparallel exchange module serdes, described main control module, described MAC fifo module, described MAC PCS module are connected successively with described USER unit; Described main control module is connected with described OC48 place in circuit and timeout module respectively; Described OC48 place in circuit is connected with described POS administration module, timeout module and described USER unit respectively; Described serioparallel exchange module serdes and described main control module all receive the signallost signal of described optical-electrical converter transmission.
Described automatic control device employing model is the fpga chip of lx130t; Described crystal oscillator able to programme adopts model to be the chip of CY2XF24.Described OC48 place in circuit comprises the POS fifo module, POS layer module and the PPP layer module that connect successively; Described POS layer module is connected with described POS administration module.Described USER unit comprises: user fifo 0 module, user fifo 1 module and user module; User fifo 0 module respectively with described main control module, MAC PCS module and user model calling; Described user fifo 1 module respectively with described main control module, described PPP layer module and described user model calling.Described main control module comprises time-out circuit and detection adapts to writing circuit.Described POS administration module comprises: the configuration file storing four kinds of mode of operations; Described four kinds of mode of operations are respectively: CRC32 check and scrambler do, CRC16 check and scrambler do, CRC32 check and scramblerundo and CRC16 check and scrambler undo.
A kind of self-adaptive access method, described self-adaptive access method comprises the steps:
(1). optical-electrical converter described in automatic detection inputs to the signallost signal of fpga chip, if its value is 1, then continues detection signallost signal, otherwise enters step 2; (2). start described MAC PCS module, as detected, specification allows the comma quantity in error rate situation, then enter step 6, otherwise enter step 3; (3). the frequency of crystal oscillator frequency able to programme is switched to from the reference clock be operated in 1GEthernet network the reference clock be operated under OC48 network; (4). detect the frame delimiting character of OC48 network, if continuous three POS frames all can detect correct frame delimiting character, then enter step 5, otherwise terminate; (5). start described POS administration module, if described OC48 network can match the relevant work pattern in the configuration file of described POS administration module, enter step 6, otherwise terminate; (6). detect signallost signal, if be 0, then terminate, otherwise enter step 1.
Four kinds of mode of operations in described step 5 are respectively: CRC32 check and scramblerdo, CRC16 check and scrambler do, CRC32 check and scrambler undo and CRC16 check and scrambler undo.
Fiber-optic signal enters the serdes of the fpga in Fig. 1 after switching electrical signals, and the signal of telecommunication that serdes recovers circuit according to current reference clock frequency becomes the parallel signal of 8bit for fpga internal interface logic.In FIG, the work of circuit starts to depend on optical module and passes to the signallost signal of fpga and the global reset signal of circuit; The crystal oscillator of initial state IIC not in configuration circuit, acquiescence enters detection 1GEthernet network type.
The serdes functions of modules of Fig. 1 is that the 1bit signal of telecommunication is converted to 8bit parallel data, and object reduces the frequency of data accompanying clock, reaches the inner local clock easily realized of fpga.Enter MainCtrl module after conversion, this module is main control module, is the nucleus module of automatic detection circuit, controls progressively carrying out by step above of whole circuit; The data flow of master control module controls 8bit parallel data, enter the detection that MAC fifo or POS fifo carries out two kinds of network types respectively, its State Transferring is shown in Fig. 2; The object of ChangeClk signal is that notice IIC module changes the frequency of programmable crystal oscillator for arranging; CommaDet signal and drawing high of OC48LinkUp signal represent that the frame head of 1GEthernet and OC48 network detects successfully respectively; The data of MAC fifo enter the work that 1GEthernet PCS layer carries out looking for frame head, and the data of POS fifo enter the work that OC48 interface circuit carries out looking for A1, A2.
The function of PosManger module is the detecting function carrying out four kinds of frame type process, and its State Transferring as shown in Figure 3.The redirect of initial condition depends on drawing high of OC48LinkUp, then progressively carries out the detection of A, B, C, D Four types, if time-out, and redirect; If success, carries out success state; If failure, enters failed state and failure reporting is informed network maintenance staff.
1G Ethernet and OC48 network self-adapting cut-in method, realize based on fpga, the advantage of fpga is its online programmable characteristic flexibly, the nanosecond handover network access style when not power down.This circuit also comprises the serioparallel exchange module serdes of a peripheral chip programmable crystal oscillator and fpga inside.The effect of programmable crystal oscillator is available to serdes reference clock makes it work under specified network environment; And the effect of serdes realizes the two-layer function of PMA, PMD, the parallel electric signal forming 8bit difference is exported to gigabit interface core and the OC48 interface core of fpga inside, so that interface kernel subsequent treatment after optical signal prosessing.
Automation control circuit realizes in fpga, realizes comprising an iic bus and a main control module.Iic bus communication target is programmable crystal oscillator, and object is the reference clock frequency that real-time switching crystal oscillator exports to transceiver; The object of main control module adapts to writing circuit by a time-out circuit and a detection and forms, and comprises the following steps:
Step 1), automatic detection electric circuit inspection optical module inputs to the signallost signal of fpga, if its value is 1, then shows that current network interface does not have light signal to input, then rest on step 1; If its value is 0, shows current existing light signal input, then jump to step 2;
Step 2), the frequency of programmable crystal oscillator is 161.1328125Mhz under default situations, namely serdes is operated in the reference clock under 1GEthernet network, from programmable crystal oscillator before step 1 arrives step 2 under this frequency; Step 2 starts detection writing function, if the 1GEthernet 8B/10B module of fpga inside can detect the comma quantity in specification permission error rate situation, then lock detection circuit under 1GEthernet pattern, enter step 9, network type is informed network maintenance staff simultaneously; If time-out circuit cannot lock the comma of 1GEthernet in designated period, then enter step 3;
Step 3), enter step 3 and illustrate that now network insertion type may not be 1GEthernet, and may be OC48; Now start iic bus functional module and switch programmable crystal oscillator to 155.52Mhz, namely serdes is operated in the reference clock under OC48 network, enters step 4 after switching;
Step 4), the object of step 4 detects the frame delimiting character of OC48, comprise 48 continuous print A1 and 48 continuous print A2, if continuous three POS frames all can detect correct frame delimiting character, then enter step 5; Now timeout module is in working order, if cannot find A1, A2 of continuous three frames in designated period, then jumps to step 10;
Step 5), now determined that objective network is OC48, start the detection PPP frame type circuit part of OC48 place in circuit of fpga inside; If transmitting terminal scrambler do pattern, then adaptation module is that scrambler undo pattern then can not find the PPP frame free time, can always in the IDLE state of PPP frame type state machine, so there is the TimeOut process of a local here, the principle of TimeOut plugs optical fiber at every turn or re-power all to carry out once, instead of carry out TimeOut operation when IDLE, can cause intermittent dropping packets action like this, after namely finding a kind of configuration correctly, (above said four kinds of patterns) then enter step 9 at every turn; The mode of operation of step 5 is CRC32 check and scrambler do; The frame long by 700Bytes calculates, and data bit width is 8bit, average every frame about 700 cycle, the i.e. time slot of 2250ns mono-frame, and 1ms is then about 500 frames, if four kinds of patterns are distributed to 10ms, then often kind of situation is 2.5ms i.e. 1250 frames; If confiscate frame in 2.5ms, jump procedure 6, this situation may be that configuration is correct but what receive be all that IDLE or scrambler does not mate; If receive correct frame, enter step 9, network type is informed network maintenance staff simultaneously;
Step 6), this step detection type be CRC16 check and scrambler do; Process and step 5 similar, if confiscate frame in 2.5ms, enter step 7, if receive correct frame, enter step 7, simultaneously network type is informed network maintenance staff;
Step 7), this step detection type be CRC32 check and scrambler undo; Process and step 5 similar, if confiscate frame in 2.5ms, enter step 8, if receive correct frame, enter step 7, simultaneously network type is informed network maintenance staff;
Step 8), this step detection type be CRC16 check and scrambler undo; Process and step 5 similar, if confiscate frame in 2.5ms, enter step 10, if receive correct frame, enter step 7, simultaneously network type is informed network maintenance staff;
Step 9), this step for detection successful terminal, if signallost is 0, then remain on this step always, if signallost is 1, then enter step 1;
Step 10), this step is the failed terminal of detection, failed reason is as follows: 1. not the mating of optical fiber; 2. not the mating of optical module type; 3. optical signal quality does not reach the degree that can normally work; 4. network type is not the type that the present invention supports.
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (6)
1. a 1G Ethernet and OC48 network self-adapting connecting system, described connecting system comprises: automatic control device and the optical-electrical converter be connected with described automatic control device, it is characterized in that, the crystal oscillator able to programme be connected with described automatic control device;
Described automatic control device comprises: iic bus, main control module, serioparallel exchange module serdes, MAC fifo module, MAC PCS module, USER unit, OC48 place in circuit, POS administration module and timeout module; Described main control module, described iic bus are connected successively with described crystal oscillator able to programme; Described serioparallel exchange module serdes, described main control module, described MAC fifo module, described MAC PCS module are connected successively with described USER unit; Described main control module is connected with described OC48 place in circuit and timeout module respectively; Described OC48 place in circuit is connected with described POS administration module, timeout module and described USER unit respectively; Described serioparallel exchange module serdes and described main control module all receive the signallost signal of described optical-electrical converter transmission;
Described automatic control device employing model is the fpga chip of lx130t; Described crystal oscillator able to programme adopts model to be the chip of CY2XF24;
The self-adaptive access method of described 1G Ethernet and OC48 network self-adapting connecting system, comprises the steps:
(1). optical-electrical converter described in automatic detection inputs to the signallost signal of fpga chip, if its value is 1, then continues detection signallost signal, otherwise enters step 2; (2). start described MAC PCS module, as detected, specification allows the comma quantity in error rate situation, then enter step 6, otherwise enter step 3; (3). the frequency of crystal oscillator able to programme is switched to from the reference clock be operated in 1GEthernet network the reference clock be operated under OC48 network; (4). detect the frame delimiting character of OC48 network, if continuous three POS frames all can detect correct frame delimiting character, then enter step 5, otherwise terminate; (5). start described POS administration module, if described OC48 network can match the relevant work pattern in the configuration file of described POS administration module, enter step 6, otherwise terminate; (6). detect signallost signal, if be 0, then terminate, otherwise enter step 1.
2. connecting system according to claim 1, is characterized in that, described OC48 place in circuit comprises the POS fifo module, POS layer module and the PPP layer module that connect successively; Described POS layer module is connected with described POS administration module.
3. connecting system according to claim 2, is characterized in that, described USER unit comprises: user fifo 0 module, user fifo 1 module and user module; User fifo 0 module respectively with described main control module, MAC PCS module and user model calling; Described user fifo 1 module respectively with described main control module, described PPP layer module and described user model calling.
4. connecting system according to claim 1, is characterized in that, described main control module comprises time-out circuit and detection adapts to writing circuit.
5. connecting system according to claim 1, is characterized in that, described POS administration module comprises: the configuration file storing four kinds of mode of operations; Described four kinds of mode of operations are respectively: CRC32check and scrambler do, CRC16check and scrambler do, CRC32check and scrambler undo and CRC16check and scrambler undo.
6. connecting system according to claim 1, it is characterized in that, relevant work pattern in described step 5 has four kinds, respectively: CRC32check and scrambler do, CRC16check and scrambler do, CRC32check and scrambler undo and CRC16check and scrambler undo.
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| CN110597748B (en) * | 2019-07-31 | 2021-09-07 | 北京航天时代光电科技有限公司 | TLK 2711-based high-speed communication interface and data processing system |
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| CN1507209A (en) * | 2002-12-10 | 2004-06-23 | 深圳市中兴通讯股份有限公司 | Gigabit Ethernet data service access device |
| CN102244662A (en) * | 2011-07-21 | 2011-11-16 | 曙光信息产业股份有限公司 | Data distribution platform of blade server |
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| CN1507209A (en) * | 2002-12-10 | 2004-06-23 | 深圳市中兴通讯股份有限公司 | Gigabit Ethernet data service access device |
| CN102244662A (en) * | 2011-07-21 | 2011-11-16 | 曙光信息产业股份有限公司 | Data distribution platform of blade server |
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