CN202034986U - Two-channel full-redundancy serial interface, optical tranceiver and system - Google Patents
Two-channel full-redundancy serial interface, optical tranceiver and system Download PDFInfo
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- CN202034986U CN202034986U CN2011200873669U CN201120087366U CN202034986U CN 202034986 U CN202034986 U CN 202034986U CN 2011200873669 U CN2011200873669 U CN 2011200873669U CN 201120087366 U CN201120087366 U CN 201120087366U CN 202034986 U CN202034986 U CN 202034986U
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Abstract
The utility model relates to a two-channel full-redundancy serial interface, an optical transceiver and a system, in particular to the two-channel full-redundancy serial interface. The optical transceiver and the system can be obtained by correspondingly causing short circuit of a serial bus of the interface and expanding the serial bus of the interface. A control circuit is correspondingly arranged on the serial interface to increase control enable signals for a transmission driver of the serial interface. When two channels of signals are both effective or ineffective, the two corresponding control enable signals are both effective. When one of the two channels of signals are fault or free, the other one of the two channels of signals are effective, the control enable signals of the fault or the free channel are ineffective, and the control enable signals of the effective channel are effective. Therefore, the two-channel full-redundancy serial interface, the optical transceiver and the system are capable of automatically shielding ineffective transmission channels and avoiding transmission error codes, thereby realizing real full-redundancy transmission.
Description
Technical field
The utility model relates to serial signal redundant transmission field, the interface of the automatic full redundancy transparent transmission of two-way serial signal particularly, and the optical transceiver and the optical transmission system that adopt this interface.
Background technology
About the redundant transmission of serial signal, realize that at present the technology of two-way serial signal redundant transmission mainly contains following 3 kinds, all be example with RS422:
A) pseudo-redundant fashion
As Fig. 1, two-way RS422 signal is respectively by optical transceiver 1(optical transceiver 2) be converted to light signal, arrive optical transceiver 3(optical transceiver 4 by Optical Fiber Transmission), be converted to the RS422 signal again, be connected to one " 2 close 1 equipment ".Optical transceiver is the equipment that light signal is changed into electric signal, to not influence of transparent transmission.
This mode has two-way RS422 signal transmission, optical transceiver 3(optical transceiver 4) the RS422 signal of output all is connected to " 2 close 1 equipment ", and this equipment is with synthetic one road signal of two paths of signals; Wherein " 2 close 1 equipment " remains the single-point equipment in the transmission of RS422 signal, and whole link does not form whole two redundancies, therefore is called pseudo-redundant fashion.Then whole transmission link interrupts this redundant fashion line if " 2 close 1 equipment " breaks down.
B) redundant fashion of protocol conversion
Implementation as shown in Figure 2, be different with Fig. 1 is provided with protocol converter between RS422 signal and the optical transceiver.In this mode the RS422 signal is carried out protocol conversion.
The agreement that for example is converted to Ethernet is transmitted, and realizes the redundant transmission of RS422 signal by some characteristics of Ethernet.Though the also reasonable redundant transmission that realizes the RS422 signal of this kind implementation, the scheme complexity realizes the cost height.Because the non real-time transmission of Ethernet may cause the RS422 signal transmission delay that real-time is had relatively high expectations to increase and be uncontrollable.In addition, need handle the packet of RS422 when realizing protocol conversion, identify payload user data, need know the frame format of RS422, therefore can't carry out complete transparent transmission the RS422 signal.
C) software or manually operated redundant fashion
Implementation is that with the difference of Fig. 1 this mode has substituted " 2 close 1 equipment " among Fig. 1 with switch as shown in Figure 3.
This mode is overlapped independently single channel RS422 optical transmission chain by two and is formed the state of being judged every link by software or operating personnel, and control switch switches to wherein one the tunnel.If then can not be called automatic redundancy by manual switching, if then increased the complexity of product equally, reduce reliability, and switch is single-point equipment equally with software control, not fully redundance.
Be illustrated in figure 4 as the current a kind of redundant fashion that can realize, A-C wherein, B-D two-way are RS422 communication modes independently.But between data terminal A, B and data terminal C, D, do not get in touch.If a certain data terminal is an equipment, promptly to merge two-way full redundancy serial signal, prior art obviously is helpless.
The utility model content
The purpose of this utility model provides a kind of two-way full redundancy serial line interface, optical transceiver and system, can not merge the problem that the two-way serial signal carries out the full redundancy transmission in order to solve prior art.
For achieving the above object, scheme of the present utility model is: two-way full redundancy serial line interface, comprise the serial line interface that two-way is separate, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
Further, described control circuit comprises one or Men Yuyi not gate, or gate output terminal connects the output of described control circuit, or an input of door is connected to the output of not gate, the input of not gate connects the first input end of described control circuit, or another input of door is connected to second input of described control circuit.
Further, the corresponding short circuit of the transmission output end of driver of described two-way serial line interface, the also corresponding short circuit of input of reception driver.
Further, described serial line interface meets RS422, RS485 or RS232 standard.
Another kind of scheme of the present utility model is: a kind of two-way full redundancy optical transceiver, comprise two opto-electronic conversion interfaces, the electrical side of each opto-electronic conversion interface all is connected with serial line interface, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
Further, described control circuit comprises one or Men Yuyi not gate, or gate output terminal connects the output of described control circuit, or an input of door is connected to the output of not gate, the input of not gate connects the first input end of described control circuit, or another input of door is connected to second input of described control circuit.
Further, the corresponding short circuit of the transmission output end of driver of described two-way serial line interface, the also corresponding short circuit of input of reception driver.
Further, described serial line interface meets RS422, RS485 or RS232 standard.
Another scheme of the present utility model is: the automatic full redundancy transparent optical of a kind of two-way transmission system, comprise two two-way full redundancy optical transceivers, every optical transceiver includes two opto-electronic conversion interfaces, the electrical side of each opto-electronic conversion interface all is connected with serial line interface, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
The light signal side of two opto-electronic conversion interfaces of a two-way full redundancy optical transceiver is by the corresponding respectively light signal side that connects two opto-electronic conversion interfaces of another optical transceiver of optical cable; The corresponding short circuit of the transmission output end of driver of the two-way serial line interface of described every optical transceiver, the also corresponding short circuit of input of reception driver.
Further, described serial line interface meets RS422, RS485 or RS232 standard.
The core of three kinds of schemes of the present utility model is two-way full redundancy serial line interface, by with the corresponding short circuit of this interface universal serial bus, and expansion, can obtain optical transceiver and system.By described control circuit, be a control of the transmission driver increase enable signal of serial line interface, when two paths of signals was all effective, two corresponding control enable signals were all effective; When two paths of signals fault or when idle, two control enable signals are also all effective all; One tunnel fault or free time in the two paths of signals, when another road was effective, the control enable signal on fault or idle road was invalid, and effectively the control enable signal on road is effective.So this two-way full redundancy serial line interface, optical transceiver and system can shield invalid transmission channel automatically, can not cause transmission error code, realize real full redundancy transmission; Not by other single-point equipment and other protocol conversion devices, transmission real-time be transparent transmission completely, and this method servicing unit is few, and it is convenient to realize, cost is low, the reliability height.
Description of drawings
Fig. 1 is pseudo-redundant fashion schematic diagram;
Fig. 2 is a protocol conversion redundant fashion schematic diagram;
Fig. 3 is a control redundancy mode schematic diagram;
Fig. 4 is a two-way independent communication mode schematic diagram;
Fig. 5 is direct short circuit RS422 signal circuit diagram;
Fig. 6 is the control circuit figure that produces enable signal;
Fig. 7 is the schematic diagram of bilateral merging mode;
Fig. 8 is the schematic diagram of monolateral merging mode;
Fig. 9 is the schematic diagram of independent transmission mode;
Figure 10 is a RS422 standard light terminal;
Figure 11 is a RS485 standard light terminal;
Figure 12 is a RS232 standard light terminal;
DA is the serial data of circuit board A, and DB is the serial data of circuit board B, and " G " expression sends driver, and " R " expression receives driver, and ENA is the control enable signal of circuit board A, and ENB is the control enable signal of circuit board B.
Embodiment
Below in conjunction with accompanying drawing method of the present utility model is further described in detail.Embodiment is an example with the RS422 standard all, and RS485, RS232 standard can directly be applied mechanically, and repeat no more.
Serial line interface embodiment
The key technology of two-way RS422 redundancy is how two independent RS422 signal directly not to be influenced performance index with lead with the same signal short circuit in this patent.Do not carrying out under the situation of any processing, if direct short circuit RS422 bus, as shown in Figure 5, when circuit board A transmits effective level "0" and circuit board when passing the RS422 signal short circuit of the defeated idle level"1" of B and two circuit boards, can't obtain effective level "0" on the final RS422 bus, cause transmission error code.
We have added control circuit (be the control circuit of circuit board A among Fig. 6, the structure of overall optical terminal as shown in figure 10) as Fig. 6 in circuit in order to realize above-mentioned key technology.ENA receives the corresponding Enable Pin that sends driver with ENB.Allow the RS422 signal output of circuit board A when ENA=" 1 ", make the RS422 signal of circuit board A be output as high-impedance state when ENA=" 0 "; In like manner, allow the RS422 signal output of circuit board B when ENB=" 1 ", make the RS422 signal of circuit board B be output as high-impedance state when ENB=" 0 ", can make two circuit board co-ordinations, can make two independently direct short circuits of RS422 interface by control circuit.
Signal demand between circuit board A and the circuit board B sends to the other side, because the ground of the reference between A plate and B plate isolates mutually, therefore between two boards, carry out the reference level signal of signal itself also to be transmitted when signal is interconnected, and on an other plate, take the coupling measure, signal is carried out the reference level conversion.As shown in the figure, be equipped with the optocoupler that is used for the isolation coupling signal on every block of plate.
We can obtain following truth table (is example with the A plate) by Fig. 6 circuit:
| DA | DB | ENA |
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
By truth table as can be known only when DA=" 1 " and the DB=" 0 ", A plate RS422 signal output high-impedance state.
That two circuit boards are formed is redundant, during backup transmission system, according to above-mentioned truth table, the operation principle of Fig. 7 circuit is described as follows.At first we understand a rule of RS422 bus earlier: bus signals was a high level when bus was idle.When DA=DB=" 0 ", what we judged A and the transmission of B plate all is effective RS422 signal, makes the EN of A, B two boards be " 1 ", can both normally export the RS422 signal; When DA=" 0 " and DB=" 1 ", be judged as the A plate and transmit effective RS422 signal, and the B plate is in free time or malfunction, therefore, and the ENA=of A plate " 1 ", the ENB=of B plate " 0 ", only the A plate can normally be exported the RS422 signal; When DA=" 1 " and DB=" 0 ", be judged as the B plate and transmit effective RS422 signal, and the A plate is in free time or malfunction, therefore, and the ENA=of B plate " 1 ", the ENB=of A plate " 0 ", only the B plate can normally be exported the RS422 signal; When DA=DB=" 1 " is judged as two-way all is that idle condition, malfunction or RS422 transmit " 1 " signal really, but the sort of situation no matter, even the EN of A plate and B plate is the transmission that " 1 " does not influence final RS422 signal yet, therefore make the EN of A plate and B plate be " 1 " this moment.As can be known no matter under the sort of situation, can both make RS422 signal normal transmission by above-mentioned analysis explanation.
Optical transceiver circuit diagram of the present utility model such as Figure 10, Figure 11, shown in Figure 12, they are respectively for RS422, and RS485 and RS232 have all omitted ground wire among three figure, and Figure 12 has omitted control circuit.
Be the tectonic relationship that example specifies two-way full redundancy serial line interface below with Figure 10.
Two-way full redundancy serial line interface, comprise the two independent serial line interface, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with control circuit, this control circuit includes first input end, two inputs of second input and an output, described output connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
, as shown in Figure 6; As a kind of simple implementation of this control circuit: the control circuit on every road includes one or Men Yuyi not gate; Or the output of door connects the Enable Pin that this road sends driver, or an input of door connects the output of not gate, the input of not gate connects the input that this road sends driver, or another input of door connects the input that another road sends driver by optocoupler.
Optical transceiver embodiment
As Figure 10, on the basis of above-mentioned serial line interface, connect photoelectric conversion device in the data side of serial line interface and can obtain two-way full redundancy optical transceiver.Notice that this optical transceiver is different with the optical transceiver of Fig. 1-4 to be, it has two identical photoelectric conversion devices (opto-electronic conversion interface in other words).Each optical transceiver can provide separate two RS422 electrical interfaces and two groups of optical interfaces, and circuit board A and circuit board B in the optical transceiver are identical, and every circuit board all can be finished the Optical Fiber Transmission function of RS422 signal separately.
System embodiment
Two-way full redundancy transparent optical transmission system such as Fig. 7, shown in Figure 10, this mode is bilateral merging working method.Optical transceiver is the optical transceiver among the above-mentioned optical transceiver embodiment among the figure.Directly with lead identical signal short circuit is merged into a RS422 interface in the electrical side of optical transceiver outside as shown in figure 10, promptly the light signal side of two opto-electronic conversion interfaces of a two-way full redundancy optical transceiver is by the corresponding respectively light signal side that connects two opto-electronic conversion interfaces of another optical transceiver of optical cable; The corresponding short circuit of the transmission output end of driver of the two-way serial line interface of described every optical transceiver, the also corresponding short circuit of input of reception driver, two optical transceivers connect and connect two data terminals respectively behind the short circuit.
So long as not two optical communication link simultaneous faultss, then the RS422 signal can both normal transmission to the destination data end; Realize the automatic full redundancy transparent optical of two-way RS422 transfer function fully.Under this kind working method, set up the RS422 communication link of a fully redundance at two data terminal rooms, but its use is the same convenient with a common RS422 optical communication link.
Except bilateral merging mode, communication mode (Fig. 8) and two independent RS422 communication mode (Fig. 9 of also having monolateral merging RS422, in fact the prior art with Fig. 4 is identical, and the signal that has cut off between A plate and B plate is interconnected, and making does not have mutual coordination control between them).
Claims (10)
1. two-way full redundancy serial line interface, comprise the serial line interface that two-way is separate, every road serial line interface includes and receives driver and send driver, it is characterized in that, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
2. two-way full redundancy serial line interface according to claim 1, it is characterized in that, described control circuit comprises one or Men Yuyi not gate, or gate output terminal connects the output of described control circuit, or an input of door is connected to the output of not gate, the input of not gate connects the first input end of described control circuit, or another input of door is connected to second input of described control circuit.
3. two-way full redundancy serial line interface according to claim 1 is characterized in that, the corresponding short circuit of the transmission output end of driver of described two-way serial line interface, the also corresponding short circuit of input of reception driver.
4. two-way full redundancy serial line interface according to claim 1 is characterized in that described serial line interface meets RS422, RS485 or RS232 standard.
5. two-way full redundancy optical transceiver, it is characterized in that, comprise two opto-electronic conversion interfaces, the electrical side of each opto-electronic conversion interface all is connected with serial line interface, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
6. two-way full redundancy optical transceiver according to claim 5, it is characterized in that, described control circuit comprises one or Men Yuyi not gate, or gate output terminal connects the output of described control circuit, or an input of door is connected to the output of not gate, the input of not gate connects the first input end of described control circuit, or another input of door is connected to second input of described control circuit.
7. two-way full redundancy optical transceiver according to claim 5 is characterized in that, the corresponding short circuit of the transmission output end of driver of described two-way serial line interface, the also corresponding short circuit of input of reception driver.
8. two-way full redundancy optical transceiver according to claim 5 is characterized in that described serial line interface meets RS422, RS485 or RS232 standard.
9. the automatic full redundancy transparent optical of two-way transmission system, it is characterized in that, comprise two two-way full redundancy optical transceivers, every optical transceiver includes two opto-electronic conversion interfaces, the electrical side of each opto-electronic conversion interface all is connected with serial line interface, every road serial line interface includes and receives driver and send driver, every road serial line interface is equipped with a control circuit, the control circuit on every road includes first input end, two inputs of second input and an output, the output of described control circuit connects an Enable Pin of the transmission driver on this road, first input end connects the transmission driver input end on this road, and second input connects the input of the transmission driver on another road by optocoupler; The output end signal of above-mentioned control circuit, first input end signal, second input end signal are designated as respectively: Z, X, Y, control circuit realize that logic is:
The light signal side of two opto-electronic conversion interfaces of a two-way full redundancy optical transceiver is by the corresponding respectively light signal side that connects two opto-electronic conversion interfaces of another optical transceiver of optical cable;
The corresponding short circuit of the transmission output end of driver of the two-way serial line interface of described every optical transceiver, the also corresponding short circuit of input of reception driver.
10. the automatic full redundancy transparent optical of a kind of two-way according to claim 9 transmission system is characterized in that described serial line interface meets RS422, RS485 or RS232 standard.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200873669U CN202034986U (en) | 2011-03-29 | 2011-03-29 | Two-channel full-redundancy serial interface, optical tranceiver and system |
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|---|---|---|---|
| CN2011200873669U CN202034986U (en) | 2011-03-29 | 2011-03-29 | Two-channel full-redundancy serial interface, optical tranceiver and system |
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| CN202034986U true CN202034986U (en) | 2011-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142900A (en) * | 2011-03-29 | 2011-08-03 | 中航光电科技股份有限公司 | Double-way fully-redundant serial interface, optical transmitter and receiver, and system |
-
2011
- 2011-03-29 CN CN2011200873669U patent/CN202034986U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142900A (en) * | 2011-03-29 | 2011-08-03 | 中航光电科技股份有限公司 | Double-way fully-redundant serial interface, optical transmitter and receiver, and system |
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