CN101771467A - Method for mesuring asymmetry of optical fiber, device and system - Google Patents
Method for mesuring asymmetry of optical fiber, device and system Download PDFInfo
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Abstract
The invention discloses a method for mesuring the asymmetry of an optical fiber, a device and a system, which belong to the field of optical fiber communication and aim to solve the problems of the prior art such as inaccurate measurement of the length of the optical fiber, thereby affecting the mesuring of the asymmetry of the optical fiber. The method provided by the embodiment of the invention comprises the following steps: carrying out delay tests through message interaction with opposite communication terminals respectively in a transmitting link and a receiving link so as to obtain the transmission delays of the transmitting link and the receiving link; and calculating the difference of the transmission delays of the transmitting link and the receiving link, so as to obtain the asymmetry value of the transmitting link and the receiving link. The invention is applicable to the optical fiber communication system.
Description
Technical field
The present invention relates to fiber optic communication field, relate in particular to the methods, devices and systems that a kind of optical fiber asymmetry is measured.
Background technology
The IEEE1588V2 agreement is a kind of frequency time synchronization protocol, in modern communication networks, the business that real-time is had relatively high expectations has proposed very high requirement for whole communication network Frequency Synchronization even time synchronized, wherein Frequency Synchronization is the basis of time synchronized, because had only Frequency Synchronization, the precision of the stepping of time just may guarantee unanimity, just might realize time synchronized.IEEE1588V2 is the precision interval clock synchronous protocol standard of network measure and control system, is called for short the PTP agreement.Adopt PTP (chronometer time agreement) agreement, precision can reach the microsecond level.The purpose of this standard be for accurately disperse, the clock synchronization of independent operating.
For each communication node, optical fiber link has two, receives link and one link for one.1588 agreements realize that prerequisite is: the time of the receiving-transmitting chain transmission data of optical fiber must be isometric, not isometric will the adjustment to transmission policy, otherwise inconsistent timing tracking accuracy is existed of time of optical fiber receiving-transmitting chain transmission data seriously influences.So just need to measure the asymmetry of receiving link fiber and sending out link fiber.
Existing a kind of method of measuring the optical fiber asymmetry is: launch light pulse from an end of testing fiber to the other end, and the light signal that adopts optical time domain reflectometer reception reflection and scattering to return, from transmitting signals to the used time of inverse signal, determine the speed of light in glass substance again, just can calculate distance, just fiber lengths is finally calculated the optical fiber asymmetry by measuring the length of receiving link fiber and sending out link fiber respectively.
State in realization in the process of optical fiber length measuring, the inventor finds that there are the following problems at least in the prior art: be subjected to the influence of optical fiber processing technology, optical fiber is if by two short fused fiber splices, can be affected at the light signal that inside of optical fibre reflects and scattering is returned, make the measurement of fiber lengths inaccurately, and then influence is to the measurement of optical fiber asymmetry.
Summary of the invention
The methods, devices and systems that embodiments of the invention provide a kind of optical fiber asymmetry to measure, measuring optical fiber asymmetry more exactly.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The method that a kind of optical fiber asymmetry is measured comprises:
Sending out link and receiving in the link and carry out the delay test of local terminal and Correspondent Node respectively by the form of message interaction, and then the transmission delay of must set out link and receipts link;
Poor with sending out link and receiving the transmission delay of link, obtain the asymmetry value of receiving-transmitting chain.
The device that a kind of optical fiber asymmetry is measured comprises:
The transmission delay computing unit: be used for sending out link and receiving link and carry out the delay test of local terminal and Correspondent Node respectively by the form of message interaction, and then the transmission delay of must set out link and receipts link;
The asymmetry computing unit: it is poor to be used for the transmission delay of sending out link and receipts link, obtains the asymmetry value of receiving-transmitting chain.
The system that a kind of optical fiber asymmetry is measured comprises: simplex optical module, measurement module and computing module, wherein,
Simplex optical module: be used for also receiving from the message of receiving a link and a link to receiving link and sending out link transmission message;
Measurement module: be used to generate the message that simplex optical module sends, handle from the message of receiving a link and a link, and the transmitting-receiving time of record test packet and test response message;
Computing module: be used for sending out the transmission delay of link and receipts link, and then calculate the asymmetry value of receiving-transmitting chain according to the transmitting-receiving Time Calculation of test packet and test response message.
The methods, devices and systems that the optical fiber asymmetry that the embodiment of the invention provides is measured, based on optical transmission principles rather than light reflection principle, can effectively avoid the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry.
Description of drawings
Fig. 1 is the flow chart of an embodiment of optical fiber asymmetry method of measurement of the present invention;
Fig. 2 is the flow chart of another embodiment of optical fiber asymmetry method of measurement of the present invention;
Fig. 3 is the flow chart of another embodiment of optical fiber asymmetry method of measurement of the present invention;
Fig. 4 is the structural representation of an embodiment of optical fiber asymmetry measurement mechanism of the present invention;
Fig. 5 is the structural representation of another embodiment of optical fiber asymmetry measurement mechanism of the present invention;
Fig. 6 is the another kind of structural representation of transmission delay computing unit among another embodiment of optical fiber asymmetry measurement mechanism of the present invention;
Fig. 7 is the structural representation of an embodiment of optical fiber asymmetry measuring system of the present invention;
Fig. 8 is the structural representation of another embodiment of optical fiber asymmetry measuring system of the present invention.
Embodiment
For each optical fiber communication node, optical fiber link has two, receives link and one link for one.The embodiment of the invention is delayed time by the optical transmission principles measuring optical fiber, and then measures the asymmetry of transmission delay between the receiving-transmitting chain.
The methods, devices and systems of embodiment of the invention optical fiber asymmetry being measured below in conjunction with accompanying drawing are described in detail.
An embodiment of optical fiber asymmetry method of measurement of the present invention comprises as shown in Figure 1:
S101, sending out link and receiving in the link and carry out delay test by message interaction respectively with Correspondent Node, and then the link and receive the transmission delay of link of must setting out.
S102, will send out link and receive the transmission delay of link poor, obtain the asymmetry value of receiving-transmitting chain.
Present embodiment can effectively be avoided the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry based on optical transmission principles rather than light reflection principle.
Another embodiment of optical fiber asymmetry method of measurement of the present invention comprises as shown in Figure 2:
Whether S201, to detect this end system normal, if this end system normally carries out next step delay test, otherwise report and alarm.
This step mainly is to carry out System self-test, with test macro reliability before delay test.
S202, local terminal send test packet to Correspondent Node, and in local terminal record transmitting time.
The test response message that S203, local terminal received communication opposite end are returned, record test response message arrives the time of local terminal, and the test packet that carries in the test response message arrives the temporal information of Correspondent Node and the temporal information that Correspondent Node sends the test response message.
Step S202 and S203 are that present embodiment is the process that carrier carries out the optical transmission test with the message, and purpose is the transmission delay that obtains between local terminal and the Correspondent Node.Local terminal sends test packet to Correspondent Node, write down the transmitting time of described test packet simultaneously at local terminal, after Correspondent Node is received test packet, can write down the time that test packet arrives Correspondent Node, by the test response message time that test packet arrives Correspondent Node be informed local terminal then.The time that arrives Correspondent Node with test packet deducts the transmitting time of test packet, local terminal just obtained and Correspondent Node between transmission delay.But this process is unidirectional (from local terminal island Correspondent Node), whether reverse transfer also is that this time-delay be can not determine in optical fiber, so, among the step S203, Correspondent Node is when returning the test response message to local terminal, the transmitting time of test response message also is recorded in this test response message, corresponding, local terminal can write down the time of receiving the test response message.
S204, deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay.
S205, deduct test response message transmitting time the time of advent with the test response message and obtain the time-delay of test response message transmissions.
S206, add test response message transmissions time-delay, remove 2 again, obtain the link transmission time-delay with the test packet transmission delay.
S207, will send out link and receive the transmission average retardation of link poor, obtain the asymmetry value of receiving-transmitting chain.
Present embodiment sends test packet by an end of optical fiber (receive link and send out a link) to the other end, receives the test response message that the other end returns, and then draws the transmission delay that optical fiber passes through by the transmitting-receiving time difference of message.After drawing the transmission delay of receiving a link fiber and a link fiber respectively, further calculate the asymmetry value of receiving-transmitting chain.Because embodiment of the invention utilization is optical transmission principles rather than light reflection principle, can effectively avoid the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry.
Another embodiment of optical fiber asymmetry method of measurement of the present invention comprises as shown in Figure 3:
Whether S301, to detect this end system normal, if this end system normally carries out next step delay test, otherwise report and alarm.
Present embodiment is that with the main distinction of a last embodiment local terminal and Correspondent Node are by the implementation that message interaction carries out delay test different (S302-S305).
Whether S302, comparison local terminal system time attribute are better than Correspondent Node system time attribute, if, local terminal is made as main end, Correspondent Node is made as from end; If not, local terminal is made as from end, Correspondent Node is made as main end.
The attribute that local terminal and Correspondent Node are compared comprises: priority, port address value, at least one in the clock value.
S303, receive the test packet that main end sends from termination, the record test packet arrives the temporal information that the main end that carries sends test packet from the time of end and test packet.
S304, send the test response message and write down the transmitting time of test response message to main end from end.
S305, receive the answer message of the test response message that main end sends, write down the temporal information that the test response message that carries in the described answer message arrives main end from termination.
S306, deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay.
S307, deduct test response message transmitting time the time of advent with the test response message and obtain the time-delay of test response message transmissions.
S308, add test response message transmissions time-delay, remove 2 again, obtain the link transmission time-delay with the test packet transmission delay.
S309, will send out link and receive the transmission average retardation of link poor, obtain the asymmetry value of receiving-transmitting chain.
Present embodiment sends test packet by an end of optical fiber to the other end, receives the test response message that the other end returns, and then draws the transmission delay that optical fiber passes through by the transmitting-receiving time difference of message.After drawing the transmission delay of receiving a link fiber and a link fiber respectively, further calculate the asymmetry value of receiving-transmitting chain.Because embodiment of the invention utilization is optical transmission principles rather than light reflection principle, can effectively avoid the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry.
An embodiment of optical fiber asymmetry measurement mechanism of the present invention comprises as shown in Figure 4:
Transmission delay computing unit 1: be used for sending out link and receiving link and carry out delay test by message interaction respectively with Correspondent Node, and then the transmission delay of must set out link and receipts link.
Asymmetry computing unit 2: it is poor to be used for the transmission delay of sending out link and receipts link, obtains the asymmetry value of receiving-transmitting chain.
Present embodiment can effectively be avoided the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry based on optical transmission principles rather than light reflection principle.
Another embodiment of optical fiber asymmetry measurement mechanism of the present invention comprises as shown in Figure 5:
Transmission delay computing unit 1: be used for sending out link and receiving link and carry out delay test by message interaction respectively with Correspondent Node, and then the transmission delay of must set out link and receipts link.
Asymmetry computing unit 2: it is poor to be used for the transmission delay of sending out link and receipts link, obtains the asymmetry value of receiving-transmitting chain.
Whether detecting unit 3: it is normal to detect this end system, if this end system normally carries out next step delay test, otherwise report and alarm.
Wherein, transmission delay computing unit 1 comprises:
Test packet sends subelement 11: is used for sending test packet to Correspondent Node, and in local terminal record transmitting time.
The test response message receives subelement 12: be used for the test response message that returns the received communication opposite end, record test response message arrives the time of local terminal, and the test packet that carries in the test response message arrives the temporal information of Correspondent Node and the temporal information that Correspondent Node sends the test response message.
Test packet transmission delay computation subunit 13: deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay.
Test response message transmissions time-delay computation subunit 14: deduct test response message transmitting time the time of advent with the test response message and obtain the test response message transmissions and delay time.
Link transmission time-delay computation subunit 15: add the time-delay of test response message transmissions with the test packet transmission delay, remove 2 again, obtain the link transmission time-delay.
Perhaps, transmission delay computing unit 1 comprises as shown in Figure 6:
Attribute is subelement 16 relatively: is used for comparison local terminal system time attribute and whether is better than Correspondent Node system time attribute, if, local terminal is made as main end, Correspondent Node is made as from end; If not, local terminal is made as from end, Correspondent Node is made as main end.
Receive subelement 17 from the end test packet: be used to receive the test packet that main end sends, the record test packet arrives the temporal information that the main end that carries sends test packet from the time of end and test packet.
Send subelement 18 from end test response message: be used for to the main transmitting time that sends the test response message and write down the test response message of holding.
Reply message from end and receive subelement 19: be used to receive the main answer message of holding the test response message that sends, write down the temporal information that the test response message that carries in the described answer message arrives main end.
Test packet transmission delay computation subunit 13: deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay.
Test response message transmissions time-delay computation subunit 14: deduct test response message transmitting time the time of advent with the test response message and obtain the test response message transmissions and delay time.
Link transmission time-delay computation subunit 15: add the time-delay of test response message transmissions with the test packet transmission delay, remove 2 again, obtain the link transmission time-delay.
Present embodiment sends test packet by an end of optical fiber to the other end, receives the test response message that the other end returns, and then draws the transmission delay that optical fiber passes through by the transmitting-receiving time difference of message.After drawing the transmission delay of receiving a link fiber and a link fiber respectively, further calculate the asymmetry value of receiving-transmitting chain.Because embodiment of the invention utilization is optical transmission principles rather than light reflection principle, can effectively avoid the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry.
An embodiment of optical fiber asymmetry measuring system of the present invention comprises as shown in Figure 7: simplex optical module 7, measurement module 8 and computing module 9, wherein,
Simplex optical module 7: be used for also receiving from the message of receiving a link and a link to receiving link and sending out link transmission message.
Measurement module 8: be used to generate the message that simplex optical module sends, handle from the message of receiving a link and a link, and the transmitting-receiving time of record test packet and test response message.
Computing module 9: be used for sending out the transmission delay of link and receipts link, and then calculate the asymmetry value of receiving-transmitting chain according to the transmitting-receiving Time Calculation of test packet and test response message.
Present embodiment can effectively be avoided the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry based on optical transmission principles rather than light reflection principle.
Another embodiment of optical fiber asymmetry measuring system of the present invention comprises as shown in Figure 8: simplex optical module 7, measurement module 8 and computing module 9, wherein,
Simplex optical module 7: be used for also receiving from the message of receiving a link and a link to receiving link and sending out link transmission message.
Measurement module 8: be used to generate the message that simplex optical module sends, handle from the message of receiving a link and a link, and the transmitting-receiving time of record test packet and test response message.
Computing module 9: be used for sending out the transmission delay of link and receipts link, and then calculate the asymmetry value of receiving-transmitting chain according to the transmitting-receiving Time Calculation of test packet and test response message.
Wherein, described measurement module 8 comprises:
Clock submodule 81: be used to produce system clock.
Message generates submodule 82: be used to generate the message that simplex optical module sends.
Message processing sub 83: be used to handle message from receiving a link and a link.
Timing submodule 84: be used to utilize the system clock of clock submodule generation, record generates submodule and the test packet of message processing sub and the transmitting-receiving time of test response message from message.
In addition, native system can also comprise:
Human-computer interaction module 10: be used to receive user's inquiry, and show the Query Result of the asymmetry value that comprises receiving-transmitting chain to the user.
Present embodiment sends test packet by an end of optical fiber (receive link and send out a link) to the other end, receives the test response message that the other end returns, and then draws the transmission delay that optical fiber passes through by the transmitting-receiving time difference of message.After drawing the transmission delay of receiving a link fiber and a link fiber respectively, further calculate the asymmetry value of receiving-transmitting chain.Because embodiment of the invention utilization is optical transmission principles rather than light reflection principle, can effectively avoid the influence of optical fiber processing technology light reflex and scattered signal, exactly the measuring optical fiber asymmetry.
In addition, in order to overcome the influence of systematic error, can will receive link and send out simplex optical module link-attached and exchange, carry out one-shot measurement again, the results averaged of twice measurement at local terminal or Correspondent Node to measuring.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1. the method that the optical fiber asymmetry is measured is characterized in that, comprising:
Sending out link and receiving in the link and carry out the delay test of local terminal and Correspondent Node respectively by the form of message interaction, and then the transmission delay of must set out link and receipts link;
Poor with sending out link and receiving the transmission delay of link, obtain the asymmetry value of receiving-transmitting chain.
2. method according to claim 1 is characterized in that, the step of carrying out the delay test of local terminal and Correspondent Node by the form of message interaction comprises:
Send test packet to Correspondent Node, and in local terminal record transmitting time;
The test response message that the received communication opposite end is returned, record test response message arrives the time of local terminal, and the test packet that carries in the test response message arrives the temporal information of Correspondent Node and the temporal information that Correspondent Node sends the test response message.
3. method according to claim 1 is characterized in that, the step of carrying out the delay test of local terminal and Correspondent Node by the form of message interaction comprises:
Relatively whether local terminal system time attribute is better than Correspondent Node system time attribute, if, local terminal is made as main end, Correspondent Node is made as from end; If not, local terminal is made as from end, Correspondent Node is made as main end;
Receive the test packet that main end sends from termination, the record test packet arrives the temporal information that the main end that carries sends test packet from the time of end and test packet;
Hold the transmitting time that sends the test response message and write down the test response message to the master from end;
Receive the main answer message of holding the test response message that sends from termination, write down the temporal information that the test response message that carries in the described answer message arrives main end.
4. method according to claim 1 is characterized in that, the step of the transmission delay of must set out link and receipts link comprises:
Deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay;
Deduct test response message transmitting time the time of advent with the test response message and obtain the time-delay of test response message transmissions;
Add the time-delay of test response message transmissions with the test packet transmission delay, remove 2 again, obtain the link transmission time-delay.
5. method according to claim 1 is characterized in that, send out link and receive carry out delay test in the link before, also comprise:
Whether detect this end system normal, if this end system normally carries out next step delay test, otherwise report and alarm.
6. the device that the optical fiber asymmetry is measured is characterized in that, comprising:
The transmission delay computing unit: be used for sending out link and receiving link and carry out the delay test of local terminal and Correspondent Node respectively by the form of message interaction, and then the transmission delay of must set out link and receipts link;
The asymmetry computing unit: it is poor to be used for the transmission delay of sending out link and receipts link, obtains the asymmetry value of receiving-transmitting chain.
7. device according to claim 6 is characterized in that, the transmission delay computing unit comprises:
Test packet sends subelement: is used for sending test packet to Correspondent Node, and in local terminal record transmitting time;
The test response message receives subelement: be used for the test response message that returns the received communication opposite end, record test response message arrives the time of local terminal, and the test packet that carries in the test response message arrives the temporal information of Correspondent Node and the temporal information that Correspondent Node sends the test response message.
8. device according to claim 6 is characterized in that, the transmission delay computing unit comprises:
Attribute is subelement relatively: is used for comparison local terminal system time attribute and whether is better than Correspondent Node system time attribute, if, local terminal is made as main end, Correspondent Node is made as from end; If not, local terminal is made as from end, Correspondent Node is made as main end;
Receive subelement from the end test packet: be used to receive the test packet that main end sends, the record test packet arrives the temporal information that the main end that carries sends test packet from the time of end and test packet;
Send subelement from end test response message: be used for to the main transmitting time that sends the test response message and write down the test response message of holding;
Reply message from end and receive subelement: be used to receive the main answer message of holding the test response message that sends, write down the temporal information that the test response message that carries in the described answer message arrives main end.
9. according to claim 7 or 8 described devices, it is characterized in that the transmission delay computing unit also comprises:
Test packet transmission delay computation subunit: deduct the test packet transmitting time time of advent with test packet and obtain the test packet transmission delay;
Test response message transmissions time-delay computation subunit: deduct test response message transmitting time the time of advent with the test response message and obtain the test response message transmissions and delay time;
Link transmission time-delay computation subunit: add the time-delay of test response message transmissions with the test packet transmission delay, remove 2 again, obtain the link transmission time-delay.
10. device according to claim 6 is characterized in that this device also comprises:
Whether detecting unit: it is normal to detect this end system, if this end system normally carries out next step delay test, otherwise report and alarm.
11. the system that the optical fiber asymmetry is measured is characterized in that, comprising: simplex optical module, measurement module and computing module, wherein,
Simplex optical module: be used for also receiving from the message of receiving a link and a link to receiving link and sending out link transmission message;
Measurement module: be used to generate the message that simplex optical module sends, handle from the message of receiving a link and a link, and the transmitting-receiving time of record test packet and test response message;
Computing module: be used for sending out the transmission delay of link and receipts link, and then calculate the asymmetry value of receiving-transmitting chain according to the transmitting-receiving Time Calculation of test packet and test response message.
12. system according to claim 11 is characterized in that, described measurement module comprises:
Clock submodule: be used to produce system clock;
Message generates submodule: be used to generate the message that simplex optical module sends;
Message processing sub: be used to handle message from receiving a link and a link;
The timing submodule: be used to utilize the system clock of clock submodule generation, record generates submodule and the test packet of message processing sub and the transmitting-receiving time of test response message from message.
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