CN108668182A - A kind of optical transmission system synchronous detecting method - Google Patents
A kind of optical transmission system synchronous detecting method Download PDFInfo
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- CN108668182A CN108668182A CN201710188616.XA CN201710188616A CN108668182A CN 108668182 A CN108668182 A CN 108668182A CN 201710188616 A CN201710188616 A CN 201710188616A CN 108668182 A CN108668182 A CN 108668182A
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- network element
- clock
- optical transmission
- transmission system
- synchronous
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0793—Network aspects, e.g. central monitoring of transmission parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
This application discloses a kind of optical transmission system synchronous detecting method, the problems such as solving strange land synchronous reference reference measured error and limited test condition.Include the following steps：Start clock test instrument and export clock signal, is input to the outer synchronous input interface of local network element；The local network element is set, makes its outer synchronous synchronized equipment timing generator output interface output of input interface signal, is used as line clock, is transmitted to circuit network element；Each described circuit network element is set, makes the synchronized equipment timing generator output interface output of its line signal input interface signal, is used as line clock, is transmitted to local network element or next circuit network element；The local network element is set, so that its line signal input interface signal is exported through outer synchronism output interface, as measured signal, accesses the clock test instrument.The application also proposes corresponding test system.The limitation that the present invention improves system testing accuracy, breaks away from test source and test reference point.
Description
Technical field
This application involves field of communication technology more particularly to a kind of synchronous detecting methods of optical transmission system.
Background technology
Synchronous net contacts closely as important support network and transmission network, and traditional SDH/MSTP Optical Transmission Network OTNs are operated in
TDM modes need highly reliable and high performance clock sync signal could stable operation.Although OTN/PTN technologies and tradition
SDH/MSTP is different to synchronous requirement, but as important bearer network, needs to synchronize signal with other bearer networks
On the other hand docking needs the time link tissue for synchronous net to provide support, also faces carrying frequency and time synchronizing signal
The problem of.
SDH/MSTP, PTN, OTN optical transmission system Frequency Synchronization now net test, to performance verification, engineering opening, safeguard
To important role, however now net test method deposits drawback both ways at present：On the one hand, since source and egress are different
Computer room, needs to draw and connects different synchronous reference sources, can inevitably introduce measurement error to a certain extent；On the other hand,
Test source and test reference are limited to the physical location of computer room, for the atomic clock mode of transport of test, optical transmission device
Synchronizing signal draws narrow bars part etc., and now net test can only choose specific website and be tested, and can not often cover optical transmission system
Representative synchronization link.
Invention content
A kind of optical transmission system synchronous detecting method of the application proposition and system solve strange land synchronous reference reference measurement and miss
The problems such as difference and limited test condition.
The embodiment of the present application provides a kind of optical transmission system synchronous detecting method, and the optical transmission system includes a local
Network element and at least one circuit network element, the local network element and circuit network element all include line signal input interface, outer synchronous defeated
Incoming interface, outer synchronism output interface, Synchronous Equipment Timing Generator output interface, include the following steps：
Start clock test instrument and export clock signal, is input to the outer synchronous input interface of the local network element；
The local network element is set, keeps its synchronized equipment timing generator output interface of outer synchronous input interface signal defeated
Go out, is used as line clock, is transmitted to circuit network element；
Each described circuit network element is set, keeps its synchronized equipment timing generator of line signal input interface signal defeated
Outgoing interface exports, and is used as line clock, is transmitted to local network element or next circuit network element；
The local network element is set, so that its line signal input interface signal is exported through outer synchronism output interface, as quilt
Signal is surveyed, the clock test instrument is accessed.
In the optical transmission system synchronous detecting method, the optical transmission system is SDH/MSTP, PTN or OTN system.
Preferably, the clock signal is 2Mbps or 2MHz.
Preferably, in the optical transmission system synchronous detecting method, any one node in the optical transmission system is selected
As local network element；At least one node of other in the optical transmission system is selected to be used as circuit network element；It is described local network element and
It is sequentially connected by transmission channel between the circuit network element and realizes loopback.
The embodiment of the present application also provides a kind of optical transmission system synchronous test system, and the optical transmission system includes a sheet
Ground network element and at least one circuit network element, the local network element and circuit network element all include line signal input interface, outer synchronous
Input interface, outer synchronism output interface, Synchronous Equipment Timing Generator output interface, the test system include clock test instrument
Table：The clock test instrument exports 2Mbps or 2MHz clock signals, and the outer synchronous input for being input to the local network element connects
Mouthful；
The outer synchronous synchronized equipment timing generator output interface output of input interface signal of the local network element, is used as
Line clock is transmitted to circuit network element；
The synchronized equipment timing generator output interface output of line signal input interface signal of the circuit network element, is used
Make line clock, is transmitted to local network element or next circuit network element；
The line signal input interface signal of the local network element is exported through outer synchronism output interface, as measured signal,
Access the clock test instrument.
In the optical transmission system synchronous test system, the optical transmission system is SDH/MSTP, PTN or OTN system.
Preferably, the clock signal is 2Mbps or 2MHz.
Preferably, in the optical transmission system synchronous test system, the local network element is to appoint in the optical transmission system
One node of meaning；The circuit network element is to include other at least one nodes in the optical transmission system；It is described local network element and
It is sequentially connected by transmission channel between the circuit network element and realizes loopback.
Above-mentioned at least one technical solution that the embodiment of the present application uses can reach following advantageous effect：In conclusion
The present invention is directed in SDH/MSTP, PTN, OTN optical transmission system to be synchronized based on the net method of synchronization and be proposed under signal transmission
On the one hand novel synchronous loop testing method, technical solution of the present invention solve the measurement error that remote-site testing reference tape comes and ask
Topic, improves system testing accuracy；On the other hand the limitation for having broken away from test source and test reference point, can be according to reality
It needs any node in optical transmission system to be tested, reduces testing cost, reduce O＆M risk.
Description of the drawings
Attached drawing described herein is used for providing further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please do not constitute the improper restriction to the application for explaining the application.In the accompanying drawings：
Fig. 1 is optical transmission device Frequency Synchronization time clock feature model；
Fig. 2 is that optical transmission system shows net synchronous routine test method schematic diagram；
Fig. 3 is optical transmission system synchronous test system structure chart of the present invention；
Fig. 4 is optical transmission system synchronous detecting method flow chart of the present invention.
Specific implementation mode
To keep the purpose, technical scheme and advantage of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, shall fall in the protection scope of this application.
The technology of the present invention key point is on optical transmission device to orient export function T4=T1/ by clock selector
TE/TN realizes that clock loopback measures.The technology is suitable for OTN/POTN, PTN or SDH/MSTP equipment under ring-network topology environment.
The present invention carries out local loopback test, a side by the orientation export function of optical transmission device clock to synchronizing signal
Face eliminates the measurement error of the not homologous introducing of strange land clock reference, has on the other hand broken away from test site deployment clock reference ring
The limited bottleneck in border, synchronizes signal for optical transmission system and now nets to test and provide flexible solution.
The application uses following abbreviation：LPR --- local primary reference；OTN --- optical transport network；POTN——
Grouping transmission optical-fiber network；PTN --- Packet Transport Network；PRC --- primary reference clock；SDH --- synchronous digital system；
MSTP --- multi-service transport platform；NE --- network element.
Below in conjunction with attached drawing, the technical solution that each embodiment of the application provides is described in detail.
Fig. 1 is optical transmission device Frequency Synchronization time clock feature model.Existing optical transmission device clock models, wherein TN/
TE/T1 is respectively OTUk/ synchronous ethernets/STM-N input interfaces, and T2 is tributary signal input interface, and T3 is outer synchronous input
Interface, SETG are Synchronous Equipment Timing Generator, and T4 is outer synchronism output interface, and T0 is internal timing interface.OTN/POTN is set
It is standby to support TN/TE/T1/T2/T3 input clock interfaces；PTN device supports TE/T1/T2/T3 input clock interfaces；SDH/MSTP
Equipment supports T1/T2/T3 input clock interfaces.
Fig. 2 is that optical transmission system shows net synchronous routine test method schematic diagram.As used net in conventional optical transmission system
When the method for synchronization synchronizes signal(l)ing test, source and egress are strange land node.It has been usually deployed and has been traced to the source to defending in source
2M frequency signals, are input to the Wireless Clock Interface Unit of optical transmission device, are connect by clock by the clock synchronization device (PRC or LPR) of star
Oralia is sent synchronizing signal to system clock module by backboard or jumper, after multistation is handled point by point, in egress
2M synchronism detection signals are exported on Wireless Clock Interface Unit, have been traced to the source in access station same to progress in the synchronism detection instrument of cesium-beam atomic clock
Pacing tries.
It is as follows that existing measuring technology deposits drawback both ways：
On the one hand, strange land benchmark is not homologous, introduces measurement error, can not correct.Although the synchronous base and egress of source
Test benchmark should all reach China level-one reference clock 3E-12 frequency accuracy it is horizontal, but due to the synchronous base of source
It is in remote room with the test benchmark of egress, since satellite receives star number amount, receipts championship is set, satellite receiver process performance, instrument
The measurement error that the non-ideal factors such as scaling down processing, phaselocked loop processing are brought inside table is difficult to avoid that, the fractional error without
Method is modified and is compensated by model, therefore influences whether the measuring accuracy of synchronization system test.
On the other hand, test environment, test station limited resource are more, influence the choosing of test addressing and representative synchronization link
It takes.Frequency Synchronization is tested, otherwise egress computer room needs to dispose PRC or LPR level-one reference clock equipment offer test reference,
Frequency Synchronization system testing could be carried out after needing additional cesium-beam atomic clock output reference signal.Therefore the test method pair
Computer room field condition is more demanding, and particularly with synchronization link to be tested is typically needed, there are the objective problems of addressing difficulty.
Fig. 3 is optical transmission system synchronous test system structure chart of the present invention.The optical transmission system is SDH/MSTP, PTN
Or OTN system.The embodiment of the present application provides a kind of optical transmission system synchronous test system, and the optical transmission system includes a sheet
Ground network element NE1 and at least one circuit network element NE2~NEn, the local network element and circuit network element all include that line signal inputs
Interface TN/TE/T1, outer synchronous input interface T3, outer synchronism output interface T4, Synchronous Equipment Timing Generator output interface T0,
The test system includes clock test instrument；The clock test instrument exports 2Mbps or 2MHz clock signals, is input to institute
State the outer synchronous input interface of local network element；The outer synchronous synchronized equipment timing of input interface signal of the local network element occurs
Device output interface exports, and is used as line clock, is transmitted to circuit network element；The line signal input interface signal of the circuit network element
Synchronized equipment timing generator output interface output, is used as line clock, is transmitted to local network element or next circuit network element；
The line signal input interface signal of the local network element is exported through outer synchronism output interface, as measured signal, described in access
Clock test instrument.
Preferably, in the optical transmission system synchronous test system, the local network element is to appoint in the optical transmission system
One node of meaning；The circuit network element includes other at least one nodes in the optical transmission system；The local network element and institute
It states and is sequentially connected by transmission channel between circuit network element and realizes loopback.
For example, in Fig. 1 1. clock signal is injected：Clock test instrument passes through 2Mbps or the side 2MHz as Frequency Synchronization source
Clock signal is injected into local network element NE1 by formula, after the clock selector unit setting T0=T3 of NE1, outlet line clock
Signal is to NE2；
2. clock signal transmits：The clock selector of NE2~NEn network elements is configured to T0=T1/TE/TN, i.e., from circuit into
Row clock extracts, and after sealing in local system clock, clock signal is transmitted to next network element by circuit；
3. clock signal, which is drawn, to be connect：The line clock of NEn is recycled to local network element NE1, is matched in clock selector
After setting T4=T1/TE/TN, it will be tested in the external clock output signal access instrument of NE1.
Fig. 4 is optical transmission system synchronous detecting method flow chart of the present invention.In the optical transmission system synchronous detecting method,
The optical transmission system is SDH/MSTP, PTN or OTN system.The optical transmission system is comprising a local network element NE1 and at least
One circuit network element NE2~NEn, the local network element and circuit network element all include line signal input interface TN/TE/T1, outer
Synchronous input interface T3, outer synchronism output interface T4, Synchronous Equipment Timing Generator output interface T0, the embodiment of the present application provide
A kind of optical transmission system synchronous detecting method, include the following steps：
Step 11 starts clock test instrument output 2Mbps or 2MHz clock signals, is input to the outer of the local network element
Synchronous input interface；
For example, starting clock test instrument, after confirming that output 2Mbps or 2MHz clock signals are normal, it is injected into this
Ground network element NE1；
Step 12, the setting local network element, keep its synchronized equipment timing generator of outer synchronous input interface signal defeated
Outgoing interface exports, and is used as line clock, is transmitted to circuit network element；
For example, configuring T0=T3 on the clock selector of local network element NE1, circuit network element NE2 is given in output；
Each described circuit network element is arranged in step 13, makes the synchronized equipment timing of its line signal input interface signal
Generator output interface exports, and is used as line clock, is transmitted to local network element or next circuit network element；
For example, T0=T1/TE/TN is configured on the clock selector of line network member NE2, and after circuit extracts clock, string
Enter system clock and is exported again with line clock；
If there is multiple circuit network elements, such as NE3~NEn, configured respectively according to step 13；
Step 14, the setting local network element, make its line signal input interface signal be exported through outer synchronism output interface,
As measured signal, the clock test instrument is accessed.
For example, after configuring T4=T1/TE/TN in local network element NE1 clock selectors, by its outer synchronism output interface T4
It is tested in signal access instrument.
Preferably, in the optical transmission system synchronous detecting method, any one node in the optical transmission system is selected
As local network element；At least one node of other in the optical transmission system is selected to be used as circuit network element；It is described local network element and
It is sequentially connected by transmission channel between the circuit network element and realizes loopback.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
Including so that process, method, commodity or equipment including a series of elements include not only those elements, but also wrap
Include other elements that are not explicitly listed, or further include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that wanted including described
There is also other identical elements in the process of element, method, commodity or equipment.
Above is only an example of the present application, it is not intended to limit this application.For those skilled in the art
For, the application can have various modifications and variations.It is all within spirit herein and principle made by any modification, equivalent
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (8)
1. a kind of optical transmission system synchronous detecting method, the optical transmission system includes a local network element and at least one circuit
Network element, the local network element all connect comprising line signal input interface, outer synchronous input interface, outer synchronism output with circuit network element
Mouth, Synchronous Equipment Timing Generator output interface, which is characterized in that include the following steps：
Start clock test instrument and export clock signal, is input to the outer synchronous input interface of the local network element；
The local network element is set, its outer synchronous synchronized equipment timing generator output interface output of input interface signal is made,
As line clock, it is transmitted to circuit network element；
Each described circuit network element is set, the synchronized equipment timing generator output of its line signal input interface signal is made to connect
Mouth output, is used as line clock, is transmitted to local network element or next circuit network element；
The local network element is set, so that its line signal input interface signal is exported through outer synchronism output interface, as tested letter
Number, access the clock test instrument.
2. optical transmission system synchronous detecting method as described in claim 1, which is characterized in that
The optical transmission system is SDH/MSTP, PTN or OTN system.
3. optical transmission system synchronous detecting method as described in claim 1, which is characterized in that
Any one node in the optical transmission system is selected to be used as local network element；
At least one node of other in the optical transmission system is selected to be used as circuit network element；
It is sequentially connected by transmission channel between the local network element and the circuit network element and realizes loopback.
4. the optical transmission system synchronous detecting method as described in claims 1 to 3 any one, which is characterized in that
The clock signal is 2Mbps or 2MHz.
5. a kind of optical transmission system synchronous test system, the optical transmission system includes a local network element and at least one circuit
Network element, the local network element all connect comprising line signal input interface, outer synchronous input interface, outer synchronism output with circuit network element
Mouth, Synchronous Equipment Timing Generator output interface, which is characterized in that
The test system includes clock test instrument；
The clock test instrument exports 2Mbps or 2MHz clock signals, and the outer synchronous input for being input to the local network element connects
Mouthful；
The outer synchronous synchronized equipment timing generator output interface output of input interface signal of the local network element, is used as circuit
Clock is transmitted to circuit network element；
The synchronized equipment timing generator output interface output of line signal input interface signal of the circuit network element, is used as line
Road clock is transmitted to local network element or next circuit network element；
The line signal input interface signal of the local network element is exported through outer synchronism output interface, as measured signal, access
The clock test instrument.
6. optical transmission system synchronous test system as claimed in claim 5, which is characterized in that
The optical transmission system is SDH/MSTP, PTN or OTN system.
7. optical transmission system synchronous test system as claimed in claim 5, which is characterized in that
The local network element is any one node in the optical transmission system；
The circuit network element is to include other at least one nodes in the optical transmission system；
It is sequentially connected by transmission channel between the local network element and the circuit network element and realizes loopback.
8. the optical transmission system synchronous test system as described in claim 5~7 any one, which is characterized in that
The clock signal is 2Mbps or 2MHz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710188616.XA CN108668182B (en) | 2017-03-27 | 2017-03-27 | Synchronous testing method for optical transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710188616.XA CN108668182B (en) | 2017-03-27 | 2017-03-27 | Synchronous testing method for optical transmission system |
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| CN108668182A true CN108668182A (en) | 2018-10-16 |
| CN108668182B CN108668182B (en) | 2020-09-08 |
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| CN101286835A (en) * | 2007-04-11 | 2008-10-15 | 华为技术有限公司 | Clock tracing method, device and network element device |
| CN101431444A (en) * | 2007-11-07 | 2009-05-13 | 中兴通讯股份有限公司 | Test method for transmission equipment clock synchronous information switching time delay |
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Effective date of registration: 20211227 Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF INFORMATION AND COMMUNICATIONS Address before: 100191 No. 52 Garden North Road, Beijing, Haidian District Patentee before: CHINA ACADEME OF TELECOMMUNICATION RESEARCH OF MIIT |