CN107070576A - A kind of system and method that 1588 time synchronizeds are realized in OTN equipment rooms - Google Patents
A kind of system and method that 1588 time synchronizeds are realized in OTN equipment rooms Download PDFInfo
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- CN107070576A CN107070576A CN201710154138.0A CN201710154138A CN107070576A CN 107070576 A CN107070576 A CN 107070576A CN 201710154138 A CN201710154138 A CN 201710154138A CN 107070576 A CN107070576 A CN 107070576A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0647—Synchronisation among TDM nodes
- H04J3/065—Synchronisation among TDM nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
Abstract
The present invention relates to network communication field, disclose a kind of system for realizing 1588 time synchronizeds in OTN equipment rooms, including transmitting terminal and receiving terminal, transmitting terminal includes connected time message transmission and beats time stamp device and OTN expense frame framing devices, receiving terminal includes the OTN expense frame solution frame devices being connected and time message receives and beats time stamp device, wherein, the OTN expense frame solution frame devices that the OTN expenses frame framing device of transmitting terminal in transmitting terminal and receiving terminal, and an OTN equipment is equipped with two OTN equipment with receiving terminal in another OTN equipment are connected.The invention also discloses a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms.The present invention can make the interaction of two OTN equipment rooms progress time synchronized message.
Description
Technical field
The present invention relates to network communication field, and in particular to a kind of system for realizing 1588 time synchronizeds in OTN equipment rooms
With a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms.
Background technology
Time synchronized function is time calibration approach important between transmission equipment and transmission equipment, particularly with it is real-time
In the property degree of correlation very high business or transmission equipment, time synchronized function more seems important.1588 time synchronized function energy
The time synchronizing method of the time synchronized of nanosecond dimension accuracy, far superior to other manner is enough reached, thus by most of transmission
Equipment is used.1588 time synchronizeds, full name IEEE1588 time synchronizeds are a kind of for network measure and the essence of control system
Close clock synchronization protocol.
According to the regulation of IEEE1588V2 agreements, the main carriers of time synchronized message (or PTP messages) are Ethernet
Message.In different types of transmission equipment, the transmission path of time message is also different, such as in PTN (Packet
Transport Network, Packet Transport Network) in equipment, the transmission path of time message and the transmission path phase of service message
Together, i.e., mixed biography is carried out on Ethernet path, but is set for OTN (Optical Transport Network, optical transfer network)
Standby, ITU-T tissues have issued newest G.709 standard, for realizing the time synchronized in OTN equipment, thus each factory at present
Business is that the realization of 1588 time synchronized functions is carried out according to oneself OTN equipment feature, but between two PTN devices, mesh
Before also lack a kind of preferable time synchronized message interaction mode and be used to realize 1588 time synchronized functions of two OTN equipment rooms.
The content of the invention
For defect present in prior art, 1588 are realized in OTN equipment rooms it is an object of the invention to provide one kind
The system of time synchronized and a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms, make two OTN equipment rooms carry out the time same
Walk the interaction of message.
To achieve the above objectives, the present invention is adopted the technical scheme that, including：
Transmitting terminal, it includes connected time message transmission and beats time stamp device and OTN expense frame framing devices, the time
Message, which is sent, plays the replacement that time stamp device is used to carry out time message time stamp and amendment domain, and by the time message after replacement
Send to OTN expenses frame framing device progress GFP-F and encode to form OTN expenses frame data stream and send；
Receiving terminal, it includes the OTN expense frame solution frame devices being connected and time message receives and beats time stamp device, the OTN
Expense frame solution frame device is used to receive OTN expense frame data streams, and obtains time message to the decoding of OTN expenses frame data stream, so
Time message is sent to the time message afterwards to receive and plays the replacement that time stamp device carries out time stamp and amendment domain；
Wherein, the OTN expense frame groups of transmitting terminal in transmitting terminal and receiving terminal, and an OTN equipment are equipped with two OTN equipment
Frame device is connected with the OTN expense frame solution frame devices of receiving terminal in another OTN equipment.
On the basis of above-mentioned technical proposal, the two ends difference Connection Time message data frame input bus of the transmitting terminal
With OTN expense frame output bus, the two ends of the receiving terminal connect OTN expense frame input bus and time message data frame respectively
The OTN expenses of the OTN expense frame output bus of transmitting terminal and receiving terminal in another OTN equipment in output bus, and an OTN equipment
Frame input bus is connected.
The invention also discloses a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms, including：
S1：In an OTN equipment, the time stamp field for the time message that time message data frame input bus is inputted is replaced
For equipment current time value, and by the amendment domain field of time message replace with equipment current time value with it is existing in time message
Difference between time stamp, the equipment current time value is the current time value that time message is presently in OTN equipment；
S2：Time message after replacement is handled is filled in the OTN expense frames MFAS of sending direction, to OTN expense frames
MFAS carries out GFP-F codings, forms OTN expenses frame data stream and sends to another OTN equipment；
S3：Another OTN equipment receives OTN expense frame data streams, and OTN expenses frame data stream progress decoding process is obtained
Time message and the OTN expense frames MFAS for receiving direction；
S4：The time stamp field of time message is replaced with into equipment current time value, and by the amendment domain field of time message
The difference between existing time stamp in equipment current time value and time message is replaced with, time stamp field and amendment then will be substituted for
The time message of domain field is exported through time message data frame output bus.
On the basis of above-mentioned technical proposal, S1 is specially：
S101：Receive the OTN expense frames MFAS of time message and the sending direction in OTN expense frame interfaces；
S102：Find out the time stamp in time message and amendment domain position；
S103：Time stamp field in time message is replaced with into equipment current time value, and domain word will be corrected in time message
Section replaces with the difference between existing time stamp in equipment current time value and time message.
On the basis of above-mentioned technical proposal, S2 is specially：
S201：Increase frame header fields before the OTN expense frames MFAS of sending direction, time message is filled in transmission
In the OTN expense frames MFAS in direction follow-up field；
S202：The crc field of 4 bytes is added after the time message on OTN expense frames MFAS, OTN is formed and opens
Frame data stream is sold, the verification scope of the crc field is all bytes of time message；
S203：Scrambler processing is carried out to OTN expenses frame data stream.
On the basis of above-mentioned technical proposal, in the OTN expenses frame data stream write-in circuit OTN traffic frames, Ran Houcong
One OTN equipment is transmitted to another OTN equipment.
On the basis of above-mentioned technical proposal, S3 is specially：
S301：OTN expense frame data streams are decoded and decoding process, time message is obtained and receives the OTN in direction
Expense frame MFAS；
S302：Time message is verified, judges whether time message is filled in the OTN expense frames of sending direction before
Time message in MFAS, if so, then retaining, if it is not, then abandoning.
On the basis of above-mentioned technical proposal, the OTN expenses frame data stream is carried out after GFP framing processing, then is solved
Code and decoding process.
On the basis of above-mentioned technical proposal, S4 is specially：
S401：Find out the time stamp in time message and amendment domain position；
S402：Time stamp field in time message is replaced with into equipment current time value, and domain word will be corrected in time message
Section replaces with the difference between existing time stamp in equipment current time value and time message, then will substituted for time stamp field and repair
The time message of positive domain field is exported through time message data frame output bus.
Compared with prior art, a kind of advantage for the system that 1588 time synchronizeds are realized in OTN equipment rooms of the present invention is：
Transmitting terminal and receiving terminal are equipped with two OTN equipment, by the OTN expense frame framing devices in transmitting terminal, time message is entered
Row GFP-F coding encapsulation, so that time message is transmitted in two OTN equipment rooms, the interaction of deadline message, so that
Realize 1588 time synchronizeds of OTN equipment rooms.
A kind of advantage for the method that 1588 time synchronizeds are realized in OTN equipment rooms of the present invention is：By to time message
The replacement of time stamp and amendment domain numerical value is carried out, time calibration is carried out, then time message is filled in the OTN expenses of sending direction
In frame MFAS, GFP-F codings are carried out, so that ethernet frame is placed on into one for non-Ethernet transmission auxiliary lattice in the form of load
Inside formula, in order to be transmitted in two OTN equipment, so that the time message in an OTN equipment reaches another OTN equipment
In, the interaction of time message is carried out, is then again carried out to time message time calibration, so as to complete the 1588 of two OTN equipment
Time synchronized.
Brief description of the drawings
Fig. 1 is a kind of structural representation for the system that 1588 time synchronizeds are realized in OTN equipment rooms of the present invention；
Fig. 2 is a kind of flow chart for the method that 1588 time synchronizeds are realized in OTN equipment rooms of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Shown in Figure 1, the present invention provides a kind of system for realizing 1588 time synchronizeds in OTN equipment rooms, for two
OTN equipment rooms realize 1588 time synchronizeds, including：Transmitting terminal and receiving terminal are equipped with two OTN equipment, transmitting terminal includes being connected
Time message send and beat time stamp device and OTN expense frame framing devices, time message, which is sent, beats time stamp device for the time
Message carries out time stamp and corrects the replacement in domain, and the time message after replacement is sent to the OTN expenses frame framing device
GFP-F is carried out to encode to form OTN expenses frame data stream and send, i.e., be placed on by ethernet frame in the form of load a confession it is non-with
Too inside net transmission subformat, in order to be transmitted in two OTN equipment, receiving terminal includes connected OTN expense frame solution frames
Device and time message, which are received, beats time stamp device, and OTN expense frame solution frames device is used to receive OTN expense frame data streams, and to OTN
The decoding of expense frame data stream obtains time message, then sends to the time message to receive by time message and beats time stamp device and enter
Row time stamp and the replacement for correcting domain, and in an OTN equipment in the OTN expenses frame framing device of transmitting terminal and another OTN equipment
The OTN expense frame solution frames device of receiving terminal is connected.
The two ends difference Connection Time message data frame input bus and OTN expense frame output bus of transmitting terminal, receiving terminal
Two ends connect transmitting terminal in OTN expense frame input bus and time message data frame output bus, and an OTN equipment respectively
OTN expense frame output bus is connected with the OTN expense frame input bus of receiving terminal in another OTN equipment, i.e., time message is sent
Time stamp device Connection Time message data frame input bus is beaten, time message data frame input bus is used to send to time message
Beat input time message in time stamp device, OTN expense frame framings device connection OTN expense frame output bus, OTN expense frame solution frames
Device connects OTN expense frame input bus, and time message receives and beats time stamp device Connection Time message data frame output bus, when
Between message data frame output bus be used for will carry out time stamp and amendment domain replace time message output.
Shown in Figure 2, the present invention is also provided a kind of realizes 1588 time synchronizeds based on said system in OTN equipment rooms
Method, including：
S1：In an OTN equipment, the time stamp field of time message is replaced with into equipment current time value, and will report the time
The amendment domain field of text replaces with the difference between existing time stamp in equipment current time value and time message, and the step is in the time
Message is sent to beat in time stamp device and completed, and time message is sent by time message data frame input bus input time message and beaten
In time stamp device.Equipment current time value is the current time value that time message is presently in OTN equipment.Specifically：
S101：Receive the OTN expense frame MFAS (Multi- of time message and the sending direction in OTN expense frame interfaces
Frame Alignment Signal, multiframe alignment byte), the OTN expense frame MFAS of sending direction are sent out by OTN expenses frame interface
Deliver to time message transmission and beat time stamp device；
S102：Find out the time stamp in time message and amendment domain position；
S103：The time stamp field of time message is replaced with into equipment current time value, and by the amendment domain word of time message
Section replaces with the difference between existing time stamp in equipment current time value and time message.
S2：Time message after above-mentioned replacement is handled is filled in the OTN expense frames MFAS of sending direction, and OTN is opened
Sell frame MFAS and carry out GFP-F codings, form OTN expenses frame data stream and simultaneously send to another OTN equipment, i.e., by ethernet frame to carry
The form of lotus is placed on one and transmitted for non-Ethernet inside subformat, and in order to be transmitted in two OTN equipment, GFP is one
Kind is common to supply non-Ethernet to transmit the frame tunneling inside subformat ethernet frame to be placed on one in the form of load,
GFP-F is the frame mapped mode in the both of which that the frame tunneling is used for different business data.The step is in OTN
Complete, specifically include in expense frame framing device：
S201：Increase frame header fields before the OTN expense frames MFAS of sending direction, time message is filled in transmission
In the OTN expense frames MFAS in direction follow-up field；
S202：The crc field of 4 bytes is added after the time message on OTN expense frames MFAS, OTN is formed and opens
Frame data stream is sold, crc field is school searching section, and the verification scope of crc field is all bytes of time message；
S203：Scrambler processing is carried out to OTN expenses frame data stream, it is to avoid other effect of signals OTN expense frame data streams, so
OTN expenses frame data stream is write in circuit OTN traffic frames afterwards, the OTN expense frame data then write in circuit OTN traffic frames
Stream is transmitted to another OTN equipment from an OTN equipment, specifically, the OTN expenses frame data circulation in write-in circuit OTN traffic frames
OTN expense frame output bus and OTN expense frame input bus are crossed, is transmitted from an OTN equipment into another OTN equipment.
S3：Another OTN equipment receives OTN expense frame data streams, and OTN expenses frame data stream progress decoding process is obtained
Time message and the OTN expense frames MFAS for receiving direction；The step is completed in OTN expense frame solution frame devices, is specifically included：
S301：OTN expense frame data streams are decoded and decoding process, time message is obtained and receives the OTN in direction
Expense frame MFAS；
S302：Time message is verified, judges whether time message is filled in the OTN expense frames of sending direction before
Time message in MFAS, if so, then retaining, if it is not, then abandoning.
S4：The time stamp field of time message is replaced with into equipment current time value, and by the amendment domain field of time message
The difference between existing time stamp in equipment current time value and time message is replaced with, time stamp field and amendment then will be substituted for
The time message of domain field is exported through time message data frame output bus.The step is received in time message and beaten in time stamp device
Complete, specifically include：
S401：Find out the time stamp in time message and amendment domain position；
S402：The time stamp field of time message is replaced with into equipment current time value, and by the amendment domain word of time message
Section replaces with the difference between existing time stamp in equipment current time value and time message, then will substituted for time stamp field and repair
The time message of positive domain field is exported through time message data frame output bus, that is, is exported to receiving OTN expense frame data streams
OTN equipment, so as to complete the time synchronized of two OTN equipment rooms.
The method for realizing 1588 time synchronizeds in OTN equipment rooms of the present invention, by carrying out time stamp to time message and repairing
The replacement of positive domain numerical value, carries out time calibration, then time message is filled in the OTN expense frames MFAS of sending direction, entered
Row GFP-F is encoded, so that ethernet frame is transmitted inside subformat with being placed on one in the form of load for non-Ethernet, so as to
It is transmitted in two OTN equipment, so that the time message in an OTN equipment is reached in another OTN equipment, carries out time report
The interaction of text, then carries out time calibration, so as to complete 1588 time synchronizeds of two OTN equipment to time message again.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (9)
1. a kind of system for realizing 1588 time synchronizeds in OTN equipment rooms, for realizing that 1588 times are same in two OTN equipment rooms
Step, it is characterised in that including：
Transmitting terminal, it includes connected time message transmission and beats time stamp device and OTN expense frame framing devices, the time message
Send and play the replacement that time stamp device is used to carry out time message time stamp and amendment domain, and the time message after replacement is sent
GFP-F is carried out to the OTN expenses frame framing device to encode to form OTN expenses frame data stream and send；
Receiving terminal, it includes the OTN expense frame solution frame devices being connected and time message receives and beats time stamp device, the OTN expenses
Frame solution frame device is used to receive OTN expense frame data streams, and obtains time message to the decoding of OTN expenses frame data stream, then will
Time message, which sends to the time message to receive, plays the replacement that time stamp device carries out time stamp and amendment domain；
Wherein, the OTN expense frames framing dress of transmitting terminal in transmitting terminal and receiving terminal, and an OTN equipment is equipped with two OTN equipment
Put and be connected with the OTN expense frame solution frame devices of receiving terminal in another OTN equipment.
2. a kind of system for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 1, it is characterised in that：It is described
The two ends difference Connection Time message data frame input bus and OTN expense frame output bus of transmitting terminal, the two of the receiving terminal
End connects the OTN of transmitting terminal in OTN expense frame input bus and time message data frame output bus, and an OTN equipment respectively
Expense frame output bus is connected with the OTN expense frame input bus of receiving terminal in another OTN equipment.
3. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms based on any one of claim 1 or 2 system,
It is characterised in that it includes：
S1：In an OTN equipment, the time stamp field for the time message that time message data frame input bus is inputted, which is replaced with, to be set
Standby current time value, and the amendment domain field of time message is replaced with into equipment current time value and existing time stamp in time message
Between difference, the equipment current time value is that time message is presently in the current time value of OTN equipment；
S2：Time message after replacement is handled is filled in the OTN expense frames MFAS of sending direction, to OTN expense frames MFAS
GFP-F codings are carried out, OTN expenses frame data stream is formed and sends to another OTN equipment；
S3：Another OTN equipment receives OTN expense frame data streams, and obtains the time to OTN expenses frame data stream progress decoding process
Message and the OTN expense frames MFAS for receiving direction；
S4：The time stamp field of time message is replaced with into equipment current time value, and the amendment domain field of time message is replaced
For the difference between existing time stamp in equipment current time value and time message, time stamp field and amendment domain word then will be substituted for
The time message of section is exported through time message data frame output bus.
4. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 3, it is characterised in that S1 has
Body is：
S101：Receive the OTN expense frames MFAS of time message and the sending direction in OTN expense frame interfaces；
S102：Find out the time stamp in time message and amendment domain position；
S103：Time stamp field in time message is replaced with into equipment current time value, and replaced domain field is corrected in time message
It is changed to the difference between existing time stamp in equipment current time value and time message.
5. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 4, it is characterised in that S2 has
Body is：
S201：Increase frame header fields before the OTN expense frames MFAS of sending direction, time message is filled in sending direction
OTN expense frames MFAS follow-up field in；
S202：The crc field of 4 bytes is added after the time message on OTN expense frames MFAS, OTN expense frames are formed
Data flow, the verification scope of the crc field is all bytes of time message；
S203：Scrambler processing is carried out to OTN expenses frame data stream.
6. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 5, it is characterised in that：It is described
In OTN expenses frame data stream write-in circuit OTN traffic frames, then transmitted from an OTN equipment to another OTN equipment.
7. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 5, it is characterised in that S3 has
Body is：
S301：OTN expense frame data streams are decoded and decoding process, time message is obtained and receives the OTN expenses in direction
Frame MFAS；
S302：Time message is verified, judges whether time message is filled in the OTN expense frames MFAS of sending direction before
In time message, if so, then retaining, if it is not, then abandoning.
8. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 7, it is characterised in that：It is described
OTN expenses frame data stream is carried out after GFP framing processing, then is decoded and decoding process.
9. a kind of method for realizing 1588 time synchronizeds in OTN equipment rooms as claimed in claim 8, it is characterised in that S4 has
Body is：
S401：Find out the time stamp in time message and amendment domain position；
S402：Time stamp field in time message is replaced with into equipment current time value, and replaced domain field is corrected in time message
The difference between existing time stamp in equipment current time value and time message is changed to, time stamp field and amendment domain then will be substituted for
The time message of field is exported through time message data frame output bus.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710154138.0A CN107070576B (en) | 2017-03-15 | 2017-03-15 | A kind of system and method for realizing 1588 time synchronizations in OTN equipment room |
| PCT/CN2017/109845 WO2018166223A1 (en) | 2017-03-15 | 2017-11-08 | System and method for realizing 1588 time synchronization between otn devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710154138.0A CN107070576B (en) | 2017-03-15 | 2017-03-15 | A kind of system and method for realizing 1588 time synchronizations in OTN equipment room |
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| CN107070576A true CN107070576A (en) | 2017-08-18 |
| CN107070576B CN107070576B (en) | 2019-03-01 |
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| WO (1) | WO2018166223A1 (en) |
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| WO2018166223A1 (en) * | 2017-03-15 | 2018-09-20 | 烽火通信科技股份有限公司 | System and method for realizing 1588 time synchronization between otn devices |
| CN109787703A (en) * | 2019-02-28 | 2019-05-21 | 烽火通信科技股份有限公司 | A kind of modification method of timestamp, clock synchronizing method and system |
| WO2021073444A1 (en) * | 2019-10-15 | 2021-04-22 | 中兴通讯股份有限公司 | Synchronization method and apparatus, device and storage medium |
| CN114866175A (en) * | 2021-02-03 | 2022-08-05 | 华为技术有限公司 | Communication method and device |
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| WO2018166223A1 (en) * | 2017-03-15 | 2018-09-20 | 烽火通信科技股份有限公司 | System and method for realizing 1588 time synchronization between otn devices |
| CN109787703A (en) * | 2019-02-28 | 2019-05-21 | 烽火通信科技股份有限公司 | A kind of modification method of timestamp, clock synchronizing method and system |
| CN109787703B (en) * | 2019-02-28 | 2020-08-25 | 烽火通信科技股份有限公司 | Timestamp correction method, clock synchronization method and system |
| WO2021073444A1 (en) * | 2019-10-15 | 2021-04-22 | 中兴通讯股份有限公司 | Synchronization method and apparatus, device and storage medium |
| CN114866175A (en) * | 2021-02-03 | 2022-08-05 | 华为技术有限公司 | Communication method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107070576B (en) | 2019-03-01 |
| WO2018166223A1 (en) | 2018-09-20 |
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