CN107070576B - A kind of system and method for realizing 1588 time synchronizations in OTN equipment room - Google Patents
A kind of system and method for realizing 1588 time synchronizations in OTN equipment room Download PDFInfo
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- CN107070576B CN107070576B CN201710154138.0A CN201710154138A CN107070576B CN 107070576 B CN107070576 B CN 107070576B CN 201710154138 A CN201710154138 A CN 201710154138A CN 107070576 B CN107070576 B CN 107070576B
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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
Abstract
The present invention relates to network communication fields, disclose a kind of system for realizing 1588 time synchronizations in OTN equipment room, including transmitting terminal and receiving end, transmitting terminal includes that time stamp device and OTN expense frame framing device are beaten in connected time message transmission, receiving end includes that connected OTN expense frame frame decoding device and time message reception beat time stamp device, wherein, transmitting terminal and receiving end are equipped in two OTN equipment, and the OTN expense frame framing device of transmitting terminal is connected with the OTN expense frame frame decoding device of receiving end in another OTN equipment in an OTN equipment.The invention also discloses a kind of methods for realizing 1588 time synchronizations in OTN equipment room.The present invention can make the interaction of two OTN equipment rooms progress time synchronization message.
Description
Technical field
The present invention relates to network communication fields, and in particular to a kind of system for realizing 1588 time synchronizations in OTN equipment room
With a kind of method for realizing 1588 time synchronizations in OTN equipment room.
Background technique
Time synchronization function is time calibration approach important between transmission device and transmission device, especially with it is real-time
In the property very high business of the degree of correlation or transmission device, time synchronization function more seems important.1588 time synchronization function energy
Enough reach the time synchronization of nanosecond dimension accuracy, the far superior to time synchronizing method of other way, thus by most of transmission
Equipment is used.1588 time synchronizations, full name IEEE1588 time synchronization are a kind of essences for network measure and control system
Close clock synchronization protocol.
According to the regulation of IEEE1588V2 agreement, the main carriers of time synchronization message (or PTP message) are Ethernet
Message.In different types of transmission device, the transmission path of time message is also different, such as in PTN (Packet
Transport Network, Packet Transport Network) in equipment, the transmission path and the transmission path phase of service message of time message
Together, i.e., mixed biography is carried out on Ethernet path, but OTN (Optical Transport Network, optical transfer network) is set
Standby, ITU-T tissue has issued newest G.709 standard, for realizing the time synchronization in OTN equipment, thus each factory at present
Quotient is the realization that 1588 time synchronization functions are carried out according to oneself OTN equipment feature, but between two PTN devices, mesh
Before also lack a kind of preferable time synchronization message interaction mode for realizing 1588 time synchronization functions of two OTN equipment rooms.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind realizes 1588 in OTN equipment room
The system of time synchronization and a kind of method for realizing 1588 time synchronizations in OTN equipment room, make two OTN equipment rooms carry out the time same
Walk the interaction of message.
To achieve the above objectives, the technical solution adopted by the present invention is that, comprising:
Transmitting terminal comprising time stamp device and OTN expense frame framing device, the time are beaten in connected time message transmission
Message, which is sent, beats time stamp device for carrying out the replacement of time stamp and amendment domain to time message, and by replaced time message
The OTN expense frame framing device progress GFP-F is sent to encode to form OTN expense frame data stream and send；
Receiving end comprising time stamp device, the OTN are beaten in connected OTN expense frame frame decoding device and time message reception
Expense frame frame decoding device decodes to obtain time message for receiving OTN expense frame data stream to OTN expense frame data stream, so
Time message is sent to the time message afterwards and receives the replacement beaten time stamp device and carry out time stamp and amendment domain；
Wherein, transmitting terminal and receiving end are equipped in two OTN equipment, and in an OTN equipment transmitting terminal OTN expense frame group
Frame device is connected with the OTN expense frame frame decoding device of receiving end in another OTN equipment.
Based on the above technical solution, the both ends of the transmitting terminal are separately connected time message data frame input bus
With OTN expense frame output bus, the both ends of the receiving end are separately connected OTN expense frame input bus and time message data frame
Output bus, and in an OTN equipment in the OTN expense frame output bus of transmitting terminal and another OTN equipment receiving end OTN expense
Frame input bus is connected.
The invention also discloses a kind of methods for realizing 1588 time synchronizations in OTN equipment room, comprising:
S1: in an OTN equipment, the time stamp field of the time message of time message data frame input bus input is replaced
For equipment current time value, and the amendment domain field of time message is replaced in equipment current time value and time message and is had
Difference between time stamp, the equipment current time value are the current time value that time message is presently in OTN equipment；
S2: will replacement treated that time message is filled in the OTN expense frame MFAS of sending direction, to OTN expense frame
MFAS carries out GFP-F coding, forms OTN expense frame data stream and is sent to another OTN equipment；
S3: another OTN equipment receives OTN expense frame data stream, and is decoded processing to OTN expense frame data stream and obtains
The OTN expense frame MFAS of time message and receiving direction；
S4: replacing with equipment current time value for the time stamp field of time message, and by the amendment domain field of time message
The difference having between time stamp in equipment current time value and time message is replaced with, time stamp field and amendment then will be substituted
The time message of domain field is exported through time message data frame output bus.
Based on the above technical solution, S1 specifically:
S101: the OTN expense frame MFAS of receiving time message and the sending direction in OTN expense frame interface；
S102: the time stamp in time message and amendment domain position are found out；
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 having between time stamp in equipment current time value and time message.
Based on the above technical solution, S2 specifically:
S201: increase frame header fields before the OTN expense frame MFAS of sending direction, time message is filled in transmission
In the subsequent field of the OTN expense frame MFAS in direction；
S202: adding the crc field of 4 bytes after the time message being located on OTN expense frame MFAS, forms OTN and opens
Frame data stream is sold, the verification range of the crc field is all bytes of time message；
S203: scrambling code processing is carried out to OTN expense frame data stream.
Based on the above technical solution, in OTN expense frame data stream write-in route OTN traffic frame, then from
One OTN equipment is transmitted to another OTN equipment.
Based on the above technical solution, S3 specifically:
S301: being decoded OTN expense frame data stream and decoding process, obtains the OTN of time message and receiving direction
Expense frame MFAS；
S302: verifying time message, judges whether time message is filled in the OTN expense frame of sending direction before
Time message in MFAS, if so, retaining, if it is not, then abandoning.
Based on the above technical solution, it after the OTN expense frame data stream carries out the processing of GFP framing, then is solved
Code and decoding process.
Based on the above technical solution, S4 specifically:
S401: the time stamp in time message and amendment domain position are found out；
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 having between time stamp in equipment current time value and time message, and time stamp field then will be substituted and repair
The time message of positive domain field is exported through time message data frame output bus.
Compared with prior art, the present invention is a kind of is in the advantages of system of OTN equipment room 1588 time synchronizations of realization:
Be equipped with transmitting terminal and receiving end in two OTN equipment, by the OTN expense frame framing device in transmitting terminal, to time message into
Row GFP-F coding encapsulation, so that time message is transmitted in two OTN equipment rooms, the interaction of deadline message, thus
Realize 1588 time synchronizations of OTN equipment room.
The present invention is a kind of to be in the advantages of method of OTN equipment room 1588 time synchronizations of realization: by time message
It carries out time stamp and corrects the replacement of domain numerical value, carry out time calibration, then time message is filled in the OTN expense of sending direction
In frame MFAS, GFP-F coding is carried out, so that ethernet frame is placed on to one in the form of load transmits auxiliary lattice for non-Ethernet
Inside formula, in order to be transmitted in two OTN equipment, so that the time message in an OTN equipment be made to reach another OTN equipment
In, the interaction of time message is carried out, is then again carried out to time message time calibration, to complete the 1588 of two OTN equipment
Time synchronization.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the system that 1588 time synchronizations are realized in OTN equipment room of the present invention；
Fig. 2 is a kind of flow chart for the method that 1588 time synchronizations are realized in OTN equipment room of the present invention.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Shown in Figure 1, the present invention provides a kind of system for realizing 1588 time synchronizations in OTN equipment room, for two
OTN equipment room realizes 1588 time synchronizations, comprising: transmitting terminal and receiving end is equipped in two OTN equipment, transmitting terminal includes being connected
Time message transmission beat time stamp device and OTN expense frame framing device, time message transmission is beaten time stamp device and is used for the time
Message carries out time stamp and corrects the replacement in domain, and replaced time message is sent to the OTN expense frame framing device
Carry out GFP-F encode to form OTN expense frame data stream and send, i.e., ethernet frame is placed in the form of load one for it is non-with
Too inside net transmission subformat, in order to be transmitted in two OTN equipment, receiving end includes connected OTN expense frame frame decoding
Time stamp device is beaten in device and time message reception, and OTN expense frame frame decoding device is used to receive OTN expense frame data stream, and to OTN
Expense frame data stream decodes to obtain time message, then by time message be sent to time message reception beat time stamp device into
Row time stamp and the replacement for correcting domain, and in an OTN equipment in the OTN expense frame framing device of transmitting terminal and another OTN equipment
The OTN expense frame frame decoding device of receiving end is connected.
The both ends of transmitting terminal are separately connected time message data frame input bus and OTN expense frame output bus, receiving end
Both ends be separately connected OTN expense frame input bus and time message data frame output bus, and transmitting terminal in an OTN equipment
OTN expense frame output bus is connected with the OTN expense frame input bus of receiving end 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
Input time message in time stamp device is beaten, OTN expense frame framing device connects OTN expense frame output bus, OTN expense frame frame decoding
Device connects OTN expense frame input bus, and time stamp device Connection Time message data frame output bus is beaten in time message reception, when
Between message data frame output bus be used for will carry out time stamp and correct domain replacement time message output.
Shown in Figure 2, the present invention also provides a kind of to realize 1588 time synchronizations in OTN equipment room based on above system
Method, comprising:
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 having between time stamp in equipment current time value and time message, and the step is in the time
Message transmission, which is beaten in time stamp device, to be completed, and time message is beaten by the transmission of time message data frame input bus input time message
In time stamp device.Equipment current time value is the current time value that time message is presently in OTN equipment.It is specific:
S101: the OTN expense frame MFAS (Multi- of receiving time message and the sending direction in OTN expense frame interface
Frame Alignment Signal, multiframe alignment byte), the OTN expense frame MFAS of sending direction is sent out by OTN expense frame interface
It send to time message transmission and beats time stamp device；
S102: the time stamp in time message and amendment domain position are found out；
S103: replacing with equipment current time value for the time stamp field of time message, and by the amendment domain word of time message
Section replaces with the difference having between time stamp in equipment current time value and time message.
S2: by above-mentioned replacement, treated that time message is filled in the OTN expense frame MFAS of sending direction, opens OTN
It sells frame MFAS and carries out GFP-F coding, form OTN expense frame data stream and be sent to another OTN equipment, i.e., by ethernet frame to carry
The form of lotus is placed on one and transmits inside subformat for non-Ethernet, in order to be transmitted in two OTN equipment, GFP mono-
Kind is common to be placed on ethernet frame one frame tunneling transmitted inside subformat for non-Ethernet in the form of load,
GFP-F is the frame tunneling for the frame mapped mode in both of which used by different business data.The step is in OTN
It completes, specifically includes in expense frame framing device:
S201: increase frame header fields before the OTN expense frame MFAS of sending direction, time message is filled in transmission
In the subsequent field of the OTN expense frame MFAS in direction；
S202: adding the crc field of 4 bytes after the time message being located on OTN expense frame MFAS, forms OTN and opens
Frame data stream is sold, crc field is school searching section, and the verification range of crc field is all bytes of time message；
S203: scrambling code processing is carried out to OTN expense frame data stream, avoids other effect of signals OTN expense frame data stream, so
OTN expense frame data stream is written in route OTN traffic frame afterwards, the OTN expense frame data in route OTN traffic frame are then written
Stream is transmitted to another OTN equipment from an OTN equipment, specifically, the OTN expense frame data circulation in write-in route OTN traffic frame
OTN expense frame output bus and OTN expense frame input bus are crossed, is transmitted in another OTN equipment from an OTN equipment.
S3: another OTN equipment receives OTN expense frame data stream, and is decoded processing to OTN expense frame data stream and obtains
The OTN expense frame MFAS of time message and receiving direction；The step is completed in OTN expense frame frame decoding device, specifically includes:
S301: being decoded OTN expense frame data stream and decoding process, obtains the OTN of time message and receiving direction
Expense frame MFAS；
S302: verifying time message, judges whether time message is filled in the OTN expense frame of sending direction before
Time message in MFAS, if so, retaining, if it is not, then abandoning.
S4: replacing with equipment current time value for the time stamp field of time message, and by the amendment domain field of time message
The difference having between time stamp in equipment current time value and time message is replaced with, time stamp field and amendment then will be substituted
The time message of domain field is exported through time message data frame output bus.The step is beaten in time stamp device in time message reception
It completes, specifically includes:
S401: the time stamp in time message and amendment domain position are found out；
S402: replacing with equipment current time value for the time stamp field of time message, and by the amendment domain word of time message
Section replaces with the difference having between time stamp in equipment current time value and time message, and time stamp field then will be substituted and repair
The time message of positive domain field is exported through time message data frame output bus, i.e. output is received OTN expense frame data stream
OTN equipment, thus complete two OTN equipment rooms time synchronization.
The method for realizing 1588 time synchronizations in OTN equipment room of the 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 frame MFAS of sending direction, into
Row GFP-F coding transmits inside subformat so that ethernet frame to be placed on to 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 be made to reach in another OTN equipment, carries out time report
Then the interaction of text carries out time calibration to time message again, to complete 1588 time synchronizations of two OTN equipment.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (8)
1. a kind of system for realizing 1588 time synchronizations in OTN equipment room, for realizing that 1588 times are same in two OTN equipment rooms
Step characterized by comprising
Transmitting terminal comprising time stamp device and OTN expense frame framing device, the time message are beaten in connected time message transmission
It sends and beats time stamp device for carrying out time stamp to time message and correcting the replacement in domain, and replaced time message is sent
GFP-F is carried out to the OTN expense frame framing device to encode to form OTN expense frame data stream and send；
Receiving end comprising time stamp device, the OTN expense are beaten in connected OTN expense frame frame decoding device and time message reception
Frame frame decoding device decodes to obtain time message for receiving OTN expense frame data stream to OTN expense frame data stream, then will
Time message is sent to the time message and receives the replacement beaten time stamp device progress time stamp and correct domain；
Wherein, transmitting terminal and receiving end are equipped in two OTN equipment, and the OTN expense frame framing of transmitting terminal fills in an OTN equipment
It sets and is connected with the OTN expense frame frame decoding device of receiving end in another OTN equipment；
The both ends of the transmitting terminal are separately connected time message data frame input bus and OTN expense frame output bus, described to connect
The both ends of receiving end are separately connected OTN expense frame input bus and time message data frame output bus, and send in an OTN equipment
The OTN expense frame output bus at end is connected with the OTN expense frame input bus of receiving end in another OTN equipment.
2. a kind of method for realizing 1588 time synchronizations in OTN equipment room based on system described in claim 1, feature exist
In, comprising:
S1: in an OTN equipment, the time stamp field of the time message of time message data frame input bus input is replaced with and is set
Standby current time value, and the amendment domain field of time message is replaced with and has time stamp in equipment current time value and time message
Between difference, the equipment current time value is that time message is presently in the current time value of OTN equipment；
S2: will replacement treated that time message is filled in the OTN expense frame MFAS of sending direction, to OTN expense frame MFAS
GFP-F coding is carried out, OTN expense frame data stream is formed and is sent to another OTN equipment；
S3: another OTN equipment receives OTN expense frame data stream, and is decoded processing to OTN expense frame data stream and obtains the time
The OTN expense frame MFAS of message and 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
To have the difference between time stamp in equipment current time value and time message, time stamp field and amendment domain word then will be substituted
The time message of section is exported through time message data frame output bus.
3. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 2, which is characterized in that S1 tool
Body are as follows:
S101: the OTN expense frame MFAS of receiving time message and the sending direction in OTN expense frame interface；
S102: the time stamp in time message and amendment domain position are found out；
S103: time stamp field in time message is replaced with into equipment current time value, and is replaced domain field is corrected in time message
It is changed to the difference having between time stamp in equipment current time value and time message.
4. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 3, which is characterized in that S2 tool
Body are as follows:
S201: increase frame header fields before the OTN expense frame MFAS of sending direction, time message is filled in sending direction
OTN expense frame MFAS subsequent field in；
S202: adding the crc field of 4 bytes after the time message being located on OTN expense frame MFAS, forms OTN expense frame
Data flow, the verification range of the crc field are all bytes of time message；
S203: scrambling code processing is carried out to OTN expense frame data stream.
5. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 4, it is characterised in that: described
OTN expense frame data stream is written in route OTN traffic frame, is then transmitted to another OTN equipment from an OTN equipment.
6. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 4, which is characterized in that S3 tool
Body are as follows:
S301: being decoded OTN expense frame data stream and decoding process, obtains the OTN expense of time message and receiving direction
Frame MFAS；
S302: verifying time message, judges whether time message is filled in the OTN expense frame MFAS of sending direction before
In time message, if so, retain, if it is not, then abandoning.
7. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 6, it is characterised in that: described
After OTN expense frame data stream carries out the processing of GFP framing, then it is decoded and decoding process.
8. a kind of method for realizing 1588 time synchronizations in OTN equipment room as claimed in claim 7, which is characterized in that S4 tool
Body are as follows:
S401: the time stamp in time message and amendment domain position are found out；
S402: time stamp field in time message is replaced with into equipment current time value, and is replaced domain field is corrected in time message
It is changed to the difference having between time stamp in equipment current time value and time message, time stamp field and amendment domain then will be substituted
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)
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| 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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| CN107070576B true CN107070576B (en) | 2019-03-01 |
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| CN107070576B (en) * | 2017-03-15 | 2019-03-01 | 烽火通信科技股份有限公司 | A kind of system and method for realizing 1588 time synchronizations in OTN equipment room |
| 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 |
| CN112672235A (en) * | 2019-10-15 | 2021-04-16 | 中兴通讯股份有限公司 | Synchronization method, device, equipment 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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| CN105846941B (en) * | 2016-05-23 | 2018-09-11 | 西安电子科技大学 | Clock transparent transmission device and method based on 1588 standards of IEEE |
| CN107070576B (en) * | 2017-03-15 | 2019-03-01 | 烽火通信科技股份有限公司 | A kind of system and method for realizing 1588 time synchronizations in OTN equipment room |
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- 2017-03-15 CN CN201710154138.0A patent/CN107070576B/en active Active
- 2017-11-08 WO PCT/CN2017/109845 patent/WO2018166223A1/en active Application Filing
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| CN101997669A (en) * | 2009-08-14 | 2011-03-30 | 中兴通讯股份有限公司 | Time correction method and system of time synchronization protocol beared by optical transport network |
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| CN107070576A (en) | 2017-08-18 |
| WO2018166223A1 (en) | 2018-09-20 |
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