CN103166738B - A kind of device and method for measuring both-end LOF - Google Patents
A kind of device and method for measuring both-end LOF Download PDFInfo
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- CN103166738B CN103166738B CN201110427269.4A CN201110427269A CN103166738B CN 103166738 B CN103166738 B CN 103166738B CN 201110427269 A CN201110427269 A CN 201110427269A CN 103166738 B CN103166738 B CN 103166738B
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Abstract
The invention discloses a kind of device and method for measuring both-end LOF, described device device includes：The frame count numerical value carried in TxFCf, RxFCb and TxFCb field is extracted in the quick CCM frames that field programmable gate array (FPGA) module is used to send from remote equipment, and is sent to both-end LOF measurement (D LM) module；The D LM modules are used for using the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received, carry out the LOF measurement of local terminal and distal end.After the present invention, by FPGA high disposal performance, the higher both-end LOF measurement based on quick CCM frames of precision can be realized.
Description
Technical field
The present invention relates to communications industry terminal access technology field, more particularly to a kind of device for measuring both-end LOF and
Method.
Background technology
Both-end LOF measurement (Dual-ended ETH-LM, abbreviation DLM) function is to be based on International Telecommunication Union ITU-T
Y.1731 the basic function of standard.It is being configured with correct maintenance entity group (Maintenance Entity Group, abbreviation
MEG) and after safeguarding boundary point (Maintenance End Point, abbreviation MEP), the general principle of both-end LOF measurement is such as
Under：
MEP sends both-end frame (the Continuity Check with ETH-LM information to its reciprocity opposite end MEP
Message, abbreviation CCM frame), while also the CCM frames with ETH-LM information are received to carry out both-end from its reciprocity opposite end MEP
LOF measures.Both-end LOF measurement is initiated by either party MEP for sending CCM frames and is responsible for LOF calculating, Ren Heyi
TxFCf, RxFCb, TxFCb field and local frame count pick up in 2 CCM frames that square MEP is continuously received before and after
Device value calculates local terminal LOF and distal end LOF.Wherein, the value of TxFCf fields represents locally to count when CCM frames transmit
Device TxFCl numerical value；The value of RxFCb fields represents the local counter when receiving last CCM frame from reciprocity MEP
RxFCl numerical value；The value of TxFCb fields represents the numerical value of the TxFCf in last the CCM frame received from reciprocity MEP.
Fig. 1 is the frame structure schematic diagram of prior art CCM frames.In a CCM frame, the value of MEL fields represents MEG etc.
Level；Version fields represent version information, and numerical value is always 0；OpCode fields represent CCM PDU types values；Flags fields
For marker bit；TLV Offset fields represent TLV (Type-Length-Value, type lengths values) bias, and fixation is set to
70；Sequence Number fields represent sequence number, and the value of this field is set to complete zero；The value of MEP id fields is one 13 ratio
Special integer value, for identifying the MEP sent in MEG；MEG id fields are the fields of 48 bytes；TxFCf、TxFCb、
RxFCb fields are the integer value of 4 bytes, and it carries the sample value for the frame counter that can be zeroed, and these fields are set in the not used time
For complete zero；Reserved fields are reserved field, are generally set to complete zero；End TLV fields are end of a period TLV.
But there is following defect in prior art：It is simple to rely on CPU (Central Processing Unit, central processing
Device) high-precision measurement can not be realized to the both-end LOF based on quick CCM frames (it sends the cycle no more than 100 milliseconds).
The content of the invention
It is a primary object of the present invention to provide a kind of device and method for measuring both-end LOF, to solve above-mentioned list
Pure dependence CPU can not realize high-precision measurement problem to the both-end LOF based on quick CCM frames.
To solve the above problems, the invention provides a kind of device for measuring both-end LOF, including：
Field programmable gate array (FPGA) module be used in the quick CCM frames sent from remote equipment extracting TxFCf,
The frame count numerical value carried in RxFCb and TxFCb fields, and it is sent to both-end LOF measurement (D-LM) module；
The D-LM modules are used for using the frame count carried in TxFCf, RxFCb and TxFCb field received
Numerical value, carry out the LOF measurement of local terminal and distal end.
Further,
The D-LM modules are used for using the frame count carried in TxFCf, RxFCb and TxFCb field received
Numerical value, the LOF measurement of local terminal and distal end is carried out, is specifically included：
The LOF of the distal end is equal to the absolute value and front and rear continuous two of the front and rear TxFCb received twice in succession difference
The difference of the absolute value of the secondary RxFCb received difference；
The LOF of the local terminal is equal to the absolute value and front and rear continuous two of the front and rear TxFCf received twice in succession difference
The difference of the absolute value of the secondary RxFCl received difference.
Further,
The D-LM modules are additionally operable to produce the frame count number for filling TxFCf, RxFCb and TxFCb field in quick CCM frames
Value, and it is sent to the FPGA module；
The FPGA module is additionally operable to the frame count numerical value phase for assembling quick CCM frames and sending the D-LM modules
After being filled into TxFCf, RxFCb and TxFCb field in the quick CCM frames with answering, the quick CCM frames are sent.
Further,
The D-LM modules are additionally operable to produce the frame count number for filling TxFCf, RxFCb and TxFCb field in quick CCM frames
Value, is specifically included：
The D-LM is used for after the solicited message that the FPGA module is sent is received, and produces and fills in quick CCM frames
The frame count numerical value of TxFCf, RxFCb and TxFCb field.
Further, described device also includes：
Drive module, for transmitting frame count numerical value between the D-LM modules and the FPGA module and with confidence
Breath；Wherein, the configuration information is configuration parameter information required when the FPGA module starts.
Correspondingly, present invention also offers a kind of method for measuring both-end LOF, applied to including field programmable gate
In the equipment of array (FPGA) module and both-end LOF measurement (D-LM) module, including：
Extracted in the quick CCM frames that the FPGA module is sent from remote equipment in TxFCf, RxFCb and TxFCb field
The frame count numerical value of carrying, and it is sent to the D-LM modules；
The D-LM modules use the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received,
Carry out the LOF measurement of local terminal and distal end.
Further,
The D-LM modules use the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received,
The LOF measurement of local terminal and distal end is carried out, is specifically included：
The LOF of the distal end is equal to the absolute value and front and rear continuous two of the front and rear TxFCb received twice in succession difference
The difference of the absolute value of the secondary RxFCb received difference；
The LOF of the local terminal is equal to the absolute value and front and rear continuous two of the front and rear TxFCf received twice in succession difference
The difference of the absolute value of the secondary RxFCl received difference.
Further, methods described also includes：
The D-LM modules produce the frame count numerical value for filling TxFCf, RxFCb and TxFCb field in quick CCM frames, and
It is sent to the FPGA module；
The frame count numerical value that the FPGA module assembles quick CCM frames and sends the D-LM modules is correspondingly filled out
After being charged to TxFCf, RxFCb and TxFCb field in the quick CCM frames, the quick CCM frames are sent.
Further,
The D-LM modules produce the frame count numerical value for filling TxFCf, RxFCb and TxFCb field in quick CCM frames, tool
Body includes：
The D-LM after the solicited message that the FPGA module is sent is received, produce fill TxFCf in quick CCM frames,
The frame count numerical value of RxFCb and TxFCb fields.
After the present invention, by field programmable gate array (Field-Programmable Gate Array, abbreviation
For FPGA) high disposal performance, can realize precision it is higher based on quick CCM frames both-end LOF measurement.
Brief description of the drawings
Fig. 1 is the frame structure schematic diagram of prior art CCM frames；
Fig. 2 is the schematic diagram according to the both-end LOF measurement apparatus of apparatus of the present invention embodiment one；
Fig. 3 is the schematic diagram according to the both-end LOF measuring system of present system embodiment one；
Fig. 4 is the flow chart according to the both-end LOF measuring method of the inventive method embodiment one；
Fig. 5 is the flow chart handled according to FPGA module in the both-end LOF measuring method of the inventive method embodiment two；
Fig. 6 is the flow chart according to D-LM resume modules in the both-end LOF measuring method of the inventive method embodiment two.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Field programmable gate array (Field-Programmable Gate Array, referred to as FPGA) processing message
Performance is higher than common CP U process performance, due to belonging to the category of hardware handles, is realized in physical layer, therefore can be fine
Satisfaction to rapid message carry out timely processing requirement.The present embodiment is realized high-precision based on quick based on FPGA module
The both-end LOF measurement of CCM frames, the network transmission quality that can correctly reflect between current measuring node equipment.
In the present embodiment, a kind of device for measuring both-end LOF, including：D-LM modules and FPGA module.Wherein,
Extracted in the quick CCM frames that FPGA module is used to send from opposite end MEP in field TxFCf, RxFCb and TxFCb
The frame count numerical value of carrying, and it is sent to D-LM modules；Can also be used to assembling quick CCM frames and be in the frame TxFCf,
After RxFCb and TxFCb field infilled frame count values, the quick CCM frames are sent；
D-LM modules are used to, using the frame count numerical value carried in field TxFCf, RxFCb and the TxFCb received, carry out
The LOF measurement of local terminal and distal end；It is additionally operable to produce the frame count number of TxFCf, RxFCb and TxFCb field in filling CCM frames
Value, and it is sent to FPGA module；
In addition, it can also include in said apparatus：Drive module, for transmitting frame between D-LM modules and FPGA module
Count value and configuration information；Wherein, included in the configuration information：FPGA module starts required configuration parameter information.
In embodiments of the present invention, a kind of both-end LOF measuring system, including local device and opposite equip., local terminal are set
It is standby to be connected with opposite equip. by network, FPGA module and D-LM modules are included in local device and opposite equip., wherein：This
D-LM modules or opposite end D-LM modules are held, is respectively used to produce and fills the field such as TxFCf, RxFCb and TxFCb in quick CCM frames
Frame count numerical value, the FPGA module being sent in same equipment；Local terminal FPGA module or opposite end FPGA module, are respectively used to group
After filling quick CCM frames and filling the frame count numerical value of field such as TxFCf, RxFCb and TxFCb in the frame, quick CCM is sent
Frame；Local terminal D-LM modules or opposite end D-LM modules, be also respectively used to using TxFCf, RxFCb in the quick CCM frames that receive and
The frame count numerical value such as TxFCb, carry out the LOF measurement of local terminal and distal end；Local terminal FPGA module or opposite end FPGA module, also divide
The quick CCM frames that other MEP are sent Yong Yu not parsed and therefrom extract the frame count number in field TxFCf, RxFCb and TxFCb
Value, and the D-LM modules being sent in Unified Device.
In the present embodiment, a kind of both-end LOF measuring method, completed by local terminal and opposite end, local terminal and opposite end include
FPGA module and D-LM modules, wherein：Local terminal D-LM modules or opposite end D-LM modules produce in the quick CCM frames of filling respectively
The frame count numerical value of TxFCf, RxFCb and TxFCb field, and FPGA module is sent to by drive module；Local terminal FPGA module
Or opposite end FPGA module, after assembling quick CCM frames as TxFCf, RxFCb and TxFCb field filling frame counting information in the frame,
Send quick CCM frames；Local terminal D-LM modules or opposite end D-LM modules, the quick CCM frames also sent using FPGA module is received
The frame count numerical value such as middle TxFCf, RxFCb and TxFCb, carry out the LOF measurement of local terminal and distal end；Local terminal FPGA module is right
FPGA module is held, parses the frame for from other MEP quick CCM frames received and therefrom extracting TxFCf, RxFCb and TxFCb field
Count value is sent to respective D-LM modules.
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.The implementation of the present invention is made below
It is further to describe in detail.
Device embodiment one：
Fig. 2 is the schematic diagram according to the measuring frame delay device of apparatus of the present invention embodiment one.As shown in Fig. 2 the present embodiment
In, both-end LOF measurement apparatus includes：Both-end LOF measurement D-LM modules 201, for produce TxFCf in quick CCM frames,
Frame count numerical value corresponding to the fields such as RxFCb and TxFCb；FPGA module 202, for assembling quick CCM frames and filling wherein
After the count areas such as TxFCf, RxFCb and TxFCb, quick CCM frames are sent；D-LM modules 201, it is also used for receiving fast
The frame count numerical value such as TxFCf, RxFCb and TxFCb in fast CCM frames, carry out the LOF measurement of local terminal and distal end；FPGA module
202, the quick CCM frames for being additionally operable to send opposite end MEP parse and therefrom extract the frame meters such as TxFCf, RxFCb and TxFCb
After number numerical value, D-LM modules 201 are issued.
In the present embodiment, measuring frame delay device can also include：Drive module, for D-LM modules and FPGA module it
Between frame count data and configuration information transmission.
The present embodiment realizes that the high-precision both-end LOF based on quick CCM frames is surveyed based on hardware FPGA high disposal performance
Amount, overcoming in the prior art dependence CPU merely can not be to based on quick CCM frame (its transmission cycle, which is equal to, is less than 100 milliseconds)
Both-end LOF the problem of realizing high-acruracy survey, so as to accurately reflect network transmission between current measuring node equipment
Quality.
System embodiment one：
For both-end LOF measurement each time, it is necessary to completed by the equipment cooperation at both ends.According to Fig. 3
The schematic diagram of the measuring frame delay system of present system embodiment one.As shown in figure 3, in the present embodiment, both-end LOF measurement
System includes local terminal 301 and opposite end 302, and local terminal 301 is connected with opposite end 302 by network.
Local terminal 301 and opposite end 302 include FPGA module and D-LM modules, wherein：Local terminal D-LM modules, it is fast for producing
The frame count numerical value corresponding to field such as TxFCf, RxFCb and TxFCb in fast CCM frames；Local terminal or opposite end FPGA module, assembling are quick
After CCM frames and the filling wherein count area such as TxFCf, RxFCb and TxFCb, quick CCM frames are sent；Local terminal or opposite end D-LM moulds
Block, the frame count numerical value such as TxFCf, RxFCb and TxFCb in the quick CCM frames that receive is also used for, carries out local terminal and distal end
LOF measurement；Local terminal or opposite end FPGA module, parsing is additionally operable to from the opposite end MEP quick CCM frames received and is therefrom carried
The frame count such as TxFCf, RxFCb and TxFCb numerical value is taken to respective D-LM modules.
In the present embodiment, local terminal D-LM modules and opposite end D-LM modules, it is additionally operable to maintenance entity group MEG respectively and safeguards side
Boundary point MEP parameter configuration, configuration parameter is converted into list item corresponding to corresponding FPGA, and starts both-end LOF measurement work(
Energy.Local terminal drive module and opposite end drive module, for carrying out the frame count number of corresponding FPGA module and D-LM modules respectively
Transmitted according to configuration parameter, FPGA module corresponding to initialization.
It is any to support ITU-T Y.1731 carry out high-precision both-end frame between the equipment of standard in the present embodiment
Measurement is lost, correctly reflects network transmission quality between current measuring node equipment, traditional simple CPU that relies on is solved and carries out
The technical barrier of measurement accuracy deficiency under both-end LOF metering system.
Embodiment of the method one：
In the present embodiment, realize that Y.1731 middle both-end LOF measures (Dual-Ended ETH-LM) function to ITU-T
Device, including：FPGA module：It is main to be embodied as carrying out the assembling of CCM frames and transmission in sending direction；CCM is carried out receiving direction
Frame parses.D-LM modules：The frame count corresponding to field such as TxFCf, RxFCb and TxFCb in sending direction produces quick CCM frames
Numerical value, and FPGA module is notified by drive module；The frame count number reported is interrupted by drive module receiving direction processing
Value, complete both-end LOF measurement function.Drive module：For FPGA module and D-LM module intercommunications, by under D-LM modules
Configuration information is converted to list item corresponding to FPGA；The frame statistical information that D-LM modules issue is transmitted to FPGA module；By FPGA
The frame statistical information parsed from CCM frames is handled by interrupt notification D-LM modules；
Fig. 4 is the flow chart according to the both-end LOF measuring method of the inventive method embodiment one.As shown in figure 4, this reality
Applying example includes：
Step S401, local terminal and opposite end D-LM modules are generated for filling TxFCf, RxFCb and TxFCb in quick CCM frames
FPGA module is sent to etc. frame count numerical value corresponding to field, and by drive module；
Step S402, local terminal and opposite end FPGA module assemble respectively quick CCM frames and fill wherein TxFCf, RxFCb and
After the count areas such as TxFCb, quick CCM frames are sent；
Step S403, opposite end and local terminal FPGA module are parsed from the opposite end MEP quick CCM frames received and therefrom carried respectively
The frame count numerical value such as TxFCf, RxFCb and TxFCb is taken, respective D-LM modules are sent to by drive module；
Step S404, opposite end and local terminal D-LM modules using drive module by interrupt TxFCf, RxFCb for reporting and
The frame count numerical value such as TxFCb, carry out the LOF measurement of local terminal and distal end.
Specifically, from the point of view of technical scheme is complete, the present embodiment can include：1) D-LM modules are responsible for generation use
In filling the frame count numerical value corresponding to field such as TxFCf, RxFCb and TxFCb in quick CCM frames, it is sent to by drive module
FPGA processing；2) FPGA is assembled quick CCM frames and provided using D-LM modules technical information filling wherein TxFCf, RxFCb and
After the count areas such as TxFCb, quick CCM frames are sent；3) D-LM modules complete both-end LOF survey calculation.
Embodiment of the method two：
In the present embodiment, coupling apparatus embodiment one, is carried out detailed system embodiment one to double frame LOF measuring methods
Describe in detail bright.Similarly, each feature in the present embodiment both-end LOF measuring method may be equally applicable to said apparatus embodiment
And system embodiment.
The present embodiment will be illustrated from FPGA module and D-LM modules, and high-precision both-end frame is realized based on FPGA module
Measuring method is lost, its function is realized jointly by FPGA module and D-LM modules by drive module.
Fig. 5 is the flow chart handled according to FPGA module in the both-end LOF measuring method of the inventive method embodiment two.
As shown in figure 5, FPGA module handling process includes：
Step S501：D-LM modules are on demand by drive module by the CCM transmitter registers and both-end in FPGA module
LOF register puts 1 enabled, the quick CCM frames of FPGA assemblings, while notifies D-LM modules by drive module with interrupt mode,
Obtained from the D-LM modules and fill the frame count numerical value corresponding to field such as TxFCf, RxFCb and TxFCb in quick CCM frames；
Step S502：FPGA module after D-LM modules get frame count statistical value, is first filled with by drive module
The field such as TxFCf, RxFCb and TxFCb in the quick CCM frames assembled in step S501, finally by network by CCM frames
Send to opposite end MEP；
Step S503：FPGA module first determines whether CCM frame structure (such as accompanying drawings after opposite end MEP receives quick CCM frames
1) whether OpCode fields are 1 in, if it is, going to step S504；Otherwise, abandon；
Step S504：FPGA module parses CCM frames, and legitimacy detection is carried out to CCM frames, if after detection passes through, turning step
Rapid S505；Otherwise, abandon；
Step S505：FPGA module continues to parse CCM frames, extracts the frame count such as TxFCf, RxFCb and TxFCb statistics in frame
Field, these field contents are reported by D-LM modules with interrupt mode by drive module.
Fig. 6 is the flow chart according to D-LM resume modules in the both-end LOF measuring method of the inventive method embodiment two.
As shown in fig. 6, D-LM resume module flows include：
Step S601：D-LM modules configure correct MEG and MEP, and relevant configuration is converted into FPGA by drive module
Corresponding list item, enable the transmission of CCM frames and both-end LOF measurement function；
Step S602：D-LM modules receive drive module obtain for FPGA module fill TxFCf in quick CCM frames,
After the interrupt message of frame count statistical value corresponding to the fields such as RxFCb and TxFCb, frame count numerical value corresponding to generation, and pass through
Drive module returns to FPGA module；
Step S603：What D-LM modules received that drive module reports sends quick with the opposite end MEP that FPGA is parsed
After the interrupt message of the fields such as TxFCf, RxFCb and TxFCb in CCM frames, judge whether the interrupt message is to report for the first time,
If it is, the field contents such as TxFCf, RxFCb and TxFCb are preserved as initial statistical value, while as last system
Evaluation；Otherwise, S604 is gone to step；
Step S604：D-LM modules will preserve in the fields such as TxFCf, RxFCb and TxFCb in interrupt message and this module
Last statistical value calculate local terminal and distal end LOF according to equation below；Simultaneously by this TxFCf, RxFCb and
The field contents such as TxFCb are preserved as last statistical value；
Frame Loss (distal end)=| TxFCb [this]-TxFCb [last time] |-| RxFCb [this]-RxFCb [upper one
It is secondary] |
Frame Los (local terminal)=| TxFCf [this]-TxFCfI is last] |-| RxFCl [this]-RxFCl [upper one
It is secondary] |
In the present embodiment, any to support that Y.1731 ITU-T can be carried out between the equipment of standard high-precision based on quick
CCM frames both-end frame packet loss measurement, correctly reflect network transmission quality between current measuring node equipment, solve merely according to
Bad CPU can not realize high-acruracy survey to the both-end LOF based on quick CCM frames (it sends the cycle equal to less than 100 milliseconds)
Technical barrier.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the present invention.According to
The content of the invention of the present invention, can also there is other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, be familiar with
Those skilled in the art works as can make various corresponding changes and deformation according to the present invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (7)
1. a kind of device for measuring both-end LOF, including：
On-site programmable gate array FPGA module is used to parse the quick CCM frames sent from remote equipment and therefrom extracted
The frame count numerical value carried in TxFCf, RxFCb and TxFCb field, and it is sent to both-end LOF measurement D-LM modules；
The D-LM modules are used for using the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received,
Carry out the LOF measurement of local terminal and distal end；
Wherein, the D-LM modules are additionally operable to produce the frame count for filling TxFCf, RxFCb and TxFCb field in quick CCM frames
Numerical value, and it is sent to the FPGA module；
The FPGA module is additionally operable to the frame count numerical value for assembling quick CCM frames and sending the D-LM modules correspondingly
After being filled into TxFCf, RxFCb and TxFCb field in the quick CCM frames, the quick CCM frames are sent.
2. device as claimed in claim 1, it is characterised in that：
The D-LM modules are used for using the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received,
The LOF measurement of local terminal and distal end is carried out, is specifically included：
The absolute value that the LOF of the distal end is equal to the front and rear TxFCb received twice in succession difference connects twice in succession with front and rear
The difference of the absolute value of the RxFCb received difference；
The absolute value that the LOF of the local terminal is equal to the front and rear TxFCf received twice in succession difference connects twice in succession with front and rear
The difference of the absolute value of the RxFCl received difference.
3. device as claimed in claim 1, it is characterised in that：
The D-LM modules are additionally operable to produce the frame count numerical value for filling TxFCf, RxFCb and TxFCb field in quick CCM frames,
Specifically include：
The D-LM is used for after the solicited message that the FPGA module is sent is received, produce fill TxFCf in quick CCM frames,
The frame count numerical value of RxFCb and TxFCb fields.
4. the device as described in any one in claims 1 to 3, it is characterised in that also include：
Drive module, for transmitting frame count numerical value and configuration information between the D-LM modules and the FPGA module；Its
In, the configuration information is configuration parameter information required when the FPGA module starts.
A kind of 5. method for measuring both-end LOF, applied to including on-site programmable gate array FPGA module and both-end LOF
In the equipment for measuring D-LM modules, including：
The FPGA module parses the quick CCM frames sent from remote equipment and therefrom extracts TxFCf, RxFCb and TxFCb word
The frame count numerical value carried in section, and it is sent to the D-LM modules；
The D-LM modules are carried out using the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received
The LOF measurement of local terminal and distal end；
Wherein, the D-LM modules produce the frame count numerical value for filling TxFCf, RxFCb and TxFCb field in quick CCM frames, and
It is sent to the FPGA module；
The frame count numerical value that the FPGA module assembles quick CCM frames and sends the D-LM modules is correspondingly filled into
After TxFCf, RxFCb and TxFCb field in the quick CCM frames, the quick CCM frames are sent.
6. method as claimed in claim 5, it is characterised in that：
The D-LM modules are carried out using the frame count numerical value carried in TxFCf, RxFCb and TxFCb field received
The LOF measurement of local terminal and distal end, is specifically included：
The absolute value that the LOF of the distal end is equal to the front and rear TxFCb received twice in succession difference connects twice in succession with front and rear
The difference of the absolute value of the RxFCb received difference；
The absolute value that the LOF of the local terminal is equal to the front and rear TxFCf received twice in succession difference connects twice in succession with front and rear
The difference of the absolute value of the RxFCl received difference.
7. method as claimed in claim 5, it is characterised in that：
The D-LM modules produce the frame count numerical value for filling TxFCf, RxFCb and TxFCb field in quick CCM frames, specific bag
Include：
The D-LM is produced after the solicited message that the FPGA module is sent is received and is filled TxFCf, RxFCb in quick CCM frames
With the frame count numerical value of TxFCb fields.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110427269.4A CN103166738B (en) | 2011-12-19 | 2011-12-19 | A kind of device and method for measuring both-end LOF |
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| CN201110427269.4A CN103166738B (en) | 2011-12-19 | 2011-12-19 | A kind of device and method for measuring both-end LOF |
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| CN103166738A CN103166738A (en) | 2013-06-19 |
| CN103166738B true CN103166738B (en) | 2018-02-27 |
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