CN101674218B - Method and device for intercommunicating optical transport networks - Google Patents
Method and device for intercommunicating optical transport networks Download PDFInfo
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- CN101674218B CN101674218B CN200810212292XA CN200810212292A CN101674218B CN 101674218 B CN101674218 B CN 101674218B CN 200810212292X A CN200810212292X A CN 200810212292XA CN 200810212292 A CN200810212292 A CN 200810212292A CN 101674218 B CN101674218 B CN 101674218B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
Abstract
The embodiment of the invention discloses a method and a device for intercommunicating optical transport networks and belongs to the optical network field. The method comprises the following steps of: from a first OTN to a second OTN, receiving, buffering and storing a data frame stream from the first OTN, updating the stored first data byte statistical information, inserting a first idle frame in the data frame stream of the first OTN according to a preset frequency ratio when the first data byte statistical information is less than or equal to a preset first threshold value, and sending the data frame stream inserted into the first idle frame; and from the second OTN to the first OTN, receiving, buffering and storing a data frame stream from the second OTN, deleting the second idle frame when the data frame from the second OTN is a second idle frame, wherein the first OTN is an optical transport network with a ranked ODUk speed, the second first OTN is an optical transport network with a ranked ODUkh speed and h is a positive integer. The device comprises a first adaption module and a second adaption module. The method and the device of the invention can realize the intercommunication of signal data of the same ranked optical transport networks.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method and apparatus of intercommunicating optical transport networks.
Background technology
Optical transport network OTN (Optical Transport Network) is that a kind of light that ITU-T formulates transmits standard.It mainly is made up of the encapsulation of optical channel Payload Unit OPUk (Optical Channel Payload Unit), optical channel data cell ODUk (Optical Channel Data Unit) and optical channel delivery unit OTUk different aspects such as (Optical Channel Transport Unit); K=1,2 or 3 wherein; Represent different speed grade; OTN unified interface signal data frame structure is as shown in Figure 1, and the possible speed of OxUkh and OxUk concerns as shown in table 1:
Table 1
At present, operator is carrying out the client signal bearer path signal of optical transport network OTN of future generation and the standard formulation work of interface signal speed grade.Operator hopes that not only the optical transfer network of same rate grade realizes intercommunication on business, also hopes to realize the intercommunication of Operations,Administration And Maintenance OAM (Operations Administration and Maintenance) etc.For realize ad eundem speed optical transfer network signal data intercommunication, prior art provides following scheme:
As shown in Figure 2; In the signal data frame, insert the rate adapted that byte of padding carries out signal data, obviously, ODUkh has identical frame structure with ODUk; And the speed of ODUkh with carry bandwidth and be higher than ODUk, then the frame repetition frequency of ODUkh is greater than the frame repetition frequency of ODUk.The byte of padding that in the signal data frame of ODUkh, inserts has consumed the bandwidth that ODUkh is relative and ODUk exceeds, and has realized the rate-matched of ODUkh and ODUk.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem:
Existing techniques in realizing the rate-matched of ODUkh and ODUk; But can only support the intercommunication of client signal; Need client signal be taken out reduction; And carry out mapping encapsulation again, so complicated operation, and can not support Operations,Administration And Maintenance OAM, forward error correction FEC (Forward Error Correction), professional flexible dispatching and the managerial intercommunication of ODUk or OTUk aspect.
Summary of the invention
In order to realize the intercommunication of optical transfer network, the embodiment of the invention provides a kind of method and apparatus of intercommunicating optical transport networks.Said technical scheme is following:
A kind of method of intercommunicating optical transport networks, said method comprises:
From the first optical transport network OTN to the, two OTN,
Reception and buffer-stored are from the data frame stream of a said OTN, and the first data byte statistical information of updated stored is when the said first data byte statistical information is less than or equal to preset first threshold; According to the predeterminated frequency ratio, in the data frame stream of a said OTN, insert first idle frame, and send the data frame stream of inserting said first idle frame; Said frequency preset ratio is Fi: Fo, wherein, and Fi=Fh-Fo; Wherein, Fi is the number of first idle frame, and Fo is an optical channel data cell ODUk Frame number; Fh is an ODUkh Frame number; K is a positive integer, represents different speed grade, and the frame repetition frequency of said ODUkh is greater than the frame repetition frequency of said ODUk;
From the 2nd OTN to the OTN,
Reception and buffer-stored when the Frame from said the 2nd OTN is second idle frame, are deleted said second idle frame from the data frame stream of said the 2nd OTN;
Wherein, a said OTN is the optical transfer network of ODUk speed grade, and said the 2nd OTN is the optical transfer network of ODUkh speed grade.
A kind of device of intercommunicating optical transport networks comprises: first adaptation module and second adaptation module;
Said first adaptation module, be used to receive and buffer-stored from the data frame stream of a said OTN, the first data byte statistical information of updated stored is when the said first data byte statistical information is less than or equal to preset first threshold; According to the predeterminated frequency ratio, in the data frame stream of an OTN, insert first idle frame, said frequency preset is than being Fi: Fo; Wherein, Fi=Fh-Fo, wherein; Fi is the number of first idle frame, and Fo is an optical channel data cell ODUk Frame number, and Fh is an ODUkh Frame number; K is a positive integer, represents different speed grade, and the frame repetition frequency of said ODUkh is greater than the frame repetition frequency of said ODUk;
Said second adaptation module, be used to receive and buffer-stored from the data frame stream of said the 2nd OTN, when the Frame from said the 2nd OTN is second idle frame, delete said second idle frame;
Wherein, a said OTN is the optical transfer network of ODUk speed grade, and said the 2nd OTN is the optical transfer network of ODUkh speed grade.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
Through low OTN sends to insertion first idle frame the high OTN process of speed from speed at Frame according to the predeterminated frequency ratio; And at Frame high OTN sends to second idle frame in the deleted data frame the low OTN process of speed from speed; Can avoid inserting in the prior art problem of the complicated operation that byte of padding brought; Realize the intercommunication of the signal data of ad eundem speed optical transfer network; Comprise OAM, FEC, professional flexible dispatching and managerial intercommunication, solved in the high OTN of speed and send from the client signal bearer path signal of the low ONT of speed and the problem of interface signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the OTN unified interface signal data frame assumption diagram that prior art provides;
Fig. 2 is the sketch map that in Frame, inserts byte of padding realization intercommunicating optical transport networks that prior art provides;
Fig. 3 is the method flow diagram from an OTN to the two OTN realization intercommunication that the embodiment of the invention 1 provides;
Fig. 4 is that the embodiment of the invention 1 provides a kind of sketch map that inserts the ODUkh data frame stream behind the idle frame;
Fig. 5 is the sketch map that the another kind that provides of the embodiment of the invention 1 inserts the OTUkh data frame stream behind the idle frame;
Fig. 6 is the method flow diagram from the 2nd OTN to the OTN realization intercommunication that the embodiment of the invention 1 provides;
Fig. 7 is the structure drawing of device of a kind of intercommunicating optical transport networks of providing of the embodiment of the invention 2;
Fig. 8 is the structure drawing of device of the another kind of intercommunicating optical transport networks that provides of the embodiment of the invention 2.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of method of intercommunicating optical transport networks, is applied to exist the scene of an OTN and the 2nd OTN, wherein; The one OTN is the optical transfer network of ODUk speed grade; The 2nd OTN is the optical transfer network of ODUkh speed grade, and k is a positive integer, and this method comprises:
From an OTN to the two OTN,
Reception and buffer-stored are from the data frame stream of an OTN; The first data byte statistical information of updated stored; When the first data byte statistical information is less than or equal to preset first threshold; According to the predeterminated frequency ratio, in the data frame stream of sending, insert first idle frame to said the 2nd OTN;
From the 2nd OTN to the OTN,
Reception and buffer-stored when the Frame from the 2nd OTN is second idle frame, are deleted second idle frame from the data frame stream of the 2nd OTN;
Wherein, frequency preset is than for Fi: Fo, wherein, Fi=Fh-Fo, wherein, Fi is the number of first idle frame, and Fo is an ODUk Frame number, and Fh is an ODUkh Frame number, or Fo is OTUk Frame number, and Fh is an OTUkh Frame number.
The purpose of inserting idle frame is: consume the more than needed bandwidth resources of ODUkh optical transfer network with respect to the signal of the optical transfer network of the ODUk of ad eundem.
Further, this method also comprises:
When the first data byte statistical information during, send Frame to the 2nd ONT by frame greater than preset first threshold.
Further, this method also comprises:
When the Frame from said the 2nd OTN is not idle frame, carry out storage, and the second data byte statistical information of updated stored; When the second data byte statistical information during, send Frame to an ONT by frame greater than the preset second threshold value.
Further, this method also comprises:
The memory that resets, enable data receives storage.
Be described in detail in the face of present embodiment down, an OTN is an example with the OTN of ODU1 speed grade, and the 2nd OTN is an example with the OTN of ODU1h speed grade.
Direction from the OTN of ODU1 speed grade to the OTN of ODU1h speed grade, as shown in Figure 3, this method comprises:
101: receive data frame stream from the OTN of ODU1 speed grade.
102: the data frame stream that buffer-stored receives, and the first data byte statistical information of updated stored.
103: when the first data byte statistical information is less than or equal to preset first threshold,, in the data frame stream that the OTN to the ODU1h speed grade sends, insert first idle frame according to the predeterminated frequency ratio.
Wherein, the insertion frequency ratio of first idle frame is Fi: Fo, wherein, and Fi=Fh-Fo; Wherein, Fi is the number of first idle frame, and Fo is the number of ODU1 Frame; Fh is the number of ODU1h Frame, or Fo is the number of OTU1 Frame, and Fh is the number of OTU1h Frame.That is to say, need to insert an idle frame behind average (Fo/Fi) ODU1 Frame, (Fo/Fi) be not necessarily integer.The mark of idle frame adopts the overhead field in the ODU1h expense to carry out mark, for example, adopts complete " 10101010 " mark of RES byte.
Intercommunication to the frame data structure of ODU1 and ODU1h; When OTU1h was taken as 255/227 to the rate factor of STM-16, ODU1h was 238: 227 with the ratio of the speed of ODU1, at this moment; 227 ODU1 Frames add that 11 idle frames of insertion just can mate the 238ODU1h Frame; This moment is (Fo/Fi)=20.636363 on average ..., promptly per 20 or 21 ODU1 Frames insert an idle frame, and the ODU1h Frame behind the insertion idle frame is as shown in Figure 4.
Intercommunication to the frame data structure of OTU1 and OTU1h; When OTU1h is taken as 243/217 to the rate factor of STM-16; OTU1h is 2754: 2635 with the ratio of the speed of OTU1, and at this moment, 2635 OTU1 Frames add that 119 idle frames of insertion just can mate the array frame of 2754 OTU1h; This moment is (Fo/Fi)=23.142857142857 on average ..., promptly per 23 or 24 OTU1 Frames insert an idle frame.The sketch map of the OTU1h Frame behind the insertion idle frame is as shown in Figure 5.
Further, this method also comprises:
When the first data byte statistical information during greater than preset first threshold, send Frame by frame to the OTN of ODU1h speed grade, and the first data byte statistical information of updated stored.
Further, this method also comprises:
The memory that resets, data quantity stored is designated as 0 byte, and enable data receives storage.
Direction from the OTN of ODU1h speed grade to the OTN of ODU1 speed grade, as shown in Figure 6, this method comprises:
201: receive data frame stream from the OTN of ODU1h speed grade.
202: buffer-stored is from the data frame stream of the OTN of ODU1h speed grade.
203: whether the Frame of detection of stored is second idle frame, if delete second idle frame.
Further, this method also comprises:
When the Frame of detection of stored is not second idle frame, carry out the storage of data, and the second data byte statistical information of updated stored.
When the second data byte statistical information during, send Frame to the OTN of ODU1 speed grade according to the speed of the OTN of ODU1 speed grade greater than the preset second threshold value.
Further, this method also comprises:
The memory that resets, data quantity stored is designated as 0 byte, and enable data receives storage.
The intercommunication principle of the principle of the optical transfer network of ODU2h grade and the intercommunication of the optical transfer network of ODU2 grade and the optical transfer network of ODU3h grade and the optical transfer network of ODU3 grade is identical with the principle of the intercommunication of the optical transfer network of the optical transfer network of ODU1h grade and ODU1 grade, repeats no more.
The embodiment of the invention is through low OTN sends to insertion first idle frame the high OTN process of speed from speed at Frame according to the predeterminated frequency ratio; And at Frame high OTN sends to second idle frame in the deleted data frame the low OTN process of speed from speed; Can avoid inserting in the prior art problem of the complicated operation that byte of padding brought; Realize the intercommunication of the signal data of ad eundem speed optical transfer network; Comprise OAM, FEC, professional flexible dispatching and managerial intercommunication, solved in the high OTN of speed and send from the client signal bearer path signal of the low ONT of speed and the problem of interface signal.
The embodiment of the invention provides a kind of device of intercommunicating optical transport networks, is applied to an OTN and the simultaneous scene of the 2nd OTN, and wherein, an OTN is the optical transfer network of ODUk speed grade, and the 2nd OTN is the optical transfer network of ODUkh speed grade, and k is a positive integer.As shown in Figure 7, comprising: first adaptation module and second adaptation module;
First adaptation module; Be used to receive and buffer-stored from the data frame stream of an OTN; The first data byte statistical information of updated stored; When the first data byte statistical information is less than or equal to preset first threshold,, in the data frame stream that sends to the 2nd OTN, insert first idle frame according to the predeterminated frequency ratio;
Second adaptation module, be used to receive and buffer-stored from the data frame stream of the 2nd OTN, when the Frame from the 2nd OTN is second idle frame, delete second idle frame;
Wherein, frequency preset is than for Fi: Fo, wherein, Fi=Fh-Fo, wherein, Fi is the number of first idle frame, and Fo is an ODUk Frame number, and Fh is an ODUkh Frame number, or Fo is OTUk Frame number, and Fh is an OTUkh Frame number.
The purpose of inserting idle frame is: consume the more than needed bandwidth resources of ODUkh optical transfer network with respect to the signal of the optical transfer network of the ODUk of ad eundem.
Wherein, first adaptation module comprises: first receiver module, first memory module, first control module and first sending module;
First receiver module is used to receive the data frame stream from a said OTN;
First memory module is used for the data frame stream that buffer-stored first receiver module receives, and upgrades the first data byte statistical information, and the first data byte statistical information is sent to first control module;
First control module; Be used to receive the first data byte statistical information; When the first data byte statistical information during smaller or equal to preset first threshold, notify first sending module according to the predeterminated frequency ratio, in the data frame stream that sends to the 2nd OTN, insert first idle frame;
First sending module is used for notice according to first control module according to the predeterminated frequency ratio, in the data frame stream that sends to the 2nd OTN, inserts first idle frame.
Further, first control module also is used for notifying first sending module to send Frame by frame to the 2nd OTN when the first data byte statistical information during greater than preset first threshold;
First sending module also is used for the notice according to first control module, sends Frame by frame to the 2nd OTN.
Wherein, second adaptation module comprises:
Second receiver module, second memory module, second control module and removing module;
Second receiver module is used to receive the data frame stream from the 2nd OTN;
Second memory module is used for the data frame stream of buffer-stored from the 2nd OTN;
Second control module, whether the Frame that is used for detection of stored is second idle frame, if the notice removing module is deleted second idle frame;
Removing module is used for deleting second idle frame according to the notice of second control module.
Further, as shown in Figure 8, second adaptation module also comprises: second sending module;
When the Frame that second control module also is used for detection of stored is not idle frame, the second data byte statistical information of updated stored; When the second data byte statistical information during, notify second sending module after the second memory module read data frame, to send to an OTN greater than the preset second threshold value;
Second sending module is used for the notice according to second control module, after the second memory module read data frame, sends to the-OTN.
Further, this device also comprises:
Reseting module is used to the memory that resets, and enable data receives storage.
The device that the embodiment of the invention provides passes through according to the predeterminated frequency ratio; Low OTN sends to insertion first idle frame the high OTN process of speed from speed at Frame; And at Frame high OTN sends to second idle frame in the deleted data frame the low OTN process of speed from speed; Can avoid inserting in the prior art problem of the complicated operation that byte of padding brought; The intercommunication of the signal data of realization ad eundem speed optical transfer network comprises OAM, FEC, professional flexible dispatching and managerial intercommunication, has solved in the high OTN of speed to send from the client signal bearer path signal of the low ONT of speed and the problem of interface signal.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to accomplish through program; Said program can be stored in the computer read/write memory medium, and said storage medium is floppy disk, hard disk or the CD etc. of computer.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for an intercommunicating optical transport networks is characterized in that, said method comprises:
From the first optical transport network OTN to the, two OTN,
Reception and buffer-stored are from the data frame stream of a said OTN, and the first data byte statistical information of updated stored is when the said first data byte statistical information is less than or equal to preset first threshold; According to the predeterminated frequency ratio, in the data frame stream of a said OTN, insert first idle frame, and send the data frame stream of inserting said first idle frame; Said frequency preset ratio is Fi: Fo, wherein, and Fi=Fh-Fo; Wherein, Fi is the number of first idle frame, and Fo is an optical channel data cell ODUk Frame number; Fh is an ODUkh Frame number; K is a positive integer, represents different speed grade, and the frame repetition frequency of said ODUkh is greater than the frame repetition frequency of said ODUk;
From the 2nd OTN to the OTN,
Reception and buffer-stored when the Frame from said the 2nd OTN is second idle frame, are deleted said second idle frame from the data frame stream of said the 2nd OTN;
Wherein, a said OTN is the optical transfer network of ODUk speed grade, and said the 2nd OTN is the optical transfer network of ODUkh speed grade.
2. the method for optical transport network intercommunication as claimed in claim 1 is characterized in that, when the said first data byte statistical information during greater than said preset first threshold, sends Frame by frame to said the 2nd OTN.
3. the method for optical transport network intercommunication as claimed in claim 1 is characterized in that,
When the Frame from said the 2nd OTN is not idle frame, carry out storage, and the second data byte statistical information of updated stored;
When the said second data byte statistical information during, send Frame to a said OTN by frame greater than the preset second threshold value.
4. the method for optical transport network intercommunication as claimed in claim 1 is characterized in that, said reception and buffer-stored are from also comprising before the data frame stream of a said OTN or before said reception and the data frame stream of buffer-stored from said the 2nd OTN:
The memory that resets, enable data receives storage.
5. the device of an intercommunicating optical transport networks is characterized in that, comprising: first adaptation module and second adaptation module;
Said first adaptation module, be used to receive and buffer-stored from the data frame stream of the said first optical transport network OTN, the first data byte statistical information of updated stored; When the said first data byte statistical information is less than or equal to preset first threshold,, in the data frame stream of a said OTN, insert first idle frame according to the predeterminated frequency ratio; Said frequency preset ratio is Fi: Fo, wherein, and Fi=Fh-Fo; Wherein, Fi is the number of first idle frame, and Fo is an optical channel data cell ODUk Frame number; Fh is an ODUkh Frame number; K is a positive integer, represents different speed grade, and the frame repetition frequency of said ODUkh is greater than the frame repetition frequency of said ODUk;
Said second adaptation module, be used to receive and buffer-stored from the data frame stream of said the 2nd OTN, when the Frame from said the 2nd OTN is second idle frame, delete said second idle frame;
Wherein, a said OTN is the optical transfer network of ODUk speed grade, and said the 2nd OTN is the optical transfer network of ODUkh speed grade.
6. the device of intercommunicating optical transport networks as claimed in claim 5 is characterized in that, said first adaptation module comprises:
First receiver module, first memory module, first control module and first sending module;
Said first receiver module is used to receive the data frame stream from a said OTN;
Said first memory module is used for the data frame stream that said first receiver module of buffer-stored receives, and upgrades the said first data byte statistical information, and the said first data byte statistical information is sent to said first control module;
Said first control module; Be used to receive the said first data byte statistical information; When the said first data byte statistical information is less than or equal to preset first threshold; Notify said first sending module according to the predeterminated frequency ratio, in the data frame stream of a said OTN, insert said first idle frame;
Said first sending module is used for notice according to said first control module according to the predeterminated frequency ratio, in the data frame stream of a said OTN, inserts said first idle frame.
7. the device of intercommunicating optical transport networks as claimed in claim 6; It is characterized in that; Said first control module also is used for notifying said first sending module to send Frame by frame to said the 2nd OTN when the said first data byte statistical information during greater than preset first threshold;
Said first sending module also is used for the notice according to said first control module, sends Frame by frame to said the 2nd OTN.
8. the device of intercommunicating optical transport networks as claimed in claim 5 is characterized in that, said second adaptation module comprises:
Second receiver module, second memory module, second control module and removing module;
Said second receiver module is used to receive the data frame stream from said the 2nd OTN;
Said second memory module is used for the data frame stream of buffer-stored from said the 2nd OTN;
Said second control module, whether the Frame that is used for detection of stored is second idle frame, if notify said removing module to delete said second idle frame;
Said removing module is used to delete said second idle frame.
9. the device of intercommunicating optical transport networks as claimed in claim 8 is characterized in that, said second adaptation module also comprises second sending module;
When the Frame that said second control module also is used for detection of stored is not idle frame, the second data byte statistical information of updated stored; When the said second data byte statistical information during, notify said second sending module after the said second memory module read data frame, to send to a said OTN greater than the preset second threshold value;
Said second sending module is used for the notice according to said second control module, after the said second memory module read data frame, sends to a said OTN.
10. like the device of any described intercommunicating optical transport networks of claim of claim 5-9, it is characterized in that said device also comprises:
Reseting module is used to the memory that resets, and enable data receives storage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810212292XA CN101674218B (en) | 2008-09-09 | 2008-09-09 | Method and device for intercommunicating optical transport networks |
| PCT/CN2009/072577 WO2010028554A1 (en) | 2008-09-09 | 2009-07-01 | Method and device for optical transport network intercommunication |
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| CN200810212292XA CN101674218B (en) | 2008-09-09 | 2008-09-09 | Method and device for intercommunicating optical transport networks |
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| CN101674218B true CN101674218B (en) | 2012-07-25 |
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| CN107925635A (en) * | 2015-09-24 | 2018-04-17 | 华为技术有限公司 | A kind of method for sending and receiving optical transfer network OTN signals, OTN equipment and system |
| CN106571890A (en) * | 2015-10-12 | 2017-04-19 | 深圳市中兴微电子技术有限公司 | Rate adaptation method and device |
| CN107086968B (en) * | 2016-02-14 | 2022-04-08 | 中兴通讯股份有限公司 | Service scheduling processing method and device |
| CN108123813B (en) * | 2016-11-28 | 2020-06-02 | 华为技术有限公司 | Transmission method and device for operation, administration and maintenance OAM data |
| CN109951748B (en) * | 2017-12-21 | 2020-11-27 | 中国移动通信集团公司 | SDN-based service over-sending method and system in OTN |
Citations (3)
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|---|---|---|---|---|
| EP1499048A2 (en) * | 2003-07-14 | 2005-01-19 | Anritsu Corporation | OTU frame generating apparatus and method |
| CN1617469A (en) * | 2003-11-15 | 2005-05-18 | 华为技术有限公司 | Method for realizing different speed PDH service intercommunication in synchrounic optical network |
| CN1791278A (en) * | 2004-12-14 | 2006-06-21 | 华为技术有限公司 | Synchronous optical network and optical transmission network uniform dispatching system and its method |
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| US8059685B2 (en) * | 2006-12-26 | 2011-11-15 | Ciena Corporation | Methods and systems for carrying synchronization over Ethernet and optical transport network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1499048A2 (en) * | 2003-07-14 | 2005-01-19 | Anritsu Corporation | OTU frame generating apparatus and method |
| CN1617469A (en) * | 2003-11-15 | 2005-05-18 | 华为技术有限公司 | Method for realizing different speed PDH service intercommunication in synchrounic optical network |
| CN1791278A (en) * | 2004-12-14 | 2006-06-21 | 华为技术有限公司 | Synchronous optical network and optical transmission network uniform dispatching system and its method |
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| CN101674218A (en) | 2010-03-17 |
| WO2010028554A1 (en) | 2010-03-18 |
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