CN101616345B - Method and device for bridging ONU (optical network Unit) in EPON (Ethernet Passive optical network) - Google Patents
Method and device for bridging ONU (optical network Unit) in EPON (Ethernet Passive optical network) Download PDFInfo
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Abstract
The invention discloses a method and a device for bridging ONU in EPON network, wherein the bridging method comprises the following steps: after receiving bridging configuration for adding Optical Network Units (ONUs) in a cluster, an Optical Line Terminal (OLT) acquires a set A of the ONUs participating in bridging in the cluster and a set C of the ONUs to be added in the cluster after configuration; and the OLT calculates a bridging set ADD of the cluster according to the set A and the set C, and sequentially realizes the bridging of every two ONUs according to the bridging set ADD. The invention can process bridging configuration in batch, greatly improve processing efficiency, accurately and rapidly realize bridging management of a plurality of ONUs, and avoid the phenomenon of short interruption of normal service.
Description
Technical field
(Ethernet Passive Optical Network EPON), relates in particular to optical network unit in a kind of EPON network (Optical Network Unit, bridging method ONU) and device to the present invention relates to Ethernet passive optical network.
Background technology
The EPON technology is carried out standardization by IEEE 802.3EFM working group.In June, 2004, IEEE802.3EFM working group has issued EPON standard IEEE 802.3ah (2005 incorporate into IEEE802.3-2005 standard).In this standard with Ethernet and EPON (Passive OpticalNetwork; PON) technology combines; On the basis of EPON architectural framework; Defined a kind of physical layer specification new, that be applied to the EPON system and the ethernet data link layer agreement of expansion, inserted to be implemented in the PON that a little arrives multiple spot.
Referring to Fig. 1, be the typical networking diagram of EPON.EPON is the single fiber bi-directional Optical Access Network that multiple spot (P2MP) structure is put in a kind of employing, and its canonical topology structure is the tree type.The EPON system by the optical line terminal of office's side (Optical Line Terminal, OLT), (Optical Distribution Network ODN) forms, and is the single fiber bi-directional system for the ONU of user side and Optical Distribution Network.
At down direction (OLT is to ONU), the signal that OLT sends arrives each ONU through ODN.At up direction (ONU is to OLT), the signal that ONU sends only can arrive OLT, and can not arrive other ONU.For fear of data collision and improve network utilisation efficient, up direction adopts the time division multiple access visit, and (Time Division Multiple Access, mode TDMA) is also sent the data of each ONU and to be arbitrated.ODN is made up of Passive Optical Components such as optical fiber and one or more passive optical splitters, between OLT and ONU, optical channel is provided.
ONU is connected to through ODN on the interface of OLT, and the bridge joint of ONU is exactly that ONU in the cluster can mutual communication, is not that the ONU of same cluster can not communicate by letter, and distinguishes with ONUID (numbering of ONU) between the ONU.
Suppose that an OLT interface connects M ONU at most through ODN, M ONU is divided into Z cluster (M, Z are integer).Each cluster all comprises several ONU, comprises 4 ONU like the cluster among Fig. 20, and cluster 1 comprises 2 ONU, and cluster Z comprises 1 ONU, and cluster 2 does not comprise ONU with cluster 3.The ONU quantity summation that all clusters comprise is M.ONU in the cluster can mutual communication, but can not communicate by letter with cluster ONU outward.Cluster number is that 0 ONU cluster is special cluster, and the ONU in this cluster can not mutual communication.In an OLT interface, cluster number is unique; In an OLT equipment, (OLT ID, cluster number) this combination is unique, and wherein OLT ID is the interface index of OLT.
General EPON process chip can only two ONU of a southbridge, and the manual operation chip is very loaded down with trivial details, and very easily makes mistakes.And, in the process of carrying out bridge joint, understand the regular traffic of short interruption ONU usually, so that reconfigure the bridge joint of all ONU in the cluster, so also normal business is affected.
Summary of the invention
The technical problem that the present invention will solve is exactly bridging method and the device that proposes ONU in a kind of EPON network, and it is more loaded down with trivial details to solve in the prior art manual operation, easy error, and possibly cause the problem of the regular traffic short interruption of ONU.
In order to solve the problems of the technologies described above, the present invention provides the bridging method of ONU in a kind of EPON network, comprising:
After optical line terminal (OLT) receives the bridge configuration that increases optical network unit (ONU) in the cluster, the set C of the ONU that the set A of the ONU of said cluster participation bridge joint and said cluster are to be increased after obtaining to dispose;
Said OLT calculates the bridge joint set A DD of said cluster according to said set A and set C, wherein ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}, wherein, x is the ONU that belongs to set A, y belongs to the ONU that gathers C;
OLT realizes the bridge joint of ONU in twos successively according to bridge joint set A DD.
Further, above-mentioned bridging method also can have following characteristics:
After OLT receives the bridge configuration of ONU in the deletion cluster, obtain the set E of said cluster ONU to be deleted;
Said OLT calculates the bridge joint that goes of said cluster and gathers DEL, wherein DEL={ (a according to set B and the said set E of the ONU of said cluster participation bridge joint before disposing; B) | a ∈ B, b ∈ E, and a is not equal to b}; Wherein, a is the ONU that belongs to set B, and b belongs to the ONU that gathers E;
OLT is according to removing bridge joint set DEL, realizes the bridge joint that goes of ONU in twos successively.
Further, above-mentioned bridging method also can have following characteristics:
The bridge configuration that said OLT receives comprises: OLT ID, cluster number, the set of ONU ID, additions and deletions sign; Wherein the additions and deletions sign is used for expression increase or deletion cluster ONU.
Further, above-mentioned bridging method also can have following characteristics:
Said OLT obtains user's allocation list according to said bridge configuration and the said OLT set of all ONU compositions of connection down, comprises said set A in said user's allocation list.
Further, above-mentioned bridging method also can have following characteristics:
Said OLT is through more said user's allocation list and chip configuration table; Obtain the set E of set C and the said cluster of said cluster ONU to be increased ONU to be deleted; And, calculate the bridge joint set A DD of said cluster according to said set A and set C, and; According to said set B and set E, calculate the bridge joint that goes of said cluster and gather DEL;
Wherein, comprise said set B in the said chip configuration table.
Further, above-mentioned bridging method also can have following characteristics:
Said OLT is according to bridge joint set A DD and/or remove bridge joint set DEL, pio chip operation table;
Said OLT is according to the chip operation table, realizes the bridge joint of ONU in twos successively or removes bridge joint;
Said chip operation table comprises: ONU ID, ONU ID, additions and deletions sign; Said chip operation table is used to indicate two ONU bridge joints of corresponding ID or remove bridge joint, and wherein said additions and deletions sign is used to indicate bridge joint or removes bridge joint.
In order to solve the problems of the technologies described above, the present invention also provides the bridge-set of ONU in a kind of EPON network, and said bridge-set is arranged in OLT, comprises the user configuration module, bridging management policy module, the chip realization module that link to each other successively;
Said user configuration module is used for receiving the bridge configuration that increases cluster ONU, and the said cluster in output configuration back is participated in the set A of the ONU of bridge joint and given said bridging management policy module;
Said bridging management policy module is used for the set B that said cluster is participated in the ONU of bridge joint before the stored configuration; According to said set A and set B, obtain the set C of cluster ONU to be increased, and according to said set A and set C; Calculate the bridge joint set A DD of said cluster; And, according to said bridge joint set A DD, inform that said chip realizes that module carries out the bridge joint of ONU in twos;
Said chip realizes that module is used for realizing successively the bridge joint of ONU in twos.
Wherein, ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}, and wherein, x is the ONU that belongs to set A, and y belongs to the ONU that gathers C.
Further, above-mentioned bridge-set also can have following characteristics:
Said user configuration module is further used for receiving the bridge configuration of ONU in the deletion cluster, and the said cluster in output configuration back is participated in the set A of the ONU of bridge joint and given said bridging management policy module;
Said bridging management policy module is further used for according to said set A and set B; Obtain the set E of said cluster ONU to be deleted; And according to said set B and set E, calculate the bridge joint that goes of said cluster and gather DEL, and; According to the said bridge joint set DEL that goes, inform that said chip realizes that module carries out the bridge joint that goes of ONU in twos;
Said chip realizes that module is used for realizing successively the bridge joint that goes of ONU in twos.
Further, above-mentioned bridge-set also can have following characteristics:
Said user configuration module is further used for according to said bridge configuration and the said OLT set of all ONU compositions of connection down, and output user allocation list is given the bridging management policy module, comprises said set A in said user's allocation list.
Further, above-mentioned bridge-set also can have following characteristics:
Said bridging management policy module is further used for the storage chip allocation list, and the said chip configuration table of user's allocation list that receives and storage is compared, and obtains said set C and set E; And according to the bridge joint set A DD that calculates and/or remove bridge joint set DEL, the pio chip operation table is realized module to chip;
Said chip realizes that module is further used for according to said chip operation table, realizes the bridge joint of ONU in twos successively or removes bridge joint;
Wherein, said chip configuration table comprises said set B;
Said chip operation table comprises: ONU ID, ONU ID, additions and deletions sign; Said chip operation table is used to indicate two ONU bridge joints of corresponding ID or remove bridge joint, and wherein said additions and deletions sign is used to indicate bridge joint or removes bridge joint.
The present invention can the batch process bridge configuration, has greatly improved treatment effeciency, can realize the bridging management of a lot of ONU accurately and rapidly, the phenomenon of regular traffic short interruption can not occur.
Description of drawings
Fig. 1 is an EPON typical case networking diagram;
Fig. 2 is the cluster sketch map;
Fig. 3 is the bridge-set sketch map of the ONU of the embodiment of the invention;
Fig. 4 is the ONU ID mapping table structure chart of the embodiment of the invention;
Fig. 5 is the bridging method flow chart of the ONU of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
In the present invention, the process of bridge joint is:
After OLT receives the bridge configuration that increases ONU in the cluster, the set C of the ONU that the set A of the ONU of said cluster participation bridge joint and said cluster are to be increased after obtaining to dispose;
Said OLT calculates the bridge joint set A DD of said cluster according to said set A and set C, wherein ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}, wherein, x is the ONU that belongs to set A, y belongs to the ONU that gathers C;
OLT realizes the bridge joint of ONU in twos successively according to bridge joint set A DD.
Go the process of bridge joint to be:
After OLT receives the bridge configuration of ONU in the deletion cluster, obtain the set E of said cluster ONU to be deleted;
Said OLT calculates the bridge joint that goes of said cluster and gathers DEL, wherein DEL={ (a according to set B and the said set E of the ONU of said cluster participation bridge joint before disposing; B) | a ∈ B, b ∈ E, and a is not equal to b}; Wherein, a is the ONU that belongs to set B, and b belongs to the ONU that gathers E;
OLT is according to removing bridge joint set DEL, realizes the bridge joint that goes of ONU in twos successively.
As shown in Figure 3, the bridge-set of the ONU of the embodiment of the invention is arranged in OLT, comprises user configuration module, bridging management policy module, chip realization module;
Wherein, said user configuration module is used for receiving bridging of users configuration (comprising bridge configuration that increases cluster ONU and the bridge configuration of deleting ONU in the cluster), and output user allocation list is given the bridging management policy module; Wherein, comprise the set A that the said cluster in configuration back is participated in the ONU of bridge joint in said user's allocation list;
Store the chip configuration table in the said bridging management policy module, this chip configuration table comprises the set B that said cluster is participated in the ONU of bridge joint before the configuration, and said bridging management policy module is used to receive user's allocation list of input; The user's allocation list of said input and the chip configuration table of storage are compared,, obtain the set E of set C and the said cluster of said cluster ONU to be increased ONU to be deleted according to said set A and set B; Further; According to said set A and set C, calculate the bridge joint set A DD of said cluster, and; According to said set B and set E; That calculates said cluster removes bridge joint set DEL, according to the bridge joint set A DD that calculates with remove bridge joint set DEL, the pio chip operation table is realized module to chip;
Said chip realizes that module is used for according to the chip operation table, realizes the bridge joint of ONU in twos successively or removes bridge joint.
Particularly, user configuration module, this module be input as bridging of users configuration, the bridging of users configuration format is a four-tuple: (OLT ID, cluster number, the set of ONU ID, additions and deletions sign).This module is output as user's allocation list; The structure of user's allocation list is consistent with the structure of bridging management policy module chips allocation list; Be exactly that entry number is different; User's allocation list is concerning whole OLT equipment, and the chip configuration table is the chip under an OLT interface, so the entry number of user's allocation list is the summation of all chip configuration tables under all OLT interfaces.
User's allocation list and chip configuration table all comprise three elements at least: cluster number, OLT ID, ONUID mapping table, and ONU ID mapping table structure is referring to Fig. 4, and it is made up of the N position, (N/8) byte-sized altogether, N is 8 a multiple and more than or equal to the smallest positive integral of M.The method for expressing of ONU ID mapping table is: each representes an ONU, such as the first bit representation ONU, 1, the second bit representation ONU 2, until ONU M.If cluster number is i, OLT ID is that the m position of the ONU ID mapping table in the clauses and subclauses of j is 1 (m is the positive integer smaller or equal to M), representes that so ONU ID is that the ONU of m is that to participate in OLT ID be j cluster number for the bridge joint of the ONU cluster of i.If cluster number is i, OLT ID is that the m position of the ONU ID mapping table in the clauses and subclauses of j is 0 (m is the positive integer smaller or equal to M), representes that so ONU ID is that the ONU of m is that not participate in OLT ID be j cluster number for the bridge joint of the ONU cluster of i.
With reference to figure 5, the bridging method of the ONU of the embodiment of the invention, after the user carried out bridge configuration, user configuration module also will be judged the validity of input parameter, if directly return after the alarm of parameter ineffective demand is arranged, did not handle.
Wherein, the judgement of parameter validity can be carried out according to the characteristics of cluster, such as, an ONU can only add a cluster, if the user specifies certain ONU to add a plurality of clusters, then parameter is invalid; And, can also comprise whether the bridge configuration form of judging input is correct, whether be for the OLT ID of input, cluster number effective OLT ID, cluster number or the like.
If parameter is effective, continue to handle.
The set that all ONU that make an OLT connect down form is G, before the configuration under this OLT, this cluster the ONU of participation bridge joint set be F, the ONU that under this OLT, this cluster, does not participate in bridge joint so is F '=G-F.
The set that makes user configured ONU is H.
Judge the additions and deletions standard,, use algorithm one if additions and deletions are masked as increase (promptly increasing the bridge configuration of ONU in the cluster); If additions and deletions are masked as deletion (promptly deleting the bridge configuration of ONU in the cluster), use algorithm two.
Algorithm one:
Calculate configuration back and the set A of not participating in the ONU of bridge joint ': A=F ∪ H, A '=G-A
Algorithm two:
Set of computations A and A ': A=F-(F ∩ H), A '=G-A
After accomplishing algorithm one or algorithm two,, write the ONU ID mapping table in the access customer allocation list to A and A ', also write the access customer allocation list to OLT ID, cluster number according to the method for expressing of ONU ID mapping table.
At this moment, obtain the set A that this cluster is participated in the ONU of bridge joint.
The bridging management policy module, this module has the comparing function of user's allocation list and chip configuration table, and writes chip according to the result of comparing function.
This module be input as user's allocation list and chip configuration table, this module is output as chip configuration table and chip operation table.Wherein the pio chip allocation list is in order to compare user's allocation list and chip configuration table next time.
The comparison procedure of user's allocation list and chip configuration table is described below:
Relatively in configuration time, search for according to the combination of (OLT ID, cluster number), successively remaining last parameter ONU ID mapping table in three parameters (at every turn relatively a record) relatively.ONU ID mapping table is exactly the set of an ONU ID in fact.The ONU ID set of participating in bridge joint in the ONU ID mapping table of user's allocation list is set A, and the ONU ID set of not participating in bridge joint in the ONU ID mapping table of user's allocation list is set A '; The ONU ID set of participating in bridge joint in the ONU ID mapping table of chip configuration table is set B (i.e. the set of the ONU of said cluster participation bridge joint before the configuration), and the ONU ID set of not participating in bridge joint in the ONU ID mapping table of chip configuration table is set B '.
The each bridge joint of chip is two ONU of bridge joint, does x, y to the ID of these two ONU note.Need bridge joint several (x, y) note is made set A DD.
It is the connection of breaking off two ONU that chip removes bridge joint at every turn, does a, b to the ID of these two ONU note.Remove needs several (a, b) note do set DEL of bridge joint.
Obtain set A DD and set DEL through following method.
Order set C=A-(A ∩ B), so just obtain ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}.
Order set D=A ' ∩ B ', set E=A '-D, so just obtain DEL={ (a, b) | a ∈ B, b ∈ E, and a is not equal to b}.
If set A DD and set DEL are nonempty sets, be input to the chip operation table to set A DD and set DEL.After set A DD write the chip operation table, the additions and deletions of all clauses and subclauses were masked as increase; After set DEL write the chip operation table, the additions and deletions of all clauses and subclauses were masked as deletion.
The chip operation table is made up of three elements, and (ONU ID, ONU ID, additions and deletions sign), each these two ONU of bar record expression bridge joint perhaps breaks off the bridge joint (removing bridge joint) of these two ONU, and bridge joint still goes bridge joint to judge according to the additions and deletions sign.
At last, in the chip configuration table, replace the record in this that chip configuration table relatively to the record assignment of this user's allocation list relatively.
Chip is realized module, and this module operation chip is realized the bridging functionality of ONU.
This module be input as the chip operation table, be output as the realization of bridging functionality.
Chip is realized module, according to the order of chip operation table, calls the power function of EPON process chip, realizes the bridge joint of two ONU successively or removes bridge joint.Call at every turn the EPON process chip power function to go into ginseng be exactly a chip operation table record, i.e. three parameters: ONU ID, ONU ID, additions and deletions sign.
Need to prove:
1. cluster number is that 0 ONU cluster is special cluster, and concerning all ONU that are connected to same OLT interface, any one ONU that links same OLT interface at any one ONU and other of this cluster is bridge joint not.
2. all ONU acquiescence is all in cluster number is 0 ONU cluster.
3. an ONU can only add a cluster.
4. if an ONU belongs to certain cluster, need to add another cluster, at first to from original cluster, delete, cluster number is except 0 the ONU cluster.
Among the present invention, cluster number is not 0 in the bridge configuration of user input.When the bridging management policy module is exported to the chip operation table chip and realized module, also delete the ONU among the set C of ONU to be increased in the cluster 0, and, the set E of ONU to be deleted in cluster 0, increased.
In sum, the present invention can add in batches from the cluster of ONU or delete ONU, realizes bridge joint in the cluster, the function that the ONU between the different clusters can not communicate by letter.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the bridging method of ONU in the EPON network comprises:
After optical line terminal OLT receives the bridge configuration that increases optical network unit ONU in the cluster, the set C of the ONU that the set A of the ONU of said cluster participation bridge joint and said cluster are to be increased after obtaining to dispose;
Said OLT calculates the bridge joint set A DD of said cluster according to said set A and set C, wherein ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}, wherein, x is the ONU that belongs to set A, y belongs to the ONU that gathers C;
OLT realizes the bridge joint of ONU in twos successively according to bridge joint set A DD.
2. bridging method as claimed in claim 1 is characterized in that,
After OLT receives the bridge configuration of ONU in the deletion cluster, obtain the set E of said cluster ONU to be deleted;
Said OLT calculates the bridge joint that goes of said cluster and gathers DEL, wherein DEL={ (a according to set B and the said set E of the ONU of said cluster participation bridge joint before disposing; B) | a ∈ B, b ∈ E, and a is not equal to b}; Wherein, a is the ONU that belongs to set B, and b belongs to the ONU that gathers E;
OLT is according to removing bridge joint set DEL, realizes the bridge joint that goes of ONU in twos successively.
3. bridging method as claimed in claim 2 is characterized in that,
The bridge configuration that said OLT receives comprises: OLT ID, cluster number, the set of ONU ID, additions and deletions sign; Wherein the additions and deletions sign is used for expression increase or deletion cluster ONU.
4. like claim 2 or 3 described bridging methods, it is characterized in that,
Said OLT obtains user's allocation list according to said bridge configuration and the said OLT set of all ONU compositions of connection down, comprises said set A in said user's allocation list.
5. bridging method as claimed in claim 4 is characterized in that,
Said OLT is through more said user's allocation list and chip configuration table; Obtain the set E of set C and the said cluster of said cluster ONU to be increased ONU to be deleted; And, calculate the bridge joint set A DD of said cluster according to said set A and set C, and; According to said set B and set E, calculate the bridge joint that goes of said cluster and gather DEL;
Wherein, comprise said set B in the said chip configuration table.
6. bridging method as claimed in claim 5 is characterized in that,
Said OLT is according to bridge joint set A DD and/or remove bridge joint set DEL, pio chip operation table;
Said OLT is according to the chip operation table, realizes the bridge joint of ONU in twos successively or removes bridge joint;
Said chip operation table comprises: ONU ID 1, ONU ID 2, additions and deletions sign; Said chip operation table is used to indicate two ONU bridge joints of corresponding ID or remove bridge joint, and wherein said additions and deletions sign is used to indicate bridge joint or removes bridge joint.
7. the bridge-set of ONU in the EPON network is characterized in that said bridge-set is arranged in OLT, comprises that the user configuration module, bridging management policy module, the chip that link to each other successively realize module;
Said user configuration module is used for receiving the bridge configuration that increases cluster ONU, and the said cluster in output configuration back is participated in the set A of the ONU of bridge joint and given said bridging management policy module;
Said bridging management policy module is used for the set B that said cluster is participated in the ONU of bridge joint before the stored configuration; According to said set A and set B, obtain the set C of cluster ONU to be increased, and according to said set A and set C; Calculate the bridge joint set A DD of said cluster; And, according to said bridge joint set A DD, inform that said chip realizes that module carries out the bridge joint of ONU in twos;
Said chip realizes that module is used for realizing successively the bridge joint of ONU in twos.
Wherein, ADD={ (x, y) | x ∈ A, y ∈ C, and x is not equal to y}, and wherein, x is the ONU that belongs to set A, and y belongs to the ONU that gathers C.
8. bridge-set as claimed in claim 7 is characterized in that,
Said user configuration module is further used for receiving the bridge configuration of ONU in the deletion cluster, and the said cluster in output configuration back is participated in the set A of the ONU of bridge joint and given said bridging management policy module;
Said bridging management policy module is further used for according to said set A and set B; Obtain the set E of said cluster ONU to be deleted; And according to said set B and set E, calculate the bridge joint that goes of said cluster and gather DEL, and; According to the said bridge joint set DEL that goes, inform that said chip realizes that module carries out the bridge joint that goes of ONU in twos;
Said chip realizes that module is used for realizing successively the bridge joint that goes of ONU in twos.
9. bridge-set as claimed in claim 8 is characterized in that,
Said user configuration module is further used for according to said bridge configuration and the said OLT set of all ONU compositions of connection down, and output user allocation list is given the bridging management policy module, comprises said set A in said user's allocation list.
10. bridge-set as claimed in claim 9 is characterized in that,
Said bridging management policy module is further used for the storage chip allocation list, and the said chip configuration table of user's allocation list that receives and storage is compared, and obtains said set C and set E; And according to the bridge joint set A DD that calculates and/or remove bridge joint set DEL, the pio chip operation table is realized module to chip;
Said chip realizes that module is further used for according to said chip operation table, realizes the bridge joint of ONU in twos successively or removes bridge joint;
Wherein, said chip configuration table comprises said set B;
Said chip operation table comprises: ONU ID 1, ONU ID 2, additions and deletions sign; Said chip operation table is used to indicate two ONU bridge joints of corresponding ID or remove bridge joint, and wherein said additions and deletions sign is used to indicate bridge joint or removes bridge joint.
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|---|---|---|---|---|
| CN101355387A (en) * | 2007-07-26 | 2009-01-28 | 华为技术有限公司 | Method, equipment and system for optical network unit to access network |
| CN101267681A (en) * | 2008-04-23 | 2008-09-17 | 中兴通讯股份有限公司 | An access device and multicast control method for passive optical network |
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| CN101616345A (en) | 2009-12-30 |
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