CN101436952B - Method for automatically configuring pressing table and network node equipment - Google Patents
Method for automatically configuring pressing table and network node equipment Download PDFInfo
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- CN101436952B CN101436952B CN2007100313858A CN200710031385A CN101436952B CN 101436952 B CN101436952 B CN 101436952B CN 2007100313858 A CN2007100313858 A CN 2007100313858A CN 200710031385 A CN200710031385 A CN 200710031385A CN 101436952 B CN101436952 B CN 101436952B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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Abstract
The invention discloses a method for automatically configuring a compression table. The method comprises the following steps: a first node transmits a first message to a second node, wherein the message carries identification information of the first node or identification information of the first node and the second node; an intermediate node of the first message is received to extract the identification information carried by the first message, the identification information is recorded into the self compression table, and the first message is forwarded to the next node; and after the second node receives the first message, the identification information of the first node is extracted, and the identification information of the first node is recorded into the compression table of the second node. Correspondingly, the invention also discloses network node equipment. According to the method and the equipment, the compression table can be automatically configured, thereby improving work efficiency.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of method and apparatus for network node of automatic configuring pressing table.
Background technology
In network service, the major criterion of weighing a network quality is exactly reliability, robustness and the self-healing ability of this network.Self-healing ability be exactly the network equipment or link when breaking down, system can in time find fault and switch to alternate device or alternative route on, business can in time be recovered, do not influence carrying out of user's regular traffic.
At present SDH (Synchronous Digital Hierarchy; SDH (Synchronous Digital Hierarchy)) in the looped network; usually adopt Multiplex Section Shared Protection Ring (Multiplex Section shared protection rings; MS-SRRING) protect; and at T-MPLS (Transport Multi-protocol Lable Switch; the transmission multiprotocol label switching) (T-MPLS SharedProtection Ring, TM-SPRING) technology is protected to adopt the T-MPLS protection rings in the looped network.SDH looped network as shown in Figure 1, it adopts the MS-SPRING technology to protect, and promptly operating circuit Q and R adopt same protective circuit to protect.When node A breaks down; as shown in Figure 2; circuit Q will switch in the protective circuit at the Node B place; and back transfer is to node F; node F switches to operating circuit to protective circuit again, is R because node F goes up operating circuit, so just switch on the R; so just taken place wrongly, this should be avoided in the link self-healed protection.
For fear of the generation of mistake connection, in MS-SPRING, introduced the pressing table technology, described pressing table is the relevant information of node in connection or the circuit process network, connects or circuit for each bar, pressing table has all write down its Ingress node and Egress node.There are a pressing table in node A, B, C for circuit Q shown in Figure 1, have write down the Ingress node and the Egress node sign (Node ID) of circuit Q experience on ring, and wherein, Node ID is the node number that the network manager distributes.When network failure; the node of malfunctioning node adjacent both ends sends fault notification message; other node is according to fault notification message and ring upper topology information failure judgement position on the ring; as shown in Figure 2; judging node A breaks down; then Node B will be searched pressing table; find that the going into of circuit Q/egress is A; think that then circuit Q can not protect; promptly can not protect and switch; only go into AU-AIS (Administrative Unit Alarm IndicationSignal, Administration unit alarm indication signal) at the protection channel interpolation.
The pressing table technology can also be saved the network bandwidth except can preventing wrong connection.As ITU-T G.8132 draft standard in the TM-SPRING technology, introduce the pressing table technology; when network failure; whether the failure judgement node is going into/egress of work connection; if for going into of connecting of work/egress then do not protect and switch; just can not take the bandwidth that protection connects; as shown in Figure 3, a pressing table about work connection Q is arranged all on the node 2,1,8,7, it has write down the outlet/Ingress node that connects Q.After node 7 breaks down, protection can not be finished, and protection switching point 8 is according to fault notification message and encircle topology information failure judgement position at node 7; search pressing table then; find that node 7 is to connect the Q egress, will not protect and switch, thereby not take the network bandwidth.
In the present share protect loop technique; adopt the mode of webmaster personnel configuration to obtain pressing table; promptly after the intact business information of each node configuration, also need the Ingress node of configuration service and the Node ID of Egress node on node, and described configuration is finished manually by operating personnel.The inventor finds in realizing process of the present invention, in MS-SPRING, can only there be 16 link points at most, human configuration is an acceptable under the less situation of operating circuit, but maximum node numbers can be 255 on the ring in TM-SPRING, when the work connection is many, set up pressing table by human configuration, workload is quite big, inefficiency.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of method and apparatus for network node of automatic configuring pressing table, and network node can obtain Ingress node (source node) and Egress node (destination node) information automatically, automatically configuring pressing table.
Therefore, the embodiment of the invention has proposed a kind of method of automatic configuring pressing table, and it comprises:
First node sends first message to Section Point, and described message carries the identity information of first node or the identity information of first node and Section Point;
The intermediate node that receives described first message extracts the identity information that described first message is carried, and described identity information is recorded in the pressing table of self, and with described first forwards to next node;
After described Section Point receives described first message, extract the identity information of described first node, and the identity information of described first node is recorded in the pressing table of described Section Point
Correspondingly, the embodiment of the invention also provides a kind of apparatus for network node, and it comprises:
The message sink unit is used to receive the message that other node sends;
Information acquisition unit is used for obtaining from the message that described message sink unit receives the identity information of described node;
The pressing table memory cell is used to store pressing table;
Dispensing unit, the identity information that is used for node that information acquisition unit is obtained records the pressing table of pressing table memory cell.
The method and the apparatus for network node of a kind of configuring pressing table that proposes according to the embodiment of the invention, by with the first node (that is: Ingress node or Egress node) at network two ends or/and the identity information (comprising: the network address of node and node identification) of Section Point (that is: Egress node or Ingress node) be carried in the message that first node sends to Section Point, middle all nodes of transmitting this message obtain the identity information of described first node and the identity information of Section Point from this message, and record in the pressing table, reach automatic configuring pressing table purpose, reduce the workload of operating personnel's configuring pressing tables like this, improved operating efficiency.
Description of drawings
Fig. 1 is the topological structure schematic diagram of the SDH ring of a kind of MS-SPRING of employing technology in the prior art;
Fig. 2 is that node A breaks down and switches schematic diagram in the described SDH of Fig. 1 ring;
Fig. 3 is the topological structure schematic diagram of the SDH ring of a kind of TM-SPRING of employing technology in the prior art;
Fig. 4 is the structural representation of a kind of apparatus for network node of the embodiment of the invention;
Fig. 5 is the flow chart of method of a kind of automatic configuring pressing table of the embodiment of the invention;
Fig. 6 is the flow chart of first embodiment of the method for a kind of automatic configuring pressing table of the present invention;
Fig. 7 is the flow chart of second embodiment of the method for a kind of automatic configuring pressing table of the present invention;
Fig. 8 is the flow chart of the 3rd embodiment of the method for a kind of automatic configuring pressing table of the present invention;
Fig. 9 is a kind of application scenarios figure of method of a kind of automatic configuring pressing table of the embodiment of the invention.
Embodiment
The method of a kind of automatic configuring pressing table that the embodiment of the invention provides and apparatus for network node carry the identity information of inlet/outlet node by utilizing the mutual interactive messages of Ingress node and Egress node, the node of the described message of intermediate transit obtains the identity information of inlet/outlet node from this message, finish the configuration of pressing table.
Below in conjunction with accompanying drawing, elaborate a kind of method of configuring pressing table of the embodiment of the invention and the technical scheme of apparatus for network node.
With reference to figure 4, illustrate the structural representation of a kind of apparatus for network node of the embodiment of the invention; Described apparatus for network node comprises at least:
Information acquisition unit 1 is used for obtaining from described message the identity information of described node, and described identity information comprises: the network address of node or node identification;
Pressing table memory cell 2 is used to store pressing table;
Dispensing unit 3 is used for the described identity information that information acquisition unit 1 is obtained is recorded the pressing table of pressing table memory cell 2.
In another execution mode of the embodiment of the invention, described apparatus for network node further comprises:
In embodiments of the present invention, described first node can be Ingress node, and then Section Point is an Egress node, and so, the message that first node sends to Section Point can be Path message; Described first node is an Egress node, and then Section Point is an Ingress node, and so, the message that first node sends to Section Point can be Resv message;
Wherein, when described identity information is the network address of node, described dispensing unit 3 will be searched the NodeID of node corresponding according to the corresponding relation of the Node ID (node identification) of the network address of node and node, record in the pressing table.Preferably, replace the Node ID of node to come the building network topology, then directly the network address of node can be recorded pressing table with the address of node.The network address of described node can be IP (Internet Protocol, Internet protocol) address or MAC (Media Access Control, medium access control) address.
The apparatus for network node that the embodiment of the invention provides can be an assembly of equipment such as router or switching equipment or described equipment in real network.
Last mask body is illustrated a kind of apparatus for network node of the embodiment of the invention, below in conjunction with accompanying drawing, specifies the technical scheme of method of a kind of automatic configuring pressing table of the embodiment of the invention.
With reference to figure 5, illustrate the flow chart of method of a kind of configuring pressing table of the embodiment of the invention, described method comprises at least:
Step S1, the first node of network one end sends first message to the Section Point of this network other end, and described message carries identity information or the identity information of first node and the identity information of Section Point of first node;
Step S2, the intermediate node that receives described first message extracts the identity information that described first message is carried, and described identity information is recorded in the pressing table of self, and with described first forwards to next node;
After step S3, described Section Point receive described first message, extract the identity information of described first node, and the identity information of described first node is recorded in the pressing table of described Section Point.
Wherein, described identity information comprises: the Node ID of the network address of node or node, and when described identity information was the network address of node, the step that in the described method described identity information is recorded pressing table specifically comprised:
A, obtain the NodeID of respective nodes according to the corresponding relation of the Node ID of the network address of node and node;
B, the Node ID of respective nodes is recorded in the pressing table of this node.
In a kind of execution mode of the embodiment of the invention, described first node can be Ingress node, and then Section Point is an Egress node, and so, the message that first node sends to Section Point can be Path message; Described first node is an Egress node, and then Section Point is an Ingress node, and so, the message that first node sends to Section Point can be Resv message;
Below on the whole the method for a kind of configuring pressing table of the embodiment of the invention is described, below in conjunction with Fig. 6, Fig. 7 and Fig. 8, with RSVP (Resource ReservationProtocol-Traffic Extension based on the traffic engineering expansion, RSVP-TE) Ingress node and Egress node are example by Path message and Resv interacting message in, specifically set forth technical scheme of the present invention.
When setting up a LSP connection, when Ingress node was only known the node identification (Node ID) of self, as shown in Figure 6, a kind of method of automatic configuring pressing table comprised:
Step S1, in sending to the Path message of Egress node, carries Ingress node the Node ID (node identification) of Ingress node, Node ID as Ingress node is 1, specifically can utilize 16 bits (0x00) before the LSP ID in sender's masterplate object (as shown in table 1) of Path message to identify the Node ID (as: 1) of Ingress node.
Table 1, sender's masterplate object
| Length (length) | Class Number (class-mark) | Class Type (classification) |
| (＝12) | (＝11) | ?(＝7) |
| IPv4 Tunnel Sender Address (sender address, IPv4 tunnel) (32bit) | ||
| 0x00(16bit) | LSP ID (LSP sign) (16bit) | |
Step S102, intermediate node (has only an intermediate node in this example, in real network, can comprise a plurality of intermediate nodes) receive Path message after, the Node ID that extracts Ingress node from this Path message is 1, and records in the pressing table of this intermediate node.
Step S103, intermediate node sends to next node with described Path message, has only an intermediate node in this example, next node is Egress node, therefore, Path message is sent to Egress node, if there are a plurality of intermediate nodes, then the processing of all the other intermediate nodes is identical with intermediate node handles in this example.
After step S104, Egress node received Path message, the NodeID that extracts Ingress node from this message was 1, and records in the pressing table of Egress node;
Step S105, Egress node returns a Resv message to Ingress node, and in this message, carry the Node ID (as: 2) of himself, specifically can utilize the middle Tunnel ID of session object (as shown in table 2) 16 bits (0x00) before to identify the Node ID of Egress node.
Table 2, session object
| Length (length) (=16) | Class Number (class-mark) (=1) | Class Type (type) (=7) |
| IPv4 Tunnel Endpoint Address (IPv4 tunnel tail-end address) (32bit) | ||
| 0x00(16bit) | Tunnel ID (Tunnel Identifier) (16bit) | |
| Extended Tunnel ID (expansion Tunnel Identifier) (32bit) | ||
Step S106, after intermediate node receives Resv message, the NodeID that extracts the Egress node in this message is 2, and record in the pressing table, at this moment, the pressing table of intermediate node has write down the Node ID about the Ingress node of this connection and Egress node, has finished the interpolation of the pressing table of this connection.
Step S107, intermediate node with described Resv forwards to next node, in this example, because have only an intermediate node, just be transmitted to Ingress node, if there are a plurality of intermediate nodes, the processing of the intermediate node in the processing of all the other intermediate nodes and this example is identical.
After step S108, Ingress node received described Resv message, the Node ID that extracts Egress node from this message was 2, and records in the pressing table.
So far, connection in the present embodiment from the Ingress node to the Egress node (or path) all nodes of process all write down the Node ID (1) of Ingress node of this connection and the Node ID (2) of Egress node, finished the configuration of the pressing table of this connection, for other connections, adopt above-mentioned identical method, carry out the configuration of pressing table.
In another execution mode of the embodiment of the invention, as shown in Figure 7, when the Ingress node of a connection except the Node ID that knows self, also know the Node ID of Egress node, then a kind of method of automatic configuring pressing table comprises:
Step S201 carries the Node ID of Ingress node and the Node ID of Egress node simultaneously in Ingress node sends to the Path message of Egress node, as: 1 and 2.(16 bits (0x00) before the interior LSP ID identify the NodeID of Ingress node and Egress node specifically to utilize sender's masterplate object as shown in table 1, for example: among the described 16bit, the Node ID of preceding 8 bit-identify Ingress nodes, the Node ID of back 8 bit-identify Egress nodes;
After step S202, intermediate node receive described Path message, from this message, extract the Node ID of Ingress node and Egress node, and record in this intermediate node pressing table.
Step S203, intermediate node is transmitted described Path message to next node, has only an intermediate node in this example, therefore next node is Egress node, if there are a plurality of intermediate nodes, then Path message is transmitted to all the other intermediate nodes successively, and the processing of intermediate node is identical in the processing of all the other intermediate nodes and this example;
After step S204, Egress node receive described Resv message, from this message, extract the Node ID (because it knows the Node ID of self, so only extracted the Node ID of Ingress node) of Ingress node, and record in its pressing table.
So far, all nodes that this connection is experienced in the present embodiment are all known and have been write down the Ingress node of this connection and the Node ID of Egress node (1 and 2), finished the configuration of pressing table.
In another execution mode of the embodiment of the invention, as shown in Figure 8, when the Egress node of a connection except the Node ID that knows self, also know the Node ID of Ingress node, then a method of planting configuring pressing table automatically comprises:
Step S301, in sending to the Resv message of Ingress node, Egress node carries the Node ID of Ingress node and the Node ID of Egress node simultaneously, as: 1 and 2, specifically utilize the interior TunnelID of session object as shown in table 2 16 bits (0x00) before to identify the Node ID of Ingress node and Egress node, for example: can utilize the Node ID of the preceding 8 bit-identify Egress nodes of described 16bit, the Node ID of back 8 bit-identify Ingress nodes;
After step S302, intermediate node receive described Resv message, from this message, extract the Node ID of Ingress node and Egress node, and record in this intermediate node pressing table.
Step S303, intermediate node is transmitted described Resv message to next node, has only an intermediate node in this example, therefore next node is Egress node, if there are a plurality of intermediate nodes, then Resv message is transmitted to all the other intermediate nodes successively, and the processing of intermediate node is identical in the processing of all the other intermediate nodes and this example;
After step S304, Ingress node receive described Resv message, from this message, extract the Node ID (because it knows the Node ID of self, so only extracted the Node ID of Egress node) of Egress node, and record in its pressing table.
So far, all nodes that this connection is experienced in the present embodiment are all known and have been write down the Ingress node of this connection and the Node ID of Egress node (1 and 2), finished the configuration of pressing table.
In the another kind of execution mode of the embodiment of the invention, as shown in Figure 9, source, the Su Duan that connects as LSP is positioned at the situation outside the network of setting up pressing table, that is: the node of initiation Path and Resv message is not the Ingress node 2 and the Egress node 7 of network, but is positioned at node A and B outside the loop network that need set up pressing table.For this, receive the Path message of A transmission when Ingress node 2 after, in Path message, increase the Node id information of node 2 self, 16 Node ID that come identification nodes 2 in the sender's masterplate object shown in can use table 1 before the LSP ID, thereafter after each node receives described Path message, from this Path message, extract the Node ID of Ingress node, and record pressing table.
After the Node B of Su Duan receives Path message, return Resv message to the A node, after Egress node 7 receives Resv message, the Node ID of self is put in the Resv message, 16 Node ID that come identification nodes 7 in the session object shown in can use table 2 before the Tunnel ID after each node receives Resv message thereafter, extract the Node ID of Egress node, and record pressing table, so just on each node that this LSP connects, finished the configuration of pressing table.
It more than is the preferred implementation of the embodiment of the invention; those of ordinary skill in the art can improve under the principle of the invention and change; also in protection scope of the present invention; as: the Node ID that does not carry inlet or Egress node in the above-described embodiments; and the network address (comprising: IP address or MAC Address) of only carrying Ingress node and Egress node; after having obtained the network address of Ingress node and Egress node in the then described method, further comprise:
A, obtain described Ingress node or/and the Node ID of Egress node according to the network address of node and the corresponding relation of Node ID;
B, with described Ingress node or/and the Node ID of Egress node record in the described pressing table.
Except the corresponding relation that utilizes the network address and Node ID, can also directly utilize the network address to identify Node ID, after node gets access to the network address of inlet/outlet node, directly it is recorded pressing table and get final product.
What deserves to be explained is that above is the technical scheme of example with the explanation embodiment of the invention with the RSVP-TE agreement only, those of ordinary skill in the art will be appreciated that technical scheme of the present invention goes for the network towards interconnection technique, as: MPLS (Multi-protocol Label Switch, multiprotocol label switching) network, T-MPLS (Transport Multi-protocol Label Switch, the transmission multiprotocol label switching) network, PBT (Provider Backbone Transport, operator backbone transmission) network etc.
In sum, the method and the apparatus for network node of a kind of automatic configuring pressing table that the embodiment of the invention proposes, (comprising: the Node ID of the network address of node and node) be carried in Ingress node and the Egress node interactive messages by identity information web portal node or Egress node, as: Path message and Resv message, middle all nodes of transmitting this message obtain described Ingress node or/and the identity information of Egress node from this message, and record in the pressing table, reach automatic configuring pressing table purpose, reduced the workload of operating personnel's configuring pressing tables like this, improve work and imitated, and reduced the difficulty of maintenance management.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (8)
1. the method for an automatic configuring pressing table is characterized in that, comprising:
First node sends first message to Section Point, described first message carries the identity information of first node or the identity information of first node and Section Point, wherein, first message is based on the Path message in the RSVP of traffic engineering expansion, the identity information of the described first node of 16 bit identification in sender's masterplate object of described Path message before the LSP ID or the identity information of first node and Section Point, perhaps first message is based on the Resv message in the RSVP of traffic engineering expansion, the identity information of the described first node of 16 bit identification in the session object of described Resv message before the Tunnel ID or the identity information of first node and Section Point;
The intermediate node that receives described first message extracts the identity information that described first message is carried, and described identity information is recorded in the pressing table of self, with described first forwards to next node;
After described Section Point receives described first message, extract the identity information of described first node, and the identity information of described first node is recorded in the pressing table of described Section Point.
2. the method for claim 1, it is characterized in that, first message that sends to Section Point when first node only carries the identity information of described first node and first message when being Path message, after described Section Point receives described first message, extract the identity information of described first node, and the identity information of described first node is recorded after the step in the pressing table of described Section Point, described method further comprises:
Described Section Point feeds back second message according to the transmission path of described first message to described first node, described second message carries the identity information of described Section Point, wherein, described second message is based on the Resv message in the RSVP of traffic engineering expansion, the identity information of the described Section Point of 16 bit identification in the session object of described Resv message before the Tunnel ID;
The intermediate node that receives described second message extracts the identity information that described second message is carried, and described identity information is recorded in the pressing table of self, and with described second forwards to next node;
After described first node receives described second message, extract the identity information of described Section Point, and the identity information of described Section Point is recorded in the pressing table of described first node.
3. method as claimed in claim 1 or 2 is characterized in that, described identity information comprises: the network address of node or node identification.
4. method as claimed in claim 3 is characterized in that, when described identity information was the network address of node, the step that in the described method described identity information is recorded in the pressing table specifically comprised:
Obtain the node identification of respective nodes according to the corresponding relation of the network address of node and node identification;
The node identification of respective nodes is recorded in the pressing table of this node.
5. an apparatus for network node is characterized in that, comprising:
The message sink unit, be used to receive the message that other node sends, wherein, described message is based on the Path message in the RSVP of traffic engineering expansion, the identity information of the described node of 16 bit identification in sender's masterplate object of described Path message before the LSP ID, perhaps described message is based on the Resv message in the RSVP of traffic engineering expansion, the identity information of the described node of 16 bit identification in the session object of described Resv message before the Tunnel ID;
Information acquisition unit is used for obtaining from the message that described message sink unit receives the identity information of described node;
The pressing table memory cell is used to store pressing table;
Dispensing unit, the identity information that is used for node that information acquisition unit is obtained records the pressing table of pressing table memory cell.
6. apparatus for network node as claimed in claim 5 is characterized in that, described apparatus for network node also comprises:
The message arrangement unit is used for adding the identity information of this node device to message;
Message sending unit is used for the message of message arrangement configuration of cells is sent.
7. as claim 5 or 6 described apparatus for network node, it is characterized in that described identity information comprises: the network address of node or node identification.
8. apparatus for network node as claimed in claim 7 is characterized in that, this apparatus for network node is router or switching equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100313858A CN101436952B (en) | 2007-11-14 | 2007-11-14 | Method for automatically configuring pressing table and network node equipment |
| PCT/CN2008/072990 WO2009067909A1 (en) | 2007-11-14 | 2008-11-08 | A method, network node device and system for configuring a squelch table automatically |
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| CN2007100313858A CN101436952B (en) | 2007-11-14 | 2007-11-14 | Method for automatically configuring pressing table and network node equipment |
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| CN101436952B true CN101436952B (en) | 2011-10-05 |
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| CN102801596B (en) * | 2012-06-11 | 2015-01-21 | 华为技术有限公司 | Service processing method for ring network and network equipment |
| CN103384220B (en) * | 2013-06-28 | 2017-07-07 | 华为技术有限公司 | A kind of method for building up of Traffic Engineering Label switching path, equipment and system |
| CN106331204B (en) * | 2015-07-01 | 2019-10-25 | 华为技术有限公司 | A kind of motion management method and the network equipment |
| CN105553832A (en) * | 2015-12-25 | 2016-05-04 | 北京奇虎科技有限公司 | Message sending and receiving method and device |
| CN107360296B (en) * | 2017-06-29 | 2019-11-01 | 瑞斯康达科技发展股份有限公司 | A kind of method and SDH terminal device for transmitting official telephone business |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1906875A (en) * | 2004-03-22 | 2007-01-31 | 华为技术有限公司 | Automatic update of squelch tables for optical network applications |
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| JP3797470B2 (en) * | 2000-08-31 | 2006-07-19 | 富士通株式会社 | Transmission device having function of switching line when transmission line failure occurs |
| JP3844982B2 (en) * | 2001-09-10 | 2006-11-15 | 富士通株式会社 | Transmission equipment |
| JP2007088961A (en) * | 2005-09-26 | 2007-04-05 | Fujitsu Ltd | Signal transmission method and device thereof |
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| CN1906875A (en) * | 2004-03-22 | 2007-01-31 | 华为技术有限公司 | Automatic update of squelch tables for optical network applications |
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| CN101436952A (en) | 2009-05-20 |
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