CN1474977A - Robust method and apparatus for processing cable modem configuration files - Google Patents
Robust method and apparatus for processing cable modem configuration files Download PDFInfo
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- CN1474977A CN1474977A CNA018189474A CN01818947A CN1474977A CN 1474977 A CN1474977 A CN 1474977A CN A018189474 A CNA018189474 A CN A018189474A CN 01818947 A CN01818947 A CN 01818947A CN 1474977 A CN1474977 A CN 1474977A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/02—Standardisation; Integration
- H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/02—Standardisation; Integration
- H04L41/0233—Object-oriented techniques, for representation of network management data, e.g. common object request broker architecture [CORBA]
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Abstract
An apparatus for processing simple network management protocol object identifiers in a network management file. The objects are classified as to scalar or tabular values and further classified according to the number of digits in each object identifier and the number of unlike values within the digits. Packet data units are then created incorporating similar object types. Each packet data unit is then individually processed. By first classifying and then processing the SNMP objects, the impact of corrupted or erred objects on the network management process is minimized.
Description
Invention field
The present invention relates generally to cable modem (cable modem), specifically, relate to the method and apparatus that is used for handling reliably cable modem configuration files, wherein said file is Simple Network Management Protocol (SNMP) Format Object.
Background technology
Present speed by the telephone modem access the Internet is the highest can to reach 56Kbps.Based on the modulator-demodular unit modulation and demodulation data-signal of phone, on voice band (voice-band) telephone network, transmit being used for.Comparatively speaking, cable modem is by the cable television system access the Internet, and cable television system has higher bandwidth, so it just can be worked under the message transmission rate higher than telephone system.Cable modem provides being connected between the headend (headend) of subscriber computer or other communication facilities and wired system, by headend, can obtain through the visit of (for example) T1 transmission line to the Internet or other external network.In cable network, be called downlink data from the network data transponder to the data of user or client's transmission, be called upstream data from the client to the data of network data transponder transmission.
Block scheme at Fig. 1 has shown the example that adopts the two-way wired system (cablesystem) of prior art.The wired system of prior art comprises headend equipment 101, Hybrid Fiber Coax (HFC) cable machinery 103, a plurality of cable modem 105 and 106 (only having shown two) and is connected to corresponding a plurality of user communication devices 107 and 108 (only having shown two) of cable modem 105 and 106 by corresponding communication links 116 and 117. Communication facilities 107 and 108 example comprise computing machine, TV or phone.Just as known in the art, data transfer equipment 101 comprises processor, router, switch, broadband downstream transmitter, goes up line receiver, divider, compositor (combiner), customer data base, Network Management Station, DHCP (DHCP) server and generic-document host-host protocol (TFTP) server, calls out generation (call agent), media gateway and charge system (billing system).HFC cable machinery 103 comprises optical cable, concentric cable, optical fiber/coaxial node, amplifier, wave filter and tap (tap), it is supported in shares on the down channel 110 from headend equipment 101 to the transmission of cable modem 105 and 106 with sharing on the up channel 112 from cable modem 105 and 106 transmission to headend equipment 101.As shown in the figure, as will be explained below, programme signal is input in the headend equipment 101, broadcasts to wire user.
Each channel 110 and 112 can use different host-host protocols to carry out information communication.Usually, the modulation that is used for uploading carry information at down channel 110 (for example, 64-quadrature amplitude modulation (QAM)) (for example than the modulation that is used for uploading carry information at up channel 112, it is high that Differential Quadriphase Shift Keying (DQPSK) or priority 16-QAM) are wanted, and this has caused downlink transfer faster than the speed of uplink.The wired system that uplink speed is lower than downlink transfer speed is called " asymmetric " system.Uplink speed and the essentially identical wired system of downlink transfer speed are called " symmetry " system.
Except the concrete modulation type that uses on channel 110 and 112, channel 110 and 112 sharing characteristic have also caused the demand to other agreement.For example, because down channel 110 is shared, so descending protocol comprises address information, and cable modem 105 and 106 monitors the information block that is addressed to it on the down channel 110.Only be addressed to specific cable modem 105 or 106 (or additional communication facilities 107 or 108), or be addressed to all (promptly, broadcast) information block of cable modem 105 or 106 (or additional communication facilities 107 or 108) is handled by cable modem 105 or 106, and it is dealt into corresponding user communication device 107 or 108.Because up channel 112 is shared, so be to design according to the possibility that the communication information that reduces from cable modem 105 and 106 clashes.The multiple access agreement of various definitions up channel visit is arranged now, comprise well-known agreement such as ALOHA, time slot-ALOHA, CDMA (CDMA), time division multiple access (TDMA) (TDMA), the TDMA that has collision detection and carrier sense multiple access (CSMA).
The uplink and downlink channel agreement that defines is observed and used to some two-way wired systems in 1.0 editions standards of data cable service interface standard (DOCSIS) issue recently, by name.Up agreement by the DOCSIS standard definition adopts the TDMA method, its timing be by headend equipment 101 (in the DOCSIS standard, be called cable modem termination station (CMTS)) control, and the timestamp synchronization message of warp emission on down channel 110 is communicated by letter with cable modem 105,106.Therefore, for allow uplink communication can be in an orderly manner, high-quality carrying out, before cable modem 105 and 106 began the information that is provided by user communication device 107 and 108 is provided, each cable modem 105 and 106 time reference must be synchronous completely with the similar time reference in the headend equipment 101.If lack enough synchronously, just may clash from the information transmission of a modulator-demodular unit 105 with information transmission from another modulator-demodular unit 105.
Fig. 2 is on client or the user site, comprises the block scheme that line component is arranged of cable modem 105.From user's angle, 134 pairs of input signals of divider distribute, so under the control of set-top box 138, program signals on televisor 140.Second lead-out terminal of divider 134 is provided to the connection of cable modem 105.Downgoing signal from HFC cable machinery 103 offers RF (radio frequency) tuner 142, and RF tuner 142 becomes to distribute to the frequency of cable modem 105 with frequency tuning between the starting period of modulator-demodular unit.Downgoing signal demodulation in detuner 144, and its output is input in the MAC controller 146.Signal from MAC controller 146 is input to data and steering logic unit 148, the operation of data and the whole cable modem 105 of steering logic unit 148 controls, and Data Control and collecting function are provided.
Get back to Fig. 1, headend equipment device 101 is (downlink, land microwave or land line via satellite) program receiving signal also, with by cable modem 105 and 106, is broadcast to communication facilities 107 and 108 respectively.Programme signal transmits on the 6MHz of down channel 110 wave band, and this distributes to the CATV (cable television) channel this wave band, is used for the spectral range to all users broadcasting programme signals.(the international spectrum bandwidth is 8MHz.) the user here, set-top box 138 program receiving signals, and cable modem 105 or 106 difference downlink data receivings.The number of the uplink and downlink data channel in the given cable modem is based on coverage, number of users, distribute to that each user's data transfer rate and usable spectrum design.
When cable modem 105 or 106 powers up, just use Internet protocol (IP) to set up the connection of headend equipment 101, therefore the data from the IP form of external network 114 just can descendingly send to cable modem 105 or 106.After powering up, cable modem 105 and 106 channel allocation that receive from headend equipment 101. Cable modem 105 and 106 is also got in touch with DHCP (DHCP) server, to download the name of modem configuration files.By using the name of this configuration file, cable modem 105 and 106 and generic-document host-host protocol (TFTP) server of store configuration files get in touch.At last, configuration file downloads to cable modem 105 and 106 from tftp server.Information in the configuration file can allow cable modem 105 and the 106 spendable operation of cable modem softwares of identification and identification can download to the position of cable modem 105 and 106 function softwares.
The Network Management Function of network manager execution monitoring and control various network elements.The example of network element comprises: cable modem 105 and 106, main frame, gateway, terminal and server.Every kind of network element all comprises administration agent, is used to carry out the desired Network Management Function of network manager.Use SNMP (Simple Network Management Protocol) agreement next Network Management Station and communications between agents network management information at each network element.Snmp protocol has defined the operation and the form and the explanation of the data of exchange between management entity (being Network Management Station and administration agent) of form, revisable management control of scope, the expression management information of management information.Can be configured cable modem 105 and 106, to stop the visit of undelegated management station.
According to snmp protocol, represent network management information with ASN.1 language (abstract syntax notation (Abstract SyntaxNotation), version 1).Snmp protocol has defined the diverse network bookkeeping, such as changing and checking variable in TLV (type-length-value) the data character string that is stored among each network equipment agency.Therefore, the network agent of hardware device uses snmp protocol and management station to carry out alternately, to obtain the variable in (obtaining) or change (setting) data character string.Using the TLV form is two with the restricted number of the management function of management station's use: one is operating as specific configuration or supplemental characteristic character string assignment, and another operates value.Listing in the management information bank (MIB) in each network equipment agency can be by the configuration or the parameter of network management management.
Simple Network Management Protocol is network management-application software asks or the most frequently used agreement of Control Network agency.Network agent is to go up the software of carrying out at the network equipment (such as workstation or router), and has the ability of collecting device operation information, and Network Management Station just can be obtained this information then.These data are collected and stored to Network Management Station.Network manager and network agent are all carried out and can be allowed data carry out the network management software of exchanges data between network manager and controlled network agent.Equally, as well-known in those of ordinary skills institute, Network Management Station is carried out and can be allowed it carry out the network management software of Network Management Function.All use the SNMP of internet protocol version at most of network management-application software.Snmp protocol is operated on Internet protocol.
Management information bank (MIB) has been described the data that can be obtained or be revised by Network Management Station on network.By management information bank, Network Management Station can be known the aspect that information that network agent has and equipment can be controlled.The control function that network manager is carried out comprises those and the device-dependent function of network interaction and the operation of equipment self.
Management information bank on the network agent is the warehouse (repository) of character of the operating parameter of marked network equipment (such as network interface unit, hub, switch or router).By revising these parameters, network manager is controlled the network equipment.Except controlling the associated network equipment, network agent is statistics collection information also, and respond request from network manager in the mode of applicable agreement defined.
As mentioned above, by dispose the cable modem that DOCSIS authorizes from the tftp server download configuration file.Configuration file can comprise the parameter of SNMP type-length-value word format.The type field of type-length-value form is the byte sign that is defined in the configuration parameter of listing in the value field.Length field is one-byte field equally, is used for identifying the length of closelying follow value field thereafter.The scope of value field is one to 254 byte, and comprises the particular value of configuration parameter.Cable modem 105 and 106 must be handled in the files all the SNMP TLV except the incorrect or unknown TLV of form.In case in file type, find mistake, just no longer such TLV handled.Therefore, needed is more effective TLV to be handled, and when allowing effective TLV handled, allows to ignore ruined or unknown TLV.
Each cable modem 105 and 106 all comprises network management proxy and associated MIB.Docsis specification has been determined the MIB that the network management proxy of those cable modems must be supported.Each MIB relates to the one or more attributes or the feature of equipment, and every kind of such attribute or feature be all by object identity, or is called OID, definition.The long number that the numeral that each OID is separated by fullstop is formed.For example, 1.3.5.7.8.10.12.3 is exactly an OID.The OID of the configurable device attribute that maybe can be provided with value same and that attribute (for example, speed, time, temperature) is relevant.Just simply provide information for not configurable device attribute, so OID and configurable element are irrelevant.
A kind of technology that is used for disposing cable modem is positioned over configuration file with OID, and requires cable modem to resemble to treat them by the OID of Network Management Station setting.Give an example, certain OID has determined which network manager can visit cable modem.The people who is familiar with the details of operation of cable modem can restart (power cycle) cable modem, (thereby by certain object is set through object identity) activates certain characteristics, then, other object further is set, cable modem is conducted interviews to stop other network manager.After stoping visit, the Network Management Station relevant object that just can not read or reset with wired system.In order to prevent this from occurring, in configuration file, comprise suitable information, security feature when powering up, cable modem is set.In case be provided with security feature, the Network Management Station that only in security set, has identified could to the cable modem object conduct interviews and, write or be provided with.In this manner, the wired system manipulater just can guarantee to have only titular Network Management Station could visit the cable modem network agency.
Description of drawings
After the description of having read, can easierly understand the present invention, and be easier to understand further advantage of the present invention and to its use, in the accompanying drawings to preferred embodiment and following accompanying drawing:
Fig. 1 and Fig. 2 are the electrical block diagrams of the two-way wired communication system of typical prior art;
Fig. 3 illustrates the packet unit of the present invention's instruction; With
Fig. 4 is a processing flow chart of realizing the present invention's instruction.
Embodiment
Be used for handling in detailed description the present invention simple management protocol type-length-value word concrete grammar and the device before, be noted that at first the present invention mainly is the novel combination to some steps and device.Therefore, nextport hardware component NextPort among the figure and method step are represented by the conventional element among the figure, those specific details relevant with the present invention will only be introduced, thereby openly impact of the present invention without concrete structure, these concrete structures that have in the advantage of this explanation are conspicuous to those skilled in the art.
Under the SNMP standard, each object identity all is to represent some aspects of the equipment of being managed (such as cable modem 105 and 106) or the numerical value of feature.Use object identity (or OID) identifies the row in concrete object or the table, and each sign all is made up of a series of numerals.MIB has defined a series of numerals, and network agent and Network Management Station just can both be explained these numerals like this.
Receive after the configuration file when modulator-demodular unit starts, modulator- demodular unit 105 and 106 just receives a plurality of TLV to handle. Cable modem 105 and 106 is divided into a plurality of Packet Data Units according to type field with the TLV word.OID represents a kind of TLV word type, so all OID assign in the Packet Data Unit group, to handle.The OID numerical string is the value of TLV form.According to application standard, the prior art SNMP agency who is used to handle TLV handles all OID as one group, up to finding mistake.In case found mistake, just no longer handled the OID in this Packet Data Unit.That handles mistake can cause configuration error with remaining OID failure, or control of limiting network manager and monitoring network agency's ability.
According to instruction of the present invention, in modulator- demodular unit 105 and 106, network agent is at first pressed lexicographic order storage OID.That is to say, according to the number ordering of numeral among the OID.For example, the OID of all six figure places is grouped in together; The OID of all seven figure places is grouped in together, or the like.In addition, or replace the lexicographic order ordering, then OID is classified (sorted) in scalar (scalar) (that is, single object value) and form (tabular) object value.The table objects value is meant and comprises a plurality of objects in delegation.Be not that all OID are handled as one group, the present invention is divided into a plurality of Packet Data Units with OID.In one embodiment, all scalar value are all assigned in the Packet Data Unit, handle then.All table objects are also all assigned in the Packet Data Unit and are handled, or all OID of a table row are assigned in the Packet Data Unit group.In another embodiment, the OID with all same numbers assigns in the Packet Data Unit.
Following Example is used to illustrate instruction of the present invention.Always the scalar value that finishes with " 0 " is grouped in together such as two that list below.
1.3.6.1.2.1.1.4.0 sysContact
1.3.6.1.2.1.1.5.0 sysName
OID numeral 1.3.6.1.2.1.1 marked network agency's set of systems.Above in the object of two signs, one with numeral " .4 " sign, another is with numeral " .5 " sign.Two object identities all finish with zero, represent that they are scalar value.According to these definition of object, they all provide Network Management Station to its read of carrying out." sysContact " to as if the contact person's of this management node the words identification and the information of how getting in touch with this contact person." sysName " distributes name to the management that likes this node.Traditionally, this is the fully qualified domain name of this node.
Below three to as if from same table, obtain, and be grouped in together.(7) at end represent that these objects are from the 7th row in the table.Second, third of penult numeral (2,3 and 4) expression the 7th row and the 4th row.Tabulation OID is never with zero ending; But with row number end.Be also noted that, in the present invention because the number difference of numeral among the OID, these objects with list above two to as if separate.
1.3.6.1.2.1.1.9.1.2.7?sysORID
1.3.6.1.2.1.1.9.1.3.7?sysORDESCR
1.3.6.1.2.1.1.9.1.4.7?sysORUptimeNODE
Below three objects be grouped in together equally because they are arranged in the tenth five-element of table, what identified classifies two, three and four as.
1.3.6.1.2.1.2.2.1.2.15?ifDEFCR
1.3.6.1.2.1.2.2.1.3.15?ifTYPE
1.3.6.1.2.1.2.2.1.4.15?ifMTU
As mentioned above, the object that defines in identical MIB is all shared same OID numeral, and this is because need identify the defined different objects by MIB with unique OID.
Instruction during Fig. 4 illustrates according to the present invention comes the process of process object.Fig. 4 starts from opening beginning step 210, and enters the step 212 that cable modem 105 or 106 receives configuration file.Although use configuration file, it should be understood by one skilled in the art that the present invention can use the TLV of any use OID form and the network management file of SNMP parameter here as examples of applications of the present invention.SNMP object in the configuration file identifies at step 214 place.Should remember that configuration file comprises a plurality of parameters that are used to be provided with and dispose cable modem; Many parameters in these parameters are all irrelevant with the network management aspect relevant with snmp protocol.At determining step 215 places, make whether the judgement that also the OID that does not handle is arranged.If no, process just forwards mode of operation 226 to.
If also have untreated OID, process just forwards the step 216 of assessment OID to.In fact, other OID had only in the different group of digital value during OID was assigned to numeral with similar number and each OID and organizes.In order to realize this grouping, the number of the numeral among the OID is calculated at step 216 place.Process forwards determining step 218 to then, will work as number digital among the OID of number digital among the OID of pre-treatment and (most previous) processing recently and compare.For passing through determining step 218 for the first time, owing to there not being former value to come comparison, so the result is sure.Because the result of determining step 218 is sure, process just forwards determining step 220 to, comes each digital value of each OID of comparison.Should remember that all OID of given object have only a numeral different.Because be to pass through determining step 220 for the first time, so the result is sure, process just forwards step 216 to so, fetch (retrieve) and the next OID of assessment.Now, process forwards determining step 218 to and assesses next OID.If first and second OID have the numeral of similar number, the result of determining step is exactly sure so, and process just forwards determining step 220 to.Here, each numeral of OID is tested, if they have only the value difference of a numeral, process is just got back to step 216.In this manner, in execution in step 216,218 and 200, just generate like the category (be defined as numeral, and have only the value of a numeral different) OID with similar number.When determining step 218 or 220 produced the response negating, this group had just been closed (seeing step 222).In case generated OID like the category that is called Packet Data Unit, just handled them in step 224.As discussed above, this group is called Packet Data Unit.Processing to OID comprises judging whether they have any mistake or ruined position, and the object of OID indication is set to the value relevant with OID.In addition, in instruction of the present invention, all scalar OID separate from form OID, and assign to together in the Packet Data Unit from the form OID of identical table.
Therefore, in instruction of the present invention, the indivedual ruined or unreadable object in Packet Data Unit can not cause all OID in the configuration file all to be left in the basket.On the contrary, because each Packet Data Unit includes only relevant OID,, and therefore cause whole group to be dropped if an OID in the grouping is destroyed, OID in other grouping can not be affected, and therefore can set up or be provided with the feature and the aspect of equipment.This technology has been guaranteed various SNMP objects are used to greatest extent, therefore by the relation between network/manager agency, provides maximum network management capabilities.In the prior art, when having only an object destroyed or unreadable, will ignore a plurality of objects in the Packet Data Unit, therefore limit Network Management Function.
Although here invention has been described with reference to preferred embodiment, those of ordinary skills are to be understood that, under the situation that does not deviate from scope of the present invention, can carry out various changes to the present invention, and can replace the element among the present invention with equal element.The present invention in addition, under the situation that does not deviate from main scope of the present invention, can carry out some modifications, so that can better adapt to special applications.Therefore, the present invention is not limited to come disclosed specific embodiment as realization best mode of the present invention here, and the present invention can comprise all embodiment in the scope that falls within additional claims.
Claims (19)
1. having the network that is used for controlling by the use object identity network manager of a plurality of network agents, a kind of method that is used to handle a plurality of object identities is arranged, this method comprises:
Described object identity is categorized into group with similar object identity;
The group of each similar object identity is assembled Packet Data Unit; With
Handle each Packet Data Unit independently.
2. method described in claim 1, wherein said similar object identity comprise the whole object identities that comprise n numeral.
3. method described in claim 2, wherein said similar object identity comprise the whole object identities with n numeral, and wherein except a value, all described n digital values are all identical.
4. method described in claim 1, wherein said similar object identity comprise whole scalar objects signs.
5. method described in claim 1, wherein said similar object identity comprises all forms object identity.
6. method described in claim 4, wherein said table objects sign number is divided into groups according to table row.
7. method described in claim 1, wherein said network agent is relevant with the network equipment.
8. method described in claim 6, the wherein said network equipment comprises cable modem.
9. in a kind of wired system, wherein come configure network devices by the configuration file that comprises configuration variables, the form of configuration variables can be discerned by network agent, and a kind of method that is used to handle a plurality of configuration variables is arranged, and it comprises:
(a) sign has the described configuration variables of n numeral;
(b) have the configuration variables group of n numeral from each, be identified at and have only a described configuration variables that digital value is different in the described n numeral;
(c) configuration variables that is identified is assembled a Packet Data Unit; With
(d) handle each Packet Data Unit.
10. as method as described in the claim 9, that wherein said Packet Data Unit comprises numeral with similar number and in described numeral, have only the whole scalar configuration variables that value is different,
11. method described in claim 9, wherein each Packet Data Unit comprises the form configuration variables from described identical table row.
12. method described in claim 9, wherein said configuration variables comprises object identity.
13. method described in claim 9, the wherein said network equipment comprises cable modem.
14. a product, it comprises:
Computer-usable medium with computer readable program code, described code are used for handling a plurality of object identities at network, and described network has the network manager that is used for controlling by the use object identity a plurality of network agents, comprising:
Computer readable program code is configured, described object identity is divided into similar object identity group;
Computer readable program code is configured, so that each similar object identity group is assembled Packet Data Unit; With
Computer readable program code is configured, to handle each Packet Data Unit independently.
15. as method as described in the claim 14, wherein said similar object identity comprises having to have only all different object identities in a n numeral and the described n numeral.
16. as method as described in the claim 14, wherein said similar object identity comprises all forms object identity.
17. method described in claim 14, wherein said similar object identity comprises all forms object identity from described identical table row.
18. method described in claim 14, wherein said network agent comprises cable modem.
19. the network with network manager is used for by using object identity to control a plurality of network agents a kind of device that is used to handle a plurality of object identities being arranged in this network, it comprises:
Be used for described object identity is categorized into first module of similar object identity group;
Be used for each similar object identity group is assembled second module of Packet Data Unit; With
Be used for handling independently the three module of each Packet Data Unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71545000A | 2000-11-17 | 2000-11-17 | |
| US09/715,450 | 2000-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1474977A true CN1474977A (en) | 2004-02-11 |
Family
ID=24874092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA018189474A Pending CN1474977A (en) | 2000-11-17 | 2001-10-30 | Robust method and apparatus for processing cable modem configuration files |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1348170A2 (en) |
| KR (1) | KR20030048475A (en) |
| CN (1) | CN1474977A (en) |
| AU (1) | AU2002239556A1 (en) |
| CA (1) | CA2428464A1 (en) |
| WO (1) | WO2002042882A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423492C (en) * | 2006-03-15 | 2008-10-01 | 杭州华三通信技术有限公司 | Management information base processing method |
| CN102255719A (en) * | 2010-05-17 | 2011-11-23 | 华为终端有限公司 | Method and device for realizing synchronization of cable modem |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117358A2 (en) | 2004-05-25 | 2005-12-08 | Cisco Technology, Inc. | Wideband protocol |
| US7539208B2 (en) | 2004-05-25 | 2009-05-26 | Cisco Technology, Inc. | Timing system for modular cable modem termination system |
| US7646786B2 (en) | 2004-05-25 | 2010-01-12 | Cisco Technology, Inc. | Neighbor discovery in cable networks |
| US7532627B2 (en) | 2004-05-25 | 2009-05-12 | Cisco Technology, Inc. | Wideband upstream protocol |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3483364B2 (en) * | 1995-09-07 | 2004-01-06 | Ｋｄｄｉ株式会社 | SNMP / OSI management gateway device |
| US6052724A (en) * | 1997-09-02 | 2000-04-18 | Novell Inc | Method and system for managing a directory service |
| US6018767A (en) * | 1998-02-24 | 2000-01-25 | 3Com Corporation | Method and system for managing subscription services with a cable modem |
-
2001
- 2001-10-30 EP EP01987326A patent/EP1348170A2/en not_active Withdrawn
- 2001-10-30 CN CNA018189474A patent/CN1474977A/en active Pending
- 2001-10-30 AU AU2002239556A patent/AU2002239556A1/en not_active Abandoned
- 2001-10-30 CA CA002428464A patent/CA2428464A1/en not_active Abandoned
- 2001-10-30 WO PCT/US2001/047184 patent/WO2002042882A2/en not_active Application Discontinuation
- 2001-10-30 KR KR10-2003-7006720A patent/KR20030048475A/en active IP Right Grant
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423492C (en) * | 2006-03-15 | 2008-10-01 | 杭州华三通信技术有限公司 | Management information base processing method |
| CN102255719A (en) * | 2010-05-17 | 2011-11-23 | 华为终端有限公司 | Method and device for realizing synchronization of cable modem |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2428464A1 (en) | 2002-05-30 |
| AU2002239556A1 (en) | 2002-06-03 |
| KR20030048475A (en) | 2003-06-19 |
| WO2002042882A2 (en) | 2002-05-30 |
| EP1348170A2 (en) | 2003-10-01 |
| WO2002042882A3 (en) | 2002-08-22 |
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