CN1081419C - Wide band multi-business digital switching system - Google Patents
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Abstract
The present invention relates to a wide band multi-business digital switching system. A plurality of subsystems called wide band multi-business digital switching subnets are mutually connected, or a plurality of wide band multi-business digital switching subnets and the existing traditional telecommunication network are mutually connected, which forms the present invention, wherein the wide band multi-business digital switching subnet is composed of a network management unit NMU, a relay unit TU, a user exchanging unit SSU and a user unit SU. The system completely adopts the transmission and exchanging technology based on groups. Multi-user statistical multiplexing physical transmission resources can be realized. The terminal application, the transmission of user lines, and the exchange adopt a digital mode. The present invention is helpful to enhance the communication quality and the communication economic benefit. The present invention is a real wide band multi-business digital communication system.
Description
The present invention relates to a kind of wide band multi-business digital switching system and method for work thereof, belong to communication technical field.
At present the switch that uses on China's telecommunications network all is a SPC telephone exchange basically, and the stored-program control exchange in the big city is generally the switch with integrated services digital network ISDN function, and its basic fundamental is based on that circuit-switched technology realizes.Because in the communication network based on circuit mode, terminal and switching technology are all fairly simple, time delay guarantees easily, is the main flow of communication network (particularly telecommunications network) in for a long time in the past based on the communication system of circuit mode therefore always.In such network, customer service is connected to switch by low speed line, and the exchanger user level is multiplexed into them on the high-speed time-division multiplex TDM bus and handles.Carry out in the process in communication, subscriber's line, exchange resource, transfer resource are all monopolized by the user.
Existing telecommunications network is mainly used in the transmission speech, referring to Fig. 1.Telephone set 1 user is connected to the user class of switch 1 by subscribers feeder.User class is finished functions such as the digital to analog conversion, voltage protection of feed to substation, voice signal.And the voiceband user signal delivered to switching matrix by inner high speed time division multiplexing tdm bus after treatment, switching matrix exchanges to TU Trunk Unit with voice signal again.When the voiceband user data are sent to switch 2 through transmission network, be sent to subsets 2 through similar process.During this transmitted data on network, need to give data terminal (as the computer among Fig. 1) to connect modulator-demodulator.Database (as the server among Fig. 1) then is connected in the telephone network by access server.Certainly also have other method can utilize telephone network transmission data, but its basic principle is consistent, the circuit that promptly will set up a circuit connection before the transmission data or utilize special line to set up between the communicating pair connects, and utilizes this to connect transmitting user data then.Such network technology has many shortcomings.
At first, exchange is that unit handles with the subscriber's line band width in physical, causes the node capacity to be difficult to improve, and general switching node has only 16K * 16K or lower exchange capacity.The exchange capacity of switching node is by the distribution of user's telephone traffic and allows certain probability of call loss design.The non-constant of the expandability of this network.Therefore network just built up several years, will bigger variation take place owing to user's telephone traffic distributes.And call loss is strengthened.
Directly or indirectly distinguish the user, make many users can't add up shared network resource, cause Internet resources to become hundred times waste, be unfavorable for handling burst service with band width in physical.In addition, user bandwidth is classification, fixing, is unfavorable for that the user dynamically adjusts shared network physical resource, is unfavorable for that the user is to the multifarious demand of business.
Subscriber's line is simulated, and transmission system is digital, and user profile is linked into switch will carry out analog to digital conversion, and user profile was carried out digital to analog conversion again before sending the user to, cause a large amount of wastings of resources.Particularly when the data terminal access network, to pass through digital to analog conversion, carry out analog to digital conversion again, leave switch and also will carry out digital to analog conversion, arrive data terminal and will carry out analog to digital conversion again, waste a large amount of internet resources to switch.In addition, the access of analog subscriber to network ' s thunder hit, aspect such as electric protection and power consumption increased many investments.User's band width in physical speed range is too narrow, can't open broadband services.
The purpose of this invention is to provide a kind of many disadvantages that can overcome existing telecommunications network, utilize present age computer technology, computer networking technology and the wide band multi-business digital switching system realized.
Another object of the present invention provides a kind of method of work of wide band multi-business digital switching system.
Wide band multi-business digital switching system of the present invention is achieved in that a kind of wide band multi-business digital switching system, it is characterized in that: it is called as subsystems interconnection of wide band multi-business numeral switched sub-networks by several or is made up of with existing traditional electrical letter net interconnection institute several wide band multi-business numeral switched sub-networks, wherein the digital switched sub-networks of wide band multi-business by SSU subscriber switching unit SSU with formed with its network management unit NMU, TU Trunk Unit TU that is connected respectively, several subscriber units SU; Described SSU subscriber switching unit SSU is based on the fast ethernet switch of layer 2 or layer 3 switching technology; Described network management unit NMU is made up of subscriber management server, subnet management server and call signaling processing server; Described TU Trunk Unit TU is used for connecting several subnets or connects plug-in card subnet and conventional telecommunications net, that be positioned at SSU subscriber switching unit or SSU subscriber switching unit arrives the interworking unit IWF of other network; Described subscriber unit SU is made of several wide band multi-business digital intelligents terminal TE and Ethernet connection device, and existing network host also can be used as the general user and is linked among the subscriber unit SU.
Described subscriber unit SU has following several physical connection form: utilize coaxial cable directly to form network bus, and extend its topped scope by repeater; Utilize hub to realize concentrated user's connection, can directly use the twisted-pair feeder interface this moment; Coaxial cable interface and twisted-pair feeder interface can mix use as the case may be or use respectively.
Voiceband user packet switching, voiceband user that described SSU subscriber switching unit SSU mainly finishes between the different subscriber units SU are grouped into the exchange to network management unit NMU of exchange, customer management information and the signaling information of TU Trunk Unit TU.
Described TU Trunk Unit TU can be divided into two big classes: the TU Trunk Unit and the TU Trunk Unit that is used to be connected other similar subnet or Internet that are used to connect telecommunications network.
Described subscriber management server mainly has following function: user's registration, user validation authentication, the renewal of user performance characteristic Data Dynamic, user test and monitoring and user address analysis.
Described subnet management server mainly has following function: networking traffic statistics and analysis, charging, SSU subscriber switching unit routing scheduling and configuration, SSU subscriber switching unit and management of terminal kind equipment and testing user equipment.
Described call signaling processing server mainly has following function: call request is accepted, call proceeding processing, call state monitor and call data are collected.
Wherein the voice data passage utilizes special-purpose TCP/IP port numbers transmit voice data, and the control and management passage utilizes special-purpose TCP/IP port numbers transmission control and management information.
The address resolution that subscriber management server in the network management unit is finished includes: called subscriber's personal number is to the address resolution of this subscriber directory number, called subscriber's personal domain or individual subscriber number are to the address resolution of its IP address, caller IP address or MAC Address are to the address resolution of its telephone number, and rear side phone number is to the address resolution of its IP address.
The method of work of wide band multi-business digital switching system of the present invention is achieved in that a kind of method of work of wide band multi-business digital switching system, it is characterized in that: subscription authentication realizes by authentication arithmetic; The step of subscription authentication algorithm is as follows: network management unit produces a random number, in the authentication command messages, send the user to, user cipher does not transmit between user and network management unit, terminal and network management unit difference be counter of user storage for this reason, the random number that utilization is received, by counter and the common compute authentication result of user cipher, authentication success then counter is upgraded.
The another kind of method that disabled user's intrusion is taken precautions against by system is: taken out source IP address and the purpose IP address that is included in the IP bag by SSU subscriber switching unit, and with the IP address of buffer memory to comparing, it is right to have only through the IP address of buffer memory, and promptly the communication process through the service access authentication could obtain service.
Network management unit monitors the IP address utilization of terminal in the subnet by SSU subscriber switching unit, if during the corresponding different MAC Address of identical ip addresses, network management unit should initiatively be initiated the MAC Address that subscription authentication obtains validated user, and abandons the IP bag that the disabled user sends.
Network management unit also will judge whether user's service is accepted according to User Priority and current sub network flow situation after judging that the user is whether legal.
System is by the method for network management unit NMC to terminal transmission test post, and the identification user plucks, hook state.
Major advantage of the present invention is: in the communication network of forming, adopt packet-based transmission and switching technology fully in subnet of the present invention or by subnet of the present invention interconnection, be convenient to multi-user's statistic multiplexing physical transfer resource.Particularly the user can fixedly not take specific physical resource separately in communication process, has greatly improved the utilance of transmission medium, can handle burst service effectively.
Switching node is handled and exchanging user data in the frame mode, thereby realize the statistic multiplexing of Internet resources, the unit interface rate of switching node is more than 10Mbps, make things convenient for node to realize big capacity, can use gigabit in present hardware-switch technology (as asynchronous transfer mode ATM, Gigabit Ethernet technology, the light switching technology etc.) realization than in addition go up the switching node of billion ratio.And the switching node capacity can dynamically expand, and the new exchange resource that expands can be used by original user.
Digital form is all adopted in transmission and exchange from the terminal applies to the subscribers feeder; saved complicated analog subscriber level; make digitization system further extend to user side; help to improve communication quality and communication economy benefit, and can save great amount of investment at aspects such as anti-tampering, anti-thunderbolt, power consumption and protective circuits.Whole system can utilize ready-made digit chip and ripe computer technology to realize having the very high ratio of performance to price.
Can provide 0 to 10Mbps even higher stepless bandwidth, can adapt to multiple business such as speech, data query, video request program, and the user can dynamically adjust shared network bandwidth resources according to the network congestion situation.Realize real digitlization and broadband.
The compatible TCP/IP net of energy adapts to current development communication technologies.Reduce the investment of user on the Modem kind equipment.
Can realize the intellectuality of communication system by the terminal and the webserver jointly, comprise that the user searches, subscription authentication, service logic definition, user identity identification and take precautions against disabled user etc., thereby realize intelligent network truly.
Further introduce system of the present invention below in conjunction with accompanying drawing and form structure, operation principle and its main rules:
Fig. 1 is existing telephone switching system schematic diagram;
Fig. 2 is that the system of wide band multi-business digital switching system of the present invention forms structural representation;
Fig. 3 is that the subscriber unit system in the system of the present invention is formed schematic diagram;
Fig. 4 is that the present invention directly utilizes mac frame encapsulation speech packet schematic diagram;
Fig. 5 is that the present invention utilizes IP to seal dress speech packet schematic diagram;
Fig. 6 is the schematic diagram of speech channel and subscriber control information passage in the system of the present invention.
Referring to Fig. 2, the present invention is a kind of wide band multi-business digital switching network, it is called as the subsystem interconnection of wide band multi-business numeral switched sub-networks by several or is made up of several wide band multi-business numeral switched sub-networks and existing traditional electrical letter net PSTN/INTRANET interconnection, and wherein wide band multi-business numeral switched sub-networks is made up of network management unit NMU, TU Trunk Unit TU, SSU subscriber switching unit SSU and subscriber unit SU.
Wherein subscriber unit SU is made of several wide band multi-business digital intelligents terminal TE and Ethernet connection device, family as the wide band multi-business digital intelligent terminal TE of the elemental user unit in the system of the present invention can be computer, wide band multi-business digital intelligent telephone set or other digital communication equipments, and existing network host also can be used as the general user and is linked among the subscriber unit SU.Can be provided with 60 wide band multi-business digital intelligent terminal TE in the Preliminary design subscriber unit SU now, wherein can allow 12 digitlization intelligent terminal TE to carry out bi-directional speech communication simultaneously.
Referring to Fig. 3, subscriber unit SU can adopt different networking modes according to the characteristic distributions of user terminal.Subscriber unit SU has following several physical connection form: utilizes coaxial cable directly to form network bus, topped scope can be extended to the km distance, can be used to provide the connection between the building by repeater, or the connection between the dispersion user.Utilize hub HUB can realize concentrated user's connection easily, as the connection of inside, building, can directly use the twisted-pair feeder interface this moment; Coaxial cable interface and twisted-pair feeder interface can mix use as the case may be or use respectively.
SSU subscriber switching unit SSU of the present invention is based on the fast ethernet switch of layer 2 or layer 3 switching technology.Its voiceband user packet switching, voiceband user of mainly finishing between the different subscriber units SU is grouped into the exchange to network management unit NMU of exchange, customer management information and the signaling information of TU Trunk Unit TU.SSU subscriber switching unit directly exchanges the MAC bag, message such as speech packet, customer management information, signaling are transparent in SSU subscriber switching unit, SSU subscriber switching unit SSU is responsible for monitoring the distribution situation of these service traffics in subnet, its major function is: MAC Address self study, MAC bag addressing and exchange and traffic monitor.
TU Trunk Unit TU of the present invention is used to connect a plurality of subnets or subnet and conventional telecommunications net (as: public switched telephone network PSTN, Digital Data Net DDN etc.).According to the practical situations difference, TU Trunk Unit can be divided into two big classes: a kind ofly be used to connect telecommunications network, another kind is used to connect the TU Trunk Unit of other similar subnet or Internet.This TU Trunk Unit TU can be plug-in card among the SSU subscriber switching unit SSU or the SSU subscriber switching unit SSU interworking unit IWF to other network.
The TU Trunk Unit that is used for connecting telecommunications network is that the voice data with speech packet inserts among the time slot TS of PCM transmission channel, and handles and adjust functions such as speech time-delay and shake, speech clock recovery.Can adopt similar ATM circuit emulation technology, remove packets headers, take out the voice data and the speech clock that reduces.The interface that this TU Trunk Unit adopts can be the E1 interface, because the interoffice trunk on the present telephone network mostly is this kind interface.The use of can hiving off of E1 interface as the V5.2 interface, also can be used separately.The TU Trunk Unit planted agent who is used to connect telecommunications network comprises the Signaling System Number 7 processing module.
The TU Trunk Unit that connects other similar subnet or Internet should be used the broadband high-speed interface that widely uses at present, as 100M Ethernet interface, Gigabit Ethernet interface, frame relay fr interface, asynchronous transfer mode atm interface, synchronous digital multiple connection SDH interface or Narrowband Integrated Services Digital Network primary rate 30B+D interface.The distance can adopt Ethernet interface in short-term, because of price more relatively cheap; During distance, should adopt the telecommunications network interface, at this moment, need network interworking equipment to be set, can save the transmission equipment investment cost like this on border, subnet two ends.
Network management unit NMU of the present invention is made up of subscriber management server, subnet management server and call signaling processing server.Above-mentioned these servers can be realized in a PC or work station, also can realize in a plurality of PCs or work station.According to subnet scale difference, the performance of network management unit NMU can flexible configuration, can also dynamic update.Wherein subscriber management server is mainly finished following function:
User's registration: when the user proposed professional application, the network operator should increase this user performance characteristic and describe in the database of network management unit NMU.User performance characteristic is described and is comprised parameters such as subscriber directory number, individual subscriber domain name, individual subscriber number, IP address, password, business need.Wherein, business need comprises User Priority and COS.
At user terminal when network is initiated professional application, be responsible for user's legitimacy is carried out authentication by subscriber management server, promptly the legitimacy of any professional application of user is decision making, determine whether this user has the professional qualification of applying for according to the traffic performance parameter of user's registration.And cache user terminal MAC Address.
Dynamically updating of user performance characteristic data: subscriber management server can be made amendment to parameters such as its password, service features at user's run duration.
User test in the subnet and monitoring: comprise that the user plucks, hook state, subscriber connection line state, user terminal connection status.
User address analysis: the IP address of promptly searching the called subscriber according to CSI called subscriber identification information (as called subscriber's telephone number, individual subscriber domain name, individual subscriber number etc.), or arrival called subscriber's Port IP address, caller IP address or MAC Address are to the address resolution of its telephone number, and rear side phone number is to the address resolution of its IP address.
Wherein the call signaling processing server is mainly finished following function:
Call request is accepted: the call signaling processing server is responsible for the process user connection and is set up solicitation message, judges according to service feature, the network traffic condition of user's registration whether the customer call application is accepted.
Call proceeding is handled: determine how to continue this calling according to called user information, and generation, processing signaling message.
Call state monitors and call data are collected.
Wherein the subnet management server is mainly finished following function: networking traffic statistics and analysis, and service quality detects; Charge and the metering data maintenance; SSU subscriber switching unit routing scheduling and configuration; Equipment controles such as SSU subscriber switching unit SSU and TU Trunk Unit TU (as: equipment alarm demonstration, record and processing etc.); And testing user equipment.
Referring to Fig. 4 and Fig. 5, introduce the operation principle and the main rules thereof of system of the present invention below:
The generation of the speech packet of system of the present invention at first is voice signal to be passed through processing such as acoustic-electric conversion, pcm encoder at terminal inner with encapsulation, is encoded into the speech data successive bits stream of 64Kbps.After again this speech data being partitioned into the voice data packet of appropriate length.Could on Ethernet, transmit.At this moment, packets of voice data will be encapsulated in MAC bag or the IP bag.Fig. 4 has provided the principle of packets of voice data encapsulation in the MAC bag, and Fig. 5 has provided the principle of packets of voice data encapsulation in the IP bag.Cross over when subnet transmits or multiple business coexists in consolidated network, method for packing shown in Figure 5 is adopted in suggestion.Come the transporting speech grouping so that utilize special-purpose TCP/IP port numbers.
Speech packet is to produce and be encapsulated in the IP bag by terminal, and the IP of voice-over grouping wraps in when transmitting in the network of being made up of system of the present invention and adopts the packet udp protocol, and is insensitive because speech is lost data, to time delay and time delay jitter-sensitive.When data-bag lost takes place, receive words one side's terminal and should initiatively insert noise signal.
When receipts words side was black phone, the 1P of voice-over grouping wrapped the TU Trunk Unit that connects telecommunications network in the subnet that will be sent to the calling party place.If the subnet at calling party place does not connect the TU Trunk Unit of telecommunications network, the IP bag of voice-over grouping will be sent in the nearest subnet that the TU Trunk Unit that connects telecommunications network is arranged, and be delivered in its TU Trunk Unit by this subnet again.Voice data is resumed in the TU Trunk Unit that connects telecommunications network, and is inserted in the time slot of trunk line.When the generation speech packet is lost, be responsible for inserting noise by this TU Trunk Unit.The TU Trunk Unit that connects telecommunications network should be extracted clock from coupled legacy phone switch or transmission equipment, for use in recover the voice service clock from the IP bag of voice-over grouping.
Speech packet is to produce and be encapsulated in the IP bag by terminal, adopts the packet udp protocol when IP of voice-over grouping wraps transmission in the network that system of the present invention forms, and is insensitive because speech is lost data, to time delay and time delay jitter-sensitive.When data-bag lost takes place, receive words one side's terminal and should initiatively insert noise signal.
When receipts words side was black phone, the IP of voice-over grouping wrapped the TU Trunk Unit that connects telecommunications network in the subnet that will be sent to the calling party place.If the subnet at calling party place does not connect the TU Trunk Unit of telecommunications network, the IP bag of voice-over grouping will be sent in the nearest subnet that the TU Trunk Unit that connects telecommunications network is arranged, and be delivered in its TU Trunk Unit by this subnet again.Voice data is resumed in the TU Trunk Unit that connects telecommunications network, and is inserted in the time slot of trunk line.When the generation speech packet was lost, this TU Trunk Unit was responsible for inserting noise.The TU Trunk Unit that connects telecommunications network should be extracted clock and be used for recovering the voice service clock from the IP bag of voice-over grouping from the legacy phone switch that is attached thereto or transmission equipment.
Referring to the schematic diagram of control and management channel in the system of the present invention shown in Figure 6 and voice data channel, heavy line is represented the voiceband user data channel among the figure, and dotted line is represented user's control and management channel.The voiceband user data channel is used for the transmission user speech packet, and data link layer is used the mac frame form.Network transceivers in the user terminal is according to the MAC Address transceive data.Upper layer software (applications) takes out the speech packet that is encapsulated in the MAC bag and handles.As shown in the figure, the speech channel of same subscriber unit inside is without SSU subscriber switching unit, also without TU Trunk Unit; Speech channel in the different subscriber units of same subnet inside will pass through SSU subscriber switching unit, but without TU Trunk Unit; Speech channel between the different sub-network had both passed through SSU subscriber switching unit, also passed through TU Trunk Unit.The TCP/IP port numbers of voice data channel usage special use is come the transporting speech grouping.
The control and management channel will take one or two special-purpose TCP/IP port numbers, is used to transmit user's control and management information and signaling information.Network management unit and user terminal constitute the Server/Client structure.
When using user's off-hook of terminal of the present invention, user terminal will send call request message to network management unit NMU, and call request message should comprise parameters such as calling subscriber's identification number and password.Whether network management unit NMU trespasses according to these users of parameter decision such as IP address that the user provides, and network management unit judges according to network traffic condition information of being grasped and customer service priority whether this customer service application is accepted then.Last network management unit NMU sends calling to the calling subscriber and is accepted or be rejected message.Calling terminal sends corresponding warning tone according to this message to the user.
The TU Trunk Unit of connection telecommunications network can be received the call request from black phone.The call request from the traditional electrical phone network can be accepted in Signaling System Number 7 unit in the TU Trunk Unit of connection telecommunications network, can obtain called subscriber's identification information according to signaling message network management unit NMU.Again according to the configuration of this state of user information, service parameter, rear subscriber number, and factor such as flow distribution situation judges to call out whether be accepted in the comprehensive subnet.And transmit to PSTN side according to this judged result and to reply signaling information accordingly.
In the system that the present invention forms, the called subscriber can use multi-form user totem informations such as subscriber directory number, individual subscriber domain name or individual subscriber number.The user only need dial any in the above-mentioned number when call peer.Network management unit NMU can finish address resolution automatically.Address resolution of the present invention has following several situation:
Black phone is during as the called subscriber, and the individual subscriber number is to the address resolution of telephone number: network management unit NMU searches called subscriber's telephone number in distributed network data base according to called subscriber's personal number.Telephone number according to the called subscriber is selected suitable route, makes a call to the PSTN side.
Black phone is during as the called subscriber, and IP address or MAC Address are to the address resolution of telephone number: when needs transmit rear subscriber number, and the telephone number that network management unit NMU also will search the calling subscriber according to calling subscriber's IP address or MAC Address.When the PSTN side sends signaling message, send this number to the PSTN side.
Black phone is during as the calling subscriber, and the Signaling System Number 7 among the TU Trunk Unit TU is responsible for signaling protocol and is handled.Call out in the time of can being accepted if network management unit is thought, it can be according to this user's IP address of telephone number searching of called subscriber.After set up calling out, network management unit can dispose TU Trunk Unit and will call out thus and receive, send to this IP address from the speech successive bits stream of PSTN side.
When caller and called users all is a broadband multi-purpose digital intelligent telephone in the system of the present invention, called subscriber's personal domain or individual subscriber number are to the address resolution procedure of IP address: the IP address that network management unit is searched the called subscriber according to called subscriber's personal domain or personal number, and sending this information to calling subscriber, the calling subscriber sends speech packet according to called subscriber's IP address.
When being intelligent terminal of the present invention, the user utilizes special-purpose address resolution message to send the address resolution solicitation message to subscriber management server when making a call when called.In the address resolution solicitation message, include: the E.164 subscriber directory number of called phone, individual subscriber domain name or individual subscriber number.The address resolution solicitation message is as a kind of call-signaling message, and the special-purpose TCP/IP port numbers of utilizing call-signaling message to take is transferred to subscriber management server.Subscriber management server carries out the IP address that called phone is searched in address resolution according to the identification information (as E.164 subscriber directory number, individual subscriber domain name or the individual subscriber number of called phone) of called phone.If inquire the IP address of called phone, subscriber management server will send the address resolution response of confirming to main dialing telephone, and comprise the IP address of called phone in response.If can't obtain the IP address of called phone, subscriber management server will send the refusal response to main dialing telephone.Main dialing telephone is according to the IP address of the called phone that is resolved to, after speech packet transmission in, be destination address with this IP address, take the TCP/IP port numbers of speech packet special use, the IP that sends voice-over to called phone wraps.Address resolution message also can be used as the part of call setup solicitation message and sends to subscriber management server.In the case, main dialing telephone can directly send speech packet behind the IP address that obtains called phone.Subscriber management server will consider that the subnet flow information takes a decision as to whether the main dialing telephone user service is provided when sending the address resolution response to main dialing telephone.
When being conventional telephone set, the user will utilize special-purpose address resolution message to send the address resolution solicitation message to subscriber management server when making a call when called.The E.164 subscriber directory number that in the address resolution solicitation message, comprises called phone.The address resolution solicitation message is utilized call-signaling message to take special-purpose TCP/IP port numbers and is transferred to subscriber management server as a kind of call-signaling message.Subscriber management server is according to the E.164 subscriber directory number of called phone, find public telephone switching network PSTN side the IP address of first trunking port of process, and this IP address sent to main dialing telephone as the address resolution response.After speech packet transmit, as destination address, the TCP/IP port numbers that takies the speech packet special use sends the IP bag of voice-over grouping to main dialing telephone with this IP address.The part that same address resolution message also can be used as the call setup solicitation message sends to subscriber management server.In the case, main dialing telephone can directly send speech packet information after obtaining called phone IP address.Subscriber management server will be considered the subnet flow information when sending the address resolution response to main dialing telephone, and after setting up the successful connection of PSTN side, sends the address resolution response of determining to main dialing telephone again.
In the system that the present invention forms, both call sides can all be a broadband multi-purpose digital intelligent telephone, and it is the conventional telephone set terminal that a side also can be arranged.It is as follows that it connects situation about setting up with deletion:
When a side was conventional telephone set, PSTN side call treatment was followed Signaling System Number 7.TU Trunk Unit TU can regard remote end module, access module or the end office (EO) of PSTN as.Connect in the subnet of the present invention to set up and show as TU Trunk Unit TU to the IP of appointment terminal, the IP bag of transmission voice-over data on specific TCP/IP port numbers.
When both sides are broadband multi-purpose digital intelligent telephones, connect to set up to show as both call sides all to the IP of appointment terminal, on specific TCP/IP port numbers, use the IP bag that udp protocol sends the voice-over data.
Terminal sends the connection tear down message automatically to network management unit during end of calling, and the metered call descriptor is taken use for note simultaneously.
When the user makes a call, need serve to the network application.The user needs authentication in the application service process, has only validated user ability address acquisition analysis service.This user that network management unit NMU control SSU subscriber switching unit SSU buffer memory and parsing obtain and called subscriber's IP address thereof are right.When IP bag was input to SSU subscriber switching unit SSU, SSU subscriber switching unit was taken out source IP address and the purpose IP address that is included in this IP bag, and with the IP address of buffer memory to comparing.It is right to have only through the IP address of buffer memory, and promptly the communication process through the service access authentication could obtain service.The IP bag of the communication process of process authentication will not be dropped.
Subscription authentication realizes by authentication arithmetic.The subscription authentication algorithm principle is as follows: the user should arrange initial password K with service supplier when application is professional, this initial password K leaves in network management unit and the user terminal, and this initial password does not transmit between user and network management unit in authentication process.Can protect user cipher like this.Counter Cu of storage in terminal, also counter Cn of user storage for this reason in network management unit, the initial value of two counter Cu and Cn is zero.Through once successful authentication, this user's who stores in the counter Cu of terminal storage and the network management unit counter Cn adds 1 respectively.When counter during greater than a certain maximum, then counter returns zero.When authentication began, network management unit produced a random number R, utilized random number R and password K, and counter Cn calculates authenticating result and is cached in the network management unit.Network management unit sends the authentication order to the user, comprises random number R in this command messages.After user terminal is received the authentication order, utilize the random number R of receiving, counter Cu and user cipher K compute authentication result, the user only transmits this authenticating result and refresh counter Cu to network management unit in Authentication Response.Network management unit is compared the authenticating result received with the local authenticating result of calculating, if identical then authentication success, network management unit refresh counter Cn.Otherwise be failed authentication.
Network management unit also monitors the IP address utilization of terminal in the subnet by SSU subscriber switching unit, if during the corresponding different MAC Address of identical ip addresses, network management unit NMU should initiatively initiate the MAC Address that subscription authentication obtains validated user, and abandons the IP bag that the disabled user sends.
In addition, can close some TCP/IP port numbers among the SSU subscriber switching unit SSU by network management unit NMU.The IP bag that illegal TCP/IP port numbers is carried will be dropped.Network management unit NMC can also be when needed sends test post to terminal, and user terminal is wanted response to network administrative unit NMC test post, and reports oneself pluck, hook state.
Claims (14)
1. wide band multi-business digital switching system, it is characterized in that: it is called as subsystems interconnection of wide band multi-business numeral switched sub-networks by several or is made up of with existing traditional electrical letter net interconnection institute several wide band multi-business numeral switched sub-networks, wherein the digital switched sub-networks of wide band multi-business by SSU subscriber switching unit SSU with formed with its network management unit NMU, TU Trunk Unit TU that is connected respectively, several subscriber units SU; Described SSU subscriber switching unit SSU is based on the fast ethernet switch of layer 2 or layer 3 switching technology; Described network management unit NMU is made up of subscriber management server, subnet management server and call signaling processing server; Described TU Trunk Unit TU is used for connecting several subnets or connects plug-in card subnet and conventional telecommunications net, that be positioned at SSU subscriber switching unit or SSU subscriber switching unit arrives the interworking unit IWF of other network; Described subscriber unit SU is made of several wide band multi-business digital intelligents terminal TE and Ethernet connection device, and existing network host also can be used as the general user and is linked among the subscriber unit SU.
2. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: described subscriber unit SU has following several physical connection form: utilize coaxial cable directly to form network bus, and extend its topped scope by repeater; Utilize hub to realize concentrated user's connection, can directly use the twisted-pair feeder interface this moment; Coaxial cable interface and twisted-pair feeder interface can mix use as the case may be or use respectively.
3. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: voiceband user packet switching, voiceband user that described SSU subscriber switching unit SSU mainly finishes between the different subscriber units SU are grouped into the exchange to network management unit NMU of exchange, customer management information and the signaling information of TU Trunk Unit TU.
4. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: described TU Trunk Unit TU can be divided into two big classes: the TU Trunk Unit and the TU Trunk Unit that is used to be connected other similar subnet or Internet that are used to connect telecommunications network.
5. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: described subscriber management server mainly has following function: user's registration, user validation authentication, the renewal of user performance characteristic Data Dynamic, user test and monitoring and user address analysis.
6. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: described subnet management server mainly has following function: networking traffic statistics and analysis, charging, SSU subscriber switching unit routing scheduling and configuration, SSU subscriber switching unit and management of terminal kind equipment and testing user equipment.
7. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: described call signaling processing server mainly has following function: call request is accepted, call proceeding processing, call state monitor and call data are collected.
8. wide band multi-business digital switching system as claimed in claim 1 is characterized in that: wherein the voice data passage utilizes special-purpose TCP/IP port numbers transmit voice data, and the control and management passage utilizes special-purpose TCP/IP port numbers transmission control and management information.
9. wide band multi-business digital switching system as claimed in claim 1, it is characterized in that: the address resolution that the subscriber management server in the network management unit is finished includes: called subscriber's personal number is to the address resolution of this subscriber directory number, called subscriber's personal domain or individual subscriber number are to the address resolution of its IP address, caller IP address or MAC Address are to the address resolution of its telephone number, and rear side phone number is to the address resolution of its IP address.
10. the method for work of a wide band multi-business digital switching system, it is characterized in that: subscription authentication realizes by authentication arithmetic; The step of subscription authentication algorithm is as follows: network management unit produces a random number, in the authentication command messages, send the user to, user cipher does not transmit between user and network management unit, terminal and network management unit difference be counter of user storage for this reason, the random number that utilization is received, by counter and the common compute authentication result of user cipher, authentication success then counter is upgraded.
11. the method for work of wide band multi-business digital switching system as claimed in claim 10, it is characterized in that: the another kind of method that disabled user's intrusion is taken precautions against by system is: taken out source IP address and the purpose IP address that is included in the IP bag by SSU subscriber switching unit, and with the IP address of buffer memory to comparing, it is right to have only through the IP address of buffer memory, and promptly the communication process through the service access authentication could obtain service.
12. the method for work of wide band multi-business digital switching system as claimed in claim 10, it is characterized in that: network management unit monitors the IP address utilization of terminal in the subnet by SSU subscriber switching unit, if during the corresponding different MAC Address of identical ip addresses, network management unit should initiatively be initiated the MAC Address that subscription authentication obtains validated user, and abandons the IP bag that the disabled user sends.
13. the method for work of wide band multi-business digital switching system as claimed in claim 10 is characterized in that: network management unit also will judge whether user's service is accepted according to User Priority and current sub network flow situation after judging that the user is whether legal.
14. the method for work of wide band multi-business digital switching system as claimed in claim 10 is characterized in that: system is by the method for network management unit NMC to terminal transmission test post, and the identification user plucks, hook state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105556 CN1081419C (en) | 1999-04-12 | 1999-04-12 | Wide band multi-business digital switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105556 CN1081419C (en) | 1999-04-12 | 1999-04-12 | Wide band multi-business digital switching system |
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| CN1235455A CN1235455A (en) | 1999-11-17 |
| CN1081419C true CN1081419C (en) | 2002-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99105556 Expired - Fee Related CN1081419C (en) | 1999-04-12 | 1999-04-12 | Wide band multi-business digital switching system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100358317C (en) * | 2002-09-09 | 2007-12-26 | 中国科学院软件研究所 | Community broad band Integrated service network system |
| CN110138418B (en) * | 2019-05-30 | 2022-04-08 | 磐基技术有限公司 | Wired communication device supporting simultaneous access of multiple users |
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1999
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| CN1235455A (en) | 1999-11-17 |
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