CN101159751B - Method and device of transmitting time division multiplex service through IP switch network - Google Patents
Method and device of transmitting time division multiplex service through IP switch network Download PDFInfo
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Abstract
The invention discloses a method and a device for transmitting time division multiplexing service through an IP exchange network. The method comprises bearing TDM signals by using an IP pack, packaging the TDM signals into an IP net charge in a TDMoIP frame format, and transmitting to a packet switching network; and receiving the TDMoIP frame from the packet switching network, and carrying out corresponding service after extracting the TDM signals from the TDMoIP frame. The device comprises a TDMoIP frame organizing module, a transmitting module, a forwarding table searching module, a MAC/GMAC device, a receiving module, and a TDMoIP frame decomposing module, and may also comprises a TDM small switching module, a multiplexing module and a demultiplexing module. The invention achieves TDM signal package by using the IP pack so as to achieve more convenient and fast network capacity expansion, and the time gap interleaving multiplexing technique can improve the length of net charges of the TDMoIP frame so as to reduce the cost of pack-front catchword, MAC head and IP head of the Ethernet accordingly and improve the utilization rate of the network bandwidth.
Description
Technical field
The invention belongs to the voice communications versus data communications technical field, particularly transmit the professional method and apparatus of TDM (Time-division multiplexing, time division multiplexing) by the IP switching network.
Background technology
Current, telecommunication technology develops to " all-IP " direction.Compare with traditional TDM network, the networking of IP switching network is simple, has the advantage on the cost.
In the all-IP process, relate to support, the support of TDM had several different methods existing TDM network:
Method one: in network, keep two cover switching networks, the circuit kit territory switching network and a cover packet switching network, if relate to IP operation, the TDM signal that just terminates is converted into the IP bag, exchanges by packet switching network; If pure TDM business is just directly walked the circuit domain switching network.
Method two: in network,, all TDM voice-and-datas are converted to real IP wrap and handle directly with TDM signal termination.
Method three: in the tunnel mode TDM signal is loaded in the IP bag, handles through from the IP bag, taking out the TDM signal again after the packet switching.
Method one need keep two cover switching networks in network: the circuit kit territory switching network and a cover packet switching network, and the switching backplane design is complicated, and cost is higher comparatively speaking; Method two need add special processor the TDM conversion of signals is become the IP message on interface board, except using general processor, also will use digital signal processor or network processing unit to realize the code stream conversion on interface board, and cost is also very high; Method three relative interface boards and switching backplane design are all very simple, and it directly is encapsulated in the TDM signal in the IP bag, delivers to service processing board through after the packet switching, continue to handle behind the extraction TDM service signal on service processing board from the IP bag.In this method, IP bag as same tunnel, TDM signal are encapsulated in the IP bag, will be through complicated encoding and decoding conversion unlike method two.
In existing patent, Chinese patent application CN200410058487 has described a kind of apparatus and method that transmit in the mac frame (TDM over Packet-TOP frame) that the TDM signal is encapsulated in.Fig. 1 is a TOP frame format schematic diagram, and it is encapsulated in the continuous m frame of a TDM link in the TOP frame, and a time slot is represented in a segmentation of TOP frame.E1 link for example, frame data have 32 time slots, and then the segments of TOP frame (seg) just is 32, if the length of one section seg is 4, it represents that continuous 4 frames are encapsulated in a TOP frame.Because synchronizing network has 8000 frame data each second, be 0.5ms the blanking time that then sends 4 frames, and payload was 128 bytes when the payload that sends for each TOP frame of E1 link was 4 E1 frames.
Method for packing described in this patent application has been done very large adjustment to the frame sequential and the time-slot sequence of TDM frame, when reality realizes, is not a kind of high-efficiency method.The another one shortcoming is to have adopted the TDM signal to be encapsulated into method in MAC (Media Access Control, the media interviews control) frame, though this method is simple, is unfavorable for the expansion of network, and is very inconvenient in the network design of reality.
Summary of the invention
The technical problem to be solved in the present invention is the defective that overcomes preceding method and device existence, proposes a kind of method and apparatus by IP switching network transmitting time division multiplex service.This method and apparatus does not need the time slot of TDM signal is done adjustment on a large scale, can encapsulate the TDM signal more efficiently, and convenient when network design, dilatation.
For solving the problems of the technologies described above, the method for passing through IP switching network transmitting time division multiplex service that the present invention proposes is as follows:
The first step according to TDMoIP frame format (TDM over IP), is encapsulated into the TDMoIP frame with the TDM signal;
In second step, the TDMoIP frame that encapsulation is finished sends to packet switching network;
In the 3rd step, receive the TDMoIP frame from packet switching network;
In the 4th step, from the TDMoIP frame, send to Service Processing Module behind the extraction TDM signal and carry out corresponding service processing with TDM interface;
Described TDMoIP frame comprises MAC head, IP head and some TDM frames, can also optionally comprise the UDP head.Each TDM frame is made of link No., frame number and TDM time slot payload in the TDMoIP frame.
The concrete steps of encapsulation TDMoIP frame are as follows in the above-mentioned first step:
(1) the TDM signal is encapsulated in the IP payload according to the TDMoIP frame format;
(2) add from transmit the IP address and the MAC Address of searching the purpose business board that the notebook data frame that obtains will send according to the TDM link No.;
(3) add source IP address and source MAC;
(4) finish the encapsulation of TDMoIP frame, it is to be sent to give sending module etc.
The concrete steps of extracting the TDM signal in above-mentioned the 4th step from the TDMoIP frame are as follows:
(1) peels the MAC head and the IP header overhead of TDMoIP frame off,, also peel off in the lump if the TDMoIP frame comprises the UDP head;
(2) the frame head information of proposition TDM frame;
(3) the TDM frame payload that will remove frame head information is given the corresponding service processing module.
Described packet switching network can be an Ethernet switch, also can be router.
In order to make full use of the bandwidth of IP switching network, can also adopt the TDM time slot to interleave conversion multiplexing and demultiplexing technology realization TDM low speed signal and high speed signal in the said method:
Increased a multiplexing step before the above-mentioned first step, will treat that earlier each multiplexing frame TDM signal is buffered in the memory, the method that adopts time slot to interleave again is multi-path low speed TDM signal multiplexing one tunnel high speed TDM signal; Extracting the TDM signal from the TDMoIP frame after, above-mentioned the 4th step increases a demultiplexing step, is one tunnel high speed TDM signal demultiplexing multi-path low speed TDM signal, again low speed TDM signal is sent to the Service Processing Module with TDM interface and finishes relevant Business Processing.For this reason, each the TDM frame in the described TDMoIP frame also should comprise link No. information, is used for identifying TDM time slot residing link position before multiplexing of this TDM frame.
In order to make resource or timeslot scheduling more convenient, reach with any one any one time slot of going on the TDM link adjust to out as required to the purpose of any one time slot of any TDM link, can also increase a time gas exchange step before above-mentioned multiplexing step, the method that adopts time slot to interleave is carried out time gas exchange to the TDM signal and is handled; Correspondingly, also increase a time gas exchange step after above-mentioned demultiplexing step, the method that adopts time slot to interleave is carried out time gas exchange to the TDM signal and is handled.
For realizing said method, the device that passes through IP switching network transmitting time division multiplex service that the present invention proposes comprises:
TDMoIP framing module is used for the TDM signal is encapsulated into the TDMoIP frame according to the TDMoIP frame format, and gives sending module the TDMoIP frame;
Sending module, be used to finish parallel-to-serial conversion work, the TDMoIP frame is sent on the packet switching network from MAC/GMAC (Gigabit Ethemet MAC, kilomega network media interviews control) device by sending FIFO (First In First Out, fifo buffer);
Transmit and search module, when TDM signal and TDMoIP frame are changed mutually, be used for searching IP, MAC Address from transmitting, and from transmit, search the TDM link No. according to IP, MAC Address according to the TDM link No.;
The MAC/GMAC device is used for the TDMoIP frame is sent to packet switching network, and receives the TDMoIP frame from packet switching network;
Receiver module is used to finish string and conversion work, receives the TDMoIP frame by receiving FIFO, and complete TDMoIP frame is sent to TDMoIP separates frame module;
TDMoIP separates frame module, is used for realizing extracting the TDM frame from the IP payload, and TDM frame payload is sent out this veneer from transmission interface.
Described TDMoIP framing module at first is encapsulated in tdm data in the IP payload according to the TDMoIP frame format, add then according to transmitting and search module is searched the purpose business board that the notebook data frame that obtains will send from transmit IP address and MAC Address, add again and go up source IP and source MAC, give sending module with the TDMoIP frame at last.
Described TDMoIP separates MAC head and the IP header overhead that frame module is at first peeled the TDMoIP frame off, proposes the frame head information of TDM frame then, gives corresponding processing module with TDM frame payload at last.
In order to make full use of the bandwidth of IP switching network, the present invention also adopts the TDM time slot to interleave the conversion of multiplex technique and demultiplexing technology realization TDM low speed signal and high speed signal.Simultaneously, in order to make resource or timeslot scheduling more convenient, the present invention also carries out time gas exchange to low speed TDM signal and handles.For this reason, apparatus of the present invention also comprise:
The little Switching Module of TDM, be used for before the up direction multiplexing process, after the down direction demultiplexing handles, the TDM chain time gap is exchanged processing, with any one any one time slot of going on the TDM link adjust to out as required to any one time slot of any TDM link;
Multiplexing module, the multi-path low speed TDM link signal that is used for handling through the little Switching Module of TDM is multiplexed into one tunnel high speed TDM link signal, and the high speed TDM link signal after multiplexing is sent into TDMoIP framing resume module, the method that multiplexing employing time slot interleaves;
Demultiplexing module, being used for TDMoIP is separated the high speed TDM link signal demultiplexing that frame module parses is multi-path low speed TDM link signal, and the low speed TDM link signal behind the demultiplexing is sent into the little Switching Module of TDM and handled the method that demultiplexing adopts time slot to interleave.
Adjust the forwarding entry in transmitting for convenience, apparatus of the present invention also comprise transmitting for one module are set, the CPU of veneer is provided with module and can adjusts forwarding entry easily by transmitting, with the purpose of the corresponding relation that reaches change link No. and IP, MAC Address.
The present invention also proposes a kind of system that realizes described method, comprises interface board, packet switching network and business board.Described interface board mainly is made up of TDM interface module and TDMoIP packaging system; Described switching network is Ethernet switch or router; Described business board mainly is made up of TDMoIP disassembling apparatus and Service Processing Module.
The TDM signal arrives the TDMoIP packaging system after entering the TDM interface module of interface board, and the TDMoIP packaging system is encapsulated into the IP bag with the TDM signal, and the IP bag that has encapsulated the TDM signal is forwarded to business board by packet switching network again; On business board, the TDMoIP disassembling apparatus extracts the TDM signal from the IP bag, and is recovered to the TDM signal when entering the TDMoIP packaging system, again the TDM signal is offered Service Processing Module and carries out corresponding service processing.
Compared with prior art, the present invention adopts IP bag carrying TDM signal, TDM signal between veneer has been used packet switching network, and no longer include jumbo TDM switching network, comparatively speaking, not only lacked a pair of TDM power board, and owing to lacked the TDM signal, the subrack backboard design becomes also and has simplified.The present invention has adopted IP to wrap the encapsulation that realizes the TDM signal, and is convenient rapid when the network capacity extension with respect to the encapsulation of MAC layer.In addition, adopt time slot to interleave multiplex technique in the present invention, the TDM link of low speed is multiplexed into the method for high-speed link, increase the payload length of TDMoIP frame, a plurality of length bags that may become with the message that short bag sends are sent, correspondingly reduce the expense of Ethernet bag preamble word, MAC head, IP head, UDP head, improved utilization of network bandwidth.
Description of drawings
Fig. 1 is the structural representation of TOP frame (TDM over Packet) in the existing scheme;
Fig. 2 is the structural representation of TDMoIP frame of the present invention (TDM over IP);
Fig. 3 is that of the inventive method uses schematic diagram;
Fig. 4 is the structural representation of TDMoIP frame of the present invention (TDM over IP) conversion equipment;
Fig. 5 is that the time slot of the little Switching Module of the present invention is adjusted schematic diagram;
Fig. 6 is that the TDM signal multiplexing that adopts of the present invention, the time slot of demultiplexing interleave schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
The present invention adopts IP to wrap and carries the TDM signal, the TDM signal is encapsulated in the IP payload according to TDMoIP frame (TDM overIP) form, re-send to packet switching network, receive the TDMoIP frame from packet switching network then, and carry out corresponding service processing after from the TDMoIP frame, extracting the TDM signal.In order to prevent that the Ethernet switching delay from causing taking place the situation that some time slot free of data sends when receiving terminal restores the TDM signal, when encapsulation TDMoIP frame, can in an IP payload, load a plurality of TDM frames continuously.
Fig. 2 is the structural representation of TDMoIP frame of the present invention (TDM over IP).As shown in the figure, the TDMoIP frame comprises MAC head, IP head and some TDM frames; The UDP head belongs to the option of TDMoIP frame, adds as required.Each TDM frame is made of link No., frame number and TDM time slot payload in the present embodiment TDMoIP frame.If do not adopt the TDM time slot to interleave multiplex technique, then each TDM frame does not comprise link No. information in the TDMoIP frame.Each TDM frame link No. is the numbering of high speed TDM link, in the unified numbering of network element high speed TDM link, system in any TDM link number all can not with other the numbering repetition of high speed TDM link of network element internal.Frame number shows the position of this frame in the TDM signal, and this frame number, renumbers since 0 after 7999 to 7999 end since 0 again.
Fig. 3 is that of the inventive method uses schematic diagram.As shown in the figure, the system that passes through IP switching network transmitting time division multiplex service of the present invention's proposition comprises interface board, packet switching network and business board.Interface board comprises TDM interface module 301 and TDMoIP packaging system 302, TDM interface module 301 is used to receive the TDM signal, and provide it to TDMoIP packaging system 302, TDMoIP packaging system 302 is used for the TDM signal is encapsulated into the IP bag, and this IP bag is forwarded to business board by packet switching network; Packet switching network can be an Ethernet switch, also can be router; Business board comprises TDMoIP disassembling apparatus 303 and Service Processing Module 304; TDMoIP disassembling apparatus 303 is used for extracting the TDM signal from IP bag, and it is recovered to TDM signal when entering TDMoIP packaging system 302; Service Processing Module 304 receives the TDM signal that TDMoIP disassembling apparatus 303 is sent, and carries out corresponding service processing, and Service Processing Module 304 is the Service Processing Modules that have the TDM interface such as digital signal processor or echo suppressor etc.
Apparatus of the present invention are divided into upstream cell and downstream units.Upstream cell is mainly finished the encapsulation of TDMoIP frame, and sends it to the function of IP network by MAC or GMAC device; Downstream units is mainly finished from IP network and is received the TDMoIP frame, and extracts the function of TDM signal from the TDMoIP frame.Fig. 4 is a kind of structural representation of TDMoIP frame of the present invention (TDM over IP) conversion equipment.Owing to adopted the TDM time slot to interleave multiplex technique,, otherwise do not comprised this two modules so the present embodiment device comprises Multiplexing module 402 and demultiplexing module 407.As shown in the figure, upstream cell comprises the little Switching Module 401 of TDM, Multiplexing module 402, TDMoIP framing module 403, sending module 404, transmits and search module 409 and MAC/GMAC device 410; Downstream units comprises MAC/GMAC device 410, transmit and search module 409, receiver module 405, TDMoIP and separate the little Switching Module 401 of frame module 406, demultiplexing module 407 and TDM.Adjust the forwarding entry in transmitting for convenience, the present embodiment device also comprises transmitting for one module 408 is set, the CPU of veneer is provided with module 408 and can adjusts forwarding entry easily by transmitting, with the purpose of the corresponding relation that reaches change link No. and IP, MAC Address.Transmitting and module 408 is set belongs to preferred human oriented design, is the option of apparatus of the present invention.
On up direction, the TDM signal carries out the time slot adjustment after entering the little Switching Module 401 of TDM, and adjusted TDM signal enters Multiplexing module 402.The method that Multiplexing module 402 adopts time slots to interleave is finished the multiplexing of low speed TDM signal, and two or many low speed TDM signal multiplexings are become high speed TDM signal, and the high speed TDM signal after multiplexing enters TDMoIP framing module 403.In TDMoIP framing module 403, mainly finish the extraction of each frame of TDM, and with a frame or multiframe data encapsulation in the IP payload, after finishing, encapsulation searches module 409 is searched the purpose business board that the notebook data frame will send from transmit IP address and MAC Address according to the TDM link No. by transmitting again, add again and go up source IP and source MAC, give sending module 404 with the TDMoIP frame afterwards.Sending module 404 is mainly finished parallel-to-serial conversion work, the TDMoIP frame is sent on Ethernet switch or the router from MAC/GMAC device 410 by sending FIFO, be forwarded to the purpose business board by Ethernet switch or router and do corresponding encoding and decoding speech, echo inhibition or some other Business Processing.
On down direction, the TDMoIP frame that other business board sends arrives the receiver module 305 of apparatus of the present invention after by Ethernet switch or router, on receiver module 305, mainly data are done string and conversion, receive the TDMoIP frame by receiving FIFO, and complete TDMoIP frame is sent to TDMoIP separate frame module 406.Separate in the frame module 406 at TDMoIP, mainly realize from the IP payload extracting the TDM frame, the link No. of record frame head, and the removal that will extract the TDM frame payload of frame head information send to demultiplexing module 407.The method that mainly interleaves according to time slot in demultiplexing module 407 is broken down into the TDM signal of some low speed, again the TDM signal is sent out this veneer from transmission interface after little Switching Module 401 exchanges of TDM.
At up direction, multiplexing each frame data buffer memory in memory gets up, and adds link No. and frame number before frame.And from transmit, inquire about IP address and MAC Address according to link No., and fill in corresponding address at IP head, MAC head, send out the MAC/GMAC device through sending FIFO then; At down direction, the data that receive from MAC/GMAC are through receiving FIFO and being saved in the memory, TDMoIP separates frame module 406 and peels MAC head, IP head, UDP header overhead off, according to link No. data are sent to corresponding high speed TDM processing module then, send to Service Processing Module after handling through demultiplexing again and finish relevant Business Processing with TDM interface.When the TDM chain converts the TDMoIP frame to, IP, MAC Address determine and the TDMoIP frame convert to TDM link behind the TDM signal determine transmit to determine that this search procedure is searched module 409 by transmitting of apparatus of the present invention and realized by searching.
The main purpose that apparatus of the present invention are provided with the little Switching Module 401 of TDM be for resource or timeslot scheduling convenient.The TDM switched circuit go into to go out to the TDM link that equal number is all arranged, maximum timeslot number on these TDM links is identical, any one go into after any one time slot on the TDM link is through TDM switched circuit, can adjust to out to any one time slot of any TDM link.Fig. 5 is that time slot of the little Switching Module of TDM is adjusted schematic diagram, goes among the figure to time slot TS[x, y] after exchange, appear at out to TS[p, q], wherein x, p be into, go out to the TDM link number, y, q are the time-gap number of this TDM link.
By Multiplexing module 402 and demultiplexing module 407, adopt insert method between time slot, apparatus of the present invention have reached low speed TDM link signal have been multiplexed into the high-speed link signal, and the purpose that the high-speed link signal is demultiplexed into low speed TDM signal.Time slot interleaves successively and to extract time slot from low speed chain circuit and be arranged in the high-speed link, supposes that participating in multiplexing low speed chain circuit has the m bar, and every low speed chain circuit has n time slot, and the high-speed link frame after then multiplexing has m * n time slot, time slot is arranged as: 00,10,20 ... [m-2] 0, [m-1] 0,01,11,21 ..., [m-2] 1 ... [m-1] 1 ..., 0[n-1], 1[n-1], 2[n-1] ..., [m-2] [n-1].For the ease of understanding, illustrate here, be multiplexed into a 8M HW (Highway) link if be numbered four E1 links of 0,1,2,3, the timeslot number of every E1 link is 32,8M HW chain time gap number is 128.After adopting time slot to interleave, 8M HW time slot is got time slot from four E1 respectively and is arranged, and arranges as shown in Figure 6.
After adopting the present invention, the TDM signal between veneer has been used packet switching network, and no longer includes jumbo TDM switching network, has not only lacked a pair of TDM power board, and owing to lacked the TDM signal, the subrack backboard design also becomes and simplified.The present invention has adopted IP to wrap the encapsulation that realizes the TDM signal, and is convenient rapid when the network capacity extension with respect to the encapsulation of MAC layer.In addition, adopt time slot to interleave multiplex technique in the present invention, the TDM link of low speed is multiplexed into the method for high-speed link, increase the payload length of TDMoIP frame, a plurality of length bags that may become with the message that short bag sends are sent, correspondingly reduce the expense of Ethernet bag preamble word, MAC head, IP head, UDP head, improved utilization of network bandwidth.
Claims (5)
1. method by IP switching network transmitting time division multiplex service is characterized in that may further comprise the steps:
The first step, according to the TDMoIP frame format, the time division multiplexing tdm signal is encapsulated into the TDMoIP frame, described TDMoIP frame comprises MAC head, IP head and some TDM frames, wherein each TDM frame is made of link No., frame number and TDM time slot payload, and the step of encapsulation TDMoIP frame is as follows:
(1) the TDM signal is encapsulated in the IP payload according to the TDMoIP frame format;
(2) add from transmit the IP address and the MAC Address of searching the purpose business board that this TDMoIP frame of obtaining will send according to the TDM link No.;
(3) add source IP address and source MAC;
(4) finish the encapsulation of TDMoIP frame, it is to be sent to give sending module etc.;
In second step, the TDMoIP frame that encapsulation is finished sends to packet switching network;
In the 3rd step, receive the TDMoIP frame from packet switching network;
In the 4th step, from the TDMoIP frame, send to Service Processing Module behind the extraction TDM signal and carry out corresponding service processing with TDM interface.
2. the method by IP switching network transmitting time division multiplex service according to claim 1 is characterized in that:
Also comprised a multiplexing step before the described first step, will treat that earlier each multiplexing frame TDM signal is buffered in the memory, the method that adopts time slot to interleave again is multi-path low speed TDM signal multiplexing one tunnel high speed TDM signal;
Extracting the TDM signal from the TDMoIP frame after, described the 4th step also comprises a demultiplexing step, is one tunnel high speed TDM signal demultiplexing multi-path low speed TDM signal, again low speed TDM signal is sent to the Service Processing Module with TDM interface and finishes relevant Business Processing;
Each TDM frame in the described TDMoIP frame also comprises link No. information, is used for identifying TDM time slot residing link position before multiplexing of this TDM frame.
3. the method by IP switching network transmitting time division multiplex service according to claim 2 is characterized in that:
Also comprised a time gas exchange step before described multiplexing step, the method that adopts time slot to interleave is carried out time gas exchange to the TDM signal and is handled;
Also comprise a time gas exchange step after described demultiplexing step, the method that adopts time slot to interleave is carried out time gas exchange to the TDM signal and is handled.
4. device of realizing the described method of claim 1 is characterized in that comprising:
TDMoIP framing module, be used for the TDM signal is encapsulated into the TDMoIP frame according to the TDMoIP frame format, and give sending module the TDMoIP frame, and described TDMoIP frame comprises MAC head, IP head and some TDM frames, and wherein each TDM frame is made of link No., frame number and TDM time slot payload;
Sending module is used to finish parallel-to-serial conversion, and the TDMoIP frame is sent on the packet switching network from media interviews control MAC/ kilomega network media interviews control GMAC device by sending fifo buffer FIFO;
Transmit and search module, be used for searching IP, MAC Address from transmitting, and from transmit, search the TDM link No. according to IP, MAC Address according to the TDM link No.;
The MAC/GMAC device is used for the TDMoIP frame is sent to packet switching network, and receives the TDMoIP frame from packet switching network;
Receiver module is used to finish string and conversion work, receives the TDMoIP frame by receiving FIFO, and complete TDMoIP frame is sent to TDMoIP separates frame module;
TDMoIP separates frame module, is used for realizing extracting the TDM frame from the IP payload, and TDM time slot payload is sent from transmission interface;
Transmit module is set, be used for the user and adjust forwarding entry, the corresponding relation of change TDM link No. and IP, MAC Address.
5. device according to claim 4 is characterized in that also comprising:
The little Switching Module of TDM is used for that the TDM signal is carried out time gas exchange and handles;
Multiplexing module, the multi-path low speed TDM signal multiplexing that is used for handling through the little Switching Module of TDM becomes one tunnel high speed TDM signal, sends into TDMoIP framing resume module then;
Demultiplexing module, being used for TDMoIP is separated the high speed TDM signal demultiplexing that frame module parses is multi-path low speed TDM signal, sends into the little Switching Module of TDM then and handles.
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| CN1738224A (en) * | 2004-08-19 | 2006-02-22 | 华为技术有限公司 | TDM data and frame format conversion circuit and method , transmission switching system and method |
-
2007
- 2007-11-14 CN CN2007101881957A patent/CN101159751B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040008718A1 (en) * | 2002-05-03 | 2004-01-15 | Cedar Point Communications | Switching architecture with packet encapsulation |
| CN1719945A (en) * | 2004-07-06 | 2006-01-11 | 华为技术有限公司 | Circuit for implementing TDM exchange on frame structure and its exchange method |
| CN1738224A (en) * | 2004-08-19 | 2006-02-22 | 华为技术有限公司 | TDM data and frame format conversion circuit and method , transmission switching system and method |
Non-Patent Citations (1)
| Title |
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| 温兆泉.draft_anavi_tdmoip_03标准草案的实现过程.硕士论文.2004,第7页第3-9行、第11页第1-14行、图3.1. * |
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| CN101159751A (en) | 2008-04-09 |
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