CN1273745A

CN1273745A - Distribution system

Info

Publication number: CN1273745A
Application number: CN98809884A
Authority: CN
Inventors: 帕维·K·西姆; 约翰·道梅尼克·德尔·佩帕; 埃里克·斯塔夫; 利·F·菲德斯; 彼得·A·伯尔; 亚历山大·冈特马克; 多米尼克·J·迪亚斯
Original assignee: NEC Australia Pty Ltd
Current assignee: NEC Australia Pty Ltd
Priority date: 1997-09-02
Filing date: 1998-09-02
Publication date: 2000-11-15
Also published as: ES2192438B1; ES2192438A1; WO1999012353A1; AUPO894297A0

Abstract

A distribution switch for a local exchange, including an access unit for switching video channels transmitted to subscribers in response to channel requests received from subscribers, and a control unit for controlling switching of the channels by the access unit in accordance with stored conditional access data. The conditional access data includes contact description data for the video channels and entitlement data for the subscribers, which is compared by the control unit for the channel requests. The switch may include a DVB interface unit for receiving DVB signals, extracting the video channels from the DVB signals, and multiplexing the video channels onto a data path for the access unit. The DVB interface unit can extract the conditional access data from the DVB signals.

Description

Distribution system

The present invention is relevant with distribution system, specifically, be distributed in digital video broadcasting (DVB) interface on the system of the vision signal that receives relevant, and the system that inserts with the switchover condition that provides these vision signals is relevant.

The distribution system of vision signal can be referring to international monopoly publication No.WO97/09827, and these patent content row are done reference of the present invention.This system energy receiving video signals is given the user with its switching.This system transmits vision signal and POTS signal with the Digital Subscriber Line transceiver by the copper cash between telecommunications switch and the user.

The dispense switch that is used for local switch designed according to this invention comprises:

The channel request switching that response receives from the user sends to the access unit of user's video channel; And

A control unit that is subjected to described access unit control, inserts the data control channel switching according to the condition of being stored.

The present invention also provides a kind of distribution system that is used for local switch, and this distribution system comprises:

A subscriber access system; And

A DVB interface unit, described DVB interface unit has the device that receives the DVB signal, extracts the device of a plurality of video channels and described video channel multichannel is merged into the device that a data path is delivered to described subscriber access system from these DVB signals that received.

Illustrate the preferred embodiments of the present invention below in conjunction with accompanying drawing.In these accompanying drawings:

Fig. 1 is a kind of block diagram of preferred embodiment of distribution system;

Fig. 2 is the block diagram of the dispense switch of system shown in Figure 1;

Fig. 3 is the block diagram of the distribution sub-rack of dispense switch shown in Figure 2;

Fig. 4 is the block diagram of the DVB channel interface unit of distribution sub-rack shown in Figure 3;

Fig. 5 is the block diagram of the switch conditional access system of distribution system shown in Figure 1;

Fig. 6 is the flow chart of the condition access procedure of switch conditional access system shown in Figure 5;

Fig. 7 inserts the format chart of message for condition;

Fig. 8 is the block diagram of the MPEG transport stream processor of channel interface shown in Figure 4 unit; And

Fig. 9 and Figure 10 are the block diagram of first and second parts of the multiplexer of channel interface shown in Figure 4 unit.

As shown in Figure 1, distribution system 2 comprises the dispense switch 4 at some local switch places of a plurality of PSTN that are configured in the telecommunication service operator respectively, is used for that user 6 is connected to video information mechanism 8 or the computer network 10 such as Internet or office building LAN are provided.Dispense switch 4 comprises some ADSL transceivers, is used for setting up the channel of communicating by letter with the corresponding A SL transceiver 12 that is configured in user 6 places for each user.These communication channels comprise the high bit rate down channel about 6Mb/s, the low bit rate two-way channel of 640kb/s and the channel of transmission POTS signal.User transceiver 12 supports at least one to watch that 14, one of the television set top boxes (STU) of video frequency program are used for Ethernet connection and a telephone terminal 18 that is used for the POTS signal of PC16.Down channel between switch 4 and the user 6 is mainly used to downloading video program, and low bit rate channel is mainly used to transmission of control signals, such as the program or channel selecting signal that are sent to dispense switch 4 by user 6.Dispense switch 4 is provided by a two-way control channel that provides mechanism 8 to be connected with video information on request, and can receiver, video information provide mechanism's 8 usefulness video feeds to download high bit rate vision signal to switch 4.

As shown in Figure 2, dispense switch 4 comprises the distribution sub-rack 20 of a reception from the video feed of the interoffice net (IEN) of SDH or ATM net and so on.Sub-rack 20 inserts or extracts video channel from video feed, these video channels are multiplexed on the data bus 24, distributes to the access sub-rack 26 of switch 4.Insert sub-rack 26 and comprise the ADSL transceiver, can select video channel from bus 24, the video channel data are sent to user 6 with the ADSL signal form according to customer requirements.These insert sub-rack 26 and can switch for each user 6 carries out channel.Each inserts handset frame 26 and all comprises an integrated gateway unit (IGU), and the control signal and the control channel that are used for receiving from user 6 switch.

As shown in Figure 3, distribute that sub-rack 20 comprises that several receiver, videos are presented, 30, one of the channel interface unit (CIU) of the video channel in access and these video feeds of multiplexing place the 32 and processing units 30 of channel-assignment unit (CDU) on the distribution bus 24 and the IGU36 of 32 control signal with multiplex video channel.

Other situations with upper-part of distribution system 2 can be referring to international monopoly publication No.WO97/09827, and these patent content row are done reference of the present invention.

As shown in Figure 4, each DVB channel interface unit 30 comprises that one receives 34.368Mb/sDVB and presents on 34 MPEG2 transport stream processor 32 and the output that is connected on mpeg processor 32, and these video channel multichannels that processor 32 is extracted are merged into the multiplexer 36 of 34 Bit datas of CDU32.CIU30 also comprises a PCR unit 38 that is connected with processor 32 and a Controlled CPU 39 that is controlled at the signal processing of carrying out in the CIU30.CPU39 also plays a part a system information (SI) processing unit 40.32 couples of 34Mb/sDVD of mpeg processor present 34 and carry out demultiplex, and multiplexer 36 is delivered in extraction the most nearly 12 MPEG video channels, is merged into the data word of a series of 34 bits.The DVB agreement can be referring to European Telecommunication Standard (ETS) 300-468,300-421,300-429,300-472 and 300-473.

Mpeg processor 32 can select G.703 serial input 42 or parallel 8 Bit datas input 44 to present 34 as its input.8 Bit datas input 44 is used for receiving from the data of a qam demodulator that is connected on a Hybrid Fiber Coax (HFC) cable or receives from one presents 155Mb/s SDH the STP-34 unit that is transformed into 4 * 34Mb/s feeds of data.Mpeg processor 32 is introduced packet jitter when these MPEG channels are exported with fixed bit rate, this shake can be removed by signal processing in set-top box, perhaps also can increase program clock benchmark (PCR) adjustment module 38, eliminate shake by the PCR markers of adjusting each MPEG output stream.For the channel that provides mechanism to encrypt by video information or present, can mpeg stream be decrypted with the access module of a PCR module or a replacement.SI processing unit 40 is CPU, is used for handling mpeg processor 32 and presents 34 system informations of extracting from DVB.

As shown in Figure 5, the switchover condition connecting system 50 of distribution system 2 comprises a Subscriber Management System (SMS) 52, is used for managing and being provided with the condition that need send to dispense switch 4 and inserts data.Condition inserts data and comprises content description data and authority of a user data, divides to be clipped in content corresponding description list and authority of a user table.Content description table (CDT) is relevant with the content of the video channel that flows to switch 4, and authority of a user table (SET) can be relevant from the content of 4 accesses of switch with the user.

Condition inserts the IGM54 in data send to dispense switch 4 by Subscriber Management System 52 the access sub-rack 26.These IGM54 have constituted a first order (L1) gateway.Data can utilize supervising the network path 56 directly to send to gateway 54 from management system 52, also can encapsulate back presenting at DVB in the past and send to DVB CIU30 in 34.Under latter event, content description table and authority of a user table send to DVB encoder 58 usefulness video channels by management system 52 and are encapsulated.Then, CIU30 extracts these tables, and the Ethernet link 60 by switch 4 sends to gateway 54 with them.

As shown in Figure 6, content description table 62 comprises the content descriptors 66 relevant with this channel content of 65 1 groups of the content types of each channel that switch 4 is received.Descriptor 66 comprises the program category (tier) relevant with the channel program, indicate the geographic restrictions of the geographic area that can watch this program and can be used to provide any maternal rank or the copyright protection information of other information of program.Authority of a user table 64 indicate for each user has listed the program category that the user can insert the classification descriptor, indicate the geographical descriptor of user geographic area and indicate closing date on the last date that the user can insert.After the request that receives that a user sends to the channel of certain content, IGU54 is with regard to this user capture authority of a user table 64 and the programming access content description table 62 with regard to being asked, relatively the result of twice visit determines whether to allow user 6 to insert the channel of being asked.As shown in Figure 6, if:

(a) program category that has at least a class and user to be asked in program or the channel class is corresponding;

(b) one of geographic area of user's geographic area and this program or channel is consistent; And

(c) current date 68 does not surpass the closing date in the SET64 as yet, just allows the user to insert.

If IGU54 determines to allow user 6 to insert, just in inserting sub-rack 26, issue a control signal, the channel that switching is asked.Distribution system 2 can be stipulated 128 program categories.Maternal rank and Copy Protection data can send STU to, show to user 6, perhaps can be used for limiting access to the program of some classification at STU14.Also can utilize this information to limit access in dispense switch 4 by increasing other corresponding datas for authority of a user table 64.

These SET and CDT are built in the switch 4 by delivery section.Those sections that form CDT are that a program is described section (PDS) and a program category is described section (TDS).SET is set up by an authority of a user section (SES).Set up a complete table and need several such sections usually.As mentioned above, the MPEG-2 transmission stream that the encapsulation multichannel that will illustrate below SET and CDT can utilize is merged into a 34Mbit/s sends to L1 gateway 54, perhaps utilizes managing gridding directly to send.

Below used every can be referring to the ITU-T recommendation of International Telecommunications Union H.220.0 (MPEG-2), MPEG2 authority file " active images and dub the information technology universal coding of information: system " (with ISO 13818-1).

PDS, SES and TDS share same MPEG2 PID (packet identifier).The character that constitutes PDS, SES and TDS is encapsulated in the MPEG2 PES grouping (flow identifier in the PES leader is OxBF) of " dedicated stream 2 " type, is designated as " PES that contains exclusive data " (stream type among the PMT is Ox06) in the program map list.In order to discern the private data stream that contains PDS, SES and TDS data, DVB CIU30 extracts by its PMT and is designated only have this private data stream first data flow of (promptly not having related video or audio stream).

Because the usable interface of mpeg encoded/multiplexer 58 relation, the data flow between SMS52 and the DVBCIU30 is an asynchronous character stream.Character sends to multiplexer 58 with the maximum rate of 19.2kbit/s.When character arrived multiplexer 58, according to available at that time output bandwidth, a PES grouping inserted in one or more characters, and (flow identifier=OxBF), the MPEG2 that inserts the PID that sets up for this data flow transmitted and flows.PES grouping can contain the character more than 178, so the PES grouping will transmit the grouping transmission with two or more MPEG2.In the transmission grouping of the beginning that contains a PES grouping, " Payload Unit begins designator " bit is set.The adaptive section filling of the transmission grouping in 184 byte data districts with a sky do not filled up in the PES grouping.Owing to do not control the number of characters of each PES grouping, adopted one to allow message synchronous asynchronous protocol fast.PPP during encapsulation process forms based on the HDLC frame is as described in chapter 4 among the Internet RFC1549 " asynchronous HDLC ".

Fig. 7 illustration 3 message formats wherein do not comprise beginning and stop bit, do not comprise for clarity any and character that insert yet.Character sends from left to right.Can be right after another message (promptly two message can be shared a common sign) after the termination flag sequence of a message.Two flag sequences in succession constitute a null message, are ignored, and do not count a Frame Check Sequence (FCS) mistake.If the frame that receives has incorrect FCS, just abandoned.Message section can be held a SES, a TDS or a PDS, but just one.A plurality of sections is unallowed in a message.The maximum length of message section (comprising any for clear and character that insert) can be 230 characters, by such as following these factors decisions:

(i) intercept and capture the time that message begins

(ii) zero defect receives the probability of a message

(iii) the utilance of transmission bandwidth does not have address field and control section as common employing the in the HDLC link, as defined among the PPP that forms at Internet1549 the 3.2nd joint FDLC frame, can omit these sections and come conserve bandwidth.

All characters all send with 8 valid data bits, and flag sequence is pointed out the beginning or the end of a message.Character stream is that 01111110 (0 * 7e) character is that benchmark is checked one by one with value.The Frame Check Sequence section is defined as 16 bits (two characters).FCS at first sends with the highest coefficient.The FCS section is by all bits of message, do not comprise that initial sum stops bit and also do not comprise for clear and any character that insert is calculated.This expression does not comprise flag sequence and FCS section itself.The termination of message is found out by determining to close flag sequence and remove the Frame Check Sequence section.The standard of FCS can be referring to ISO 3309 or ITU X.25.Utilize the Character Filling process can increase definition.The control escape character is defined as binary zero 11111101 (0 * 7d).

As previously described, DVB CIU30 supports some mixed-media network modules mixed-medias (NIM):

(a) the G.703 NIM42 of 34Mbit/s;

(b) 16/64 QAM NIM44.

As shown in Figure 8, CIU30 has following input:

(i) from the parallel input 74 of the 34Mbit/s of STP-34 SDH demultiplex unit, the STM-34 unit is presented STM-1155Mb/s and is transformed into 140Mb/s, again this signal transformation is become 34Mb/s;

It (ii) is parallel 8 bits input 72 from the non-encrypted data of integrated receiver decoder (IRD), QAM NIM44 or QPSK NIM; And

(iii) G.703 serial input 70.

The input signal 70 through the HDB3 coding that is received is transformed into NRZ signal format.This signal is delivered to Reed-Solomon chip (L64705) 76 with input 74 after being transformed into parallel form again.The Viterbi decoder configurations of FEC chip 76 becomes bypass mode.In this pattern, the input of FEC chip is 8 bit parallels and judges the byte form.The field programmable gate array of NIM card 42 (FPGA) makes inlet flow synchronous, and it is transformed into 8 bit parallel data.For PCR module 38 or the access module that the front discussed, behind FEC chip 76, be added with an access (CA) mouth 78.CA mouth 78 provides the access that MPEG2 is transmitted input office of institute stream in the stream, if necessary, is deciphered.

MPEG transmits being found by lock cell 80 synchronously of stream.Find the PID position and produce a twoport to select signal CK4 by the 24MHz master clock.The low level in each cycle that this signal provided makes stream handle 32 a mpeg data byte can be imported main FIFO82.When this signal was high level, stream was from the FIFO82 dateout, and CPU39 can insert these data.

Go into office data and deposit the RAM FIFO82 of 16k byte in, in 256 block of bytes, divide into groups to aim at 8 bit parallel forms.Visit FIFO82 carries out with the cycling rate of 24MHz.This has formed bidirectional interface for RAM, and effectively input rate is 34Mb/s, and maximum output rating is 158Mb/s (an input rate three times).Write FIFO during for low level at CK4, and read FIFO during for high level at CK4.

If comprise PCR module 38, the Incoming grouping is stamped markers with the value of 27MHz/300 counter, replaces the MPEG2 synchronizing information, adjusts to guarantee PCR.Because the program of packet alignment is arranged, synchronizing information just no longer needs.When sending bus multiplexer 36 to, data import synchronously by PCR module 38.

When receiving the PID number, it just is used for the look-up table of a 8k byte * 13bit (comprising 12 output streams and a CPU incoming stream) is conducted interviews.Each output can be sent to corresponding output stream than specific cluster of special envoy.The SI information block makes all output bit set when each stream contains these groupings.

When a grouping need send to a specific output stream, its address in 16k byte master FIFO82 just was stored in the grouping FIFO84.This address is a packet numbers, can be from 1 to 63, is drawn by packet counter 81.The grouping FIFO84 that 12 16 * 6 bits are arranged.After a grouping is sent to output stream,, read the address of next grouping more just with its address zero clearing.If next input grouping is not ready as yet, the grouping address still is zero just, so send the filler cell of a sky.An idle cell in the main FIFO82 is pointed in grouping address=0.If the input rate of certain stream is higher than output speed, the grouping address is just by overwrite, with non-vanishing.This produces a CPU and interrupts, thereby CPU39 can specify a higher output speed for this stream.The input data transfer rate of concrete stream can be selected and measurement by CPU39.

There are two kinds of mode of operations output speed can be limited in 6.608Mb/s and 5.304Mb/s or 6.312Mb/s respectively.All stream with phase same rate is synchronous.

According to these clock rates, there are two kinds of request of data (frequency=clock of request of data/8) to send to two address counters 83 of sharing main FIFO outlet side from bus multiplexer 36.The first order of counter 83 is carried out 188 frequency division, and the counting of mould 16 is carried out in the second level to the grouping that charges into stream FIFO.Each output stream is by correct address (8 bit) service that is the bit rate regulation of its appointment.Yet each stream has the address of independently dividing into groups when depositing its stream FIFO84 in.Stream sequence counter 88 guarantees that each stream provides successively.The bit rate that pattern RAM90 storage is related with each stream is to select suitable address counter 83.

In order to ensure only serving once, there are two 16 Power Generation Roads Monday (16 cycleone-shot circuit) 85 to be connected to request of data from bus multiplexer 36 for each stream.Be output as when effective at a Power Generation Road 85, have only a specific stream to be subjected to once serving.The output of circuit 85 matches with the stream sequence count and points out which stream the valid data that occurred are used for.

Write permission (WE) signal 89 to certain stream address 91 effectively the time data be sent to bus multiplexer 36 with byte from main FIFO82.

For treatment S I data, utilized the 13rd grouping FIFO84.Stream handle 32 selects to contain the PID of SI data.Data send CPU39 to, do not insert idle cell.CPU39 represents to have a grouping with a bit set, so just can read this grouping from FIFO82.If the program transfer rate is improper, available hardware DMA supports.The idle cell pointer is not sent into grouping FIFO84, because CPU carries out poll to the availability of a grouping.

Main FIFO RAM82 by to the write operation of transport stream processor 32 with an idle cell initialization.The CPU visit is selected to remove a clock the signal from twoport, and this clock is used for cpu data is write FIFO82.

PCR markers that PCR module 38 guarantees at output stream and the time alignment between the time that multiplexer 36 sends.PCR module 38 is revised the bit stream that sends to multiplexer 36 on 8 bit data bus 93.

As shown in Figures 9 and 10, bus multiplexer 36 comprises a conversion FPGA101 and a multiplexed FPGA103.

Conversion FPGA101 provides the request signal 87 of the bit rate of 3M and 6M stream to transport stream processor 32.Transport stream processor 32 produces FIFO clock, WE signal 89 and four qualified address signals 91.12 8 bit latch 100 are arranged, during a byte cycle of 3M stream, have a byte data to latch and handle the latch that a 3M transmits stream, and have two bytes to latch into each 6M latch into each.

The output of latch provides 12 bit streams after serialization, each bit stream can be a 6M channel, also can be a 3M channel.All channels that bit rate is identical are synchronous.

Reduce data transfer rate owing to utilize fixing bit to fill, each 6M channel is split into four 2.10625Mbps streams, and each 3M channel is split into two 2.10625Mbps streams.Also fill the 2.10625MHz clock synchronization that makes each channel and draw from the 33.7MHz system clock by carrying out variable bit.The output of conversion FPGA101 comprises 48 2.10625Mbps (12 * 4 2.10625Mbps) stream 102.Four streams 102 can be represented a 6M or a 3M channel.If 6M, with four streams, TS1, TS2, TS3 and TS4, and under the situation of 3M, only flow TS1 and TS2 with two, and in four every group all the other two stay need not.

48 streams 102 of conversion FPGA101 are respectively delivered to multiplexed FPGA103 with " bo_valid "." bo_valid " is the variable filling bit sign that cooperates with TS1, and former bit stream can be recovered in system after a while.Along with each stream 102 enters multiplexed FPGA103 by clock, 32 every group data bits (forming one 32 bit parallel data word the most at last) are in succession added that " bo_valid " carries out the parity calculation of serial.

Each group for 12 groups four streams TS1, TS2, TS3 and TS4 all has two memory banks 104, and each comprises the RAM of 32 12 bits.Another its data of memory bank output when a memory bank is being inserted data.

When the data readout memory, 32 data bits of all of a given channel (adding " bo_valid " and " parity check ") are read simultaneously, become a parallel data word.Parallel data word is read to 12 successively by channel 1.For each channel, stream TS1, TS2, TS3 and TS4 be simultaneously behind the speed readout memory with 8.425MHz, combines with the speed multichannel of 33.7MHz, makes in data word on the output of FPGA103 (under the situation of a 6M stream) in order ... Ch1TS1, Ch1TS2, Ch1TS3, Ch1TS4, Ch2TS1, Ch2TS2, Ch2TS3, Ch2TS4 ... occur.

Like this, 48 2.10625Mbps transmit stream (for example corresponding to 12 6M streams) and are added on the internal data bus successively time division multiplexing, and internal data bus is with transmitting the bus that constitutes one 34 bit 31 of filling sign and Parity Check Bits.

During each frame period, each DVB unit 48 parallel data word of 30 outputs is added on the bus 31, is added on the TDM bus 24 after being merged by the CDU32 multichannel.The time that data are separately exported in each DVB unit 30 is by from effective " selection " line traffic control of the low level of CDU32.These " selection " lines change state at the rising edge place of system clock, each DVBCIU30 is in its " selection " line dateout immediately after corresponding rising edge place becomes low level.

When transmitting the ATM video to the user, the MPEG2 that makes that conversion FPGA101 is included as each channel configuration transmits the circuit of 53 byte cells of the ATM that grouping is fit to defer to the AALS standard.Multiplexed FPGA103 directly sends these ATM cell to CDU32, with transmission on data/address bus 24.

Though all DVB CIU30 carry out work with the system clock of 33.8MHz, be added to 180 ° of the clock skews of each two right sub-rack.Therefore, CDU32 during the preceding half period of 33.7MHz from a sub-rack read data of a centering, during the later half cycle from another sub-rack read data.Like this, just obtained the word rate of 67.4MHz at CDU32, and each DVB CIU30 is operated in 33.7MHz.

Also carrying out error rate supervision, signal loss detection and MPEG for input channel detects.

Loopback circuit 105 is used for that any selected load is transmitted back to a diagnostics port and carries out fault detect and test.Can be at line interface, the output of conversion FPGA101 or the output loopback load of multiplexed FPGA103.

Reference clock can be by an external clock reference by 38 controls of PCR module.Just in case the internal clocking operation is provided when fault is arranged.

After the installation, PCR module 38 exists signal to receive ground PCR.This notification streams processor 32 inserts and arrives markers.The PCR module provides the clock reference 95 of 90KHz (27MHz/300) for these markers.Terminal count (TC) signal of delivering to the PCR module from PCR makes stream handle 32 its time counter synchronously.

PCR information in the MPEG2 grouping that PCR module 38 is proofreaied and correct at stream handle 32 outputs.If PCR module 38 is not installed, data wire just directly is connected between processor 32 and the multiplexer 36.The PCR module has been introduced the delay of " N " individual clock in this data path.In order to guarantee bus multiplexer operate as normal, stream number address and WE signal all postpone " N " individual clock cycle.

Can obtain and divide into groups to begin consistent markers indication from stream handle 32.When the PCR module is constantly inserted on " 0 * a 47 " surrogate data method output, deliver to bus multiplexer 36.

PCR module 38 will be gone the current time from the markers button that stream recovers, and draw the time difference.Then, it waits for the actual PCR information that is embedded in the MPEG2 stream.It adjusts this information with the time difference that had before recorded.So just can eliminate the shake that stream handle 32 causes.This operation is all carried out one by one for 12 output streams of stream handle 32.

PCR module 38 can insert the data/address bus of CPU39, therefore can be disposed and be controlled by CPU39.

What CPU39 used is Motorola 68360 microprocessors, and the operation of CPU30 is managed.Microprocessor 39 collects and treatment S I data, alarm, make mistakes and state information, and these information are delivered to IGU36.CPU39 also is responsible for each FPGA of FPGA101 and 103, PCR module 38 and the stream handle 32 of bus multiplexer 36 is configured.

Many remodeling all are conspicuous for those skilled in the art that, therefore all should list in as illustrated in conjunction with the accompanying drawings here scope of patent protection of the present invention.

Claims

1. dispense switch that is used for local mating machine comprises:

2. one kind as the dispense switch that proposed in claim 1, the request of wherein said control unit receive channel is given to access unit according to inserting data with request.

3. one kind as the dispense switch that proposed in claim 2, the condition that wherein said control unit receives from a long-distance management system inserts data.

4. one kind as the dispense switch that proposed in claim 2 or 3, described dispense switch also comprises the vision signal of a receiver, video channel, extraction conditions inserts the channel interface unit that data are delivered to control unit from vision signal.

5. one kind as the dispense switch that proposed in claim 2,3 or 4, wherein said condition inserts data and comprises the content description data of video channel and user's rights data.

6. one kind as the dispense switch that in claim 5, proposed, wherein said control unit will be compared with described rights data for the described content description data of described request, show that in described user's described rights data described user allows the video channel of being asked in the described video channel is sent to the user when allowing to insert the content of the video channel of being asked, and the feature of described content is represented by described content description data.

7. one kind as the dispense switch that in claim 6, proposed, wherein said feature comprises program category, and described rights data comprises categorical data.

8. one kind as the dispense switch that in claim 7, proposed, wherein said feature comprises geography information, and described rights data comprises geodata.

9. one kind as the dispense switch that proposed in claim 8, wherein said rights data comprises expiration data.

10. one kind as the dispense switch that proposed in claim 9, wherein said feature comprises the program classification data.

11. the dispense switch as being proposed in claim 10, wherein said switch sends to described user with described program classification data.

12. the dispense switch as being proposed in claim 11, wherein said switch and the indoor communications of user equipment of described user, described subscriber equipment utilize described program classification data to control inserting described video channel.

13. the dispense switch as being proposed in claim 10,11 or 12, wherein said program classification data comprise maternal rank and/or Copy Protection data.

14. dispense switch as in claim 9, being proposed, wherein said user is corresponding in described program category and user's described program category data, user's geodata is consistent with described geography information, and the current time allows to insert the content of the video channel of being asked during also not to described time by data representation.

15. dispense switch as in claim 4, being proposed, wherein said vision signal is the DVB signal, and described channel interface unit comprises from the DVB signal device that extracts described video channel and these video channels are multiplexed to a data path and delivers to access unit.

16. the dispense switch as being proposed in claim 15, wherein said video channel comprises the MPEG channel, and multichannel is merged into time division multiplexed signals, transmits on data path.

17. the dispense switch as being proposed in claim 15, wherein said video channel comprises the MPEG channel, and multichannel is merged into ATM cell, transmits on data path.

18. the dispense switch as being proposed in the claim more than any one, wherein said access unit comprises some DSL transceivers, is used for sending described video channel and receives described channel request.

19. a distribution system that is used for local switch comprises:

A subscriber access system; And

A DVB interface unit, described DVB interface unit have the device of reception DVB signal, extract the device of a plurality of video channels and described video channel multichannel is merged into the device that a data path is delivered to described subscriber access system from the DVB signals.

20. the distribution system as being proposed in claim 19, wherein said video channel is the MPEG channel.

21. the distribution system as being proposed in claim 20, wherein said channel multichannel is merged into time division multiplexing (TDM) signal and transmits on data path.

22. the distribution system as being proposed in claim 20, wherein said channel multichannel is merged into ATM cell and transmits on data path.

23. distribution system as in claim 21 or 22, being proposed, wherein said extraction element comprises that receives the MPEG transport stream processor that DVB presented, therefrom extracted a plurality of MPEG channels, described multichannel merges device and comprises that one is merged into the multiplexer that data word is delivered to described data path with described MPEG channel multichannel, and described subscriber access system comprises a control unit of selecting described video channel from described data path.

24. the channel request that receives from the user when one kind as the distribution system that proposed in claim 23, wherein said connecting system responds, switching and send video channel to the user, and described control unit is controlled the switching of channel.

25. the distribution system as being proposed in claim 24, wherein said DVB interface unit comprises the device of eliminating the shake in the described video channel.

26. the distribution system as being proposed in claim 19, wherein said DVB interface unit comprise that access inserts data from the condition of DVB signal.

27. the distribution system as being proposed in claim 26, wherein said condition insert data and comprise the content description data of video channel and user's rights data.

28. one kind as the distribution system that proposed in claim 27, wherein said connecting system comprises a control unit, is used for storage condition to insert data, inserts the channel that data ask forwarded user according to the condition of being stored and controls.