WO2005048494A1 - Procede et systeme permettant de delivrer un signal - Google Patents

Procede et systeme permettant de delivrer un signal Download PDF

Info

Publication number
WO2005048494A1
WO2005048494A1 PCT/JP2003/014521 JP0314521W WO2005048494A1 WO 2005048494 A1 WO2005048494 A1 WO 2005048494A1 JP 0314521 W JP0314521 W JP 0314521W WO 2005048494 A1 WO2005048494 A1 WO 2005048494A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
signal
bucket
transport
synchronous network
Prior art date
Application number
PCT/JP2003/014521
Other languages
English (en)
Japanese (ja)
Inventor
Yoshiyuki Karakawa
Masaki Bansho
Yuji Kuroki
Junichi Kawaguchi
Koji Hachiya
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2003/014521 priority Critical patent/WO2005048494A1/fr
Priority to US10/887,471 priority patent/US7593425B2/en
Publication of WO2005048494A1 publication Critical patent/WO2005048494A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2385—Channel allocation; Bandwidth allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams

Definitions

  • the present invention relates to a signal distribution method and an apparatus therefor, and more particularly to a signal distribution method and an apparatus for distributing a television signal using a synchronous network such as SONETZSDH (Synchronous Optical Network / Synchronous Digital Hierarc hy).
  • SONETZSDH Synchronous Optical Network / Synchronous Digital Hierarc hy
  • CATV CAb 1 e Television
  • DTV Digital Television
  • QAM Quadrature Amplitude Modulation
  • FIG. 1 shows a block diagram of an example of a conventional television signal distribution system.
  • a television signal received from, for example, a satellite broadcast at a CATV head-end station 10 is subjected to 64 QAM modulation by an integrated receiver receiver (IRT) 11, and then converted to a high-frequency signal RF by a converter 12.
  • the signal is converted, multiplexed by the multiplexing unit 13, and transmitted from the transmitting unit 14 to the network 15 in the form of an analog signal.
  • the high-frequency signal RF in the form of an analog signal received from the network 15 by the receiver 16 is distributed to a plurality of systems by the distributor 17, amplified by the amplifier 18, and distributed to each user through the coaxial cable 19.
  • the analog system has an old system and could not accommodate a large number of channels per line, and could not handle cable telephones, etc.
  • distribution from CATV head-end stations has been converted to digital signals via a CODEC device. It is in the f phase, when the system changes to a method of performing distribution by performing
  • FIG. 2 is a block diagram showing another example of the conventional television signal distribution system.
  • a TV received from a satellite broadcast at a CATV head-end station 20 is shown.
  • the version signal is 64 Q AM-modulated by the IRT 21 and supplied to the modulation / demodulation transmission unit 23.
  • the modulation and demodulation transmitting section 23 is supplied with a 64 QAM modulated television signal of another channel from the video switch 22.
  • the modulation / demodulation transmission unit 23 encodes the 64 Q AM modulated signal for each channel, digitizes the signal, multiplexes the signal, and converts the signal into an optical signal at, for example, a transmission rate of 2.38 Gbps. This optical signal is further optically multiplexed by the optical multiplexing unit 24 and transmitted to the optical transmission line 25.
  • the optical signal from the optical transmission line 25 is separated for each wavelength by the optical separation unit 26, photoelectrically converted by the modulation / demodulation reception unit 27, multiplexed and separated into each channel, and multiplexed for each channel and analog 64Q AM This is a modulated signal.
  • the .64Q AM modulated signal is frequency-converted to a high-frequency signal RF by a converter 28, and the high-frequency signal RF is distributed to a plurality of systems by a distribution unit 29, amplified by an amplifier 30, and then passed through each coaxial cable 31 to each user. Will be delivered to
  • the television signal is not compressed, and is directly converted into a 64 Q AM modulated signal using a band of 155.52 Mb ps per channel, and the modulation / demodulation transmission unit 23 multiplexes the signal to 2.388 Gb ps. NX 2.
  • FIG. 3 is a block diagram showing another example of the conventional television signal distribution system.
  • a television signal received from, for example, satellite broadcasting at a CATV head-end station 40 is subjected to 64 QAM modulation at an IRT 41 and supplied to a modulation / demodulation unit 43.
  • the modulation / demodulation transmission unit 43 sends the video switch 42
  • a 4 Q AM modulated television signal is provided.
  • the modulation / demodulation transmission unit 43 encodes the 64 QAM modulated signal for each channel and After multiplexing, multiplexing and electrical / optical conversion are performed, and mapped to the SONET / SDH path STS-xX at 155 Mbps per channel, supplied to the SONET / SDH transmitting unit 44, and transmitted from the SONETZSDH transmitting unit 44 to the SONETZSDH. It is transmitted to the optical transmission line 45 as a communication line O C- x X (Otical Carrier r- ⁇ ).
  • the optical signal from the optical transmission line 45 is received by the SONET / SDH receiving unit 46, and an electric signal mapped to the path STS-XX of the SONET / SDH is obtained.
  • This electric signal is multiplexed and demultiplexed into each channel by the modulation / demodulation reception unit 47, and is decoded for each channel to be an analog 64Q AM modulated signal.
  • the 64Q AM modulated signal is frequency-converted into a high-frequency signal RF by a converter 48, and the high-frequency signal RF is distributed to a plurality of systems by a distributor 49 and distributed to each user.
  • This system is very expensive compared to the conventional analog transmission system, and the control of the entire system is the management of the CODEC device and the management of the SONE TZ SDH dedicated device, and is a dual management. It was complicated.
  • Patent Document 1
  • MP EG-2 TS packets are transmitted over the SONET TZS DH transmission network.
  • a maximum of 72 channels can be received per DVB-AS I reception port of the transmission device, and distribution to the SONET / SDH network is possible.
  • the MPEG-2 TS packet was converted from the SONE TZ SDH signal of the receiving side.
  • DVB-ASI data rate 270 Mbps
  • a general object of the present invention is to provide a signal distribution method and a signal distribution apparatus capable of allocating and operating a bandwidth of a synchronous network flexibly according to a customer request.
  • the present invention provides a transport bucket of a television signal in which a plurality of channels are multiplexed, in a transmission format of a digital broadcasting standard.
  • a signal distribution method of transmitting and distributing through a synchronous network In a signal distribution method of transmitting and distributing through a synchronous network,
  • the transmission rate in the synchronous network is set according to the number of multiplexed channels for each customer.
  • FIG. 1 is a block diagram of an example of a conventional television signal distribution system.
  • FIG. 2 is a block diagram of another example of the conventional television signal distribution system.
  • FIG. 3 is a block diagram of another example of the conventional television signal transmission system.
  • FIG. 4 is a block diagram of an embodiment of a transmission system to which the signal distribution method of the present invention is applied.
  • FIG. 5 is a block diagram of one embodiment of the SONET / SDH transmission unit 53.
  • FIG. 6 is a diagram for explaining a case where the 'DVB-ASI signal is mapped to STS-1-6V.
  • FIG. 7 is a diagram for explaining the H4 byte at the time of multi-frame.
  • FIG. 8 is a view showing the data of STS-48.
  • FIG. 9 is a diagram showing a structure of four-system parallel data of STS-12.
  • FIG. 10 is a diagram showing the format of a DVB-ASI signal.
  • FIG. 11 is a block diagram for explaining transmission rate control in the present invention.
  • FIG. 12 is a diagram showing a GFP frame format.
  • FIG. 13 is a block diagram of an embodiment of the SONE TTZ SDH receiving unit 55.
  • FIG. 14 is a block diagram for explaining output rate control in the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 4 is a block diagram of an embodiment of a transmission system to which the signal distribution method of the present invention is applied.
  • CATV head-end station 50 receives, for example, a TV signal received from satellite broadcasting.
  • the John signal is converted to a DVB-ASI signal in which a plurality of channels are multiplexed by an IRT 51 and supplied to a video switch 52 as a DVB-ASI signal of one customer.
  • the video switch 52 is supplied with DVB-AS I signals of other customers, and the DVB-AS I signals of a plurality of customers selected by the video switch 52 are supplied to a plurality of SONET / SDH transmission units 53. It is supplied to each input port.
  • the DVB-ASI signal is supplied, and the SONET / SDH transmitting section 53 replaces the DVB-ASI signal with the SONETZSDH format, performs STS switching, and transmits the signal to the optical transmission line 54.
  • the optical signal from the optical transmission line 54 is received by the SONET / SDH receiving unit 55 of the local station, and after performing STS switching, is converted into a DVB-ASI signal.
  • This signal is supplied to the video switch and conversion section 56, where the selected DVB-ASI signal is converted from the MPEG-2 format to the television signal format, and further 64QAM-modulated to produce a 64QAM modulated signal. It is said.
  • the 64Q AM modulated signal is frequency-converted into a high-frequency signal RF by a converter 57, and the high-frequency signal RF is distributed to a plurality of systems by a distribution unit 58 and distributed to each user.
  • FIG. 5 shows a block diagram of one embodiment of the SONETZSDH transmission unit 53.
  • a DVB-ASI signal obtained by multiplexing up to 72 channels of an MPEG-2 signal of 3.75 Mbps is input to each of the input ports 60 to 60 m.
  • Each DVB—ASI signal is automatically waveform-equalized by an equalizer circuit 61 to 61 m, converted from a received signal clock to a device internal clock by a clock recovery circuit 62 to 62 m, and then converted to an 8B10B decoder 63. Supplied.
  • the 8B10B decoder 63 converts the 10-bit code of each DVB-ASI signal into an 8-bit code, and supplies it to the transmission rate control unit 64 as a signal whose actual character data transmission rate is a maximum of 216 Mbps.
  • the transmission rate control unit 64 controls the transmission rate of this signal while mapping it to a GFP frame.
  • SONET mapping section 65 input port 6 (assigned to each Based on the contract with the customer, the DVB input from each input port 6 Oi S Om).
  • the GFP frame which mapped the ASI signal is passed by virtual concatenation STS-1_1 V, STS-1-3 V , STS—1—5 v, STS—1—6 V, and these are mapped to channels 1 to 48 of path STS—48 shown in FIG.
  • the H4 byte at the time of the multi-stream will be described with reference to FIG.
  • the MF I (Multi Frame Indicator) is divided into lower 4 bits MF I 1 and upper 8 bits MF I 2, and MF I 1 occupies bits 5 to 8 in the H4 byte, and is incremented for each frame Is done.
  • the BWB interface 66 converts the 32-bit parallel STS-48 data shown in Fig. 8 into 4-system parallel data of each 8-bit parallel STS-12 shown in Fig. 9, and further converts it into serial data to convert the STS switch. Supply to 67.
  • the numbers 1 to 48 in FIGS. 8 and 9 indicate channel numbers.
  • the data switched by the STS switch 67 is transmitted from the transmission unit 68 to the optical transmission line 54. At this time, the signal is transmitted to the optical transmission line 54 at a transmission rate of STS-48 (2488 Mbps).
  • the SONET / SDH transmitter 53 To deliver several hundred channels of DVB-ASI signals whose format is shown in 0 (B), the SONET / SDH transmitter 53 must have several ports (S Oi G Om) as the DVB-ASI interface. become.
  • the DVB-ASI input from each of the input ports 6 Oi S Om based on the contract with the customer assigned to each of the input ports 60i to 60m. Since the GFP frame to which the signal is mapped is mapped to one of the paths STS-11V, STS-1-3V, STS-1-5V, STS-1-6V by virtual concatenation, Bandwidth can be allocated according to customer requirements, and the bandwidth of the SONETZ SDH transmission network can be used effectively.
  • FIG. 11 is a block diagram for explaining transmission rate control in the present invention.
  • each D VB- ASI signal with 8-bit code that will be supplied to the input port 60 1-6 per Om from 8B 10B decoder 63 is supplied to Baketsuto extractor I 1, extraction of the MPEG- 2TS packet Then, a K28.5 space code is extracted to synchronize the clock provided at the delimiter of the MPEG-2TS packet. All the extracted MPEG-2 TS buckets are written to the first buffer 72, but the K28.5 space code is removed when writing to the first buffer 72. However, at the time of reading the super block from the second buffer 74, at least 2 Keep the K28.5 space code between the MPEG-2 TS packets.
  • the MPEG-2TS bucket read from the first buffer 72 is subjected to 64BZ65B frame conversion by the 64BZ65B conversion unit 73 as preprocessing before being passed to the GFP matching unit 75. The frame after this conversion is called a super block.
  • This superblock is written to the second buffer 74.
  • the super block of the second buffer 74 of each port is read out by the round robin method and transferred to the GFP mapping unit 75.
  • the GFP matting unit 75 maps the supplied superblock to a GFP frame in the format shown in FIG.
  • the second buffer 74 of the port to be transferred notifies the state as a 3-bit signal T ADD to the SONET mapping unit 65 via the GFP mapping unit 75, and the response PTC from the SO NET mapping unit 65 Wait for A.
  • the GFP mapping unit If the bandwidth of the MPEG-2TS bucket input to a certain port is higher than the bandwidth of the SONET side, that is, if the MGEP-2TS packet signal is input beyond the contracted bandwidth, the GFP mapping unit The transmission of the super block to the block 75 becomes impossible, and the super blocks are accumulated in the second buffer 74.
  • the first threshold value is set in the second buffer 74 in advance to prohibit the writing of the MPEG-2 TS packet to the first buffer 72 when the capacity of the second buffer exceeds a certain value. If the first threshold value is exceeded, the MPEG-2 TS bucket is prohibited from being written into the first buffer 72, thereby discarding input data exceeding the contract band.
  • a second threshold (second threshold minus first threshold) is provided to permit writing of the MPEG-2 TS packet to the 72, and if the value falls below the second threshold, the first buffer 72 To allow the writing of MP EG-2 TS packets.
  • the input data (MPEG-2 TS packet) flow rate is By controlling the rate according to the bandwidth of the ET / SD H side, even if an MP EG-2 TS bucket exceeding the transmission bandwidth of the SONETZSD H is input, the MP EG-2 TS bucket is not suddenly discarded. It is possible to maintain the quality of data transmission by protecting for a certain period of time.
  • FIG. 13 is a block diagram of one embodiment of the SONET / SDH receiving unit 55.
  • the signal received from the optical transmission line 54 by the transmission unit 81 is supplied to the STS switch 82 and switched, and then, from the serial data by the BWB interface 83, the 8-bit parallel STS-12 4 shown in FIG.
  • the data is converted to system-parallel data, further converted to 32-bit parallel STS-48 data shown in FIG. 8, and supplied to the SONET demapping unit 84.
  • the SONET demapping unit 84 demaps the path STS-48 to the virtual concatenation paths STS-1 to 1v, STS-11 to 3v, STS-l-5v, and STS-1 to 6V, respectively. Further, it demaps the GFP frame and supplies it to the output rate control unit 85.
  • the output rate control unit 85 performs demapping of the GFP frame, controls the output rate for each output port, and supplies it to the 8B10B encoder 86.
  • the 8B 10B encoder 86 converts an 8-bit code into a 10-bit code for each output port, thereby converting a MPEG-2 signal into a DVB-ASI signal multiplexed up to 72 channels.
  • the DVB-ASI signal is sent from output ports 89i to 89m through cable drivers 87 to 87m and amplifiers 88 to 88m.
  • FIG. 14 is a block diagram for explaining output rate control in the present invention.
  • the GFP frame output from the SONET demapping unit 84 is supplied to the GFP demapping unit 91 in the output rate control 85, and from the GFP frame. Demapped to super block.
  • the de-mapped super block is read out in a round-mouth bin system and supplied to a 64B / 65B conversion unit 92 provided every output port 8989m.
  • Each 64B / 65B converter 92 converts the superblock 65B / 64B frame and returns it to the original MPEG-2 TS packet.
  • a K28.5 space code of at least 2 bytes is inserted between the MP EG-2 TS bucket obtained here.
  • the MPEG-2TS bucket is extracted by the bucket extracting unit 93 and stored in the third buffer 94.
  • the MPEG-2 TS packet stored in the third buffer 94 is read from the 8B-10B encoder 86 in parallel with each output port.
  • the 8B1OB encoder 86 performs 8B1OB conversion of the read MPEG-2 TS bucket, converts it into a 10-bit code, and outputs it serially.
  • the 8B-10B encoder 86 embeds a K28.5 space code in the gap between the MPEG-2 TS packets (actual data) to match the transmission rate.
  • the third buffer 94 When discarding 2TS packets, the third buffer
  • the CATV head-end station to the distribution destination local station can be used. It is possible to construct an inexpensive transmission system using existing SONET / SDH networks. Also, by providing a DVB-ASI signal with a path to the SONETZSDH network according to the bandwidth required by the customer, it is possible to provide a fine-grained service, and the SONE T / S DH network Since the rate control is automatically performed in accordance with the band, complicated control is not required, and the burden on the control system that controls the entire CATV head-end station 50 can be reduced.
  • high-definition television signals can be compressed to 3.75 Mb ps per channel using MPEG-2, and normal television signals can be compressed to 1.5-2 Mb ps per channel using MPEG-2.
  • a configuration in which a DVB-ASI signal obtained by multiplexing 1.5 to 2 Mb ps M? £ —2/3 packets per channel may be supplied to the video switch 52 may be employed.
  • the transmission rate control unit 64 corresponds to the transmission rate setting unit described in the claims
  • the 8B10B decoder 63 corresponds to the 8B10B decoding unit
  • the packet extraction unit 71 corresponds to the space code deletion unit
  • the first buffer 72 and the second buffer 74 correspond to packet discarding means
  • GFP mapping section 75 corresponds to GFP mapping means
  • SONET mapping section 65 corresponds to synchronous network mapping means
  • output rate control section 85 controls output rate.
  • the SONET demapping unit 84 corresponds to the synchronous network demapping unit
  • the GFP demapping unit 91 corresponds to the GFP demapping unit
  • the 8B10B encoder 86 corresponds to the 8B10B encoding unit.

Abstract

L'invention concerne un procédé permettant d'assurer le transport des paquets de signaux de télévision multiplexant une pluralité de canaux dans un format de transmission de standard de radiodiffusion numérique et leur transmission/délivrance par un réseau synchrone, la bande de réseau synchrone étant affectée et fonctionnant de façon flexible pour satisfaire à la demande d'un client par le réglage d'une vitesse de transmission dans un réseau synchrone en fonction du nombre de canaux multiplexés de chaque client
PCT/JP2003/014521 2003-11-14 2003-11-14 Procede et systeme permettant de delivrer un signal WO2005048494A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2003/014521 WO2005048494A1 (fr) 2003-11-14 2003-11-14 Procede et systeme permettant de delivrer un signal
US10/887,471 US7593425B2 (en) 2003-11-14 2004-07-08 Signal distribution method and a signal distribution apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/014521 WO2005048494A1 (fr) 2003-11-14 2003-11-14 Procede et systeme permettant de delivrer un signal

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/887,471 Continuation-In-Part US7593425B2 (en) 2003-11-14 2004-07-08 Signal distribution method and a signal distribution apparatus

Publications (1)

Publication Number Publication Date
WO2005048494A1 true WO2005048494A1 (fr) 2005-05-26

Family

ID=34587061

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/014521 WO2005048494A1 (fr) 2003-11-14 2003-11-14 Procede et systeme permettant de delivrer un signal

Country Status (1)

Country Link
WO (1) WO2005048494A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10190767A (ja) * 1996-12-27 1998-07-21 Sony Corp データ送信装置、データ受信装置およびそれらの方法
JPH10209994A (ja) * 1997-01-28 1998-08-07 Nec Corp ディジタル映像信号多重方式および分離方式
JP2002344446A (ja) * 2001-05-14 2002-11-29 Nec Corp 基幹系伝送装置における回線帯域管理方法
JP2003188843A (ja) * 2001-12-18 2003-07-04 Nec Corp 多重伝送方法および多重分離装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10190767A (ja) * 1996-12-27 1998-07-21 Sony Corp データ送信装置、データ受信装置およびそれらの方法
JPH10209994A (ja) * 1997-01-28 1998-08-07 Nec Corp ディジタル映像信号多重方式および分離方式
JP2002344446A (ja) * 2001-05-14 2002-11-29 Nec Corp 基幹系伝送装置における回線帯域管理方法
JP2003188843A (ja) * 2001-12-18 2003-07-04 Nec Corp 多重伝送方法および多重分離装置

Similar Documents

Publication Publication Date Title
JP2933133B2 (ja) ディジタル映像信号多重方式および分離方式
US6400720B1 (en) Method for transporting variable length and fixed length packets in a standard digital transmission frame
US9226010B2 (en) Channel bonding with distributed marker packets
US5583863A (en) Full service network using asynchronous transfer mode multiplexing
US5666487A (en) Network providing signals of different formats to a user by multplexing compressed broadband data with data of a different format into MPEG encoded data stream
US7039048B1 (en) Headend cherrypicker multiplexer with switched front end
JP3159926B2 (ja) 同期ディジタル信号キャリアをａｔｍディジタル信号とｓｏｎｅｔ仮想トリビュタリグループとを結合した結合信号に変換する方法および統合通信ネットワーク
US5608447A (en) Full service network
US5818511A (en) Full service network
AU7730494A (en) Broadband communications system
KR100547889B1 (ko) Ｍｐｅｇ-2 전송을 위한 널 패킷 필터링 장치
EP1545034A2 (fr) Incrustation de vidéo numérique dans des réseaux optiques passifs
JP2000332717A (ja) マルチプレクサ、デマルチプレクサおよびインターフェース装置
KR101409924B1 (ko) 혼합된 직렬 및 병렬 스트림 채널 본딩 아키텍쳐
US20050152372A1 (en) System and method for performing transmission and reception operations based on broadcast/communication convergence
JP4002560B2 (ja) Ｍｐｅｇ２ｍｐｔｓ分離型加入者分配装置及び方法
US6331989B1 (en) Multiplex transmission method and system
US7593425B2 (en) Signal distribution method and a signal distribution apparatus
KR100594052B1 (ko) 다른 동기의 신호들을 다중화하기 위한 시분할 다중화프레임과 그 송수신 방법
US7388876B2 (en) Method and system for transmitting data in two steps by using data storage provided in data transmission equipment in network
WO2005048494A1 (fr) Procede et systeme permettant de delivrer un signal
JP4364068B2 (ja) 信号配信方法及びその装置
KR20010051404A (ko) 대역폭 용량 활용을 증가시키기 위한 방법 및 시스템
US7653924B1 (en) Digital video streaming over optical network
KR0173009B1 (ko) 주문자 요구형 비디오 네트워크 시스템

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 10887471

Country of ref document: US

AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP