WO2014089722A1 - 有线电视系统的室内分歧器 - Google Patents

有线电视系统的室内分歧器 Download PDF

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Publication number
WO2014089722A1
WO2014089722A1 PCT/CN2012/001687 CN2012001687W WO2014089722A1 WO 2014089722 A1 WO2014089722 A1 WO 2014089722A1 CN 2012001687 W CN2012001687 W CN 2012001687W WO 2014089722 A1 WO2014089722 A1 WO 2014089722A1
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WO
WIPO (PCT)
Prior art keywords
signal
cable
voltage
cable television
mixed
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Application number
PCT/CN2012/001687
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English (en)
French (fr)
Inventor
张镇非
Original Assignee
Chang Chen-Fei
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Publication date
Application filed by Chang Chen-Fei filed Critical Chang Chen-Fei
Priority to PCT/CN2012/001687 priority Critical patent/WO2014089722A1/zh
Publication of WO2014089722A1 publication Critical patent/WO2014089722A1/zh

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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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
    • H04N21/6473—Monitoring network processes errors
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
    • H04N7/104—Switchers or splitters

Definitions

  • An indoor splitter in particular, an indoor splitter used in a cable television system, wherein the indoor splitter has a function of detecting a disconnection.
  • the Community Antenna Television Service is a network system that uses coaxial cable to receive or transmit television signals.
  • the cable TV network system is a one-to-many long-distance transmission method (system-to-user).
  • an amplifier Amplifier ⁇ Multi Tap and Power Inserter.
  • Amplifier ⁇ Multi Tap and Power Inserter etc., to transmit the transmission signal to the remote client.
  • the cable television network system is connected to the client television through a coaxial cable.
  • the coaxial cable is added to the power inserter at a suitable distance to load the power signal to provide The power supply operates on each device.
  • the splitter has the function of dividing the transmitted signal into multiple paths.
  • the splitter is mainly composed of distributor 41 (SpIitter), high frequency transformer
  • the 42 (Coupler) and the main signal input port 43 and the main signal output port 44 are formed.
  • the distributor 41 has a first output port 411 and a second output port 412.
  • the main signal enters the barrier through the capacitor 45 through the main signal input port 43.
  • the capacitor 45 filters the power (low frequency) signal of the main signal to make the radio frequency (high frequency) signal and the power signal divergence.
  • the RF signal is transmitted to the distributor 41 via the high frequency transformer 42 and then outputted from the first output port 411 and the second output port 412, and the RF signal is transmitted back to the high frequency transformer 42 and the power signal is recombined into the main signal. It is output by the main signal output port 44 and transmitted to the next place.
  • An inductive coil 47 for passing a power signal is disposed between the two capacitors 45 and 46.
  • the shortcoming of the cable television system is that it is impossible to detect whether the cable of the user terminal is cut or stolen. From the circuit block of FIG. 1, when the main signal output port 44, the first output port 411 or When the cable TV cable from the second output port 412 to the user television is cut off, the system control terminal cannot detect that the cable television cable has become a disconnected state, and thus cannot be performed. Any anti-theft, such as immediately stopping the transmission of signals. In the process of disconnection, because the cable TV cable system is still transmitting signals, as long as the cable TV cable is cut off, you can continue to watch the cable TV. This is not only bad for the operators, but also for the paid viewers. It is not fair.
  • the main object of the present invention is to provide an indoor splitter for a cable television system, wherein the indoor splitter receives the mixed signal output by the outdoor splitter, and transmits the cable signal in the mixed signal to the user television through the disconnected detector. For users to watch.
  • the indoor splitter includes a voltage detecting unit, and the voltage detecting unit is configured to detect a cable television connection state between the cable and the user television.
  • the transistor in the voltage detecting unit enters a conducting state, and the indoor splitter can continuously receive the system control end and is transmitted through the outdoor distributor.
  • the signal is mixed, and the cable signal in the mixed signal is further transmitted to the client television.
  • the transistor in the voltage detection unit will be turned off, and the voltage detection unit will generate a detection signal to the system control end, and the system control When the terminal receives the detection signal, it will immediately stop the outdoor distributor to transmit the cable signal to the indoor splitter that sends the detection signal.
  • the present invention can detect whether the cable television cable has been cut or stolen, thereby implementing the monitoring function, and stopping the transmission of the cable television signal to the indoor splitter that is detected to be disconnected.
  • 1 is a circuit block diagram of a prior art splitter
  • FIG. 2 is a schematic diagram showing the actual connection of the indoor splitter of the cable television system of the present invention
  • FIG. 3 is a circuit block diagram of the indoor splitter of the cable television system of the present invention
  • FIG. 4 is an exemplary circuit diagram of each unit of the present invention.
  • signal separation unit 20 signal divergent structural unit
  • FIG. 3 it is a circuit block diagram of the indoor splitter of the cable television system of the present invention.
  • the indoor splitter 1 of the cable television system of the present invention has a signal input terminal la and two signal output terminals lb, lc, and the signal input terminal 1a is connected to the output end of the outdoor distributor 3, and two The signal output terminals lb, lc are connected to the client televisions 7, 7' via the hacking detectors 5, 5', respectively.
  • the outdoor distributor 3 receives the mixed signal S from the system control terminal.
  • the indoor splitter 1 of the cable television system of the present invention includes a signal separating unit 10, a signal diverging structure unit 20, a voltage detecting unit 30, a first signal mixing output unit 40, and a second signal mixing output unit 50. .
  • the indoor splitter 1 of the cable television system of the present invention is configured to receive the mixed signal S output from the outdoor distributor 3, and appropriately process the mixed signal S to capture the cable signal in the mixed signal S, and further Assigned to more than two client TVs 7, 7 ⁇
  • the signal separating unit 10 of the present invention receives the mixed signal S output from the output end of the outdoor distributor 3, and separates the mixed signal S to extract the cable signal S1 contained therein. And the voltage signal (the stolen detection signal) S2, and transmitted separately.
  • the signal divergence structure unit 20 receives the cable signal Sl, and further divides the received cable signal S1 into a first cable signal S1 1 and a second cable signal S12 and transmits them separately.
  • the voltage detecting unit 30 receives the voltage signal S2, and detects whether there is a connection between the two user televisions 7, 7' to connect the two disconnect detectors 5, 5', and in one of the disconnected detectors 5 or When 5' is removed, a detection signal is generated and transmitted to the system control terminal (not shown), so that the outdoor distributor 3 stops outputting the mixed signal S, and if the disconnection detector 5, 5' is not When removed, the voltage signal S2 is further divided into a first voltage signal S21 and a disconnection voltage detection signal S22, and respectively transmitted.
  • the first signal mixed output unit 40 receives the first cable signal S11 and the first voltage signal S21, and performs signal mixing processing on the first cable signal S11 and the first voltage signal S21, thereby generating a mixed first cable signal S1. 1 and the first mixed signal S' of the first voltage signal S21, and the first mixed signal S' is transmitted to the user terminal 7 via the disconnection detector 5 for the user to view the user television 7.
  • the second signal mixed output unit 50 receives the second cable signal S12 and the disconnection voltage detection signal S22, and mixes the second cable signal S12 with the disconnection voltage detection signal S22. Processing, thereby generating a second mixed signal S'' mixed with the second cable signal S12 and the disconnection voltage detection signal S22, and transmitting the second mixed signal S" to the other disconnected detector 5'
  • Another client TV 7' is for the user to watch the client TV 7'.
  • FIG. 4 is an exemplary circuit diagram of various units of the present invention. It is to be noted that FIG. 4 is merely an illustrative example of the features of the present invention and is not intended to limit the scope of the present invention. Therefore, the present invention includes other circuit designs that are relatively identical.
  • the signal separation unit 10 of the present invention includes a capacitor and an inductor for filtering low frequency voltage signals and high frequency cable signals.
  • the signal divergence structure unit 20 includes a plurality of resistors and a high frequency transformer.
  • the voltage detecting unit 30 includes a plurality of resistors and transistors.
  • the first signal mixing unit 40 includes a capacitor and an inductor.
  • the second signal mixing unit 50 also includes a capacitor and an inductor.
  • the voltage detecting unit can be made by selecting an appropriate value of the resistor and using the voltage dividing principle.
  • the transistor Q1 of the voltage detecting unit 30 enters an off state, at which time the voltage detecting unit 30 generates a detection signal and returns it to the system control terminal, and the system controls
  • the terminal receives the detection signal, it immediately stops the outdoor distributor 3 from transmitting the mixed signal S to the indoor splitter 1 that sends out the detection signal, so that the user cannot watch the cable television.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Details Of Television Systems (AREA)

Abstract

一种有线电视系统的室内分歧器，室内分歧器接收室外分配器输出的载波讯号，并将载波讯号中的有线电视讯号经断讯检知器传送至用户端电视，以供用户观赏。其中室内分歧器包含有电压检知单元，电压检知单元可侦测其到用户端电视之间的有线电视电缆是否被切断或盗接，当被切断或盗接时，电压检知单元会产生检知讯号并传送至系统控制端，藉以实现监控功能并停止传送有线电视讯号至用户端电视。

Description

有线电视系统的室内分歧器
技术领域
一种室内分歧器， 尤其是一种使用于有线电视系统中的室内分歧器， 其 中室内分歧器具有断讯检知的功能。 背景技术
有线电视网络系统 (Community Antenna Television Service,CATV)是一种 利用同轴电缆来接收或传输电视讯号的网络系统。 有线电视网络系统是为一 对多的远距传输方式 （系统商对用户） ， 除了利用同轴电缆传输讯号外， 尚 需使用放大器 (Amplifier^ 分歧器 (Multi Tap)及电源插入器 (Power Inserter)等 设备， 将传输讯号传送到远程的用户端。
目前有线电视网络系统藉由同轴电缆连接到用户端电视， 同轴电缆除传 输射频讯号 (Radio Frequency,RF)外， 并在适当距离加入电源插入器 (Power Inserter)以加载电源讯号， 以提供电源给各设备进行运作。
就分歧器而言， 分歧器具有将传输讯号分歧成多路的功能。 参考图 1， 为现有技术的分歧器的电路方块图， 其中主讯号包括载有射频讯号 (RF)的电 源信号 (AC90V 10A)。 分歧器主要由分配器 41(SpIitter)、 高频变压器
42(Coupler)及主讯号输入端口 43、 主讯号输出端口 44所构成。
分配器 41具有第一输出端口 411及第二输出端口 412。主讯号由主讯号 输入端口 43进入经由电容 45的阻隔， 电容 45将主讯号的电源 （低频） 讯 号滤除， 使射频 （高频） 讯号与电源信号予以分歧。
射频讯号经由高频变压器 42传输至分配器 41， 再从第一输出端口 411 及第二输出端口 412输出， 而射频讯号会再传递回高频变压器 42并再加载 电源信号汇成主讯号， 而由主讯号输出端口 44输出， 传输至下一处。 其中 于二电容 45、 46间设有供电源讯号通过的电感线圈 47。
然而， 现在有线电视系统的缺点在于无法检知用户端的有线电视缆线是 否有被切断或被盗接的情形，从图 1的电路方块得知，当主讯号输出端口 44、 第一输出端口 411或第二输出端口 412到用户端电视的有线电视缆线被切断 时， 系统控制端并无法检知此段有线电视电缆变成断讯状态， 也就无法进行 任何防盗作为， 比如立即停止传输讯号。 在断讯过程中， 因有线电视电缆的 系统仍在传递讯号， 只要把有线电视缆线被切断部份接回， 又可以继续收看 有线电视， 这样不但不利于业者的经营， 对付费收视用户更是不公平。
因此， 必须提供一种能够检知有线电视电缆是否被切断或盗接的室内分 歧器， 以解决上述现有技术的缺失。 发明内容
本发明的主要目的在于提供一种有线电视系统的室内分歧器， 其中室内 分歧器接收室外分配器输出的混合讯号， 并将混合讯号中的有线电视讯号经 断讯检知器传送至用户端电视， 以供用户观赏。
其中室内分歧器包含有电压检知单元， 电压检知单元用以侦测其与用户 端电视之间的有线电视缆线连接状态。 当电压检知单元与用户端电视连接有 断讯检知器时， 电压检知单元中的晶体管则进入导通状态， 此时室内分歧器 可持续接收系统控制端经室外分配器传输而来的混合讯号， 并进一步将混合 讯号中的有线电视讯号传送给用户端电视。
反之， 若移除电压检知单元与用户端电视的断讯检知器， 将使电压检知 单元中的晶体管进入截止状态， 而电压检知单元会产生检知讯号给系统控制 端， 系统控制端接收到检知讯号时， 会立即停止室外分配器传送有线电视讯 号到发出检知讯号的室内分歧器。
因此， 本发明能够检知有线电视电缆是否被切断或盗接的情形， 藉以实 现监控功能， 并停止传送有线电视讯号到被检知断讯的室内分歧器。 附图说明
图 1为现有技术的分歧器的电路方块图；
图 2为本发明的有线电视系统的室内分歧器的实际连接示意图； 图 3为本发明的有线电视系统的室内分歧器的电路方块示意图； 图 4为本发明各个单元的示范性电路图。
其中， 附图标记说明如下：
1 有线电视系统的室内分歧器
10 讯号分离单元 20 讯号分歧结构单元
30 电压检知单元
40 第一讯号混合输出单元
50 第二讯号混合输出单元
41 分配器
42 高频变压器
43 主讯号输入端口
44 主讯号输出端口
45、 46 电容
47 电感线圈
411 第一输出端口
412 第二输出端口
la 讯号输入端
lb、 lc 讯号输出端
3 室外分配器
5、 5r 盗接检知器
7、 丁 用户端电视
S 混合讯号
SI 有线电视讯号
S2 电压讯号
Sl l 第一有线电视讯号
S12 第二有线电视讯号
S21 第一电压讯号
S22 断讯电压检知讯号
S' 第一混合讯号
S" 第二混合讯号 具体实施方式
以下配合图式及元件符号对本发明的实施方式做更详细的说明， 以使熟 悉本领域的技术人员在研读本说明书后能据以实施。 参考图 2， 为本发明的有线电视系统的室内分歧器的实际连接示意图， 参考图 3， 为本发明的有线电视系统的室内分歧器的电路方块示意图。 如图 2所示，本发明的有线电视系统的室内分歧器 1具有一个讯号输入端 la及两 个讯号输出端 lb、 lc， 讯号输入端 la与室外分配器 3的输出端相连接， 而 两讯号输出端 lb、 lc分别经由盗接检知器 5、 5'连接至用户端电视 7、 7'。 其中室外分配器 3接收来自系统控制端传来的混合讯号 S。
如图 3所示， 本发明的有线电视系统的室内分歧器 1包括讯号分离单元 10、 讯号分歧结构单元 20、 电压检知单元 30、 第一讯号混合输出单元 40以 及第二讯号混合输出单元 50。
本发明的有线电视系统的室内分歧器 1用以接收自室外分配器 3输出的 混合讯号 S， 并对混合讯号 S进行适当处理， 藉以撷取混合讯号 S中的有线 电视讯号， 并将其进一步分配至两个以上的用户端电视 7、 7Ό
参考图 3及图 4所示，本发明的讯号分离单元 10接收来自室外分配器 3 的输出端输出的混合讯号 S， 并对混合讯号 S进行分离处理以撷取出其中所 包含的有线电视讯号 S1及电压讯号（盗接检知讯号） S2， 并分别传送出去。
讯号分歧结构单元 20接收有线电视讯号 Sl， 并将所接收的有线电视讯 号 S1进一步分为第一有线电视讯号 S1 1及第二有线电视讯号 S12, 并分别 传送出去。
电压检知单元 30接收电压讯号 S2，并检测其与两用户端电视 7、 7'之间 是否有连接该两断讯检知器 5、 5'， 且在其中一断讯检知器 5或 5'被移除时， 即产生检知讯号并传送至系统控制端 （图未示） ， 以使室外分配器 3停止输 出该混合讯号 S， 而若断讯检知器 5、 5 '未被移除时， 则将电压讯号 S2进一 步分为第一电压讯号 S21及断讯电压检知讯号 S22， 并分别传送出去。
第一讯号混合输出单元 40接收第一有线电视讯号 S11与第一电压讯号 S21 , 并对第一有线电视讯号 S11与第一电压讯号 S21进行讯号混合处理， 进而产生混合有第一有线电视讯号 S1 1与第一电压讯号 S21的第一混合讯号 S'， 并将第一混合讯号 S'经断讯检知器 5传送至用户端电视 7， 以供用户观 赏用户端电视 7。
第二讯号混合输出单元 50接收第二有线电视讯号 S12与断讯电压检知 讯号 S22， 并对第二有线电视讯号 S12与断讯电压检知讯号 S22进行讯号混 合处理，进而产生混合有第二有线电视讯号 S12与断讯电压检知讯号 S22的 第二混合讯号 S''， 并将第二混合讯号 S"经另一断讯检知器 5'传送至另一用 户端电视 7'， 以供用户观赏用户端电视 7'。
图 4为本发明各个单元的示范性电路图。 要注意的是， 图 4仅为用以说 明本发明特征的示范性实例而己， 并非用以限定本发明的范围。 因此， 本发 明包含相对等的其它电路设计。
参考图 4， 本发明的讯号分离单元 10包括电容器及电感器， 分别用以滤 除低频的电压讯号及高频的有线电视讯号。 讯号分歧结构单元 20包括多个 电阻及一高频变压器。 电压检知单元 30包括多个电阻及晶体管。 第一讯号 混合单元 40包括电容器及电感器。 第二讯号混合单元 50亦包括电容器及电 感器。
其中， 当室内分歧器 1 的讯号输入端 la与室外分配器 3连接时， 且室 内分歧器 1的讯号输出端 lb、 lc与用户端电视 7、 7'之间连接有断讯检知器 5、 5 '时， 由于断讯检知器 5、 5 '及室外分配器 3内设有如电阻的分压元件， 因此透过选用适当数值的电阻及利用分压原理， 即可使得电压检知单元 30 的晶体管 Q1进入导通状态， 此时室内分歧器 1不产生检知讯号， 因此室内 分歧器 1可持续接收系统控制端经室外分配器 3传输而来的混合讯号 S。
并进一步将第一电压讯号 S21及断讯电压检知讯号 S22分别传送到第一 讯号混合输出单元 40及第二讯号混合输出单元 50， 使第一电压讯号 S21及 断讯电压检知讯号 S22得以与第一有线电视讯号 S11 与第二有线电视讯号 S12混合成第一混合讯号 S'与第二混合讯号 S''，并传送给用户端电视 7、丁, 以提供用户观赏。
若断讯检知器 5、 5 '被移除时， 电压检知单元 30的晶体管 Q1会进入截 止状态， 此时电压检知单元 30会产生检知讯号并回传给系统控制端， 系统 控制端接收到检知讯号时， 会立即停止室外分配器 3传送混合讯号 S到发出 检知讯号的室内分歧器 1， 使用户无法收看有线电视。
以上所述仅为用以解释本发明的较佳实施例， 并非企图据以对本发明做 任何形式上的限制。 因此， 凡有在相同的发明精神下所作有关本发明的任何 修饰或变更， 皆仍应包括在本发明意图保护的范畴。

Claims

权利要求
1. 一种有线电视系统的室内分歧器， 具有一讯号输入端及两讯号输出 端， 该讯号输入端与一室外分配器的一输出端相连， 该室外分配器接收来自 一系统控制端传来的一混合讯号， 并将该混合讯号输出， 两讯号输出端透过 两盗接检知器而连接至两用户端电视， 其特征在于， 有线电视系统的该室内 分歧器包含有：
一讯号分离单元， 接收来自该输出端输出的该混合讯号， 并对该混合讯 号进行分离处理以撷取出其中所包含的一有线电视讯号及一电压讯号， 并分 别传送出去； .
一讯号分歧结构单元， 接收该有线电视讯号， 并将所接收的该有线电视 讯号进一步分为一第一有线电视讯号及一第二有线电视讯号， 并分别传送出 去；
一电压检知单元， 接收该电压讯号， 并检测其至该两用户端电视之间是 否有连接该两断讯检知器， 且在其中一断讯检知器被移除时， 产生一检知讯 号， 并传送至该系统控制端， 以使该室外分配器停止输出该混合讯号， 而若 该断讯检知器未被移除， 则将该电压讯号进一步分为一第一电压讯号及一断 讯电压检知讯号， 并分别传送出去；
一第一讯号混合输出单元， 接收该第一有线电视讯号与该第一电压讯 号， 并对该第一有线电视讯号与该第一电压讯号进行讯号混合处理， 进而产 生混合有该第一有线电视讯号与该第一电压讯号的一第一混合讯号， 并经由 该断讯检知器将该第一混合讯号传送至该用户端电视； 以及
一第二讯号混合输出单元， 接收该第二有线电视讯号与该断讯电压检知 讯号， 并对该第二有线电视讯号与该断讯电压检知讯号进行讯号混合处理， 进而产生出混合有该第二有线电视讯号与该断讯电压检知讯号的一第二混 合讯号， 并经由另一断讯检知器将第二混合讯号传送至另一用户端电视。
2. 如权利要求 1所述的有线电视系统的室内分歧器， 其特征在于， 该讯 号分离单元包括一电容器及一电感器。
3. 如权利要求 1所述的有线电视系统的室内分歧器， 其特征在于， 该讯 号分歧结构单元包括多个电阻及一高频变压器。
4. 如权利要求 1所述的有线电视系统的室内分歧器， 其特征在于， 该电 压检知单元包含一晶体管及多个电阻。
5. 如权利要求 1所述的有线电视系统的室内分歧器，.其特征在于， 该第 一讯号混合单元包括一电容器及一电感器。
6. 如权利要求 1所述的有线电视系统的室内分歧器， 其特征在于， 该第 二讯号混合单元亦包括一电容器及一电感器。
PCT/CN2012/001687 2012-12-11 2012-12-11 有线电视系统的室内分歧器 WO2014089722A1 (zh)

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CN1163679A (zh) * 1994-10-03 1997-10-29 沃尔特罗斯公司 Catv分接头
US5956075A (en) * 1996-07-22 1999-09-21 Nec Corporation CATV terminal unit
CN101500124A (zh) * 2008-02-01 2009-08-05 北京六合万通微电子技术股份有限公司 在有线电视系统中传输wlan信号的方法及无源网桥
US8027461B1 (en) * 2007-10-11 2011-09-27 Adtran, Inc. Systems and methods for splitting telecommunication signals with reduced noise

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1163679A (zh) * 1994-10-03 1997-10-29 沃尔特罗斯公司 Catv分接头
US5956075A (en) * 1996-07-22 1999-09-21 Nec Corporation CATV terminal unit
US8027461B1 (en) * 2007-10-11 2011-09-27 Adtran, Inc. Systems and methods for splitting telecommunication signals with reduced noise
CN101500124A (zh) * 2008-02-01 2009-08-05 北京六合万通微电子技术股份有限公司 在有线电视系统中传输wlan信号的方法及无源网桥

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