M241893 捌、新型說明： ’ 【新型所屬之技術領域】 本創作係關於一種有線電視反向迴路控制裝复 ^ 種可減少大量人力尋搜檢測有線電視網路故障 ^ . ^ p點的反 向迴路控制系統。 【先前技術】 反向雜訊干擾的問題一直是影響有線電視雙向☆ 路品質的主要因素之一，當業者急於擴充及推廣電=據 機（CABLE MODEM)或_的相關業務同日夺，常會因 路u所丁 γ〜 又向、、，罔 -貝不穩疋再加上工程人員素質良赛不齊而無法 明原因：種種不確定因素’使得該等推案大打折扣。-目前有線電視的網路自機房至用戶終 ::::信號傳送媒體，在網路中為保持信號的品： …等元件是必需的裝置，以確使信號自機房輸 2;/端的衰減功率能達最低。由於國内有線電視普及 流程上相當麻煩。 有“視網路業者在維修的 也就是說’一家有線電視網 ㈣傳輸網路，需要在該網路上加設至少二 器’以維持信號雙向傳輸0損的放大 修過程即需花費相當多的人力、广就此一放大器的維 網路上，因此，有線由於放大器係直接設置於 反應網路傳輪速率慢或並、去進订維修時間，通常是用戶 相關網路上的放大哭逐^連線時，該業者才會針對該區 …断路檢測及排除故障，惟，放大 M241893 器數目眾多且網路交錯連接，在問題發生到故障排除所花 費的時間已影響許多用戶的收視權益。 *請參閱第五圖所示，係為-般有線電視的纔線網路與 機房的主線路的連接示意圖’有線電視的機房主要係以光 纖線路為主，而透過HFC光節點（ 仏二 v J u )興外部纜線連接 ，而纜線再連接至各區再以 〔R 、击杻 支口口 Q 5 2 )及投落線 ^ ^ d )連接至特定區域的使用戶終 傳輸用戶，則纜線即合π f右 用戶為雙向 〜、見深即會没置有雙向放大器 持信號傳輸品質。 b 1 )，以維 請再參閱第六圖及第七圖所示，係 路雜訊干擾的發生情邢以.^ ”、、般有線電視網 王〖月形，以一條自機房接 端的纜線來說，#Γ _ @ 亚連接至用戶 心見線係分別與HFC光節點 數雙向放大器（5 Ί N z 〈 b ◦) '禝 人扣l 1 )用戶終端的分歧哭 線（5 3 )等·，w 士 、 口口 （ 5 2 )及投落M241893 新型 Description of new type: '[Technical field of new type] This creation is about a cable TV reverse loop control device ^ A reverse loop which can reduce a lot of manpower search and detect cable TV network failure ^ p ^ Control System. [Previous technology] The problem of reverse noise interference has always been one of the main factors affecting the two-way quality of cable TV. The practitioners are eager to expand and promote the related services of CABLE MODEM or _ on the same day, often due to Lu u, Ding ~~ Xiang ,,, 罔 -Bei instability, coupled with the poor quality of engineering personnel, can not explain the reason: various uncertain factors' make these push cases greatly discounted. -At present, the cable television network runs from the computer room to the end of the user :::: Signal transmission media. In the network, to maintain the signal quality:… and other components are necessary devices to ensure that the signal is attenuated from the computer room. The power can reach the lowest. Due to the popularity of domestic cable TV, the process is quite troublesome. There is "depending on the network operator's maintenance, that is, 'a cable television network transmission network, at least two devices need to be installed on the network' to maintain the signal bidirectional transmission 0 loss amplification process will cost a lot Manpower and broadband are on this dimension of the amplifier network. Therefore, because the amplifier is directly set on the reaction network, the transmission speed of the network is slow or the maintenance time is set, usually when the user is connected to the network. , The industry will only detect and troubleshoot the circuit in this area ... but the number of magnified M241893 devices is large and the network is interleaved. The time it takes to troubleshoot the problem has affected many users ’viewing rights. * Please refer to page Figure 5 shows a schematic diagram of the connection between the cable network of the general cable TV and the main line of the computer room. The computer room of the cable TV is mainly based on optical fiber lines, and is developed through HFC optical nodes (（二 v Ju). The external cables are connected, and the cables are then connected to each area and then connected to a specific area with [R, knockout branch port Q 5 2) and drop line ^ ^ d) to enable the user to transmit the user, The cable is πf, the right user is bidirectional ~, and the bidirectional amplifier is not installed to maintain the signal transmission quality when you see the depth. B 1), please refer to Figure 6 and Figure 7 again for the noise interference. The occurrence of Xing Yi. ^ ", The general cable TV king 〖moon shape, to a cable from the computer room termination, # Γ _ @ Ya connected to the user heart line system and HFC optical node number bidirectional amplifier (5 Ί N z <b ◦) '禝 人 扣 l 1） Different cry lines (5 3), etc. of the user terminal, w person, mouth (5 2), and surrender
、 ，造成纜線傳輸信號的M 自該等裴置的異常現象，如· 、雜訊，通常來 象i’先即點（50)的電射模組削波（ci· · 象、成光反射或光節點的Αρρ叫）現 …2 ·放A 11 ( 5 1 )的外殼螺絲鬆動， 毀損。 、A 未關閉或腐I虫 3 ·放大器（5 ί、& a '^ 各路輸出埠所輪A a 準不均衡或引入外部# 入的返向訊號位 滩讯而加以放大。 接合不佳造成 4 ·纜線與另1線的連接器（5 腐蝕或環境的披覆不良所致。 5 ·放大器（5 ]、从 產生 1 )的電源供應器（圖中未 M241893 之雜訊及低頻擾動干擾（hum )。 6客戶螭分歧器（5 2 )的鬆動或被非法盜接，造 成欖線傳送信號的雜訊干擾。 7投洛線（5 3 )與用戶終端機用的分歧器（5 2 )的連接器（5 4 )鬆動或環境被覆不良。 8 ·用戶終端機用使用過多連接器、（5 4 )且品質不 品質不 因素多 數據信 返回信 寬頻網 競爭數 反向迴 大器間 房可逐 再派遺 除，即 向迴路 良’易產生過大雜訊。 4所^ &方;有線電視網路產生雜訊的變動 ，除傳送影音信號外，亦有傳送需要極高可靠度的 : 二因此，如何讓纜線的避免返回雜訊的干擾，讓 唬的可靠度增加，建立一 们％疋又各易運作的雙向 才疋真正讓有線電視網路辈 诚、s 4 塔菜者旎夠與固網業者 據通矾市場的解決之道。 【新型内容】 為此，本發明的主要 改扯生丨％ J係徒供有線電視的一 工制泉置，該反向迴路控制 ，以技从^ ώ f」衣置係連接纜線與放 接收機房信號將放大器與 一斷pq私r 、 、見綠崎開，如此，機 碣放大裔並判斷那一條 一、- ^ 炼、、見線出現故障，之後， Π*古—至5玄區進行實地量測與維修即可將故障排 可有效節省人六只卜m t J柄1故丨早排 力及、'、侣紐故卩早排除時間。 欲達上述目的所使用的主要 控制裝置包含有： 竹手奴係令該反 M241893 一位址解碼器； 係連接於纜線與位址解碼器輸 一控制信號接收模組 入端間； 大裔的輸入端及接地端；及 一穩壓器，係連接 的電流轉換為位址解碼 所需之工作電源； 至繞線放大為的電源端，將放大器 為、控制信號接收模組及電控開關 j述反向迴路控制裝置係與反向放大器連接，當反向 放大器的正常動作日寺，位址解碼器會控制電控開關保持纜 線連接至反向放大器的輸人端；#機房欲檢測那―條纔線 P早1生4 ,即逐一對特定纜線上的反向迴路控制裝置 發出斷路命令，由於反向迴路控制裝置透過控制信號接收 杈=連接至纜線’ &會接收到斷路命令；當接收到斷路命 ▽日寸該控制^號接收模組會輸入至位址解碼器，由位址解 碼态控制電控開關將返回信號端接地，令反向放大器與返 回信號端斷開H機房可進行此段㈣傳輸狀態的檢 、J 士此重復對複數放大器進行逐一檢測，即可找出故 障的放大器。 由此可知，機房可透過前述方式檢測出故障的纜線位 置及放大器，故能縮小維修人員實地檢測故障的範圍，因 此，可節省相當多的維修時間。 【實施方式】 本發明係為一種配合有線電視網路纜線使用的反向迴 M241893 路控制裝4 ’令有線電視網路機房可快速瞭解並縮小故障 發生地點的搜尋範圍’ I故障發生至排除的時間能有效縮 短。 。。首先°月麥閱第一圖所示，係為-種有線電視纜線放大 的佈線圖5該放女哭θ 唸双大态疋主要由一正向放大器（30)及 一反向放大器（2 〇 )所知成 u j所、、且成，而正向、反向放大器（3 〇 )( 2 〇 )的輸出/輸入端皆連接串聯於纜線上；其中 本創作的反向迴路如：备丨驻$ r 峪&制裝置（1 〇 )係連接至該反向放大 為（2 0 )的輸入端及缓線之間，並且連接至反向放大琴 (2 0)的電源端（24VDC)以取得工作電源，請參閱第二 圖所示，其包含有： 一位址解碼器（丄丄）； 一控制信號接收楹έ r Ί 、、、且（1 2 )，係連接於纜線與位址 解碼裔（1 1 )輸入端間； 至V電控開關（1 3 )，各電控開關（1 3 )係連 接於位址解碼器' (")對應輸出端、反向放大器（2〇 )的輸入端及接地端· 扣 ，方；本貝鈿例中係以一個電控開關， 配口早返回信號端的纜線；及 一穩壓器（1 6 ) ，#、击 卜 係連接至纜線反向放大器 碼=端，將反向放大器（2〇)繼轉換為位址解 (上）、控制信號接收模、组（12)及電控開關（ 丄3 )所品之工作電源。 上述各電控開關（1 3 )係為包含有： 一電晶體（1 3 1 )，苴A朽亡山、$拉七入, ^ 丹&極立而連接於位址解碼器（ M241893 ii)的輪出端；及 、、夯（1 3 2 ) ’其激磁線圈（1 3 3 )係連接 f、电源（VCC)與電晶體（1 3 1 )的集極端間，而其切換 開關（1 3 4 )的共同端（嶋連接於i線的反向信號輸 入：，其常閉罐）則連接至反向放大器的信號輸入端 ’韦開端（NO)則連接至接地端； #上述电控開關（1 3 )係受位址解碼器（1 1 )控制 3當位址解碼器（1 1 )輸出一高電位，則使電晶體（工 :導通並對繼電器（132)通入一激磁電流，繼電 :2 2 )的常閉端（NC )切換至常閉端（NO )，令反 2大。。（2 0)的輸入端與規線的返回信號端斷開，因 二：閉端連接至接地端’故返回信號導入接地端中，而反 向放大器（20)無輪入信號。 而反 :茶閱第三圖所示’係為本創作另一實施例 向包==置（…大多構件與第二圖相同，惟，： …：域開關（13) (14) (15)，用以配 口具少返回信號端的纜線。 以上為本創作的電路及其電路動作說明，u配入 "線電視網路的機房敦備說明本創作的功效： & “… '㈣（4 0 )備有反向迴路控制 (4 1 )、反向路徑維護系、统（4 2 )、R h :i、（46)等，故可對用戶端㈣的信號t:: "分析1瞭解該段礎線的雜訊狀態，又，當有綠= M241893 路正$傳輸信號時，本創作反向迴路控制裝置（圖中未八 )與反向放大器（2 〇 )連接，其位址解碼器（丄丄= 保持電控開關（1 3 )在常閉端（NC )，使反向放大哭二 輸入^與返回^號端連接，順利傳送客戶端信號至機房（ 4 〇 )，再由機房（4 〇 )的反向迴路控制系統（$工） 、反向路徑維護系統（4 2 )及電腦（4 6 )轉接至網 網路。 j々 、田機房（4 〇 )檢測到特定纜線的雜訊異常過大時An abnormal phenomenon such as M, which causes the signal transmitted by the cable, such as ·, noise, usually comes from the radio-frequency module clipping (ci ·· image, light, i. The Αρρ of the reflection or light node is called) Now ... 2 · The housing screw of A 11 (5 1) is loose and damaged. , A is not closed or rot I. 3 · Amplifier (5 ί, & a '^ Each output port rounds A a quasi-unbalanced or introduces external return signal into the beach to amplify it. Poor connection Cause 4 · The connector of the cable and the other 1 wire (5 due to corrosion or poor coating of the environment. 5 · Amplifier (5), the power supply from 1) (no M241893 noise and low frequency disturbance in the picture) Humming. 6 Loose or illegal stealing of the customer's brancher (5 2), causing noise interference on the transmission signal of the lan line. 7 Brancher (5 3) and the brancher (5) for the user terminal. 2) The connector (5 4) is loose or the environment is poor. 8 · The user terminal uses too many connectors, (5 4), the quality is not high, the quality is not a factor, the data is returned, and the broadband network competition number is reversed. The rooms can be re-deleted one by one, that is, it is easy to generate excessive noise to the circuit. 4 The cable TV network produces noise changes. In addition to transmitting audio and video signals, there are also transmissions that require high reliability. Degree: Second, how to make the cable avoid the interference of returning noise, The increase in the number and the establishment of a two-way and easy-to-operate two-way talent can really make the cable TV network generation sincere, and s 4 tower dishes are not enough to solve the problem with the fixed network operators through the market. 【New content】 Therefore, the main modification of the present invention is that the J series is a one-piece system for cable television. The reverse loop control is used to connect the cable and the receiver room signal amplifier. With a broken pq private r, see the green sky, so, the machine amplifies the lineage and judges that the one, ^, 、, 见, and the line have failed, and then, Π * 古-to the 5 Xuan area for field measurement and Maintenance can troubleshoot can effectively save six people mt J handle 1 so 丨 early exhaustion and early elimination time. The main control devices used to achieve the above purpose include: bamboo hand slave Order the anti-M241893 one-bit address decoder; connected between the cable and the input end of a control signal receiving module input of the address decoder; the input and ground terminals of the big guy; and a voltage stabilizer, connected Current is converted into working power required for address decoding; The power supply side of the amplifier is connected to the control signal receiving module and the electric control switch. The reverse loop control device is connected to the reverse amplifier. When the reverse amplifier operates normally, the address decoder will control the electric control switch. Keep the cable connected to the input end of the inverting amplifier; # 机房 要 测 那 —The line P is born 1 and 4 earlier, that is, a pair of reverse loop control devices on a specific cable is issued a disconnection command. Because the reverse loop control device Receive the signal via the control signal = Connect to the cable '& will receive a disconnection command; when a disconnection command is received ▽ the control ^ receiver module will be input to the address decoder, and the address decoding state controls the electrical control The switch will ground the return signal terminal, so that the inverting amplifier is disconnected from the return signal terminal. The H room can check the transmission status of this section. J can repeatedly check the multiple amplifiers one by one to find the faulty amplifier. It can be known that the computer room can detect the faulty cable position and amplifier through the foregoing methods, so it can reduce the scope of fault detection by the maintenance staff on the spot, so it can save considerable maintenance time. [Embodiment] The present invention is a reverse return M241893 control device for use with a cable television network cable. 4 'Make the cable television network room quickly understand and narrow down the search range of the fault location' I Can effectively shorten the time. . . First of all, as shown in the first picture of Yue Mai, it is a kind of cable TV cable amplification. Figure 5: Let the girl cry θ The dual state is mainly composed of a forward amplifier (30) and a reverse amplifier (2 〇) Known as uj, and cheng, and the output / input terminals of the forward and reverse amplifiers (30) (20) are connected in series on the cable; the reverse loop of this creation is: The $ r 峪 & manufacturing device (10) is connected between the input terminal of the reverse amplifier (20) and the slow line, and is connected to the power terminal (24VDC) of the reverse amplifier (20). In order to obtain the working power, please refer to the second figure, which includes: a bit address decoder (丄 丄); a control signal receiving 楹 r 楹, ,, and (1 2), which are connected to the cable and Between the address decoder (1 1) input terminals; to the V electrical control switch (1 3), each electrical control switch (1 3) is connected to the corresponding output terminal of the address decoder ("), the inverting amplifier ( 2〇) the input terminal and the ground terminal, buckle, square; in this example, an electrical control switch is used, the cable with the port returning to the signal terminal early; and a voltage regulator (1 6) # ， 打 卜 系 is connected to the cable inverting amplifier code = end, and then converts the inverting amplifier (20) into an address solution (upper), a control signal receiving mode, a group (12), and an electric control switch (丄 3 ) The working power of the product. Each of the above electronic control switches (1 3) includes: a transistor (1 3 1), 苴 A dying mountain, $ 7 pull-in, ^ Dan & pole connected to the address decoder (M241893 ii ); And, the ram (1 3 2) 'its excitation coil (1 3 3) is connected between the collector terminal of f, the power supply (VCC) and the transistor (1 3 1), and its switch ( 1 3 4) The common terminal (嶋 is connected to the reverse signal input of the i-line :, its normally closed tank) is connected to the signal input terminal of the inverting amplifier, and the Wei terminal (NO) is connected to the ground terminal; The control switch (1 3) is controlled by the address decoder (1 1). When the address decoder (1 1) outputs a high potential, the transistor (conductor is turned on and the relay (132) is excited by a magnetization). Current, relay: 2 2) The normally closed end (NC) is switched to the normally closed end (NO), which makes the anti-2 large. . The input terminal of (20) is disconnected from the return signal terminal of the gauge cable. Because the closed terminal is connected to the ground terminal ', the return signal is introduced into the ground terminal, while the inverting amplifier (20) has no wheel-in signal. And the opposite: Cha read the third picture, 'This is another embodiment of the creation of Xiang Bao = = set (... most of the components are the same as the second picture, but: ...: domain switch (13) (14) (15) The above is the description of the circuit of this creation and its circuit operation. The computer room equipped with the " line TV network is prepared to explain the effect of this creation: & "... '㈣ (4 0) is equipped with reverse loop control (4 1), reverse path maintenance system, system (4 2), Rh: i, (46), etc., so the signal t :: " Analysis 1 understands the noise status of this fundamental line. When there is a green = M241893 positive $ transmission signal, the reverse loop control device (not shown in the figure) of this creative is connected to the reverse amplifier (20). The address decoder (丄 丄 = keep the electric control switch (1 3) at the normally closed end (NC), so that the reverse-amplifier input ^ and the return ^ end are connected, and the client signal is smoothly transmitted to the computer room (4)) , And then transferred to the network by the reverse loop control system ($ work), reverse path maintenance system (42) and computer (46) of the machine room (40). J々 、 田 机(4 billion) upon detection of a specific cable anomalies excessive noise
該縵線及其分支境線上的放大器進行斷路檢測，：確 :疋那—段的難造成過大雜訊。而機房會透過該條纔線 出斷路rfp々，令連接該纜線放大器的反向迴路梦番 開始作動，即（配合第：圖所示）： 制衣置The amplifiers on this chirped line and its branch line are tested for open circuit, and it is true that: that the segment is difficult to cause excessive noise. And the machine room will open the rfp 透过 through this cable, so that the reverse circuit dream fan connected to the cable amplifier will start to operate, that is (coordinated with the picture :):
反向迴路控制裝置的控制信號接收模組（1 2 )會透 過纜線讀取到斷路命令，並將該命令輸入至位址解碼（ 1 1 )中，由位址解碼器（工丄）控制電控開關（工3 ) 、換以將返回化號輸入端接地，令反向放大器（2〇） 、輪入、與返回信號輸入端斷開。如此，當機房（4 〇 ) 依：斷開反向放大器（2 0 )，即可依照返回雜訊的變化 =解是那—段I線可能產生過大雜訊，並保持該放大器的 2路以避免影響其它段用戶端的傳送信號，之後立即派 遣相關人員至該位置進行實地檢測及故障排除。 、‘上所述’本創作裝設於有線電視纜線的放大器上， 使侍機房無需再派遣多數人員進行地毯式的搜尋及檢測發 生故IV的缆線位置，即可直接對特定纜線的放大器斷路， 10 M241893 進行初步判斷雜訊發生的 圍’之後，僅需派遣一、二位人：:佰小故p早可能發生範 可，由於機戶 貝到垓處進行實地檢修即 較習用人JL Μ Μ 乍菜速度快，因此，本創作 的檢測維修程序有下列優點： 即犄“測發生雜訊的 置。 h見、、杲亚快逮判斷發生的位 2 ·即時切斷可能產生 響其它用戶傳送的信號大器的連接，避免影 可節省人：數故P早排除人員。對有線電視業者來說， 爭成本的支出。 4 ·由於本創作可 裝置的繫旦 依不同有線電視的纜線，增減電控 里’因此，又ρη | + 為& ϋ業者可選用合適的產品。 性，並符人k …、有產業上利用性、新穎性及進步 、σ新型專利要件， r R 4 午犮依法具文提出申請。 L圖式簡單說明】 (—)圖式部分 ^ 圖：係本創彳令阳人 第- -5 段纜線的連接示意圖。 〜圖：係本創&，丄 第二 較4實施例的電路圖。 二圖：係本創作x 第四 ]作另—較佳實施例的電路圖。 園· >[糸有的兩_ 的示意圖。 網路機房内設備與網際網路連線 第二Z·係一有線電視網路佈局示意圖。 第二·係部份有線電視纜線結構的示意圖。 圖：係用戶终端與有線電視I線的連接示意圖。 M241893 (二）元件代表符號 (1 0)反向迴路控制裝置 (10 ‘）反向迴路控制裝置 (1 1 )位址解碼器 (1 2 )控制信號接收模組 (13) (14) ( 1 5 )電控開關 (1 3 1 )電晶體 (1 3 2 )繼電器 (1 3 3 )激磁線圈 (1 3 4 )切換開關 (1 6 )穩壓器 (2 0 )反向放大器 (3 0 )正向放大器 (4 0 )機房 (4 1 )反向迴路控制系統 (4 2 )反向路徑維護系統 (4 3 ) R F頻道調變器 (4 4 )頻譜分析儀 (4 5 )光點切換主機 (4 6 )電腦 (5 0 )光節點 （5 1 )放大器 (5 2 )分歧器 （5 3 )投落線 (5 4 )連接器 （5 5 )連接器 (5 6 ) R F放大器The control signal receiving module (1 2) of the reverse loop control device will read the disconnection command through the cable, and input the command to the address decoder (1 1), which is controlled by the address decoder (industry). The electric control switch (3) is changed to ground the input terminal of the return signal, so that the inverting amplifier (20), the turn-in, and the return signal input terminal are disconnected. In this way, when the computer room (4 0) depends on: disconnect the inverting amplifier (2 0), you can follow the change of the return noise = the solution is that-the I line may generate excessive noise, and keep the 2 channels of the amplifier to Avoid affecting the transmission signals of the user terminals in other sections, and then immediately send relevant personnel to the location for field inspection and troubleshooting. "The above" is installed on the amplifier of the cable TV cable, so that the server room does not need to send a large number of personnel to perform carpet-like search and detection of the cable position of the occurrence of the IV, and can directly After the amplifier is disconnected, 10 M241893 makes a preliminary judgment about the occurrence of noise, only one or two people need to be dispatched: Bai Bai, so it may happen long ago, because the operator can go to the site to carry out on-site maintenance, which is more familiar JL Μ Μ is fast at first glance. Therefore, the detection and maintenance program of this creation has the following advantages: "Measure the location where noise occurs. H See ,,,,,,,,,,, and, 快 快 快, the location of the occurrence of the judgment 2 · Real-time cut-off may produce a sound The connection of signal transmission devices transmitted by other users can save people by avoiding shadows. Therefore, the number of employees can be eliminated early. For the cable TV industry, the cost of competition can be eliminated. Cables, increase or decrease the electric control 'Therefore, ρη | + is the & supplier can choose the appropriate product. And, and meet the people k…, has industrial availability, novelty and progress, σ new patent requirements, r R 4 Wuyi filed an application according to the law. L Schematic description] (—) Schematic part ^ Figure: This is the connection diagram of Lingyang people's paragraph--5 cable. ~ Photo: &, The circuit diagram of the second and fourth embodiments. The second diagram: the circuit diagram of the original x the fourth] is another-the preferred embodiment of the circuit diagram. Garden > [糸 有的 two_'s schematic diagram. In the network room Equipment and Internet connection The second Z is a schematic diagram of a cable TV network layout. The second is a schematic diagram of some cable TV cable structures. Figure: A schematic diagram of the connection between a user terminal and a cable I cable. M241893 ( 2) Symbols of component representation (1 0) reverse loop control device (10 ') reverse loop control device (1 1) address decoder (1 2) control signal receiving module (13) (14) (1 5) Electric control switch (1 3 1) transistor (1 3 2) relay (1 3 3) exciting coil (1 3 4) switch (1 6) voltage regulator (2 0) reverse amplifier (3 0) forward Amplifier (4 0) Machine room (4 1) Reverse loop control system (4 2) Reverse path maintenance system (4 3) RF channel modulator (4 4) Spectrum analyzer (4 5) Light spot In other host (46) computers (50) optical node (51) an amplifier (52) splitter (53) drop wire (54) the connector (55) connector (5 6) R F amplifier