JP4564745B2 - ONU for subscribers with input switching function in FTTH system - Google Patents

ONU for subscribers with input switching function in FTTH system Download PDF

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JP4564745B2
JP4564745B2 JP2003416392A JP2003416392A JP4564745B2 JP 4564745 B2 JP4564745 B2 JP 4564745B2 JP 2003416392 A JP2003416392 A JP 2003416392A JP 2003416392 A JP2003416392 A JP 2003416392A JP 4564745 B2 JP4564745 B2 JP 4564745B2
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勝 長田
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ミハル通信株式会社
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本発明のＦＴＴＨシステムの入力切替え機能付き加入者用光受信端末器は、ＣＡＴＶのＦＴＴＨシステムに使用されるものである。   The optical receiver terminal for subscribers with an input switching function of the FTTH system of the present invention is used for the FTTH system of CATV.

現在のＣＡＴＶの光通信システムにはＨＦＣシステムがある。これは図４のように、ＣＡＴＶ局５０がＢＳアンテナ５１で受信したＢＳ放送波、ＣＳアンテナ５２で受信したＣＳ放送波を６４ＱＡＭヘッドエンド（６４QAM HE）からＣＡＴＶヘッドエンドを介して光送信機に送り、地上波アンテナ５３で受信したアナログ放送波をＣＡＴＶヘッドエンドから光送信機５４に送り、光送信機５４から送り出された光信号を光受信機５５で受け、それから幹線に送り出し、カスケード接続された分岐増幅器５６で分岐すると共に増幅して伝送し、分岐器５７で分岐して各加入者に供給されるようにしてある。加入者によっては、地上波アンテナ５８を備えていたり、難視聴対策施設５９から信号を受けたりして受信している。この図では加入者宅が戸建住宅としてあるが、加入者宅はマンションやアパートなどの集合住宅の場合もある。   The current CATV optical communication system includes an HFC system. As shown in FIG. 4, the BS broadcast wave received by the CATV station 50 by the BS antenna 51 and the CS broadcast wave received by the CS antenna 52 are transmitted from the 64QAM head end (64QAM HE) to the optical transmitter via the CATV head end. The analog broadcast wave transmitted and received by the terrestrial antenna 53 is transmitted from the CATV head end to the optical transmitter 54, the optical signal transmitted from the optical transmitter 54 is received by the optical receiver 55, and then transmitted to the main line and cascaded. The signal is branched and amplified by the branching amplifier 56 and transmitted by the branching unit 57 and supplied to each subscriber. Some subscribers receive a terrestrial antenna 58 or receive a signal from the difficult viewing prevention facility 59. In this figure, the subscriber's house is a detached house, but the subscriber's house may be an apartment house such as an apartment or an apartment.

近年、ＣＡＴＶの光通信システムとしてＦＴＴＨ（Fiber To The Home）システムが検討されている。これは図５のように、ＣＡＴＶ局又はＦＴＴＨ事業者は、衛星放送受信用アンテナ５１、５２で受信したＢＳ放送波、ＣＳ放送波を６４ＱＡＭヘッドエンド（６４QAM HE）からＣＡＴＶヘッドエンドを介して光送信機５４に送り、地上波アンテナ５３で受信したアナログ放送波をＣＡＴＶヘッドエンドから光送信機５４に送り、光送信機５４から送り出される光信号を光ファイバ増幅器６０で増幅して光伝送路へ送信し、光分岐器６１で分岐して加入者用光受信端末器（ＯＮＵ）に送り、ＯＮＵで光信号をＲＦ信号に変換して加入者Ａのセットトップボックス（ＳＴＢ）を介してテレビ（ＴＶ）で視聴したり、直接ＴＶで視聴したりしている。この場合、地上波アンテナ５８を設置して受信したり、難視聴対策施設５９から受信したりしている加入者もある。   In recent years, an FTTH (Fiber To The Home) system has been studied as an optical communication system for CATV. As shown in FIG. 5, the CATV station or the FTTH operator optically transmits BS broadcast waves and CS broadcast waves received by the satellite broadcast receiving antennas 51 and 52 from the 64QAM head end (64QAM HE) through the CATV head end. The analog broadcast wave sent to the transmitter 54 and received by the terrestrial antenna 53 is sent from the CATV head end to the optical transmitter 54, and the optical signal sent out from the optical transmitter 54 is amplified by the optical fiber amplifier 60 to the optical transmission line. The signal is branched by the optical branching device 61 and sent to the optical receiving terminal (ONU) for the subscriber. The optical signal is converted into the RF signal by the ONU, and the television (via the set top box (STB) of the subscriber A TV) or directly on TV. In this case, there is a subscriber who installs the terrestrial antenna 58 and receives the terrestrial antenna 58 or receives it from the difficult viewing prevention facility 59.

前記ＯＮＵは通常は図６のような構成になっており、光伝送路から受けた光信号をフォトダイオード（ＰＤ）にて電気信号（ＲＦ信号）へ変換し、このＲＦ信号をインピーダンス変換回路６２や増幅器６３を経てＳＴＢやＴＶへと送出している。また、変換直後のＲＦ信号の異常（即ち、光信号の異常）を光監視回路６４で検知して、光信号の停波や光入力レベルの低下等の異常が検知されると異常検知信号（アラーム信号：ＡＬＭ信号）を出力して、ＬＥＤやブザー等の警報器を作動させて異常が報知されるようにしてある。   The ONU is normally configured as shown in FIG. 6, and converts an optical signal received from the optical transmission path into an electrical signal (RF signal) by a photodiode (PD), and this RF signal is converted into an impedance conversion circuit 62. And sent to the STB and TV via the amplifier 63. Also, an abnormality in the RF signal immediately after the conversion (that is, an abnormality in the optical signal) is detected by the optical monitoring circuit 64, and when an abnormality such as a stop of the optical signal or a decrease in the optical input level is detected, an abnormality detection signal ( Alarm signal: ALM signal) is output, and an alarm device such as an LED or a buzzer is operated to notify the abnormality.

図５のＦＴＴＨシステムでは、ＦＴＴＨサービスの運用中に光伝送路に不具合（断線等）が発生すると光信号が停波してしまいサービスが停止する。また、ＯＮＵ内のＰＤに不具合が発生すると、光信号がＦＴＴＨサービス事業者から送られてきても、光信号が電気信号に変換されずにサービスが停止してしまう。サービスが停止した場合は加入者が事業者へ異常を連絡し、連絡を受けた事業者が異常個所や原因を探査して修復作業をしているが、伝送線路に不具合が発生した場合はその修復作業が終わるまで加入者がサービスを受けることができず、ＰＤに不具合が発生した場合はＯＮＵを交換するまでサービスを受けることができない。   In the FTTH system of FIG. 5, if a failure (disconnection, etc.) occurs in the optical transmission line during the operation of the FTTH service, the optical signal stops and the service stops. Also, if a failure occurs in the PD in the ONU, even if an optical signal is sent from an FTTH service provider, the service is stopped without the optical signal being converted into an electrical signal. When the service is stopped, the subscriber notifies the operator of the abnormality, and the operator who received the notification searches for the location and cause of the abnormality and repairs it. The subscriber cannot receive the service until the repair work is completed, and if a failure occurs in the PD, the service cannot be received until the ONU is replaced.

本発明はＦＴＴＨシステムにおいて、光信号の停波やＰＤの故障等によって光信号、ＲＦ信号の送信が停止すると、直ちに、自動的に、ＦＴＴＨサービス以外の信号源から得られる予備のＲＦ信号が加入者に送信されて、ＦＴＴＨサービス停止の影響を防止できるようにしたものである。   In the present invention, in the FTTH system, when transmission of an optical signal or an RF signal is stopped due to optical signal stoppage or PD failure, a spare RF signal obtained from a signal source other than the FTTH service is automatically and immediately joined. To prevent the influence of the FTTH service stoppage.

本願の第１のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、図１のように、ＦＴＴＨシステムの光送信機から光伝送路を通して送信される光信号を受信し、その光信号を電気信号（ＲＦ信号）に変換して加入者に送るＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、ＦＴＴＨシステムにおいて受信した光信号を電気信号に変換する光／電気変換部１と、変換されたＲＦ信号を伝送するＦＴＴＨ信号伝送系路２と、前記光信号を監視して光信号の異常検出時に切替信号を出力する光監視回路３と、ＦＴＴＨシステムとは別である加入者に設置されているアンテナ又はＣＡＴＶによる既設のＲＦ信号源による予備ＲＦ信号源と、その予備ＲＦ信号源からの予備ＲＦ信号を伝送可能な予備信号伝送系路４と、予備信号伝送系路４と前記ＦＴＴＨ信号伝送系路２を切替え可能な切替器５と、前記予備ＲＦ信号が入力される予備信号入力端子１０を備え、前記予備信号伝送系路４は予備信号入力端子１０と前記切替器５の間に設けられ、前記光監視回路３はＲＦ信号の異常時に前記光監視回路３からの出力に基づいて切替信号を出力し、前記切替器５は前記光監視回路３から送られる前記切替信号に基づいてＦＴＴＨ信号伝送系路２から予備信号伝送系路４に切替えられると、前記予備ＲＦ信号が前記予備信号伝送系路４から加入者に伝送されるようにするものであり、前記光／電気変換部１とＦＴＴＨ信号伝送系路２と光監視回路３を一つの筺体にまとめて送信側機器７とし、前記切替器５と予備信号伝送系路４とを前記筺体と別の筺体にまとめて切替側機器８とし、前記送信側機器７にＲＦ出力端１２と、切替信号出力端１３が設けられ、前記切替側機器８にＦＴＴＨシステムのＲＦ信号を入力可能な入力端子９と、切替信号入力端子１１と、予備ＲＦ信号を入力可能な予備ＲＦ信号入力端子１０が設けられ、予備信号伝送系路４は予備ＲＦ信号入力端子１０と切替器５の間に設けられ、前記送信側機器７のＲＦ出力端１２と切替側機器８のＲＦ信号入力端子９が接続・離脱可能であり、前記送信側機器７の切替信号出力端１３と切替側機器８の切替信号入力端子１１が接続・離脱可能であり、前記予備ＲＦ信号入力端子１０に予備ＲＦ信号源が接続・離脱可能なものである。 The ONU for a subscriber with an input switching function in the first FTTH system of the present application receives an optical signal transmitted through an optical transmission line from an optical transmitter of the FTTH system as shown in FIG. In an ONU for a subscriber with an input switching function in an FTTH system that converts it into an (RF signal) and sends it to a subscriber, an optical / electrical converter 1 that converts the optical signal received in the FTTH system into an electrical signal, and the converted RF FTTH signal transmission path 2 for transmitting a signal, optical monitoring circuit 3 for monitoring the optical signal and outputting a switching signal when an abnormality of the optical signal is detected, and a subscriber different from the FTTH system. A spare RF signal source by an existing RF signal source by an antenna or CATV, and a spare signal transmission line 4 capable of transmitting a spare RF signal from the spare RF signal source And a switch 5 capable of switching between the backup signal transmission path 4 and the FTTH signal transmission path 2, and a backup signal input terminal 10 to which the backup RF signal is input. Provided between the signal input terminal 10 and the switch 5, the light monitoring circuit 3 outputs a switching signal based on the output from the light monitoring circuit 3 when the RF signal is abnormal, and the switch 5 When the FTTH signal transmission path 2 is switched to the backup signal transmission path 4 based on the switching signal sent from the monitoring circuit 3, the backup RF signal is transmitted from the backup signal transmission path 4 to the subscriber. is intended to, and the light / electric converter section 1 and the FTTH signal transmission line 2 and the optical monitoring circuit 3 are summarized into a single housing as a transmitting device 7, the switch 5 and the standby signal transmission path 4 In a separate body from the above As the switching side device 8, the transmission side device 7 is provided with an RF output terminal 12 and a switching signal output terminal 13, an input terminal 9 capable of inputting an RF signal of the FTTH system to the switching side device 8, and a switching signal input A spare RF signal input terminal 10 capable of inputting a spare RF signal is provided, and a spare signal transmission line 4 is provided between the spare RF signal input terminal 10 and the switch 5 . The RF output terminal 12 and the RF signal input terminal 9 of the switching device 8 can be connected and disconnected, and the switching signal output terminal 13 of the transmitting device 7 and the switching signal input terminal 11 of the switching device 8 can be connected and disconnected. A backup RF signal source can be connected to and disconnected from the backup RF signal input terminal 10.

本願の第２のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、前記第１のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて
ＦＴＴＨシステムの光信号を変換したＲＦ信号を検波する検波回路６をも設け、ＲＦ信号の異常時に検波回路６からの出力に基づいて光監視回路３から切替信号が出力されるものである。 The subscriber ONU with an input switching function in the second FTTH system of the present application is a detection circuit 6 for detecting an RF signal obtained by converting an optical signal of the FTTH system in the subscriber ONU with an input switching function in the first FTTH system . And a switching signal is output from the optical monitoring circuit 3 based on the output from the detection circuit 6 when the RF signal is abnormal.

本願の第３のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、前記第１又は前記第２のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、送信側機器７に検波回路６をも備えたものである。 The third function subscriber ONU switching input in FTTH system of the present application, in the first or the second input in FTTH system switching function subscriber ONU, also comprises a detection circuit 6 to the transmission side apparatus 7 It is a thing.

本願の第４のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、ＦＴＴＨシステムの光送信機から光伝送路を通して送信される光信号を受信し、その光信号を電気信号（ＲＦ信号）に変換して加入者に送るＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、ＦＴＴＨシステムにおいて受信した光信号を電気信号（ＲＦ信号）に変換して加入者に送る光／電気変換部１と、変換されたＲＦ信号を伝送するＦＴＴＨ信号伝送系路２と、前記光信号を監視して光信号の異常時に警報信号を出力する光監視回路３と、前記ＲＦ信号を検波する検波回路６と、検波回路６でＲＦ信号の異常が検出されると切替信号を出力するＲＦ監視回路１４と、ＦＴＴＨシステムとは別である加入者に設置されているアンテナ又はＣＡＴＶによる既設のＲＦ信号源による予備ＲＦ信号源と、予備ＲＦ信号源からの予備ＲＦ信号伝送可能な予備信号伝送系路４と、予備信号伝送系路４と前記ＦＴＴＨ信号伝送系路２を切替え可能な切替器５と、予備信号入力端子１０を備え、前記予備信号伝送系路４は予備信号入力端子１０と前記切替器５の間に設けられ、前記切替器５は前記ＲＦ監視回路１４から送られる前記切替信号に基づいてＦＴＴＨ信号伝送系路２から予備信号伝送系路４に切替えられて、前記予備ＲＦ信号が前記予備信号伝送系路４から加入者に伝送されるようにするものであり、前記光／電気変換部１とＦＴＴＨ信号伝送系路２と光監視回路３とを一つの筺体にまとめて送信側機器７とし、検波回路６とＲＦ監視回路１４と切替器５と予備信号伝送系路４とを前記筺体と別の筺体にまとめて切替側機器８とし、前記送信側機器７にＲＦ出力端１２が設けられ、前記切替側機器８にＦＴＴＨシステムのＲＦ信号を入力可能な入力端子９と、予備ＲＦ信号源からの予備ＲＦ信号を入力可能な予備ＲＦ信号入力端子１０が設けられ、前記予備信号伝送系路４は予備信号入力端子１０と前記切替器５の間に設けられ、前記送信側機器７のＲＦ出力端１２と切替側機器８のＲＦ信号入力端子９が接続・離脱可能であり、前記予備ＲＦ信号入力端子１０に予備ＲＦ信号源が接続・離脱可能なものである。 The ONU for a subscriber with an input switching function in the fourth FTTH system of the present application receives an optical signal transmitted through an optical transmission line from an optical transmitter of the FTTH system, and converts the optical signal into an electrical signal (RF signal). In the ONU for subscribers with an input switching function in the FTTH system that is sent to the subscriber, the optical / electric converter 1 that converts the optical signal received in the FTTH system into an electrical signal (RF signal) and sends it to the subscriber, and conversion An FTTH signal transmission path 2 for transmitting the RF signal, an optical monitoring circuit 3 for monitoring the optical signal and outputting an alarm signal when the optical signal is abnormal, a detection circuit 6 for detecting the RF signal, and a detection An RF monitoring circuit 14 that outputs a switching signal when an abnormality of the RF signal is detected by the circuit 6, and an antenna installed in a subscriber different from the FTTH system or Switch between a spare RF signal source using an existing RF signal source by CATV, a spare signal transmission path 4 capable of transmitting a spare RF signal from the spare RF signal source, a spare signal transmission path 4 and the FTTH signal transmission path 2 And a spare signal input terminal 10. The spare signal transmission path 4 is provided between the spare signal input terminal 10 and the switch 5, and the switch 5 is connected to the RF monitoring circuit 14. Based on the switching signal sent, the FTTH signal transmission path 2 is switched to the backup signal transmission path 4 so that the backup RF signal is transmitted from the backup signal transmission path 4 to the subscriber. The optical / electrical converter 1, the FTTH signal transmission path 2 and the optical monitoring circuit 3 are combined into a single casing to form a transmission side device 7, and a detection circuit 6, an RF monitoring circuit 14, a switch 5, and a spare signal Transmission line 4 A switch-side device 8 is formed in a separate case from the recording case, the transmission-side device 7 is provided with an RF output terminal 12, an input terminal 9 that can input an RF signal of the FTTH system to the switch-side device 8, and a spare A spare RF signal input terminal 10 capable of inputting a spare RF signal from an RF signal source is provided, and the spare signal transmission path 4 is provided between the spare signal input terminal 10 and the switch 5, 7 and the RF signal input terminal 9 of the switching side device 8 can be connected / disconnected, and a spare RF signal source can be connected / disconnected to the spare RF signal input terminal 10.

本願の第５のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、前記第１乃至第４のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、切替器５はＦＴＴＨシステムの異常が回復して光信号またはそれを変換したＲＦ信号が回復すると、光監視回路３或いはＲＦ監視回路１４からの切替信号の出力が停止して切替器５が予備信号伝送系路４からＦＴＴＨ信号伝送系路２に切替えられて、ＦＴＴＨシステムのＲＦ信号が加入者に伝送されるものである。 Fifth function subscriber ONU switching input in FTTH system of the present application, in the first to fourth input in FTTH system switching function subscriber ONU, switch 5 is recovered abnormalities FTTH system When the optical signal or the RF signal converted from the optical signal is recovered, the output of the switching signal from the optical monitoring circuit 3 or the RF monitoring circuit 14 is stopped, and the switch 5 is switched from the spare signal transmission line 4 to the FTTH signal transmission line 2. When switched, the RF signal of the FTTH system is transmitted to the subscriber.

本願の第６のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、前記第１乃至第４のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、光監視回路３から出力される切替信号を警報信号と兼用としたものである。 The ONU for a subscriber with an input switching function in the sixth FTTH system of the present application warns the switching signal output from the optical monitoring circuit 3 in the ONU for a subscriber with an input switching function in the first to fourth FTTH systems . It is also used as a signal.

本願の第７のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵは、前記第１乃至第６のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、切替側機器８が予備ＲＦ信号入力端子１０に接続されるアンテナに給電をＯＮ／ＯＦＦできる電源重畳機能を備えたものである。 Seventh function subscriber ONU switching input in FTTH system of the present application, in the first to sixth input in FTTH system switching function subscriber ONU, the switching side device 8 is in the pre RF signal input terminal 10 A power supply superimposing function capable of turning on / off the power supply to the connected antenna is provided.

本発明のＦＴＴＨシステムの入力切替え機能付き加入者用光受信端末器（ＯＮＵ）は次のような効果がある。   The optical receiver terminal (ONU) for subscribers with an input switching function of the FTTH system of the present invention has the following effects.

ＦＴＴＨサービスの光信号の異常発生時に、加入者宅に設置されたＯＮＵの切替回路が自動的に予備信号伝送系路に切替えられて、個々の家庭に通常設置されているアンテナや、電波障害用のＣＡＴＶの既設共聴などから得られる信号を予備のＲＦ信号とするので、ＦＴＴＨサービス本来の信号と同じ信号を加入者に送ることもできる。また、加入者の停波は切替時のみとなり、完全停波を防止可能となる。監視回路から警報信号を出力させてＬＥＤとかブザーなどを作動させれば、ＦＴＴＨサービスの異常を異常発生時に自動的に確認することができ、その後の修復作業に役立つ。監視回路からの切替信号を警報信号としても利用できるため、ＯＮＵの構成が簡潔になり、ＯＮＵの小型化、コストダウンが可能となる。   When an optical signal error occurs in the FTTH service, the ONU switching circuit installed in the subscriber's home is automatically switched to the backup signal transmission line, and the antennas normally installed in each home or for radio interference Since the signal obtained from the existing CATV system is used as a spare RF signal, the same signal as the original signal of the FTTH service can be sent to the subscriber. In addition, the subscriber's wave is stopped only at the time of switching, and complete wave breakage can be prevented. If an alarm signal is output from the monitoring circuit and an LED or a buzzer is operated, an abnormality in the FTTH service can be automatically confirmed when an abnormality occurs, which is useful for subsequent repair work. Since the switching signal from the monitoring circuit can also be used as an alarm signal, the configuration of the ONU is simplified, and the size and cost of the ONU can be reduced.

ＲＦ信号を監視して切替信号を出力するので、ＲＦ信号の異常常時も切替回路が自動的に予備信号伝送系路に切替えられて、個々の家庭に通常設置されているアンテナや、電波障害用のＣＡＴＶの既設共聴などから得られる予備のＲＦ信号を使用して、ＦＴＴＨサービス本来の信号と同じ信号を加入者に送ることもできる。また、ＯＮＵ内のＲＦ回路の異常を検知することもできる。   Since the RF signal is monitored and the switching signal is output, the switching circuit is automatically switched to the standby signal transmission line even when the RF signal is abnormal, and the antenna or radio wave interference normally installed in each home is used. It is also possible to send the same signal as the original signal of the FTTH service to the subscriber by using a spare RF signal obtained from existing CATV of the CATV. It is also possible to detect an abnormality in the RF circuit in the ONU.

送信側機器と切替側機器とを別体にし、送信側機器のＲＦ出力端を切替側機器のＲＦ入力端子に、前記送信側機器の切替信号出力端を切替側機器の切替信号入力端子に接続・離脱可能としたので、加入者に既存の加入者用光受信端末器（ＯＮＵ）が設置されている場合は、切替側機器を付加するだけで入力切替え機能付き加入者用光受信端末器とすることができるため、既存のＯＮＵを有効利用でき、既存のＯＮＵが無駄にならない。監視回路からの切替信号を警報信号としても利用できるため、ＯＮＵの構成が簡潔になり、ＯＮＵの小型化、コストダウンが可能となる。   Separate the transmitting device and the switching device, connect the RF output terminal of the transmitting device to the RF input terminal of the switching device, and connect the switching signal output terminal of the transmitting device to the switching signal input terminal of the switching device Since it is possible to detach, if the subscriber has an existing optical receiver terminal (ONU) installed, the subscriber optical receiver terminal with an input switching function can be obtained simply by adding a switching device. Therefore, the existing ONU can be used effectively, and the existing ONU is not wasted. Since the switching signal from the monitoring circuit can also be used as an alarm signal, the configuration of the ONU is simplified, and the size and cost of the ONU can be reduced.

送信側機器と切替側機器とを別体にし、送信側機器のＲＦ出力端を切替側機器のＲＦ入力端子に接続・離脱可能としたので、送信側機器を備えている加入者は切替側機器を付加すればよく、無駄が無い。また、切替側機器にＲＦ監視回路を設けて、ＲＦ信号の異常時に切替信号が発生するようにしたので、送信側機器に光監視回路がなくても、光信号及びＲＦ回路の異常を検知して切替器を切替えて、ＦＴＴＨサービス本来の信号と同じ信号を加入者に送ることができる。   Since the transmission side device and the switching side device are separated, and the RF output terminal of the transmission side device can be connected to and disconnected from the RF input terminal of the switching side device, the subscriber having the transmission side device can switch to the switching side device. Can be added and there is no waste. In addition, since an RF monitoring circuit is provided in the switching device so that a switching signal is generated when the RF signal is abnormal, an abnormality in the optical signal and the RF circuit is detected even if the transmitting device does not have an optical monitoring circuit. By switching the switch, the same signal as the original signal of the FTTH service can be sent to the subscriber.

ＦＴＴＨサービスの光信号又はそれを変換したＲＦ信号の異常が回復すれば、加入者宅に設置されたＯＮＵの切替回路が自動的にＦＴＴＨ信号伝送系路に復帰して、ＦＴＴＨサービス本来の信号が加入者に送られる。   When the optical signal of the FTTH service or the RF signal converted from it is recovered, the ONU switching circuit installed at the subscriber's home automatically returns to the FTTH signal transmission line, and the original signal of the FTTH service is restored. Sent to the subscriber.

（実施形態１）
本発明のＦＴＴＨシステムの入力切替え機能付き加入者用光受信端末器（ＯＮＵ）の第１の実施形態を図１に基づいて説明する。図１は図５に示すＦＴＴＨシステムのＯＮＵに代えて使用されるものであり、図６に示す既存のＯＮＵに、予備のＲＦ信号を伝送可能な予備信号伝送系路４と、その入力側に入力端子１０を、出力側に切替器（ＲＦスイッチ）５を付加してある。予備信号伝送系路４はＦＴＴＨシステム以外のシステムから得られる予備のＲＦ信号、例えば、図５に示す個々の加入者のアンテナ５８や、難視聴対策施設５９等から得られる予備のＲＦ信号を伝送するためのものである。 (Embodiment 1)
A first embodiment of an optical receiver terminal (ONU) for a subscriber with an input switching function of the FTTH system of the present invention will be described with reference to FIG. FIG. 1 is used in place of the ONU of the FTTH system shown in FIG. 5. The existing ONU shown in FIG. 6 has a spare signal transmission path 4 capable of transmitting a spare RF signal, and an input side thereof. An input terminal 10 and a switch (RF switch) 5 are added on the output side. The spare signal transmission line 4 transmits a spare RF signal obtained from a system other than the FTTH system, for example, a spare RF signal obtained from the antenna 58 of each individual subscriber shown in FIG. Is to do.

図１のＯＮＵは、ＦＴＴＨシステム（各サービス事業者）から送出された光信号を電気信号（ＲＦ信号）に変換する光／電気変換器（フォトダイオード）ＰＤと、ＣＡＴＶシステムのインピーダンス（通常75Ω）と、それよりも高いＰＤのインピーダンス（数ＫΩ）とを整合するためのインピーダンス変換回路６２と、ＰＤで変換されたＲＦ信号を増幅する増幅器６３とを備え、これらがＦＴＴＨ信号伝送系路２を構成している。また、ＰＤより得られる変換直後のＲＦ信号をモニタ電圧（電流）として取り出して、変換直後のＲＦ信号、即ち、光信号の有無やレベル等の異常を検知する光監視回路３を設けてある。光監視回路３には比較器が使用され、モニタ用に取り出した変換直後のＲＦ信号を予め設定されている基準値と比較して、異常発生時に、異常検知時に警報信号兼用の切替信号を出力して切替器５へ送るようになっている。光監視回路３には図示されていない警報機器、例えば、ＬＥＤとかブザー等が接続されており、それらが警報信号により作動して異常を報知するようにしてある。また、図1では、増幅器６３の出力側に検波回路６を接続し、増幅器６３から出力されるＲＦ信号を検波回路６で検波し、その異常検知時にも光監視回路３から警報信号兼用の切替信号が出力されるようにしてある。図１〜図３のＥは光監視回路３を駆動するための電源である。   The ONU shown in FIG. 1 includes an optical / electrical converter (photodiode) PD that converts an optical signal transmitted from the FTTH system (each service provider) into an electrical signal (RF signal), and an impedance (usually 75Ω) of the CATV system. And an impedance conversion circuit 62 for matching the impedance (several KΩ) of the PD higher than that, and an amplifier 63 for amplifying the RF signal converted by the PD, which are connected to the FTTH signal transmission path 2. It is composed. Further, an optical monitoring circuit 3 is provided that detects an RF signal immediately after conversion obtained from the PD as a monitor voltage (current) and detects an abnormality such as the presence or level of the RF signal immediately after conversion, that is, an optical signal. A comparator is used in the optical monitoring circuit 3, and the RF signal immediately after conversion taken out for monitoring is compared with a preset reference value, and when an abnormality occurs, a switching signal that also serves as an alarm signal is output when an abnormality is detected And sent to the switch 5. The light monitoring circuit 3 is connected to an alarm device (not shown) such as an LED or a buzzer, which operates in response to an alarm signal to notify an abnormality. Further, in FIG. 1, the detection circuit 6 is connected to the output side of the amplifier 63, the RF signal output from the amplifier 63 is detected by the detection circuit 6, and the light monitoring circuit 3 also switches the alarm signal when an abnormality is detected. A signal is output. E in FIGS. 1 to 3 is a power source for driving the optical monitoring circuit 3.

図１のＦＴＴＨシステムの入力切替え機能付き加入者用光受信端末器では、光監視回路３から切替信号が出力されて切替器５に送られると、切替器５がそれまでのＦＴＴＨ信号伝送系路２への接続から予備信号伝送系路４への接続に切替えられて、予備信号伝送系路４に送られるＲＦ信号が切替器５から出力されて加入者に送られるようにしてある。   In the optical receiver terminal for subscribers with an input switching function of the FTTH system of FIG. 1, when a switching signal is output from the optical monitoring circuit 3 and sent to the switching device 5, the switching device 5 is connected to the FTTH signal transmission path up to that time. 2 is switched to the connection to the backup signal transmission line 4, and the RF signal sent to the backup signal transmission line 4 is output from the switch 5 and sent to the subscriber.

（実施形態２）
本発明の第２の実施形態を図２に基づいて説明する。これは加入者用光受信端末器（ＯＮＵ）を二つの機器に分けたものであり、光／電気変換部１と、ＦＴＴＨ信号伝送系路２と、検波回路６と、光監視回路３とを一つの筺体にまとめて一つの送信側機器７とし、切替器５と予備信号伝送系路４とを送信側機器７と別体の筺体にまとめて切替側機器８としてある。切替側機器８にはＦＴＴＨ信号伝送系路２の出力端（ＲＦ出力端）１２を接続するためのＲＦ信号入力端子９と、予備のＲＦ信号を入力するための予備信号入力端子１０と、光監視回路３から出力される切替信号を入力するための入力端子１１とを設けて、ＲＦ信号入力端子９にＦＴＴＨ信号伝送系路の出力端１２を、予備信号入力端子１０に予備のアンテナ、既設共聴施設等のＲＦ信号源を接続することにより、両機器７、８を接続することができるようにしてある。 (Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. This is an optical receiver terminal (ONU) for subscribers divided into two devices. The optical / electrical converter 1, the FTTH signal transmission line 2, the detection circuit 6, and the optical monitoring circuit 3 are provided. The switch 5 and the spare signal transmission path 4 are combined into a separate housing from the transmission device 7 as a switching device 8. An RF signal input terminal 9 for connecting the output terminal (RF output terminal) 12 of the FTTH signal transmission line 2 to the switching side device 8, a spare signal input terminal 10 for inputting a spare RF signal, An input terminal 11 for inputting a switching signal output from the monitoring circuit 3; an output terminal 12 of the FTTH signal transmission line at the RF signal input terminal 9; a spare antenna at the spare signal input terminal 10; Both devices 7 and 8 can be connected by connecting an RF signal source such as a hearing facility.

図２のＯＮＵでも、光監視回路３から出力される信号を切替信号と警報信号の兼用にして、光監視回路３から出力される信号が切替器５へ送られると、切替器５がそれまでのＦＴＴＨ信号伝送系路２への接続から、予備信号伝送系路４への接続に切替えられて、予備信号伝送系路４に送られる予備のＲＦ信号が切替器５から加入者に伝送されるようにしてある。また、検波回路６により検波されたＲＦ信号異常がある場合、光監視回路３から切替信号及び警報信号が出力されて、切替器５が切替えられ、警報機が作動するようにしてある。   In the ONU of FIG. 2, when the signal output from the optical monitoring circuit 3 is used as both a switching signal and an alarm signal and the signal output from the optical monitoring circuit 3 is sent to the switching unit 5, Is switched from the connection to the FTTH signal transmission line 2 to the connection to the spare signal transmission line 4, and the spare RF signal sent to the spare signal transmission line 4 is transmitted from the switch 5 to the subscriber. It is like that. Further, when there is an abnormality in the RF signal detected by the detection circuit 6, a switching signal and an alarm signal are output from the optical monitoring circuit 3, the switch 5 is switched, and the alarm is activated.

（実施形態３）
本発明のＯＮＵの第３の実施形態を図３に基づいて説明する。これもＯＮＵを二つに分けたものであり、光／電気変換部１と、ＦＴＴＨ信号伝送系路２と、光監視回路３とを一つの筺体にまとめて送信側機器とし、切替器５と、予備信号伝送系路４と、検波回路６と、ＲＦ監視回路１４とを送信側機器７と別体の筺体にまとめて切替側機器８としてある。切替側機器８にはＦＴＴＨのＲＦ信号を入力するためのＲＦ信号入力端子９と、予備のＲＦ信号を入力するための予備信号入力端子１０を備えている。ＲＦ信号入力端子９にはＦＴＴＨ信号伝送系路の出力端１２を、予備信号入力端子１０には予備のＲＦ信号源を接続することにより、両機器７、８を接続することができるようにしてある。検波回路６とＲＦ監視回路１４を切替側機器８に設けることで、図２の切替信号入力端子１１に相当するものを無くすることができる。 (Embodiment 3)
A third embodiment of the ONU of the present invention will be described with reference to FIG. This also divides the ONU into two parts. The optical / electrical converter 1, the FTTH signal transmission path 2, and the optical monitoring circuit 3 are combined into one housing as a transmission side device. The auxiliary signal transmission line 4, the detection circuit 6, and the RF monitoring circuit 14 are combined into a separate housing from the transmission side device 7 to form the switching side device 8. The switching-side device 8 includes an RF signal input terminal 9 for inputting an FTTH RF signal and a spare signal input terminal 10 for inputting a spare RF signal. By connecting an output terminal 12 of the FTTH signal transmission line to the RF signal input terminal 9 and a spare RF signal source to the spare signal input terminal 10, both devices 7 and 8 can be connected. is there. By providing the detection circuit 6 and the RF monitoring circuit 14 in the switching-side device 8, it is possible to eliminate what corresponds to the switching signal input terminal 11 in FIG.

図３のＯＮＵでは、ＲＦ監視回路１４を光監視回路３と別に設け、ＲＦ監視回路１４から出力される切替信号が切替器５に送られると、切替器５がそれまでのＦＴＴＨ信号伝送系路２への接続から、予備信号伝送系路４への接続に切替えられて、予備信号伝送系路４を送られるＲＦ信号が切替器５から出力されて、予備のＲＦ信号が加入者に伝送されるようにしてある。   In the ONU of FIG. 3, the RF monitoring circuit 14 is provided separately from the optical monitoring circuit 3, and when the switching signal output from the RF monitoring circuit 14 is sent to the switching device 5, the switching device 5 is connected to the previous FTTH signal transmission path. 2 is switched to the connection to the backup signal transmission system 4 and the RF signal sent through the backup signal transmission system 4 is output from the switch 5 and the backup RF signal is transmitted to the subscriber. It is made to do.

図１〜図３のいずれのＯＮＵの場合も、ＦＴＴＨシステムの異常が回復して光信号又はＲＦ信号が正常になった後は、光監視回路３或いはＲＦ監視回路１４からの切替信号の出力が停止して、切替器５が自動的にＦＴＴＨ信号伝送系路２に復帰し、ＦＴＴＨのＲＦ信号が加入者に送信されるようにしてある。異常回復後の切替器５の切替えは手動で行なうこともできる。   In any of the ONUs of FIGS. 1 to 3, after the abnormality of the FTTH system is recovered and the optical signal or the RF signal becomes normal, the output of the switching signal from the optical monitoring circuit 3 or the RF monitoring circuit 14 is generated. It stops and the switch 5 automatically returns to the FTTH signal transmission line 2 so that the RF signal of FTTH is transmitted to the subscriber. Switching of the switch 5 after recovery from an abnormality can be performed manually.

切替器５には予備ＲＦ信号入力端子１０を設けてあるので、その入力端子１０に接続されるアンテナ（BS・CS・VHF・UHF）に給電できるように切替側機器８に電源重畳機能を持たす必要がある。既設共聴施設などの同軸ケーブルにより信号が引き込まれていて給電の必要がない場合は、給電を切れるようにＯＮ／ＯＦＦスイッチを設けておくのが望ましい。   Since the switch 5 is provided with a spare RF signal input terminal 10, the switching device 8 has a power superimposition function so that power can be supplied to the antenna (BS, CS, VHF, UHF) connected to the input terminal 10. There is a need. When a signal is drawn in by a coaxial cable such as an existing common hearing facility and power supply is not necessary, it is desirable to provide an ON / OFF switch so that power supply is cut off.

本発明のＯＮＵの第１の例を示す説明図。Explanatory drawing which shows the 1st example of ONU of this invention. 本発明のＯＮＵの第２の例を示す説明図。Explanatory drawing which shows the 2nd example of ONU of this invention. 本発明のＯＮＵの第３の一例を示す説明図。Explanatory drawing which shows the 3rd example of ONU of this invention. 現在検討されているＦＴＴＨシステムの一例を示す説明図。Explanatory drawing which shows an example of the FTTH system currently examined. 現在のＨＦＣシステム及び難視聴対策施設の一例を示す説明図。Explanatory drawing which shows an example of the present HFC system and a difficult-to-view countermeasure facility. 従来のＯＮＵの説明図。Explanatory drawing of the conventional ONU.

１ 光／電気変換部
２ ＦＴＴＨ信号伝送系路
３ 光監視回路
４ 予備信号伝送系路
５ 切替器
６ 検波回路
７ 送信側機器
８ 切替側機器
９ ＲＦ信号入力端子
１０ 予備信号入力端子
１１ 切替信号入力端子
１２ ＲＦ出力端
１３ 切替信号出力端
１４ ＲＦ監視回路 DESCRIPTION OF SYMBOLS 1 Optical / electrical conversion part 2 FTTH signal transmission system 3 Optical monitoring circuit 4 Backup signal transmission system 5 Switch 6 Detection circuit 7 Transmission side device 8 Switching side device 9 RF signal input terminal 10 Reserve signal input terminal 11 Switch signal input Terminal 12 RF output terminal 13 Switching signal output terminal 14 RF monitoring circuit

Claims (7)

ＦＴＴＨシステムの光送信機から光伝送路を通して送信される光信号を受信し、その光信号を電気信号（ＲＦ信号）に変換して加入者に送るＦＴＴＨシステムにおける加入者用ＯＮＵにおいて、
ＦＴＴＨシステムにおいて受信した光信号を電気信号に変換する光／電気変換部（１）と、変換されたＲＦ信号を伝送するＦＴＴＨ信号伝送系路（２）と、前記光信号を監視して光信号の異常検出時に切替信号を出力する光監視回路（３）と、ＦＴＴＨシステムとは別である加入者に設置されているアンテナ又はＣＡＴＶによる既設のＲＦ信号源による予備ＲＦ信号源と、その予備ＲＦ信号源からの予備ＲＦ信号を伝送可能な予備信号伝送系路（４）と、予備信号伝送系路（４）と前記ＦＴＴＨ信号伝送系路（２）を切替え可能な切替器（５）と、前記予備ＲＦ信号が入力される予備信号入力端子（１０）を備え、前記予備信号伝送系路（４）は予備信号入力端子（１０）と前記切替器（５）の間に設けられ、
前記光監視回路（３）はＲＦ信号の異常時に前記光監視回路（３）からの出力に基づいて切替信号を出力し
前記切替器（５）は前記光監視回路（３）から送られる前記切替信号に基づいてＦＴＴＨ信号伝送系路（２）から予備信号伝送系路（４）に切替えられると、前記予備ＲＦ信号が前記予備信号伝送系路（４）から加入者に伝送されるようにするものであり、
前記光／電気変換部（１）とＦＴＴＨ信号伝送系路（２）と光監視回路（３）を一つの筺体にまとめて送信側機器（７）とし、
前記切替器（５）と予備信号伝送系路（４）とを前記筺体と別の筺体にまとめて切替側機器（８）とし、
前記送信側機器（７）にＲＦ出力端（１２）と、切替信号出力端（１３）が設けられ、
前記切替側機器（８）にＦＴＴＨシステムのＲＦ信号を入力可能な入力端子（９）と、切替信号入力端子（１１）と、予備ＲＦ信号を入力可能な予備ＲＦ信号入力端子（１０）が設けられ、予備信号伝送系路（４）は予備ＲＦ信号入力端子（１０）と切替器（５）の間に設けられ、
前記送信側機器（７）のＲＦ出力端（１２）と切替側機器（８）のＲＦ信号入力端子（９）が接続・離脱可能であり、前記送信側機器（７）の切替信号出力端（１３）と切替側機器（８）の切替信号入力端子（１１）が接続・離脱可能であり、前記予備ＲＦ信号入力端子（１０）に予備ＲＦ信号源が接続・離脱可能である、
ことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In an ONU for a subscriber in an FTTH system, which receives an optical signal transmitted through an optical transmission line from an optical transmitter of the FTTH system, converts the optical signal into an electrical signal (RF signal), and sends it to the subscriber.
An optical / electrical converter (1) that converts an optical signal received in the FTTH system into an electrical signal, an FTTH signal transmission line (2) that transmits the converted RF signal, and an optical signal by monitoring the optical signal Monitoring circuit (3) that outputs a switching signal when an abnormality is detected, a spare RF signal source by an existing RF signal source by an antenna or CATV installed in a subscriber different from the FTTH system, and its spare RF A backup signal transmission path (4) capable of transmitting a backup RF signal from a signal source; a switch (5) capable of switching between the backup signal transmission path (4) and the FTTH signal transmission path (2); The auxiliary signal input terminal (10) to which the auxiliary RF signal is input is provided, and the auxiliary signal transmission line (4) is provided between the auxiliary signal input terminal (10) and the switch (5),
The optical monitoring circuit (3) outputs a switching signal based on the output from the optical monitoring circuit (3) when the RF signal is abnormal.
When the switch (5) is switched from the FTTH signal transmission path (2) to the backup signal transmission path (4) based on the switching signal sent from the optical monitoring circuit (3), the backup RF signal is To be transmitted to the subscriber from the backup signal transmission line (4),
The optical / electrical converter (1), the FTTH signal transmission line (2), and the optical monitoring circuit (3) are combined into a single housing to form a transmitting device (7).
The switch (5) and the backup signal transmission line (4) are combined into a separate housing from the housing to form a switching device (8).
The transmitter device (7) is provided with an RF output terminal (12) and a switching signal output terminal (13),
The switching device (8) is provided with an input terminal (9) capable of inputting an RF signal of the FTTH system, a switching signal input terminal (11), and a spare RF signal input terminal (10) capable of inputting a spare RF signal. The spare signal transmission line (4) is provided between the spare RF signal input terminal (10) and the switch (5),
The RF output terminal (12) of the transmitting device (7) and the RF signal input terminal (9) of the switching device (8) can be connected and disconnected, and the switching signal output terminal ( 13) and the switching signal input terminal (11) of the switching device (8) can be connected / disconnected, and a spare RF signal source can be connected / detached to / from the spare RF signal input terminal (10).
An ONU for a subscriber with an input switching function in the FTTH system . 請求項１記載のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
ＦＴＴＨシステムの光信号を変換したＲＦ信号を検波する検波回路（６）をも設け、ＲＦ信号の異常時に検波回路（６）からの出力に基づいて光監視回路（３）から切替信号が出力されることを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In the ONU for a subscriber with an input switching function in the FTTH system according to claim 1,
A detection circuit (6) for detecting an RF signal obtained by converting the optical signal of the FTTH system is also provided, and a switching signal is output from the optical monitoring circuit (3) based on the output from the detection circuit (6) when the RF signal is abnormal. An ONU for a subscriber with an input switching function in the FTTH system. 請求項１又は請求項２記載のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
送信側機器（７）に検波回路（６）をも備えたことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In the ONU for a subscriber with an input switching function in the FTTH system according to claim 1 or 2 ,
An ONU for a subscriber with an input switching function in an FTTH system, wherein the transmitter device (7) is also provided with a detection circuit (6). ＦＴＴＨシステムの光送信機から光伝送路を通して送信される光信号を受信し、その光信号を電気信号（ＲＦ信号）に変換して加入者に送るＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
ＦＴＴＨシステムにおいて受信した光信号を電気信号（ＲＦ信号）に変換して加入者に送る光／電気変換部（１）と、変換されたＲＦ信号を伝送するＦＴＴＨ信号伝送系路（２）と、前記光信号を監視して光信号の異常時に警報信号を出力する光監視回路（３）と、前記ＲＦ信号を検波する検波回路（６）と、検波回路（６）でＲＦ信号の異常が検出されると切替信号を出力するＲＦ監視回路（１４）と、ＦＴＴＨシステムとは別である加入者に設置されているアンテナ又はＣＡＴＶによる既設のＲＦ信号源による予備ＲＦ信号源と、予備ＲＦ信号源からの予備ＲＦ信号伝送可能な予備信号伝送系路（４）と、予備信号伝送系路（４）と前記ＦＴＴＨ信号伝送系路（２）を切替え可能な切替器（５）と、予備信号入力端子（１０）を備え、前記予備信号伝送系路（４）は予備信号入力端子（１０）と前記切替器（５）の間に設けられ、
前記切替器（５）は前記ＲＦ監視回路（１４）から送られる前記切替信号に基づいてＦＴＴＨ信号伝送系路（２）から予備信号伝送系路（４）に切替えられて、前記予備ＲＦ信号が前記予備信号伝送系路（４）から加入者に伝送されるようにするものであり、
前記光／電気変換部（１）とＦＴＴＨ信号伝送系路（２）と光監視回路（３）とを一つの筺体にまとめて送信側機器（７）とし、
前記検波回路（６）とＲＦ監視回路（１４）と切替器（５）と予備信号伝送系路（４）とを前記筺体と別の筺体にまとめて切替側機器（８）とし、
前記送信側機器（７）にＲＦ出力端（１２）が設けられ、
前記切替側機器（８）にＦＴＴＨシステムのＲＦ信号を入力可能な入力端子（９）と、予備ＲＦ信号源からの予備ＲＦ信号を入力可能な予備ＲＦ信号入力端子（１０）が設けられ、前記予備信号伝送系路（４）は予備信号入力端子（１０）と前記切替器（５）の間に設けられ、
前記送信側機器（７）のＲＦ出力端（１２）と切替側機器（８）のＲＦ信号入力端子（９）が接続・離脱可能であり、前記予備ＲＦ信号入力端子（１０）に予備ＲＦ信号源が接続・離脱可能である、
ことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In an ONU for a subscriber with an input switching function in an FTTH system that receives an optical signal transmitted through an optical transmission path from an optical transmitter of the FTTH system, converts the optical signal into an electrical signal (RF signal), and sends the signal to a subscriber ,
An optical / electrical converter (1) that converts an optical signal received in the FTTH system into an electrical signal (RF signal) and sends it to a subscriber; an FTTH signal transmission line (2) that transmits the converted RF signal; An optical monitoring circuit (3) that monitors the optical signal and outputs an alarm signal when the optical signal is abnormal, a detection circuit (6) that detects the RF signal, and an abnormal RF signal detected by the detection circuit (6) An RF monitoring circuit (14) for outputting a switching signal, an antenna installed in a subscriber different from the FTTH system, a spare RF signal source by an existing RF signal source by CATV, and a spare RF signal source A spare signal transmission line (4) capable of transmitting a spare RF signal from the switch, a switch (5) capable of switching between the spare signal transmission line (4) and the FTTH signal transmission line (2), and a spare signal input With terminal (10), front Preliminary signal transmission path (4) is provided between the switch and the pre-signal input terminal (10) (5),
The switch (5) is switched from the FTTH signal transmission path (2) to the backup signal transmission path (4) based on the switching signal sent from the RF monitoring circuit (14), and the backup RF signal is transmitted. To be transmitted to the subscriber from the backup signal transmission line (4),
The optical / electrical converter (1), the FTTH signal transmission line (2), and the optical monitoring circuit (3) are combined into a single housing to form a transmission side device (7).
The detection circuit (6), the RF monitoring circuit (14), the switch (5), and the spare signal transmission line (4) are combined into a separate housing and the switching device (8),
The transmitting device (7) is provided with an RF output end (12),
And the switching side device (8) can be input RF signal FTTH system input terminal (9), pre RF signal can be input pre RF signal input terminal (10) from the preliminary RF signal source is provided, wherein The spare signal transmission line (4) is provided between the spare signal input terminal (10) and the switch (5),
The RF output terminal (12) of the transmission side device (7) and the RF signal input terminal (9) of the switching side device (8) can be connected and disconnected, and a spare RF signal is connected to the spare RF signal input terminal (10). The source can be connected and disconnected,
An ONU for a subscriber with an input switching function in the FTTH system. 請求項１乃至請求項４のいずれかに記載のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
切替器（５）はＦＴＴＨシステムの異常が回復して光信号またはそれを変換したＲＦ信号が回復すると、光監視回路（３）或いはＲＦ監視回路（１４）からの切替信号の出力が停止して切替器（５）が予備信号伝送系路（４）からＦＴＴＨ信号伝送系路（２）に切替えられて、ＦＴＴＨシステムのＲＦ信号が加入者に伝送される
ことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In the ONU for a subscriber with an input switching function in the FTTH system according to any one of claims 1 to 4 ,
When the abnormality of the FTTH system is recovered and the optical signal or the converted RF signal is recovered, the switch (5) stops outputting the switching signal from the optical monitoring circuit (3) or the RF monitoring circuit (14). Input switching in the FTTH system, characterized in that the switch (5) is switched from the backup signal transmission path (4) to the FTTH signal transmission path (2) and the RF signal of the FTTH system is transmitted to the subscriber. ONU for subscribers with functions. 請求項１乃至請求項４のいずれかに記載のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
光監視回路（３）から出力される切替信号が警報信号兼用である、
ことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In the ONU for a subscriber with an input switching function in the FTTH system according to any one of claims 1 to 4,
The switching signal output from the light monitoring circuit (3) is also used as an alarm signal.
An ONU for a subscriber with an input switching function in the FTTH system. 請求項１乃至請求項６のいずれかに記載のＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵにおいて、
切替側機器（８）が予備ＲＦ信号入力端子（１０）に接続されるアンテナに給電をＯＮ／ＯＦＦできる電源重畳機能を備えた、
ことを特徴とするＦＴＴＨシステムにおける入力切替え機能付き加入者用ＯＮＵ。 In the ONU for a subscriber with an input switching function in the FTTH system according to any one of claims 1 to 6 ,
The switching side device (8) has a power superimposing function that can turn on / off the power supply to the antenna connected to the spare RF signal input terminal (10).
An ONU for a subscriber with an input switching function in the FTTH system.
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