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.
JP2003416392A 2003-12-15 2003-12-15 ONU for subscribers with input switching function in FTTH system Expired - Fee Related JP4564745B2 (en)

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