JP3898096B2

JP3898096B2 - Wavelength multiplex transmission equipment

Info

Publication number: JP3898096B2
Application number: JP2002184920A
Authority: JP
Inventors: 幹夫南雲
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-06-25
Filing date: 2002-06-25
Publication date: 2007-03-28
Anticipated expiration: 2022-06-25
Also published as: JP2004032306A

Description

【０００１】
【発明の属する技術分野】
この発明は、現用系、予備系のプロテクション切替制御を行う波長多重伝送装置に関するものである。
【０００２】
【従来の技術】
図４は従来の波長多重伝送装置の構成を示すブロック図である。
図４において、１０１は０系および１系の冗長化された伝送路に接続された波長多重伝送装置、１０２は０系波長変換部１〜ｎ，１０３は１系波長変換部１〜ｎ，１０４は０系波長光を合波する０系光合波部、１０５は０系多重光を分波する０系光分波部、１０６は１系波長光を合成する１系光合波部、１０７は１系多重光を分波する１系光分波部、１０８は０系多重光を光増幅し０系伝送路１１２へ出力する０系光増幅部、１０９は０系伝送路１１３から入力された多重光を光増幅し０系光分波部１０５へ出力する０系光増幅部、１１０は１系多重光を増幅し１系伝送路１１４へ出力する１系光増幅部、１１１は１系伝送路１１５から入力された多重光を光増幅し１系光分波部１０７へ出力する１系光増幅部である。
【０００３】
また、図４において、１１２は波長多重伝送装置１０１から他の波長多重伝送装置への０系伝送路、１１３は他の波長多重伝送装置から波長多重伝送装置１０１への０系伝送路、１１４は波長多重伝送装置１０１から他の波長多重伝送装置への１系伝送路、１１５は他の波長多重伝送装置から波長多重伝送装置１０１への１系伝送路である。
【０００４】
さらに、図４において、１１６は冗長している波長変換部のプロテクション切替を行うプロテクション制御部、１２４ａはプロテクション制御部１１６から０系波長変換部１０２へ現用系／予備系切替コマンドを送る０系制御信号、１２４ｂは０系波長変換部１０２からプロテクション制御部１１６への切替要因発生通知を行う０系状態信号、１２５ａはプロテクション制御部１１６から１系波長変換部１０３へ現用系／予備系切替コマンドを送る１系制御信号、１２５ｂは１系波長変換部１０３からプロテクション制御部１１６への切替要因発生通知を行う１系状態信号、１１９は外部装置からの光信号を０系波長変換部１０２および１系波長変換部１０３へ分配し、かつ０系波長変換部１０２および１系波長変換部１０３からの光信号を合成する光カプラ部である。
【０００５】
次に動作について説明する。
外部装置からの光信号は、光カプラ部１１９で分配され、０系波長変換部１０２および１系波長変換部１０３へ入力される。０系波長変換部１０２により変換されたｎ個の波長光は、０系光合波部１０４で合波された後、０系光増幅部１０８で増幅され、０系伝送路１１２を介して、波長多重伝送装置１０１から他の波長多重伝送装置へ伝送される。また、０系伝送路１１３を介して他の波長多重伝送装置から波長多重伝送装置１０１へ伝送されてきた波長多重光は、０系光増幅部１０９で増幅され、０系光分波部１０５でｎ個の波長光へ分波される。各波長光は、０系波長変換部１０２で波長変換され、光カプラ部１１９を介して外部装置へ出力される。
【０００６】
同様に、１系波長変換部１０３により変換されたｎ個の波長光は、１系光合波部１０６で合波された後、１系光増幅部１１０で増幅され、１系伝送路１１４を介して、波長多重伝送装置１０１から他の波長多重伝送装置へ伝送される。また同様に、１系伝送路１１５を介して他の波長多重伝送装置から波長多重伝送装置１０１へ伝送されてきた波長多重光は、１系光増幅部１１１で増幅され、１系光分波部１０７でｎ個の波長光へ分波される。各波長光は、１系波長変換部１０３で波長変換され、光カプラ部１１９を介して外部装置へ出力される。
【０００７】
０系波長変換部１０２および１系波長変換部１０３から光カプラ部１１９への光信号は同じ信号であり、いずれかの信号のみ出力される。プロテクション制御部１１６は、０系波長変換部１０２および１系波長変換部１０３からの０系状態信号１２４ｂ，１系状態信号１２５ｂにより、伝送路障害、故障等の切替発生要因の有無を監視し、０系制御信号１２４ａ，１系制御信号１２５ａによって、切替要因が有る系へ予備系切替コマンドを、切替要因が無い系へ現用系切替コマンドを０系波長変換部１０２および１系波長変換部１０３へ送出する。予備系切替コマンドを受信した波長変換部は、光カプラ部１１９への光出力のシャットダウンを実行する。逆に、現用系切替コマンドを受信した波長変換部は、光カプラ部１１９への光出力シャットダウンを解除する。
【０００８】
【発明が解決しようとする課題】
従来の波長多重伝送装置は以上のように構成されているので、装置立ち上がり時に両系の切替要因発生通知が無い場合には例えば０系が現用系となり、プロテクション制御部の交換等で一度抜いてから活線挿入したときに０系が現用系である場合には問題無いが、１系が現用系であるときには０系への不要な切替が発生してしまうという課題があった。
【０００９】
例えば図４において、０系が予備系、１系が現用系で運用、いずれも障害なしの場合を考える。交換用のプロテクション制御部１１６の初期設定が０系⇒現用系、１系⇒予備系となっていると、古いプロテクション制御部１１６を抜去して新しいプロテクション制御部１１６を挿入した際に、０系が予備系から現用系に、１系が現用系から予備系に切り替わって、データの瞬断が発生してしまうことになる。逆に、０系が現用系、１系が予備系で運用、いずれも障害なしの場合であっても、交換用のプロテクション制御部１１６の初期設定が０系⇒予備系、１系⇒現用系となっていれば、同様の結果に陥る。
【００１０】
この発明は上記のような課題を解決するためになされたもので、プロテクション制御部の交換等で抜去後に活線挿入したときに、０系、１系いずれが現用系であっても不要な切替の発生を回避する波長多重伝送装置を得ることを目的とする。
【００１１】
【課題を解決するための手段】
この発明に係る波長多重伝送装置は、プロテクション制御手段が、０系伝送手段および１系伝送手段へ現用系／予備系切替コマンドを送出するとともに、０系伝送手段および１系伝送手段からの現用系／予備系切替コマンド情報と切替要因発生通知とに応じてプロテクション切替を決定し、０系伝送手段および１系伝送手段が、切替要因発生通知とともに、プロテクション制御手段から受けた現用系／予備系切替コマンドを現用系／予備系切替コマンド情報としてプロテクション制御手段へ送り返し続けるようにしたものである。
【００１２】
この発明に係る波長多重伝送装置は、プロテクション制御手段が、現用系／予備系切替コマンドにＣＲＣコードを付加して、０系伝送手段および１系伝送手段へ送出するとともに、０系伝送手段および１系伝送手段が、切替要因発生通知、現用系／予備系切替コマンド情報およびＣＲＣコードをプロテクション制御手段へ送り返すようにしたものである。
【００１３】
この発明に係る波長多重伝送装置は、０系伝送手段および１系伝送手段が、２つ以上の切替要因発生通知と、現用系／予備系切替コマンド情報およびＣＲＣコードとをプロテクション制御手段へ送り返すようにしたものである。
【００１４】
【発明の実施の形態】
以下、この発明の実施の一形態を説明する。
実施の形態１．
図１はこの発明の実施の形態１による波長多重伝送装置の構成を示すブロック図である。
図１において、１は０系および１系の冗長化された伝送路に接続された波長多重伝送装置、２は０系波長変換部１〜ｎ（０系伝送手段）、３は１系波長変換部１〜ｎ（１系伝送手段）、４は０系波長光を合波する０系光合波部（０系伝送手段）、５は０系多重光を分波する０系光分波部（０系伝送手段）、６は１系波長光を合成する１系光合波部（１系伝送手段）、７は１系多重光を分波する１系光分波部（１系伝送手段）、８は０系多重光を光増幅し０系伝送路１２へ出力する０系光増幅部（０系伝送手段）、９は０系伝送路１３から入力された多重光を光増幅し０系光分波部５へ出力する０系光増幅部（０系伝送手段）、１０は１系多重光を増幅し１系伝送路１４へ出力する１系光増幅部（１系伝送手段）、１１は１系伝送路１５から入力された多重光を光増幅し１系光分波部７へ出力する１系光増幅部（１系伝送手段）である。
【００１５】
また、図１において、１２は波長多重伝送装置１から他の波長多重伝送装置への０系伝送路、１３は他の波長多重伝送装置から波長多重伝送装置１への０系伝送路、１４は波長多重伝送装置１から他の波長多重伝送装置への１系伝送路、１５は他の波長多重伝送装置から波長多重伝送装置１への１系伝送路である。
【００１６】
さらに、図１において、１６は冗長している波長変換部のプロテクション切替を行うプロテクション制御部（プロテクション制御手段）、１７ａはプロテクション制御部１６から０系波長変換部２へ現用系／予備系切替コマンドを送る０系制御信号、１７ｂは０系波長変換部２からプロテクション制御部１６への切替要因発生通知および現用系／予備系切替コマンド情報を送る０系状態信号、１８ａはプロテクション制御部１６から１系波長変換部３へ現用系／予備系切替コマンドを送る１系制御信号、１８ｂは１系波長変換部３からプロテクション制御部１６への切替要因発生通知および現用系／予備系切替コマンド情報を送る１系状態信号である。そして、１９は外部装置からの光信号を０系波長変換部２および１系波長変換部３へ分配し、かつ０系波長変換部２および１系波長変換部３からの光信号を合成する光カプラ部である。
【００１７】
プロテクション制御の動作について次に説明する。
プロテクション制御部１６は、０系波長変換部２および１系波長変換部３からの切替要因発生通知とともに、０系波長変換部２および１系波長変換部３がプロテクション制御部１６から現用系／予備系切替コマンドを受信して送り返した現用系／予備系切替コマンド情報（各系における現用系／予備系の運用系を表す情報）を、０系状態信号１７ｂ，１系状態信号１８ｂを介して監視している。０系、１系いずれかの系で伝送路障害、故障等が発生すると、０系波長変換部２または１系波長変換部３は、切替要因発生通知をプロテクション制御部１６へ送出する。プロテクション制御部１６は、切替要因発生通知を送出した系に予備系切替コマンドを、切替要因発生通知の無い系に現用系切替コマンドを、０系制御信号１７ａ，１系制御信号１８ａを介して出力する。０系波長変換部２および１系波長変換部３は、受信した現用系／予備系切替コマンドを現用系／予備系切替コマンド情報として０系状態信号１７ｂ，１系状態信号１８ｂを介してプロテクション制御部１６へ送り返す。
【００１８】
例えば０系が予備系、１系が現用系で運用、いずれも障害なしの場合を考える。交換前のプロテクション制御部１６は、０系の波長変換部２へ予備系切替コマンドを、１系の波長変換部３へ現用系切替コマンドを送出している。両系とも障害無しなので、両系の各波長変換部２，３は、切替要因発生通知無しをプロテクション制御部１６へ送信している。さらに、この切替要因発生通知無しに加えて、０系波長変換部２は、プロテクション制御部１６からの予備系切替コマンドを予備系切替コマンド情報としてプロテクション制御部１６へ送り返し、１系波長変換部３は、プロテクション制御部１６からの現用系切替コマンドを現用系切替コマンド情報としてプロテクション制御部１６へ送り返している。
【００１９】
０系波長変換部２，１系波長変換部３は、プロテクション制御部１６を交換する際にも、この交換時に受信している現用系／予備系切替コマンド情報を保持して送り返し続ける。従来と異なり、交換用のプロテクション制御部１６の初期設定は、両系の波長変換部から送り返し続けられている現用系／予備系切替コマンド情報によって決定されるようになっている。したがって、抜去・挿入後の新しいプロテクション制御部１６は、０系波長変換部２からの予備系切替コマンド情報を受けて０系をそのまま予備系に設定し、同様に、１系波長変換部３からの現用系切替コマンド情報を受けて１系を現用系にそのまま設定する。したがって、交換前後で現用・予備両系の不要な切替が発生せず、データの瞬断を回避できる。
【００２０】
以上のように、この実施の形態１によれば、プロテクション制御部１６が、０系波長変換部２および１系波長変換部３へ０系制御信号１７ａ，１系制御信号１８ａによって現用系／予備系切替コマンドを送出するとともに、０系波長変換部２および１系波長変換部３からの現用系／予備系切替コマンド情報と切替要因発生通知とに応じてプロテクション切替を決定し、０系波長変換部２および１系波長変換部３が、切替要因発生通知とともに、プロテクション制御部１６から受けた現用系／予備系切替コマンドを現用系／予備系切替コマンド情報として０系状態信号１７ｂ，１系状態信号１８ｂによってプロテクション制御部１６へ送り返し続けるようにしたので、０系、１系いずれの系が現用系であっても不要な切替を発生することなく、プロテクション制御部交換時の活線抜去、挿入を行うことができるという効果が得られる。
【００２１】
実施の形態２．
実施の形態１では、０系制御信号１７ａ，１系制御信号１８ａに現用系／予備系切替コマンドを、０系状態信号１７ｂ，１系状態信号１８ｂに切替要因発生通知および現用系／予備系切替コマンド情報を送出したが、これらにＣＲＣ（“ＣｙｃｌｉｃＲｅｄｕｎｄａｎｃｙＣｈｅｃｋ”，巡回冗長検査）コードを付加しても良く、プロテクション制御部および波長変換部の活線での抜去、挿入時のデータ誤りによる不要な切替を回避するためのデータの保護回路を無くし、遅延時間を削減することができる。
【００２２】
図２はこの発明の実施の形態２による波長多重伝送装置の構成を示すブロック図であり、０系波長変換部２，１系波長変換部３，プロテクション制御部１６だけを特に図示している。図２（ａ）において、２０ａは０系制御信号、２０ｂは０系状態信号、２１ａは１系制御信号、２１ｂは１系状態信号である。
【００２３】
図２（ｂ）に示すように、０系制御信号２０ａ，１系制御信号２１ａには、現用系／予備系切替コマンドおよびＣＲＣコードが、０系状態信号２０ｂ，１系状態信号２１ｂには、切替要因発生通知、現用系／予備系切替コマンド情報およびＣＲＣコードが伝送されており、上述の遅延時間の削減が可能になっている。なお、図２（ｂ）中のＢＬＡＮＫは必ずしも必要ではない。
【００２４】
以上のように、この実施の形態２によれば、プロテクション制御部１６が、現用系／予備系切替コマンドにＣＲＣコードを付加して、０系制御信号２０ａおよび１系制御信号２１ａによって０系波長変換部２および１系波長変換部３へ送出するとともに、０系波長変換部２および１系波長変換部３が、切替要因発生通知、現用系／予備系切替コマンド情報およびＣＲＣコードを０系状態信号２０ｂおよび１系状態信号２１ｂによってプロテクション制御部１６へ送り返すようにしたので、プロテクション制御部１６の抜去、挿入時のデータ誤りを回避するための保護回路を無くし、切替遅延時間を削減できるという効果が得られる。
【００２５】
実施の形態３．
実施の形態２では、０系状態信号２０ｂ，１系状態信号２１ｂに切替要因発生通知、現用系／予備系切替コマンド情報、ＣＲＣコードを送出したが、切替要因発生通知を優先度に応じて２種類以上のコードを送出しても良く、両系に障害が発生しているような場合に、より細かくプロテクション切替制御を行うことができる。
【００２６】
図３はこの発明の実施の形態３による波長多重伝送装置の構成を示すブロック図であり、０系波長変換部２，１系波長変換部３，プロテクション制御部１６だけを特に図示している。図３（ａ）において、２２ａは０系制御信号、２２ｂは０系状態信号、２３ａは１系制御信号、２３ｂは１系状態信号である。
【００２７】
図３（ｂ）に示すように、０系制御信号２２ａ，１系制御信号２３ａには、現用系／予備系切替コマンドおよびＣＲＣコードが、０系状態信号２２ｂ，１系状態信号２３ｂには、切替要因発生通知１，切替要因発生通知２，現用系／予備系切替コマンド情報およびＣＲＣコードが伝送される。例えば、０系波長変換部２および１系波長変換部３には複数チャネルが多重されており、０系波長変換部２には１つのチャネルの障害が発生した場合には、１系波長変換部３を現用系とするが、その後１系波長変換部３に全チャネルの障害が発生した場合には、０系波長変換部２に切り戻す等が可能である。なお、図３（ｂ）中のＢＬＡＮＫは必ずしも必要ではない。
【００２８】
以上のように、この実施の形態３によれば、０系波長変換部２および１系波長変換部３が、２つ以上の切替要因発生通知と、現用系／予備系切替コマンド情報およびＣＲＣコードとを０系状態信号２２ｂおよび１系状態信号２３ｂによってプロテクション制御部１６へ送り返すようにしたので、波長変換部が複数チャネルを多重している場合に、例えば１チャネルの障害と全チャネルの障害とで優先度をつけたプロテクション切替が制御できるという効果が得られる。
【００２９】
【発明の効果】
以上のように、この発明によれば、プロテクション制御手段が、０系伝送手段および１系伝送手段へ現用系／予備系切替コマンドを送出するとともに、０系伝送手段および１系伝送手段からの現用系／予備系切替コマンド情報と切替要因発生通知とに応じてプロテクション切替を決定し、０系伝送手段および１系伝送手段が、切替要因発生通知とともに、プロテクション制御手段から受けた現用系／予備系切替コマンドを現用系／予備系切替コマンド情報としてプロテクション制御手段へ送り返し続けるようにしたので、０系、１系いずれの系が現用系であっても不要な切替を発生することなく、プロテクション制御部交換時の活線抜去、挿入を行うことができるという効果が得られる。
【図面の簡単な説明】
【図１】この発明の実施の形態１による波長多重伝送装置の構成を示すブロック図である。
【図２】この発明の実施の形態２による波長多重伝送装置の構成を示すブロック図である。
【図３】この発明の実施の形態３による波長多重伝送装置の構成を示すブロック図である。
【図４】従来の波長多重伝送装置の構成を示すブロック図である。
【符号の説明】
１波長多重伝送装置、２０系波長変換部１〜ｎ（０系伝送手段）、３１系波長変換部１〜ｎ（１系伝送手段）、４０系光合波部（０系伝送手段）、５０系光分波部（０系伝送手段）、６１系光合波部（１系伝送手段）、７１系光分波部（１系伝送手段）、８０系光増幅部（０系伝送手段）、９０系光増幅部（０系伝送手段）、１０１系光増幅部（１系伝送手段）、１１１系光増幅部（１系伝送手段）、１２０系伝送路、１３０系伝送路、１４１系伝送路、１５１系伝送路、１６プロテクション制御部（プロテクション制御手段）、１７ａ０系制御信号、１７ｂ０系状態信号、１８ａ１系制御信号、１８ｂ１系状態信号、１９光カプラ部、２０ａ０系制御信号、２０ｂ０系状態信号、２１ａ１系制御信号、２１ｂ１系状態信号、２２ａ０系制御信号、２２ｂ０系状態信号、２３ａ１系制御信号、２３ｂ１系状態信号。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wavelength division multiplex transmission apparatus that performs protection switching control between an active system and a standby system.
[0002]
[Prior art]
FIG. 4 is a block diagram showing a configuration of a conventional wavelength division multiplexing transmission apparatus.
In FIG. 4, reference numeral 101 denotes a wavelength multiplexing transmission device connected to the redundant transmission lines of the 0 system and 1 system, 102 denotes the 0 system wavelength conversion units 1 to n, and 103 denotes the 1 system wavelength conversion units 1 to n, 104. Is a 0-system optical multiplexing unit for multiplexing 0-system wavelength light, 105 is a 0-system optical demultiplexing unit for demultiplexing 0-system multiplexed light, 106 is a 1-system optical multiplexing unit for combining 1-system wavelength light, and 107 is 1 A 1-system optical demultiplexing unit that demultiplexes system-multiplexed light, 108 is a 0-system optical amplification unit that optically amplifies 0-system multiplexed light and outputs it to the 0-system transmission line 112, and 109 is a multiplexing input from the 0-system transmission line 113. A 0-system optical amplifier that amplifies light and outputs it to the 0-system optical demultiplexing unit 105, 110 is a 1-system optical amplifier that amplifies 1-system multiplexed light and outputs it to the 1-system transmission line 114, and 111 is a 1-system transmission line 1 is a 1-system optical amplification unit that optically amplifies the multiplexed light input from 115 and outputs the amplified light to the 1-system optical demultiplexing unit 107.
[0003]
In FIG. 4, reference numeral 112 denotes a 0-system transmission path from the wavelength multiplexing transmission apparatus 101 to another wavelength multiplexing transmission apparatus, 113 denotes a 0-system transmission path from another wavelength multiplexing transmission apparatus to the wavelength multiplexing transmission apparatus 101, and 114 denotes A system 1 transmission line from the wavelength division multiplex transmission apparatus 101 to another wavelength multiplex transmission apparatus, and 115 is a system 1 transmission line from the other wavelength multiplex transmission apparatus 101 to the wavelength multiplex transmission apparatus 101.
[0004]
In FIG. 4, reference numeral 116 denotes a protection control unit that performs protection switching of redundant wavelength conversion units, and reference numeral 124a denotes a 0-system control that sends a working / standby switching command from the protection control unit 116 to the 0-system wavelength conversion unit 102. A signal 124b is a 0-system state signal for notifying the occurrence of a switching factor from the 0-system wavelength converter 102 to the protection controller 116, and 125a is an active / standby system switch command from the protection controller 116 to the 1-system wavelength converter 103. 1-system control signal to be sent, 125b is a 1-system status signal for notifying occurrence of switching factors from the 1-system wavelength converter 103 to the protection controller 116, 119 is an optical signal from an external device, and the 0-system wavelength converters 102 and 1 Optical signals from the 0-system wavelength converter 102 and the 1-system wavelength converter 103 are distributed to the wavelength converter 103. An optical coupler unit that formed.
[0005]
Next, the operation will be described.
The optical signal from the external device is distributed by the optical coupler unit 119 and input to the 0-system wavelength conversion unit 102 and the 1-system wavelength conversion unit 103. The n wavelengths of light converted by the 0-system wavelength converter 102 are combined by the 0-system optical combiner 104, amplified by the 0-system optical amplifier 108, and then transmitted through the 0-system transmission path 112. The data is transmitted from the multiplex transmission apparatus 101 to another wavelength multiplex transmission apparatus. Also, the wavelength multiplexed light transmitted from the other wavelength multiplexing transmission apparatus 101 to the wavelength multiplexing transmission apparatus 101 via the 0 system transmission path 113 is amplified by the 0 system optical amplifying unit 109 and is transmitted by the 0 system optical demultiplexing unit 105. It is demultiplexed into n wavelength lights. Each wavelength light is wavelength-converted by the 0-system wavelength conversion unit 102 and output to an external device via the optical coupler unit 119.
[0006]
Similarly, n wavelength lights converted by the 1-system wavelength converter 103 are combined by the 1-system optical combiner 106, amplified by the 1-system optical amplifier 110, and then passed through the 1-system transmission path 114. Thus, the signal is transmitted from the wavelength multiplexing transmission apparatus 101 to another wavelength multiplexing transmission apparatus. Similarly, the wavelength multiplexed light transmitted from the other wavelength multiplexing transmission apparatus 101 to the wavelength multiplexing transmission apparatus 101 via the system 1 transmission path 115 is amplified by the system 1 optical amplifying unit 111, and the system 1 optical demultiplexing unit. In 107, the light is demultiplexed into light of n wavelengths. Each wavelength light is wavelength-converted by the 1-system wavelength conversion unit 103 and output to an external device via the optical coupler unit 119.
[0007]
The optical signals from the 0-system wavelength conversion unit 102 and the 1-system wavelength conversion unit 103 to the optical coupler unit 119 are the same signal, and only one of the signals is output. The protection control unit 116 monitors the presence / absence of a switching occurrence factor such as a transmission path failure and a failure by the 0 system state signal 124b and the 1 system state signal 125b from the 0 system wavelength conversion unit 102 and the 1 system wavelength conversion unit 103, Based on the 0-system control signal 124a and the 1-system control signal 125a, the standby system switching command is sent to the system having the switching factor, and the working system switching command is sent to the system having no switching factor to the 0-system wavelength conversion unit 102 and the 1-system wavelength conversion unit 103. Send it out. The wavelength conversion unit that has received the standby system switching command executes shutdown of the optical output to the optical coupler unit 119. Conversely, the wavelength conversion unit that has received the active system switching command cancels the optical output shutdown to the optical coupler unit 119.
[0008]
[Problems to be solved by the invention]
Since the conventional wavelength division multiplexing transmission apparatus is configured as described above, when there is no notification of occurrence of switching factors of both systems when the apparatus starts up, for example, system 0 becomes the active system, and is removed once by replacing the protection control unit, etc. There is no problem when the 0 system is the active system when the hot line is inserted from 1 to 4, but there is a problem that unnecessary switching to the 0 system occurs when the 1 system is the active system.
[0009]
For example, in FIG. 4, a case is considered where the 0 system is a standby system and the 1 system is operated in the active system, and there is no failure. If the initial setting of the replacement protection control unit 116 is 0 system → active system, 1 system → standby system, when the old protection control unit 116 is removed and a new protection control unit 116 is inserted, the 0 system Is switched from the standby system to the active system, and the first system is switched from the active system to the standby system, resulting in an instantaneous data interruption. On the other hand, the initial setting of the protection control unit 116 for replacement is 0 system-> standby system, 1 system-> active system, even if 0 system is the active system, 1 system is operating in the standby system, and there are no failures If it is, it will fall into the same result.
[0010]
The present invention has been made to solve the above-described problems. When the hot line is inserted after removal by replacement of the protection control unit or the like, unnecessary switching is performed regardless of whether the 0 system or the 1 system is the active system. An object of the present invention is to obtain a wavelength division multiplex transmission apparatus that avoids the occurrence of the above.
[0011]
[Means for Solving the Problems]
In the wavelength division multiplexing transmission apparatus according to the present invention, the protection control means sends an active / standby system switch command to the 0-system transmission means and the 1-system transmission means, and the active system from the 0-system transmission means and the 1-system transmission means. / Protection system switching command information and switching factor occurrence notification determine protection switching, and the 0-system transmission means and 1-system transmission means receive the switching factor occurrence notification from the protection control means and switch the working system / protection system The command is continuously sent back to the protection control means as active / standby switching command information.
[0012]
In the wavelength division multiplexing transmission apparatus according to the present invention, the protection control means adds a CRC code to the active / standby switching command and sends it to the 0-system transmission means and the 1-system transmission means. The system transmission means sends back the switching factor occurrence notification, the active / standby system switching command information, and the CRC code to the protection control means.
[0013]
In the wavelength division multiplex transmission apparatus according to the present invention, the 0-system transmission means and the 1-system transmission means send back two or more switching factor occurrence notifications, the active / standby system switching command information, and the CRC code to the protection control means. It is a thing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1 is a block diagram showing the configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 1 of the present invention.
In FIG. 1, 1 is a wavelength division multiplexing transmission device connected to 0-system and 1-system redundant transmission lines, 2 is a 0-system wavelength converter 1 to n (0-system transmission means), and 3 is a 1-system wavelength converter. 1 to n (1 system transmission means), 4 is a 0 system optical multiplexing section (0 system transmission means) for multiplexing 0 system wavelength light, and 5 is a 0 system optical demultiplexing section (for demultiplexing 0 system multiplexed light). (System 0 transmission means), 6 is a system 1 optical multiplexing section (system 1 transmission means) for synthesizing system 1 wavelength light, 7 is a system 1 optical demultiplexing section (system 1 transmission means) for demultiplexing system 1 multiplexed light, Reference numeral 8 denotes a 0-system optical amplifying unit (0-system transmission means) that optically amplifies 0-system multiplexed light and outputs it to the 0-system transmission path 12, and 9 optically amplifies the multiplexed light input from the 0-system transmission path 13 A 0-system optical amplifying section (0-system transmission means) that outputs to the demultiplexing section 5, a 1-system optical amplification section (1-system transmission means) that amplifies 1-system multiplexed light and outputs it to the 1-system transmission path 14, 11 Enter from 1-system transmission line 15 It has been a 1-system optical amplifying section for outputting the multiplexed light to the optical amplifier 1 based optical demultiplexing section 7 (1-system transmission means).
[0015]
In FIG. 1, reference numeral 12 denotes a 0-system transmission path from the wavelength multiplexing transmission apparatus 1 to another wavelength multiplexing transmission apparatus, 13 denotes a 0-system transmission path from another wavelength multiplexing transmission apparatus to the wavelength multiplexing transmission apparatus 1, and 14 denotes A 1-system transmission line from the wavelength multiplexing transmission apparatus 1 to another wavelength multiplexing transmission apparatus, and 15 is a 1-system transmission path from the other wavelength multiplexing transmission apparatus to the wavelength multiplexing transmission apparatus 1.
[0016]
Further, in FIG. 1, 16 is a protection control unit (protection control means) for performing protection switching of redundant wavelength conversion units, and 17a is an active / standby system switching command from the protection control unit 16 to the 0-system wavelength conversion unit 2. 0 system control signal 17b, 17b is a 0 system status signal for transmitting a switch factor generation notification from the 0 system wavelength conversion unit 2 to the protection control unit 16 and active / standby system switch command information, and 18a is 1 from the protection control unit 16. A 1-system control signal for sending an active / standby system switch command to the system wavelength converter 3, 18 b sends a switch factor generation notification and active / standby system switch command information from the 1-system wavelength converter 3 to the protection controller 16. 1 system state signal. Reference numeral 19 denotes a light for distributing the optical signal from the external device to the 0-system wavelength converter 2 and the 1-system wavelength converter 3 and combining the optical signals from the 0-system wavelength converter 2 and the 1-system wavelength converter 3. It is a coupler part.
[0017]
The operation of protection control will be described next.
The protection control unit 16 sends the switching factor generation notification from the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3, and the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 from the protection control unit 16 to the active / standby system. The active / standby switching command information (information indicating the working / standby operating system in each system) received and sent back by the system switching command is monitored via the 0 system status signal 17b and the 1 system status signal 18b. is doing. When a transmission line failure or failure occurs in either the 0-system or the 1-system, the 0-system wavelength conversion unit 2 or the 1-system wavelength conversion unit 3 sends a switching factor generation notification to the protection control unit 16. The protection control unit 16 outputs the standby system switching command to the system that has sent the switching factor occurrence notification and the active system switching command to the system that has no switching factor occurrence notification via the 0-system control signal 17a and the 1-system control signal 18a. To do. The 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 perform protection control via the 0-system state signal 17b and the 1-system state signal 18b using the received active / protection system switch command as active / protection system switch command information. Send back to section 16.
[0018]
For example, let us consider a case where the 0 system is a standby system and the 1 system is operated as an active system, and there is no failure. The protection control unit 16 before replacement sends a standby system switch command to the 0-system wavelength converter 2 and an active system switch command to the 1-system wavelength converter 3. Since there is no failure in both systems, the wavelength conversion units 2 and 3 in both systems transmit no switching factor occurrence notification to the protection control unit 16. Further, in addition to the notification of the occurrence of the switching factor, the 0-system wavelength converter 2 sends back the protection system switching command from the protection controller 16 to the protection controller 16 as protection system switching command information, and the 1-system wavelength converter 3 Sends the active system switch command from the protection control unit 16 back to the protection control unit 16 as active system switch command information.
[0019]
When the protection control unit 16 is replaced, the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 hold and send back the active / standby system switching command information received at the time of the replacement. Unlike the prior art, the initial setting of the replacement protection control unit 16 is determined by the active / standby switching command information that is continuously sent back from the wavelength converters of both systems. Therefore, the new protection control unit 16 after removal / insertion receives the standby system switching command information from the 0-system wavelength conversion unit 2 and sets the 0-system as it is as the standby system. Similarly, from the 1-system wavelength conversion unit 3 1 system is set as the active system as it is. Therefore, unnecessary switching between the active and standby systems does not occur before and after replacement, and data interruption can be avoided.
[0020]
As described above, according to the first embodiment, the protection control unit 16 sends the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 to the active / standby system using the 0-system control signal 17a and the 1-system control signal 18a. A system switching command is sent, and protection switching is determined according to the active / standby switching command information from the 0-system wavelength converter 2 and 1-system wavelength converter 3 and the switch factor occurrence notification, and 0-system wavelength conversion is performed. The system 2 and the 1-system wavelength conversion section 3 use the working system / standby system switching command received from the protection control unit 16 together with the switching factor occurrence notification as the working system / standby system switching command information. Since the signal 18b continues to be sent back to the protection control unit 16, no unnecessary switching occurs even if either the 0 system or the 1 system is the active system, Rotekushon controller hot-removal at the time of replacement, the effect is obtained that can be inserted.
[0021]
Embodiment 2. FIG.
In the first embodiment, the active / standby switching command is used for the 0-system control signal 17a and the 1-system control signal 18a, the switching factor occurrence notification and the active / standby switching are performed for the 0-system status signal 17b and the 1-system status signal 18b. Command information is sent, but CRC (“Cyclic Redundancy Check”) code may be added to them, and it is not necessary due to data removal during insertion or insertion of the protection control unit and wavelength conversion unit Therefore, it is possible to eliminate a data protection circuit for avoiding a serious switching and reduce a delay time.
[0022]
FIG. 2 is a block diagram showing the configuration of the wavelength division multiplexing transmission apparatus according to Embodiment 2 of the present invention, and specifically shows only the 0-system wavelength converter 2, the 1-system wavelength converter 3, and the protection controller 16. In FIG. 2A, 20a is a 0 system control signal, 20b is a 0 system state signal, 21a is a 1 system control signal, and 21b is a 1 system state signal.
[0023]
As shown in FIG. 2 (b), the 0-system control signal 20a and 1-system control signal 21a have an active / standby system switch command and CRC code, and the 0-system status signal 20b and 1-system status signal 21b have The switching factor occurrence notification, the active / standby switching command information, and the CRC code are transmitted, and the above-described delay time can be reduced. Note that BLANK in FIG. 2B is not necessarily required.
[0024]
As described above, according to the second embodiment, the protection control unit 16 adds a CRC code to the working / standby switching command, and the 0-system wavelength is determined by the 0-system control signal 20a and the 1-system control signal 21a. The 0-system wavelength converter 2 and the 1-system wavelength converter 3 send the switching factor occurrence notification, the active / standby system switch command information, and the CRC code to the 0-system state. Since the signal 20b and the 1-system state signal 21b are sent back to the protection control unit 16, the protection circuit for avoiding a data error during removal or insertion of the protection control unit 16 is eliminated, and the switching delay time can be reduced. Is obtained.
[0025]
Embodiment 3 FIG.
In the second embodiment, the switching factor occurrence notification, the active / standby switching command information, and the CRC code are sent to the 0-system status signal 20b and the 1-system status signal 21b. More than one type of code may be sent out, and when there is a failure in both systems, more detailed protection switching control can be performed.
[0026]
FIG. 3 is a block diagram showing a configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 3 of the present invention, and particularly shows only the 0-system wavelength converter 2, the 1-system wavelength converter 3, and the protection controller 16. In FIG. 3A, 22a is a 0-system control signal, 22b is a 0-system state signal, 23a is a 1-system control signal, and 23b is a 1-system state signal.
[0027]
As shown in FIG. 3B, the 0-system control signal 22a and the 1-system control signal 23a have an active / standby system switching command and a CRC code, and the 0-system status signal 22b and the 1-system status signal 23b have The switching factor occurrence notification 1, the switching factor occurrence notification 2, the active / standby switching command information, and the CRC code are transmitted. For example, when a plurality of channels are multiplexed in the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 and a failure of one channel occurs in the 0-system wavelength conversion unit 2, the 1-system wavelength conversion unit 3 is the active system, but if all channels fail in the 1-system wavelength conversion unit 3 after that, it is possible to switch back to the 0-system wavelength conversion unit 2. Note that BLANK in FIG. 3B is not necessarily required.
[0028]
As described above, according to the third embodiment, the 0-system wavelength conversion unit 2 and the 1-system wavelength conversion unit 3 have two or more switching factor occurrence notifications, working / standby system switching command information, and CRC codes. Are sent back to the protection control unit 16 by the 0-system state signal 22b and the 1-system state signal 23b, so that when the wavelength conversion unit multiplexes a plurality of channels, for example, the failure of one channel and the failure of all channels The effect that the protection switching with priority can be controlled can be obtained.
[0029]
【The invention's effect】
As described above, according to the present invention, the protection control means sends the active / standby switching command to the 0-system transmission means and the 1-system transmission means, and the active control from the 0-system transmission means and the 1-system transmission means. The protection switching is determined according to the system / standby system switch command information and the switching factor occurrence notification, and the 0-system transmission means and the 1-system transmission means receive the switching factor occurrence notification from the protection control means and the active / spare system Since the switching command is continuously sent back to the protection control means as the active / standby switching command information, the protection control unit does not cause unnecessary switching regardless of whether the 0 system or the 1 system is the active system. The effect that the hot wire removal and insertion at the time of replacement | exchange can be performed is acquired.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing a configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 2 of the present invention.
FIG. 3 is a block diagram showing a configuration of a wavelength division multiplexing transmission apparatus according to Embodiment 3 of the present invention.
FIG. 4 is a block diagram showing a configuration of a conventional wavelength division multiplexing transmission apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wavelength multiplexing transmission apparatus, 20 system wavelength conversion part 1-n (0 system transmission means), 3 1 system wavelength conversion part 1-n (1 system transmission means), 40 system optical multiplexing part (0 system transmission means) , 50 system optical demultiplexing unit (0 system transmission means), 6 system 1 optical multiplexing unit (1 system transmission means), 7 system 1 optical demultiplexing unit (1 system transmission means), 80 system optical amplification unit (system 0) Transmission system), 90 system optical amplification section (system 0 transmission means), 10 system 1 optical amplification section (system 1 transmission means), system 11 system optical amplification section (system 1 transmission means), system 120 transmission line, 13 0 system transmission path, 14 1 system transmission path, 15 1 system transmission path, 16 protection control unit (protection control means), 17a 0 system control signal, 17b 0 system status signal, 18a 1 system control signal, 18b 1 system status signal , 19 Optical coupler unit, 20a 0 system control signal, 20b 0 system status signal, 21a 1 system control signal, 21b 1 system status signal 22a 0 based control signals, 22b 0 system status signals, 23a 1 system control signals, 23b 1 system status signals.

Claims

Each wavelength light is optically multiplexed with 0-system wavelength multiplexed light and transmitted to the 0-system transmission path, and 0-system wavelength multiplexed light transmitted through the 0-system transmission path is optically demultiplexed into each wavelength light. System transmission means, and optically multiplexes each wavelength light into 1-system wavelength multiplexed light and sends it to the 1-system transmission path, and transmits the 1-system wavelength multiplexed light transmitted through the 1-system transmission path to each wavelength light. 1-system transmission means for optically demultiplexing, and the 0-system transmission means and the 1-system transmission means according to the presence / absence of a switch factor occurrence notification from the 0-system transmission means and the 1-system transmission means. In a wavelength division multiplexing transmission apparatus equipped with protection control means for switching protection of the system,
The protection control means sends an active / standby system switching command to the 0-system transmission means and the 1-system transmission means, and an active / standby system switching command from the 0-system transmission means and the 1-system transmission means. The protection switching is determined according to the information and the switching factor occurrence notification,
The 0-system transmission means and the 1-system transmission means, together with the switching factor occurrence notification, receive the working / protection system switching command received from the protection control means as working system / protection system switching command information to the protection control means. A wavelength division multiplexing transmission device characterized by continuing to send back.

The protection control means adds a CRC code to the active / standby switching command and sends it to the 0-system transmission means and the 1-system transmission means.
2. The wavelength division multiplexing transmission according to claim 1, wherein said 0-system transmission means and said 1-system transmission means send back a switching factor occurrence notification, active / standby system switching command information, and said CRC code to said protection control means. apparatus.

3. The wavelength transmission system according to claim 2, wherein the 0-system transmission means and the 1-system transmission means send back two or more switching factor occurrence notifications, working / standby system switching command information, and CRC codes to the protection control means. Multiplex transmission equipment.