JP4411135B2 - Transmitter / receiver for base unit of duplex PON system - Google Patents

Transmitter / receiver for base unit of duplex PON system Download PDF

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JP4411135B2
JP4411135B2 JP2004144022A JP2004144022A JP4411135B2 JP 4411135 B2 JP4411135 B2 JP 4411135B2 JP 2004144022 A JP2004144022 A JP 2004144022A JP 2004144022 A JP2004144022 A JP 2004144022A JP 4411135 B2 JP4411135 B2 JP 4411135B2
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政彦 岩切
和宏 内田
学 冨安
正道 笠
道彦 後藤
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Fujitsu Ltd
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Description

本発明は、局側終端装置の現用系及び予備系の各光加入者終端部が光加入者線及びスターカプラによる分岐を経て複数の加入者装置に接続され、複数の加入者装置と双方向伝送を行う、ＡＴＭ（Asynchronous Transfer Mode）−ＰＯＮ（Passive Optical Network）装置、Ｅ（Ether）ＰＯＮ装置などの光バースト信号多重伝送システムの二重化切替システムの親機側（局側）において用いられる送受信装置に関する。   In the present invention, the active and standby optical subscriber terminators of the station-side terminator are connected to a plurality of subscriber devices via a branch by an optical subscriber line and a star coupler, and bidirectionally communicate with the plurality of subscriber devices. Transmission / reception apparatus used on the master side (station side) of the duplex switching system of the optical burst signal multiplex transmission system such as ATM (Asynchronous Transfer Mode) -PON (Passive Optical Network) apparatus, E (Ether) PON apparatus, etc. About.

局側終端装置の光加入者終端部（親機）がスターカプラによる分岐を経て複数の加入者装置（子機）に接続され、複数の加入者装置と双方向伝送を行う光バースト信号多重伝送システムにおいて冗長構成をとる場合、スターカプラまでの距離が現用系と予備系とで異なるため、系切替時にはこの距離の違いを吸収する必要がある。そして、親機のバージョンアップ交換等の保守のために予備系に強制的に切り替える際には、サービスを中断することなく無瞬断で切り替え得ることが求められている。またこのようなシステムでは、システム立ち上げ当初から現用系と予備系が存在することを前提とするのでなく、運用中に必要に応じて予備系を追加して無瞬断で予備系に切り替えることが可能であることが求められている。また、子機が常に一定周期で受信し、受信タイミングが変わると異常と判定するシステムでは、系切替の際に子機の受信タイミングが変わらないようにしなければならない。   Optical burst signal multiplex transmission in which the optical subscriber termination unit (base unit) of the station side termination unit is connected to a plurality of subscriber units (slave units) via a branch by a star coupler, and performs bidirectional transmission with a plurality of subscriber units. When a redundant configuration is adopted in the system, since the distance to the star coupler differs between the active system and the standby system, it is necessary to absorb this difference in distance when switching the system. Then, when forcibly switching to a standby system for maintenance such as version upgrade replacement of the master unit, it is required that the service can be switched without interruption without interruption. Also, in such a system, it is not assumed that there is an active system and a standby system from the beginning of the system startup, but a standby system is added as needed during operation to switch to the standby system without interruption. Is required to be possible. Further, in a system in which a slave unit always receives at a constant cycle and determines that an abnormality occurs when the reception timing changes, the reception timing of the slave unit must not change during system switching.

特開平１０−３２２３８０号公報には、親局側装置と子局側装置のそれぞれで事前に０系と１系の受信遅延時間差を測定し、現用／予備切替の際には、子局側の受信タイミングを子局側で測定した遅延時間差で修正し、子局側の送信タイミングを親局側で測定された遅延時間差で修正することが記載されている。このシステムでは、システムの運用開始前に距離測定のために子局側で親局の予備系から受信する必要があり、運用中に予備系を追加して無瞬断で切り替えることはできない。   In Japanese Patent Laid-Open No. 10-322380, the difference in reception delay time between the 0-system and the 1-system is measured in advance in each of the master station side device and the slave station side device. It is described that the reception timing is corrected by the delay time difference measured on the slave station side, and the transmission timing on the slave station side is corrected by the delay time difference measured on the master station side. In this system, it is necessary to receive from the standby system of the master station on the slave station side for distance measurement before the start of operation of the system, and it is not possible to switch without interruption by adding a standby system during operation.

特開平８−３４０３０１号公報（特許第２９１０６６９号）には、切替時に距離測定用信号を局側の現用系から加入者側へ送り、その応答を予備系で受信することによって現用系と予備系の距離の差（位相差）を測定し、これに基いて局側で現用系から予備系へ切り替えると同時に加入者側装置の受信・送信位相の変更を行うことによって無瞬断で切り替えることが記載されている。しかしながらこの手法では切替時に子機の受信のタイミングが変わるので、子機が常に一定周期で受信する前述のシステムには適用することができない。   In JP-A-8-340301 (Japanese Patent No. 2910669), a distance measurement signal is sent from the active system on the station side to the subscriber side at the time of switching, and the response is received by the standby system, whereby the active system and the standby system are received. Measure the distance difference (phase difference) of the system, and switch from the active system to the standby system at the station side based on this, and at the same time, change the reception and transmission phase of the subscriber side device to switch without interruption Are listed. However, this method cannot be applied to the above-described system in which the slave unit always receives at a constant cycle because the reception timing of the slave unit changes at the time of switching.

特開平１１−８８３９４号公報には、現用／予備切替時の位相差の吸収を、親局側のタイミングの変更で実現することが記載されている。しかしながらこのシステムではシステム立ち上げ時に０系と１系が存在し、両系の遅延時間を測定してどちらか一方を現用系として選択することが前提であり、運用中に予備系を追加して強制切替するシステムにこの技術を適用することはできない。両系が完全に独立していないという点では、前述の特開平８−３４０３０１号公報もシステムも同様であり、前述したように切替前に距離測定用信号を局側の現用系から送出する必要がある。   Japanese Patent Application Laid-Open No. 11-88394 describes that phase difference absorption at the time of active / preliminary switching is realized by changing the timing on the master station side. However, in this system, system 0 and system 1 exist at the time of system startup, and it is assumed that one of them is selected as the active system by measuring the delay time of both systems, and a standby system is added during operation. This technology cannot be applied to a system that switches forcibly. The system is similar to the above-mentioned Japanese Patent Laid-Open No. 8-340301 in that both systems are not completely independent, and it is necessary to send a distance measurement signal from the working system on the station side before switching as described above. There is.

特開平１０−３２２３８０号公報JP-A-10-322380 特開平８−３４０３０１号公報（特許第２９１０６６９号）JP-A-8-340301 (Patent No. 2910669) 特開平１１−８８３９４号公報Japanese Patent Laid-Open No. 11-88394 特開２０００−３４９７９９号公報JP 2000-349799 A 特開２００３−１５２７５０号公報JP 2003-152750 A

したがって本発明の目的は、現用系と予備系が独立していて運用中に予備系を追加して予備系へ無瞬断で強制的に切り替えることが可能であり、切替えの前後で子機の受信タイミングが変化しない、２重化ＰＯＮシステムの親機用送受信装置を提供することにある。   Therefore, the object of the present invention is that the active system and the standby system are independent, and it is possible to forcibly switch to the standby system without any instantaneous interruption by adding the standby system during operation. An object of the present invention is to provide a transmission / reception device for a base unit of a duplex PON system in which reception timing does not change.

本発明によれば、予備系であるとき、子機までの距離の違いを吸収するための遅延指示値であって現用系において使用されている遅延指示値Ｔｄ０を受け取る手段と、予備系であるとき、現用系の受信基準Ｒ０に対する予備系における実際の受信位相Ｕ１の位相差ＰＤを測定する遅延測定部と、該遅延指示値Ｔｄ０と該位相差ＰＤとから、現用系になったときに用いる予定の送信基準Ｓ１、遅延指示値Ｔｄ１および受信基準Ｒ１を決定する遅延演算部とを具備する２重化ＰＯＮシステムの親機用の送受信装置が提供される。   According to the present invention, when the standby system is used, the standby system is a means for receiving the delay instruction value Td0 used in the active system, which is a delay instruction value for absorbing the difference in distance to the slave unit. The delay measuring unit that measures the phase difference PD of the actual reception phase U1 in the standby system with respect to the reception reference R0 of the active system, and the delay instruction value Td0 and the phase difference PD are used when the active system is established. There is provided a transmitting / receiving device for a master unit of a duplex PON system, which includes a scheduled transmission reference S1, a delay instruction value Td1, and a delay calculation unit for determining a reception reference R1.

図１は本発明の第１の実施形態に係る親機用の送受信装置の一例としての、光加入者終端部ＰＯＮＩＦ＃０，ＰＯＮＩＦ＃１が用いられているＰＯＮシステムの構成を示す。ＰＯＮＩＦ＃０とＰＯＮＩＦ＃１は互いに同一の構成を有しているので、それらの構成要素には同一の参照番号を付す。   FIG. 1 shows the configuration of a PON system in which optical subscriber termination units PONIF # 0 and PONIF # 1 are used as an example of a base transceiver device according to the first embodiment of the present invention. Since PONIF # 0 and PONIF # 1 have the same configuration, the same reference numerals are given to those components.

ＯＬＴは局側終端装置である。ＯＬＴ内のＰＯＮＩＦ＃０が現用系の光加入者終端部、ＰＯＮＩＦ＃１が予備系光加入者終端部であるものとする。ＯＮＵは加入者装置であり、ｎ：２スターカプラ１１を介して光ファイバにて最大ｎ台接続されている。光ファイバは等長とは限らない。   The OLT is a station side termination device. It is assumed that PONIF # 0 in the OLT is an active optical subscriber termination unit, and PONIF # 1 is a standby optical subscriber termination unit. An ONU is a subscriber unit, and is connected to a maximum of n units by optical fibers via n: 2 star couplers 11. Optical fibers are not necessarily equal in length.

図２は装置起動時に実施される各ＯＮＵまでの距離測定のシーケンスを示す。装置起動時、ＰＯＮＩＦ＃０の送信処理部１０にて距離測定パケットを生成し、光送信部１２より各ＯＮＵに対して距離測定パケットを送出する（図２（ｂ））。各ＯＮＵは光受信部１４にて距離測定パケットを受信し（図２（ｃ））、受信処理部１６にて自装置宛の距離測定パケットを認識すると、距離測定応答パケットを送信制御部１８を介して送信処理部２０へ送り、光送信部２２よりＯＬＴへ出力する（図２（ｄ））。   FIG. 2 shows a sequence of distance measurement to each ONU performed when the apparatus is started. When the apparatus is activated, a distance measurement packet is generated by the transmission processing unit 10 of PONIF # 0, and the distance measurement packet is transmitted from the optical transmission unit 12 to each ONU (FIG. 2B). Each ONU receives the distance measurement packet at the optical receiving unit 14 (FIG. 2C), and when the reception processing unit 16 recognizes the distance measurement packet addressed to itself, sends the distance measurement response packet to the transmission control unit 18. To the transmission processing unit 20 and output from the optical transmission unit 22 to the OLT (FIG. 2D).

ＰＯＮＩＦ＃０は光受信部２４で距離測定パケットを受信し（図２（ｆ））、受信処理部２６にて距離測定応答パケットを認識し、遅延測定部２８にて式（１）により遅延指示値Ｔｄ０を算出する。   In PONIF # 0, the optical receiver 24 receives the distance measurement packet (FIG. 2 (f)), the reception processor 26 recognizes the distance measurement response packet, and the delay measurement unit 28 uses the equation (1) to indicate a delay. The value Td0 is calculated.

Ｔｄ０＝Ｒ０−Ｓ０−２Ｄ０ （１）
ただし２Ｄ０は距離測定パケットを送信した後応答パケットを受信するまでに要した時間であり、受信基準と送信基準の時間差Ｒ０−Ｓ０は最も遠い距離にあるＯＮＵにおける２Ｄ０よりも長くなるように設定される。より詳細には、例えば、応答パケット受信タイミング（Ｓ０＋２Ｄ０）より遅延測定用カウンタを動作させ、受信基準位相Ｒ０でのカウンタ値を遅延指示値Ｔｄ０とする。 Td0 = R0-S0-2D0 (1)
However, 2D0 is the time required to receive the response packet after transmitting the distance measurement packet, and the time difference R0-S0 between the reception reference and the transmission reference is set to be longer than 2D0 in the ONU at the farthest distance. The More specifically, for example, the delay measurement counter is operated from the response packet reception timing (S0 + 2D0), and the counter value at the reception reference phase R0 is set as the delay instruction value Td0.

ＰＯＮＩＦ＃０は各ＯＮＵそれぞれに対して上り送出位相である遅延指示値Ｔｄ０を与える。図３に示すように、各ＯＮＵはＯＬＴからの受信（図３（ｃ））に応答して与えられた遅延指示値Ｔｄ０分の遅延を挿入したデータをＯＬＴへ送出することにより（図３（ｅ））、ＯＬＴにおける受信位相が各ＯＮＵで一致し（図３（ｆ））、各ＯＮＵからの上りデータの衝突が回避される。以後、受信処理部２６および遅延測定部２８は、温度変動等による伝送路長の変動を補正するため運用中に受信基準位相Ｒ０からの上りデータ位相のずれを常時監視して遅延指示値Ｔｄ０を補正し、例えば各下りフレームにおいて送り続ける。また、その目的は後述するが、図３（ｅ）に示すように、各ＯＮＵの送信処理部２０は与えられた遅延指示値Ｔｄ０を上りデータの例えば先頭領域に多重してＯＬＴへ返信する機能を持つようにしても良い。   PONIF # 0 gives a delay instruction value Td0 that is an upstream transmission phase to each ONU. As shown in FIG. 3, each ONU sends data inserted with a delay of the delay instruction value Td0 given in response to reception from the OLT (FIG. 3C) to the OLT (FIG. 3 ( e)), the reception phases in the OLT coincide with each ONU (FIG. 3 (f)), and collision of uplink data from each ONU is avoided. Thereafter, the reception processing unit 26 and the delay measuring unit 28 constantly monitor the shift of the upstream data phase from the reception reference phase R0 during operation to correct the transmission path length variation due to temperature variation or the like, and obtain the delay instruction value Td0. For example, correction is continued in each downstream frame. Although the purpose will be described later, as shown in FIG. 3E, the transmission processing unit 20 of each ONU multiplexes the given delay instruction value Td0 into, for example, the head area of the uplink data and returns it to the OLT. You may make it have.

予備系であるＰＯＮＩＦ＃１は各ＯＮＵからの上りデータを常時モニタし（図３（ｇ））、遅延測定部２８においてＯＬＴ受信基準位相Ｒ０と上り入力データ位相Ｕ１との位相差ＰＤを演算し、遅延演算部３０は系切替え後の下り送出位相Ｓ１と新遅延指示値Ｔｄ１（第１の手法）、または系切替え後の送出位相Ｓ１と新ＯＬＴ受信位相Ｒ１（第２の手法）を演算する。図１に示すように遅延指示値Ｔｄ０は例えばＰＯＮＩＦ＃０より装置内バスを介して通知される。   The standby system PONIF # 1 constantly monitors the upstream data from each ONU (FIG. 3 (g)), and the delay measurement unit 28 calculates the phase difference PD between the OLT reception reference phase R0 and the upstream input data phase U1. The delay calculation unit 30 calculates the downlink transmission phase S1 and the new delay instruction value Td1 (first method) after system switching, or the transmission phase S1 and the new OLT reception phase R1 (second method) after system switching. . As shown in FIG. 1, the delay instruction value Td0 is notified from the PONIF # 0 via the in-device bus, for example.

より詳細には、予備系の遅延測定部２８は、受信処理部２６にて検出したＯＮＵからの上りデータ先頭位相Ｕ１と受信基準位相Ｒ０との位相差を演算するために、図４および図５に示すように、基準位相Ｓ０を基準にタイミングカウンタを動作させ、受信基準位相におけるカウンタ値（Ｒ０）と、上りデータ先頭位置検出時のカウンタ値（Ｕ１）を抽出し、下記式（２）のように減算により位相差ＰＤを算出する。   More specifically, the standby delay measuring unit 28 calculates the phase difference between the upstream data head phase U1 from the ONU detected by the reception processing unit 26 and the reception reference phase R0, as shown in FIGS. As shown in FIG. 4, the timing counter is operated with reference to the reference phase S0, and the counter value (R0) at the reception reference phase and the counter value (U1) at the time of detecting the upstream data head position are extracted. Thus, the phase difference PD is calculated by subtraction.

ＰＤ＝Ｕ１−Ｒ０ （２）
図４の例はＯＬＴ〜ＯＮＵ間距離が現用系よりも予備系の方が長い場合、図５の例は現用系よりも予備系の方が短い場合を示す。 PD = U1-R0 (2)
The example in FIG. 4 shows the case where the distance between the OLT and the ONU is longer in the standby system than in the active system, and the example in FIG. 5 shows the case in which the standby system is shorter than the active system.

次に、遅延演算部３０は、位相差ＰＤを基に系切替え後の下り送出位相Ｓ１を演算する。系切替え前後においてＯＮＵの入力位相は一致している必要がある（フレーム位相が不連続であった場合、ＯＮＵにてフレーム同期外れ状態となり回線断が発生する）ため、下り送出位相を補正する。図６、図７に示すように、切替前のＰＯＮＩＦ＃０〜ＯＮＵ間遅延Ｄ０と切替後のＰＯＮＩＦ＃１〜ＯＮＵ間遅延Ｄ１との差（Ｄ１−Ｄ０）を補正すればよい。（Ｄ１−Ｄ０）はＰＤと等値であるので、系切替え後の下り出力位相は下記式（３）で求まる。   Next, the delay calculation unit 30 calculates the downlink transmission phase S1 after system switching based on the phase difference PD. The input phase of the ONU needs to match before and after system switching (if the frame phase is discontinuous, the ONU causes a frame synchronization loss and a line disconnection occurs), so the downstream transmission phase is corrected. As shown in FIGS. 6 and 7, the difference (D1−D0) between the PONIF # 0 to ONU delay D0 before switching and the PONIF # 1 to ONU delay D1 after switching may be corrected. Since (D1-D0) is equivalent to PD, the downstream output phase after system switching is obtained by the following equation (3).

Ｓ１＝Ｓ０−ＰＤ （３）
図６は送信基準をＳ０からＳ１に変更して切替え前後でＯＮＵの入力位相を不変にするとともに、遅延指示値Ｔｄ０をＴｄ１に変更してＯＬＴの受信基準をＲ０で不変にする例（第１の手法）を示す。この場合、現用系遅延測定部２８より入力する遅延指示値Ｔｄ０に対して、前述の位相差ＰＤによる補正を行い、切替え後の新遅延指示値Ｔｄ１とする。 S1 = S0-PD (3)
FIG. 6 shows an example in which the transmission reference is changed from S0 to S1 to make the ONU input phase unchanged before and after switching, and the delay instruction value Td0 is changed to Td1 to change the OLT reception reference to R0 unchanged (first). Method). In this case, the delay instruction value Td0 input from the active system delay measurement unit 28 is corrected by the above-described phase difference PD to obtain a new delay instruction value Td1 after switching.

図３と図６を比較して、送信基準Ｓ０〜受信基準Ｒ０の時間差は切替え前後で不変であるので、下記式（４）が成り立つ。   Comparing FIG. 3 and FIG. 6, the time difference between the transmission reference S0 and the reception reference R0 is unchanged before and after the switching, and the following equation (4) is established.

２Ｄ０＋Ｔｄ０＝Ｄ０＋Ｄ１＋Ｔｄ１ （４）
予備系の遅延演算部３０にて算出した位相差ＰＤは（Ｄ１−Ｄ０）と等値であるため、Ｄ１＝ＰＤ＋Ｄ０を式（４）に代入すると、下記式（５）のように変形でき、切替え後の新遅延指示値Ｔｄ１は式（６）で求まる。 2D0 + Td0 = D0 + D1 + Td1 (4)
Since the phase difference PD calculated by the standby delay calculation unit 30 is equivalent to (D1−D0), substituting D1 = PD + D0 into the equation (4) can be transformed into the following equation (5): The new delay instruction value Td1 after switching is obtained by Expression (6).

２Ｄ０＋Ｔｄ０＝Ｄ０＋ＰＤ＝Ｄ０＋Ｔｄ１ （５）
Ｔｄ１＝Ｔｄ０−ＰＤ （６）
遅延指示値は各ＯＮＵごとに異なる値であるが、補正は特定のＯＮＵについて求めたものと同じ値（ＰＤ）を用いてよい。 2D0 + Td0 = D0 + PD = D0 + Td1 (5)
Td1 = Td0-PD (6)
Although the delay instruction value is different for each ONU, the same value (PD) as that obtained for a specific ONU may be used for correction.

図７は、送信基準のＳ０からＳ１への変更とともに、遅延指示値については現用系のＴｄ０を引き継ぎ、受信基準をＲ０からＲ１へ変更する例（第２の手法）を示す。この場合、受信基準位相Ｒ０に対して前述の位相差ＰＤによる補正を行い、切替え後の新受信基準位相Ｒ１とする。このとき遅延指示値は切替え前の値Ｔｄ０を引き続き利用する。   FIG. 7 shows an example (second method) of changing the transmission reference from S0 to S1 and taking over the working Td0 for the delay instruction value and changing the reception reference from R0 to R1. In this case, the reception reference phase R0 is corrected by the above-described phase difference PD to obtain a new reception reference phase R1 after switching. At this time, the delay instruction value continues to use the value Td0 before switching.

図７からわかるように、切替え後の新受信基準位相Ｒ１は下記式（７）で表せる。   As can be seen from FIG. 7, the new reception reference phase R1 after switching can be expressed by the following equation (7).

Ｒ１＝Ｄ０＋Ｄ１＋Ｔｄ０ （７）
式（７）にＤ１＝ＰＤ＋Ｄ０を代入すると下記式（８）のように変形できる。 R1 = D0 + D1 + Td0 (7)
By substituting D1 = PD + D0 into the equation (7), it can be transformed as the following equation (8).

Ｒ１＝ＰＤ＋（２Ｄ０＋Ｔｄ０） （８）
（２Ｄ＋Ｔｄ０）は切替え前の受信基準Ｒ０であるので、Ｒ１は下記式（９）で求めることが出来る。 R1 = PD + (2D0 + Td0) (8)
Since (2D + Td0) is the reception reference R0 before switching, R1 can be obtained by the following equation (9).

Ｒ１＝Ｒ０＋ＰＤ （９）
系切替えは、切替え制御部３２よりＰＯＮＩＦ＃０，ＰＯＮＩＦ＃１の光送信部１２へ入力する切替え制御信号にて制御される。ＰＯＮＩＦ＃０，ＰＯＮＩＦ＃１へ入力する切替え信号はインバータ３６により互いに排他論理とし、変化のタイミングは基準位相（ＯＬＴ下り出力フレーム先頭）Ｓ１である。予備系光送信部は切替前は光出力シャットダウン状態である。 R1 = R0 + PD (9)
System switching is controlled by a switching control signal input from the switching control unit 32 to the optical transmission units 12 of PONIF # 0 and PONIF # 1. The switching signals input to PONIF # 0 and PONIF # 1 are mutually exclusive by the inverter 36, and the timing of the change is the reference phase (OLT downstream output frame head) S1. The standby optical transmitter is in an optical output shutdown state before switching.

系切替えにより、ＰＯＮＩＦ＃０の光送信部１２は光出力をシャットダウンし、予備系の光出力シャットダウンが解除される。同時にあらかじめ演算していた送出位相Ｓ１で、遅延指示値Ｔｄ１を新遅延指示値として各ＯＮＵへ送出する。又は予備系運用中に演算していたＯＬＴ受信位相Ｒ１を新ＯＬＴ受信位相として動作する。   By switching the system, the optical transmitter 12 of PONIF # 0 shuts down the optical output, and the standby optical output shutdown is released. At the same time, the delay instruction value Td1 is transmitted to each ONU as a new delay instruction value at the transmission phase S1 calculated in advance. Alternatively, the OLT reception phase R1 calculated during operation of the standby system operates as the new OLT reception phase.

下り送出位相、遅延指示値は切替え前にあらかじめ切替え後の値Ｓ１，Ｔｄ１に更新しておいてもよい。   The downlink transmission phase and the delay instruction value may be updated in advance to the values S1 and Td1 after switching before switching.

第２の手法における受信基準位相については、運用中上りデータ先頭位相と受信基準位相Ｒ０との位相差を常時演算し、温度変動等による伝送路長の変動を補正しつづける必要があるため、系切替え後にＲ１に更新する。   With respect to the reception reference phase in the second method, it is necessary to constantly calculate the phase difference between the upstream data start phase in operation and the reception reference phase R0, and to continue correcting the transmission path length variation due to temperature fluctuations. Update to R1 after switching.

光送信部のシャットダウン状態切替えタイミングを切替え後の下り送出位相Ｓ１とすれば、下りフレーム先頭の同期パターン、制御情報を間違いなく伝送可能であるため、ＯＮＵ側で異常検出することなく無瞬断切替え可能である。下りフレームの切替え直前の領域は未使用とする（図３，６，７の斜線部分）。   If the timing of switching the shutdown state of the optical transmitter is the downstream transmission phase S1 after switching, the synchronization pattern and control information at the beginning of the downstream frame can be transmitted without fail, so switching without interruption is detected without detecting any abnormality on the ONU side. Is possible. The area immediately before the switching of the downlink frame is unused (shaded portions in FIGS. 3, 6 and 7).

装置内側では、現用系、予備系それぞれから同一位相で出力するデータを、装置内フレーム先頭位置でセレクタ３４により切り替える。   On the inner side of the apparatus, data output in the same phase from each of the active system and the standby system is switched by the selector 34 at the frame start position in the apparatus.

ＯＮＵからの上りデータ領域には、ＯＮＵ＃１〜ｎの上り送出データが時分割多重されている。ＯＮＵからの上りデータ先頭位相Ｕ１と受信基準位相Ｒ０との位相差ＰＤ演算については、先願タイムスロットが割り当てられたＯＮＵが送出する上りフレームの先頭位相（＝Ｕ１）を用いればよい。位相差ＰＤは、現用ＯＬＴ〜カプラ間距離と予備ＯＬＴ〜カプラ間距離の差に依存し、カプラ〜各ＯＮＵ間の距離には依存しないためである。   In the upstream data area from the ONU, upstream transmission data of ONUs # 1 to n is time-division multiplexed. For the phase difference PD calculation between the upstream data head phase U1 from the ONU and the reception reference phase R0, the head phase (= U1) of the upstream frame transmitted by the ONU to which the prior application time slot is assigned may be used. This is because the phase difference PD depends on the difference between the working OLT-coupler distance and the spare OLT-coupler distance, and does not depend on the distance between the coupler and each ONU.

図８は、本発明の第２の実施形態に係るＰＯＮシステムの構成を示す。図１の構成において現用系の遅延指示値Ｔｄ０を装置内バスを介して予備系へ通知することに代えて、図８のシステムにおいては、各ＯＮＵにおいて上りデータに現在の遅延指示値Ｔｄ０を多重して通信し（例えば図３におけるフレーム先頭の網かけ部分）、それを予備系の受信処理部２６において抽出して遅延演算部３０へ渡す。   FIG. 8 shows a configuration of a PON system according to the second embodiment of the present invention. In the configuration shown in FIG. 1, instead of notifying the active system delay instruction value Td0 to the standby system via the in-device bus, the system shown in FIG. 8 multiplexes the current delay instruction value Td0 to the upstream data in each ONU. Communication (for example, the shaded portion at the head of the frame in FIG. 3), which is extracted by the standby reception processing unit 26 and passed to the delay calculation unit 30.

本発明の第１の実施形態に係る２重化ＰＯＮシステムの構成を示すブロック図である。1 is a block diagram showing a configuration of a duplex PON system according to a first embodiment of the present invention. 遅延指示値Ｔｄ０を算出する方法を説明するタイミングチャートである。It is a timing chart explaining the method of calculating delay instruction value Td0. 切替え前において予備系で行なわれる位相差ＰＤの算出を説明するタイミングチャートである。It is a timing chart explaining the calculation of the phase difference PD performed in the standby system before switching. 現用系距離＜予備系距離の場合の位相差ＰＤの算出を説明するタイミングチャートである。It is a timing chart explaining calculation of phase difference PD in case of working system distance <standby system distance. 現用系距離＞予備系距離の場合の位相差ＰＤの算出を説明するタイミングチャートである。It is a timing chart explaining calculation of phase difference PD in case of working system distance> standby system distance. 送信基準と遅延指示値を変更する例を示すタイミングチャートである。It is a timing chart which shows the example which changes a transmission reference | standard and a delay instruction value. 送信基準と受信基準を変更する例を示すタイミングチャートである。It is a timing chart which shows the example which changes a transmission standard and a reception standard. 本発明の第２の実施形態に係る２重化ＰＯＮシステムの構成を示すブロック図である。It is a block diagram which shows the structure of the double PON system which concerns on the 2nd Embodiment of this invention.

Claims (4)

２重化ＰＯＮ（Passive Optical Network）システムの親機側において用いる送受信装置であって、
予備系であるとき、子機までの距離の違いを吸収するための遅延指示値であって現用系において使用されている遅延指示値Ｔｄ０を受け取る手段と、
予備系であるとき、現用系の受信基準Ｒ０に対する予備系における実際の受信位相Ｕ１の位相差ＰＤを測定する遅延測定部と、
該遅延指示値Ｔｄ０と該位相差ＰＤとから、現用系になったときに用いる予定の送信基準Ｓ１、遅延指示値Ｔｄ１および受信基準Ｒ１を決定する遅延演算部とを具備する送受信装置。 A transmission / reception device used on the base side of a duplex PON (Passive Optical Network) system,
Means for receiving a delay instruction value Td0 used in the active system, which is a delay instruction value for absorbing a difference in distance to the slave unit when the standby system is used;
A delay measurement unit that measures the phase difference PD of the actual reception phase U1 in the standby system relative to the reception reference R0 of the active system when the standby system is the standby system;
A transmission / reception apparatus comprising: a delay calculation unit that determines a transmission reference S1, a delay instruction value Td1, and a reception reference R1 that are to be used when an active system is used from the delay instruction value Td0 and the phase difference PD. 前記遅延演算部は、現用系になったときに用いる予定の送信基準Ｓ１と遅延指示値Ｔｄ１として、現用系の送信基準Ｓ０と遅延指示値Ｔｄ０を位相差ＰＤによりそれぞれ変更したものを用い、受信基準Ｒ１として現用系の受信基準Ｒ０を引き継ぐ請求項１記載の送受信装置。   The delay calculation unit uses, as the transmission reference S1 and the delay instruction value Td1 that are scheduled to be used when the current system is used, the transmission reference S0 and the delay instruction value Td0 of the active system that are changed by the phase difference PD, respectively, The transmission / reception apparatus according to claim 1, wherein the reception standard R0 of the active system is taken over as the standard R1. 前記遅延演算部は、現用系になったときに用いる予定の送信基準Ｓ１と受信基準Ｒ１として、現用系の送信基準Ｓ０と受信基準Ｒ０を位相差ＰＤによりそれぞれ変更したものを用い、遅延指示値Ｔｄ１として現用系の遅延指示値Ｔｄ０を引き継ぐ請求項１記載の送受信装置。   The delay calculation unit uses, as the transmission reference S1 and the reception reference R1 that are scheduled to be used when the active system is used, the transmission reference S0 and the reception reference R0 of the active system that are changed by the phase difference PD, respectively. The transmission / reception apparatus according to claim 1, wherein the delay instruction value Td0 of the active system is taken over as Td1. 前記Ｔｄ０受け取り手段は、遅延指示値Ｔｄ０を子機から受け取る請求項１記載の送受信装置。   The transmission / reception apparatus according to claim 1, wherein the Td0 receiving unit receives a delay instruction value Td0 from a slave unit.
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