JPH0317258B2 - - Google Patents
Info
- Publication number
- JPH0317258B2 JPH0317258B2 JP59039350A JP3935084A JPH0317258B2 JP H0317258 B2 JPH0317258 B2 JP H0317258B2 JP 59039350 A JP59039350 A JP 59039350A JP 3935084 A JP3935084 A JP 3935084A JP H0317258 B2 JPH0317258 B2 JP H0317258B2
- Authority
- JP
- Japan
- Prior art keywords
- speed signal
- circuit
- low
- standby
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012544 monitoring process Methods 0.000 claims description 39
- 230000005540 biological transmission Effects 0.000 claims description 27
- 238000000926 separation method Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は、複数ｎ個のデイジタル送信低速信号
を１個のデイジタル送信高速信号に多重し、１個
のデイジタル受信高速信号を複数ｎ個の受信低速
信号に分離する多重分離装置の監視方式に関す
る。特に、この多重分離装置が複数ｍ個備えら
れ、その一つが現用装置として動作し、他の装置
は予備装置として待機させ、現用装置に異常があ
るときに、予備装置の一つを現用装置として接続
するように構成された多重分離装置の監視方式に
関する。Detailed Description of the Invention [Technical field to which the invention pertains] The present invention multiplexes a plurality of n digital transmission low-speed signals into one digital transmission high-speed signal, and multiplexes one digital reception high-speed signal into a plurality of n digital transmission high-speed signals. The present invention relates to a monitoring method for a demultiplexer that separates received low-speed signals. In particular, a plurality of m demultiplexing devices are provided, one of which operates as the active device, and the other devices are kept on standby as backup devices, so that when there is an abnormality in the active device, one of the backup devices is used as the active device. The present invention relates to a monitoring method for a demultiplexing device configured to be connected.
第１図は従来例方式のブロツク構成図である。
この方式では、回線１０にｎ個の送信低速信号が
入力し、これを多重化部２０で送信高速信号に多
重し、回線３０に送信する。また回線４０に到来
する受信高速信号は、分離部５０で受信低速信号
に分離され、回線６０にｎ個の受信低速信号とし
て送出される。しかも、各多重化部２０および分
離部５０はそれぞれ符号２０1，２０2，５０1，
５０2と表示されるように、ｍ重化（ここではｍ
＝２すなわち二重化）されていて、その一つが現
用装置として動作し、他は予備装置として待機す
るように構成されている。
FIG. 1 is a block diagram of a conventional system.
In this system, n low-speed transmission signals are input to the line 10, and the multiplexer 20 multiplexes these signals into a high-speed transmission signal, which is then transmitted to the line 30. Further, the high-speed reception signal arriving at the line 40 is separated into low-speed reception signals by the separating section 50, and sent to the line 60 as n low-speed reception signals. Moreover, each of the multiplexing section 20 and the demultiplexing section 50 has symbols 20 1 , 20 2 , 50 1 ,
50 2 , m-folding (here m
= 2, that is, duplex), one of which operates as an active device and the others stand by as standby devices.
この装置には監視部７０を備え、予備装置とし
て待機している装置について詳しい監視が行われ
るように構成されている。すなわち、この監視部
７０から回路９０に擬似低速信号を送出し、これ
を予備装置として待機している多重化部（第１図
では２０2）に与え、この出力高速信号を予備装
置として待機している分離部（第１図では５０2）
に折返し接続し、その分離部５０2の出力低速信
号を監視部７０に回路８０から取込み、回路９０
に送出した低速信号と回路８０に取込む低速信号
とを比較して、それが一致すれば予備装置として
待機する装置は正常な状態にあると判定してい
る。 This device includes a monitoring section 70 and is configured to perform detailed monitoring of devices that are on standby as standby devices. That is, a pseudo low-speed signal is sent from the monitoring section 70 to the circuit 90, and this is given to the multiplexing section (20 2 in FIG. 1) which is on standby as a standby device, and this output high-speed signal is sent on standby as a standby device. (50 2 in Figure 1)
The output low-speed signal of the separating section 502 is taken into the monitoring section 70 from the circuit 80,
The low speed signal sent to the circuit 80 is compared with the low speed signal taken into the circuit 80, and if they match, it is determined that the device waiting as a standby device is in a normal state.
しかし、この方式では予備装置として待機して
いる装置を擬似信号を通して判定することができ
るが、現用装置として動作している装置は擬似信
号を通すことはできないので、別の方法で良否の
判定を行つている。たとえば、各回路部分の電圧
電流あるいは信号のクロツク、レベルなどを監視
することになり、総合的な動作判定を行うことが
できない。 However, with this method, devices that are on standby as standby devices can be judged through pseudo signals, but devices operating as active devices cannot be passed through pseudo signals, so pass/fail judgments can be made using another method. I'm going. For example, the voltage and current of each circuit part or the signal clock, level, etc. must be monitored, making it impossible to make a comprehensive judgment on the operation.
本発明は、これを改良するもので、予備装置と
して待機する装置だけでなく、現用装置について
も総合的な良否判定を実行することができる監視
方式を提供することを目的とする。
The present invention improves on this, and aims to provide a monitoring method that can perform comprehensive quality judgment not only on devices that are on standby as standby devices, but also on active devices.
本発明は、現用装置の多重回路の入力送信低速
信号を分岐する第一の手段と、その現用装置の多
重回路の出力送信高速信号を分岐する第二の手段
と、この第二の手段により分岐された送信高速信
号を予備装置として待機している分離回路に選択
的に接続する第三の手段と、この分離回路の出力
低速信号を上記入力送信低速信号と比較する第四
の手段と、上記現用装置の分離回路の入力受信高
速信号を分岐する第五の手段と、この第五の手段
により分岐された受信高速信号を上記予備装置と
して待機している分離回路に選択的に接続する第
六の手段と、上記現用装置の分離回路の出力受信
低速信号を分岐する第七の手段と、この第七の手
段により分岐された出力受信低速信号と上記第六
の手段により接続された予備装置の出力低速信号
とを比較する第八の手段とを備え、動作中の現用
装置についても、総合的な良否判定を行うように
構成されたことを特徴とする。
The present invention provides a first means for branching an input transmission low-speed signal of a multiplex circuit of an active device, a second means for branching an output transmission high-speed signal of a multiplex circuit of the current device, and a branching method by the second means. third means for selectively connecting the transmitted high-speed signal to a standby separation circuit as a standby device; fourth means for comparing the output low-speed signal of the separation circuit with the input transmission low-speed signal; a fifth means for branching the input received high-speed signal of the separation circuit of the active device; and a sixth means for selectively connecting the received high-speed signal branched by the fifth means to the separation circuit on standby as the backup device. a seventh means for branching the output reception low-speed signal of the separation circuit of the active device; and a seventh means for branching the output reception low-speed signal branched by the seventh means and the backup device connected by the sixth means. and an eighth means for comparing the output low-speed signal with the output low-speed signal, and is characterized in that it is configured to perform a comprehensive quality determination even for the current device in operation.
本発明の実施例について図面を参照して説明す
る。
Embodiments of the present invention will be described with reference to the drawings.
第２図は本発明一実施例多重分離装置の監視方
式のブロツク構成図である。第２図において、第
１図と同一の部分は同一の符号で示す。図外装置
よりｎ個の入力送信低速信号が回線１０を介して
多重化部２０内の選択回路２１に入力される。選
択回路２１から選択されたｎ個の低速信号が多重
回路２２に接続される。多重回路２２から多重化
された回線３０がスイツチ２３の共通接点に接続
され、スイツチ２３の一方の切換接点から送信高
速信号が回線３０を介して図外装置に送出され
る。また、図外装置から受信高速信号が回線４０
に到来し、分離部５０内のスイツチ５１の一方の
切換接点に接続される。上記スイツチ２３，５１
の他の切換接点は相互に接続される。分離回路５
３から分離されたｎ個の低速信号が選択回路５４
に接続される。選択回路５４から受信低速信号が
選択され回線６０を介して図外装置に出力され
る。また、監視部７０内の比較回路７１に、選択
回路５４から回路８０に受信監視低速信号が選択
されて接続される。低速信号発生回路７２から送
信監視用低速信号が回路９０を介して選択回路２
１および比較回路７１に接続される。比較回路７
１から予備の多重化部２０と予備の分離部５０と
の動作が正常かどうかを調べその結果が制御回路
７３に入力される。制御回路７３はバス１００を
介して多重化部２０および分離部５０に接続さ
れ、多重化部２０および分離部５０からの障害情
報が制御回路７３に入力されて現用または予備の
決定がなされ、また制御回路７３から多重化部２
０および分離部５０の制御回路２１，５４および
スイツチ２１，５１等に選択信号が出力される。 FIG. 2 is a block diagram of a monitoring system of a demultiplexing apparatus according to an embodiment of the present invention. In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals. n input transmission low-speed signals are input from a device not shown in the figure to the selection circuit 21 in the multiplexing section 20 via the line 10. The n low-speed signals selected from the selection circuit 21 are connected to the multiplex circuit 22. A line 30 multiplexed from the multiplex circuit 22 is connected to a common contact of a switch 23, and a high-speed transmission signal is sent from one switching contact of the switch 23 via the line 30 to a device not shown. Also, a high-speed signal received from a device not shown is connected to line 40.
and is connected to one switching contact of the switch 51 in the separating section 50. The above switch 23, 51
The other switching contacts of are interconnected. Separation circuit 5
n low speed signals separated from 3 are selected by the selection circuit 54.
connected to. A received low-speed signal is selected from the selection circuit 54 and outputted via the line 60 to a device not shown. Further, the reception monitoring low-speed signal is selected and connected to the comparison circuit 71 in the monitoring section 70 from the selection circuit 54 to the circuit 80 . A low-speed signal for transmission monitoring is sent from the low-speed signal generation circuit 72 to the selection circuit 2 via the circuit 90.
1 and comparison circuit 71. Comparison circuit 7
1, it is checked whether the operations of the spare multiplexer 20 and the spare demultiplexer 50 are normal, and the results are input to the control circuit 73. The control circuit 73 is connected to the multiplexing unit 20 and the demultiplexing unit 50 via the bus 100, and fault information from the multiplexing unit 20 and the demultiplexing unit 50 is input to the control circuit 73 to determine whether it is currently in use or as a backup. From the control circuit 73 to the multiplexer 2
A selection signal is output to the control circuits 21, 54, switches 21, 51, etc. of the separation section 50.
ここで、本発明の特徴とするところは、以下に
述べるところにある。すなわち、多重化部２０内
に選択回路２４を設け、選択回路２１からのｎ個
の低速信号を順番に１個ずつ選択し、回路１１０
を介して現用送信監視低速信号として監視部７０
に接続する。 Here, the features of the present invention are as described below. That is, the selection circuit 24 is provided in the multiplexing section 20, and the n low-speed signals from the selection circuit 21 are sequentially selected one by one.
The monitoring unit 70 as a low-speed signal for monitoring active transmission via
Connect to.
また、分離部５０に選択回路５２を設け、多重
回路２２から回路１４０を介して与えられる現用
送信監視高速信号と、回路１５０から与えられる
他の分離部５０内のスイツチ５１の共通接点から
の現用受信監視高速信号と自分離部５０内のスイ
ツチ５１の共通接点からの送信高速信号とのいず
れかを選択して１個の高速信号とし、これを分離
回路５３に出力する。 Further, a selection circuit 52 is provided in the separation section 50, and the current transmission monitoring high-speed signal given from the multiplexing circuit 22 via the circuit 140 and the current use transmission monitoring high-speed signal given from the circuit 150 from the common contact of the switch 51 in the other separation section 50 are selected. Either the reception monitoring high-speed signal or the transmission high-speed signal from the common contact of the switch 51 in the remote section 50 is selected and made into one high-speed signal, which is output to the separation circuit 53.
また、分離部５０に選択回路５５を設け、選択
回路５４からのｎ個の低速信号を選択し、現用の
選択回路５５は現用受信監視低速信号として回路
１２０に、予備の選択回路５５は予備受信監視低
速信号または予備送信監視低速信号として回路１
３０に送出し、これを監視部７０に接続する。 Further, a selection circuit 55 is provided in the separation unit 50, and selects n low-speed signals from the selection circuit 54. Circuit 1 as monitoring low speed signal or preliminary transmission monitoring low speed signal
30 and connects it to the monitoring section 70.
さらに、監視部７０に比較回路７４を設け、選
択回路２４からの現用送信監視低速信号１１０と
予備の選択回路５５からの予備送信監視低速信号
１３０とを比較して現用の多重化部２０と予備の
分離部５０との動作が正常かどうかを調べ、また
現用の選択回路５５からの現用受信監視低速信号
１２０と予備の選択回路５５からの予備受信監視
低速信号１３０とを比較して、現用の分離部５０
と予備の分離部５０との動作が正常かどうかを調
べ、その結果を制御回路７３に出力する制御回路
７３からバス１００を介して多重回路２２および
選択回路２４，５２，５５等に制御信号が出力さ
れる。 Furthermore, a comparison circuit 74 is provided in the monitoring unit 70, and the current transmission monitoring low-speed signal 110 from the selection circuit 24 and the backup transmission monitoring low-speed signal 130 from the backup selection circuit 55 are compared, and the current multiplexing unit 20 and the backup transmission monitoring low-speed signal 130 are compared. The current reception monitoring low-speed signal 120 from the current selection circuit 55 and the backup reception monitoring low-speed signal 130 from the backup selection circuit 55 are compared to check whether the operation with the separating unit 50 is normal. Separation section 50
Control signals are sent from the control circuit 73 to the multiplex circuit 22 and the selection circuits 24, 52, 55, etc. via the bus 100. Output.
このような構成の多重分離装置の監視方式の動
作について説明する。第２図において、いま多重
部２０1および分離部５０1を現用とし、多重部２
０2および分離部５０2を予備として説明する。本
発明の動作監視は三つのステツプからなり、第一
のステツプは予備の多重化部２０2と分離部５０2
の動作監視で方式的には従来例の方式と同じであ
るため、説明を省く。第二のステツプは現用の多
重化部２０1の選択回路２４1で選択される現用送
信監視低速信号１１０と、予備の分離部５０2に
送られてくる現用に多重化部２０1からの現用送
信監視高速信号１４０を分離した予備送信監視低
速信号１３０とを比較する。第三のステツプは現
用、予備の両方の分離部５０1，５０2からの現用
受信監視低速信号１２０と受信高速信号４０を分
離した予備受信監視低速信号１３０とを比較す
る。 The operation of the monitoring method of the multiplexing/demultiplexing device having such a configuration will be explained. In FIG. 2, the multiplexing section 20 1 and the separating section 50 1 are currently in use, and the multiplexing section 2
0 2 and separation unit 50 2 will be explained as a backup. The operation monitoring of the present invention consists of three steps .
Since the method for monitoring the operation is the same as the conventional method, the explanation will be omitted. The second step is to select the current transmission monitoring low-speed signal 110 selected by the selection circuit 24 1 of the current multiplexer 20 1 and the current signal from the multiplexer 20 1 to be sent to the backup separation unit 50 2 . The transmission monitoring high speed signal 140 is compared with the separated preliminary transmission monitoring low speed signal 130. The third step is to compare the working reception monitoring low speed signal 120 from both the working and standby separating sections 50 1 and 50 2 with the backup reception monitoring low speed signal 130 obtained by separating the reception high speed signal 40 .
以上の三ステツプで動作監視を行い、第一のス
テツプで予備の多重化部２０2と分離部５０2を監
視するが、第一のステツプで誤りを検出した場合
には、現用の多重化部２０1、または分離部５０1
に障害が発生しても予備への切換えは監視部７０
の制御信号１００により禁止される。第二のステ
ツプおよび第三のステツプで誤りが検出されれ
ば、自動的に予備側に切換えられる。 The operation is monitored in the above three steps, and the first step is to monitor the spare multiplexer 202 and demultiplexer 502. However, if an error is detected in the first step, the current multiplexer is 20 1 or separation section 50 1
Even if a failure occurs, the monitoring unit 70 switches to the backup
control signal 100. If an error is detected in the second and third steps, a switch is automatically made to the standby side.
以上は多重化部および分離部が各二個あり二重
化された実施例について説明したが、多重化部お
よび分離部が複数個で多重化された場合でもよ
い。 Although the embodiment has been described above in which there are two multiplexing sections and two demultiplexing sections and duplication is performed, a case where a plurality of multiplexing sections and a plurality of demultiplexing sections are multiplexed may be used.
本発明は、以上説明したように、現用の多重化
部で多重化された高速信号を予備の分離部に折返
し、多重化される低速信号と分離された低速信号
とを比較し、また現用の分離部に入力する受信高
速信号を予備の分離部にも入力し両方の分離部で
分離された低速信号を比較することにより、予備
の多重化部および分離部の動作監視に加え現用の
多重化部および分離部の動作監視も行うので、多
重化部および分離部に設けられている障害監視回
路で検出できない障害も検出することができ、総
合的な良否判定を実行できる優れた効果がある。
したがつて、予備への切換えも確実に行われ、多
重分離装置および回線の高信頼度を確保できる利
点がある。
As explained above, the present invention returns the high-speed signal multiplexed by the current multiplexing section to the standby separation section, compares the multiplexed low-speed signal and the separated low-speed signal, and By inputting the received high-speed signal that is input to the demultiplexer into the backup demultiplexer and comparing the low-speed signals separated by both demultiplexers, the operation of the backup multiplexer and demultiplexer can be monitored as well as the current multiplexer. Since the operation of the multiplexing section and the separating section is also monitored, it is possible to detect failures that cannot be detected by the fault monitoring circuits provided in the multiplexing section and the separating section, and there is an excellent effect that comprehensive quality judgment can be performed.
Therefore, switching to the standby mode is performed reliably, and there is an advantage that high reliability of the demultiplexing device and the line can be ensured.
第１図は従来例の多重分離装置の監視方式のブ
ロツク構成図。第２図は本発明一実施例多重分離
装置の監視方式のブロツク構成図。
１０，３０，４０，６０……回線、２０……多
重化部、２１，２４，５４，５５……選択回路、
２２……多重回路、２３，５１……スイツチ、５
０……分離部、５３……分離回路、７０……監視
部、７１，７４……比較回路、７２……低速信号
発生回路、７３……制御回路、８０，９０，１１
０，１２０，１３０……回路、１００……バス。
FIG. 1 is a block diagram of a conventional monitoring system for a demultiplexing device. FIG. 2 is a block diagram of a monitoring system of a demultiplexing apparatus according to an embodiment of the present invention. 10, 30, 40, 60... line, 20... multiplexing section, 21, 24, 54, 55... selection circuit,
22...Multiple circuit, 23, 51...Switch, 5
0... Separation section, 53... Separation circuit, 70... Monitoring section, 71, 74... Comparison circuit, 72... Low speed signal generation circuit, 73... Control circuit, 80, 90, 11
0, 120, 130...circuit, 100...bus.
Claims (1)
号に多重する多重回路と、 １個の受信高速信号を複数ｎ個の受信低速信号
に分離する分離回路と がそれぞれ複数ｍ個備えられ、 この複数ｍ個の多重回路および分離回路の各一
つが現用装置として各信号回線に接続され、その
現用装置以外の多重回路および分離回路は予備装
置として待機するように接続制御する手段を備
え、 上記予備装置として待機している多重回路に低
速信号を印加する手段と、この手段により低速信
号を印加している多重回路の出力高速信号を上記
予備装置として待機している分離回路に接続する
手段と、この手段により接続された分離回路の出
力低速信号を上記低速信号と比較する手段とを備
えた多重分離装置の監視方式において、 上記現用装置の多重回路の入力送信低速信号を
選択して分岐する第一の手段と、 上記現用装置の多重回路の出力送信高速信号を
分岐する第二の手段と、 この第二の手段により分岐された送信高速信号
を上記予備装置として待機している分離回路に選
択的に接続する第三の手段と、 この分離回路の出力低速信号を上記現用装置か
ら分岐された入力送信低速信号と比較する第四の
手段と、 上記現用装置の分離回路の入力受信高速信号を
分岐する第五の手段と、 上記第五の手段により分岐された受信高速信号
を上記予備装置として待機している分離回路に選
択的に接続する第六の手段と、 上記現用装置の分離回路の出力受信低速信号を
選択して分岐する第七の手段と、 この第七の手段により上記現用装置から分岐さ
れた出力受信低速信号と上記第六の手段により接
続された予備装置の出力低速信号とを比較する第
八の手段と を備えたことを特徴とする多重分離装置の監視方
式。[Claims] 1. A multiplexing circuit that multiplexes a plurality of n transmission low-speed signals into one transmission high-speed signal, and a separation circuit that separates one reception high-speed signal into a plurality of reception low-speed signals. A plurality of m multiplex circuits and demultiplexing circuits are provided, and each one of the m multiplex circuits and demultiplexing circuits is connected to each signal line as an active device, and connection control is performed so that the multiplex circuits and demultiplexing circuits other than the current device are on standby as standby devices. means for applying a low-speed signal to the multiplex circuit on standby as the standby device; and a means for separating the output high-speed signal of the multiplex circuit to which the low-speed signal is applied by the means to the multiplex circuit on standby as the standby device. In a monitoring system for a demultiplexing device comprising means for connecting to a circuit and means for comparing an output low speed signal of a demultiplexing circuit connected by the means with said low speed signal, the input transmitted low speed signal of said multiplex circuit of said working device a first means for selecting and branching the output transmission high-speed signal of the multiplex circuit of the active device; and a second means for branching the output transmission high-speed signal of the multiplex circuit of the active device, and a standby transmission high-speed signal branched by the second means as the backup device. a third means for selectively connecting to an isolating circuit that is connected to a separator; fourth means for comparing an output low speed signal of the separator circuit with an input transmitting low speed signal branched from the active device; and separating the active device. a fifth means for branching the received high-speed signal input to the circuit; and a sixth means for selectively connecting the received high-speed signal branched by the fifth means to the separation circuit waiting as the backup device; a seventh means for selecting and branching the output reception low speed signal of the separation circuit of the current device; and a seventh means connecting the output reception low speed signal branched from the current device by the seventh means. and eighth means for comparing the output low-speed signal of the standby device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3935084A JPS60182832A (en) | 1984-02-29 | 1984-02-29 | Supervisory system of multiplex separating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3935084A JPS60182832A (en) | 1984-02-29 | 1984-02-29 | Supervisory system of multiplex separating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60182832A JPS60182832A (en) | 1985-09-18 |
| JPH0317258B2 true JPH0317258B2 (en) | 1991-03-07 |
Family
ID=12550626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3935084A Granted JPS60182832A (en) | 1984-02-29 | 1984-02-29 | Supervisory system of multiplex separating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60182832A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2833849B2 (en) * | 1990-09-28 | 1998-12-09 | 日本電気株式会社 | Backup circuit self-monitoring device |
| JP6066388B1 (en) | 2015-11-26 | 2017-01-25 | 富士フイルム株式会社 | Radiation irradiation equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58212238A (en) * | 1982-06-02 | 1983-12-09 | Nec Corp | Automatic switching system of multiplex converter system |
-
1984
- 1984-02-29 JP JP3935084A patent/JPS60182832A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58212238A (en) * | 1982-06-02 | 1983-12-09 | Nec Corp | Automatic switching system of multiplex converter system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60182832A (en) | 1985-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2826907B2 (en) | Signal protection and monitoring system | |
| US4601028A (en) | Method of and apparatus for checking datapath failure in a communication muldem | |
| US5345438A (en) | Transmission device capable of readily controlling active and backup sections | |
| US4993013A (en) | Monitor system for multiplex equipment | |
| JPH0330336B2 (en) | ||
| JP2500743B2 (en) | Digital cross connect device | |
| US20020097462A1 (en) | Optical transmission device and optical transmission system | |
| JPH0317258B2 (en) | ||
| JP2737639B2 (en) | Transmission line switching control system | |
| JPS61295800A (en) | Remote station control system | |
| CA2076996C (en) | Transmission line switching devices capable of switching to a redundant system when a failure occurs in the system path | |
| US6856767B2 (en) | Optical signal quality selection system | |
| US5473597A (en) | Test circuit of multiplex equipment | |
| JPH0710061B2 (en) | Demultiplexing circuit | |
| JP2550896B2 (en) | Fault diagnosis device | |
| JP3013007B2 (en) | Line switching method | |
| JP2793233B2 (en) | Circuit diagnosis method for digital multiplexer | |
| JP2503908B2 (en) | Line switching control circuit | |
| JPH05260026A (en) | Automatic line bypass device | |
| JP2507609B2 (en) | ISDN subscriber interface equipment | |
| JPH0316331A (en) | Data link protection system | |
| JPS59131254A (en) | Fault detecting system | |
| JPS6148249A (en) | Line switching device | |
| JP2000004187A (en) | Transmission line switching system | |
| JPH1041965A (en) | Vehicle-use multiplex communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |